Prehistoric human impact on the environment in the upland North American Southwest

Some early Anasazi (prehistoric Puebloan) agricultural practices tended to be land-extensive and made substantial impact on the forests, primarily through clearing by burning. Later agriculture tended to be more land-intensive, but longer duration occupations by larger populations also had significant local effects on the forests, through both clearing for fields and through intensive harvest of firewood. Strategies of early Anasazi agriculture that resulted in forest depletion probably also tended to maximize the power output of the economic systems, and therefore must have had considerable selective value. Depletion of various wild resources was an important impetus to culture change, leading, in conjunction with population growth, to more intensive farming practices, and contributing to the tendency to aggregate in large villages at various times in the prehistoric period.     

The influence of human fertility on the economic conditions of the rural population in poland

Summary In 1970, Polish women in agricultural households reported larger numbers of children born alive than women in other occupations. When controlling for the influence of age at marriage and duration of marriage, the average number of children born per women among the farming population increased directly with the amount of privately owned agricultural land. Consistently, women whose principal source of livelihood was derived from non-agricultural sources even though they resided in villages, showed lower fertility than those in the agricultural sector, but significantly higher fertility than city women. This study is based on the five per cent sample of ever-married women between 15 and 70 years of age interviewed about their past reproductive histories in Poland during the 1970 Census of Population.The conclusions identify the high level of human fertility in rural populations as the main determinant of economic status among Polish peasants whose sources of support derive primarily from farming. Additional evidence supporting the hypothesis of dependence of the agricultural economy on the force of human reproduction is based on data for Slovakia and the Czech regions.     

Preliminary discussion on the current over-population in agriculture in China]

The population devoted to agriculture constitutes more than 80% of China's total population. This high percentage is not very common in today's world. In the last 30 years, the population devoted to agriculture has increased by 81.9%, but the area of arable land has decreased in the same period of time. This situation has created problems, such as a surplus of agricultural labor, an imbalance between the agricultural population growth and agricultural means of production, a serious contradiction between the agricultural population growth and mechanization of agriculture, an imbalance between the agricultural population growth and means of livelihood, and the current low standard of living for populations engaged in agricultural work. In order to solve the problems of overpopulation, various measures must be taken in different places. The economic structure of agriculture is to be reasonably arranged, and various operations in agriculture are to be carried out. In addition to the production of main agricultural crops, forestry, animal husbandry, the fishing industry, and family supplementary income are to be developed in order to provide more job opportunities. Communes and production teams should emphasize labor intensive plans for more profit with less investment. Agriculture should focus on intensive farming in order to increase productivity. Arable land can be expanded with reclamation projects, and water and soil conservation is necessary. The surplus agricultural population should be utilized for productive activities.     

Population and resources

Rapid growth of the world's population is recent. World food production has increased in close proportion. No one can say when or in what fashion population growth will end; whether by our deliberate choice, or by catastrophe, or by some limit of the Earth.In the United States, during a century and a half of rapid growth, farming has diminished from being the major economic activity to an almost trivial fraction. At the same time, farm production has increased many-fold. One result is that the American public spends a smaller portion of its income on food than, probably, has any society in human history. Not all of the world has shared in this agricultural revolution and, once in recent decades, and now again, evidence suggests food production may fail to increase with population. Certainly no guarantee can be offered that food production will always be adequate.Pessimism on the outcome is warranted if only because of profound disagreement among those who should be best informed. Many look only to the near future and persistently advocate growth. Only a few look to the long-run and the inescapable disasters of persistent growth.Presented at the symposium on Population and Scarcity: The Forgotten Dimensions.     

Apocalypse when? Population growth and food supply in South Asia

Food demands for staple grains are expected to almost double over the next 25 years in South Asia, due to population growth and increased standards of living. Trends in the mid-1990s suggest that neither pessimism nor optimism prevails in the region. There is wide diversity among and within countries. Trends suggest that population densities are already the highest in the world, and the amount of arable land is declining. Urban growth has moved onto farm land and farmers have been pushed onto more marginal lands or have become landless. Land intensification has produced mixed results. Cereal production per capita has increased since the 1950s in India, with about 75% of the region's population, but Pakistan's increases were not sustained into the 1980s. Average daily caloric intake per person in the region of 2214 is below the level in Sub-Saharan Africa. In Bangladesh, levels are particularly worrisome at 2037. The environmental impact has not been easily quantified, but experts have suggested that pressure on farm land has contributed to loss of soil fertility and water resource loss. Further intensification of farming is feasible, but difficult and more expensive than in the past. Regardless of production problems and solutions, there is also the very real problem of poor food distribution and lack of purchasing power. Farm management skills must be utilized, if environmental degradation is to be avoided. There is the added unknown of what climate changes will occur and how agricultural production will be affected. The policy implications are that increased food production must be made a political priority. Policies must support agricultural research into improved technologies and support distribution of technological advances to a wider number of farmers. Rural infrastructures such as roads, market outlets, and credit agencies must be established. Policies must be removed that disadvantage farmers, such as inappropriate subsidies for irrigation water, inadequate tenure agreements, and price setting. Slowing population growth provides time to adjust to expanding production and saving the environment.     

A brief analysis of population pressure on agricultural production under the new situation]

China's agricultural industry is currently undergoing a gradual transition from its previously restrictive self-sufficient natural economy to a more commercialized system of production. This transition has already effected an increase in China's agricultural productivity. Moreover, efforts toward planned population growth have made significant headway in China's rural areas. With all these changes, the large, unskilled Chinese farm family is currently facing mounting economic troubles as the new system of commercialized farming now rewards the technically skilled and economically efficient farmer. The problems facing many large farm families in China's north central province of Shaanxi are discussed, as well as the deficiencies of the system of farmland apportionment which awards farmland according to family size, instead of family capital resources and productivity.     

Equalizing population denominators for australian metropolitan areas

Most population data are collected and tabulated in an aggregate form by censuses around the world in which political and economic considerations determine the geographic unit of the aggregation. Large spatial variation in population size among, units can limit comparative analysis among different subregions. Census population counts are often used as the denominator in rate calculations. This paper proposes the design of new districts for Australian metropolitan areas that will decrease the absolute range in population among districts. The transport algorithm is used for aggregation of Collection Districts in order to achieve this goal. The transport algorithm proved efficient in assigning CDs to a more equitable alignment of population in the selected Statistical Divisions. This method affords the spatial comparison of city settlement and socio-economic variables as well as deriving a stable denominator for these comparisons. The results demonstrate the advantages of equalized population denominators over those associated with the current statistical districts.     

Agricultural settlement and soil quality in the Brazilian Amazon

This paper discusses the implications of poor or non-existent information on soil quality, at the proper scale, during the planning and implementation of settlement projects in the Brazilian Amazon. Based on data from the Machadinho settlement project, Rond?nia, we show that most settlers had no knowledge about the agricultural capability of the area, did not receive technical information, could not afford agricultural inputs, planted inadequate crops in the early years of occupation, and did not manage to stay in their plot for a long period of time. Satellite images indicated that patches of land with good soil quality were not necessarily the first to be utilized. Inadequately planned settlements face many challenges (poor soil being one of them) and are likely to result in land turnover, conversion of land into pasture, land concentration among wealthier persons, invasion of areas by poorer people, and deforestation, defying the main purpose of agrarian reform.     

农珠三角农业流动人口“代耕农”的社会生态——基于惠州博罗石湾李岗村代耕农部落的调研

“代耕农”是珠三角地区农业流动人口中的特殊群体,对当地经济社会发展有一定贡献。但其在代耕过程中引发系列社会问题。影响社会快速和健康发展。通过对惠州市博罗县石湾镇李岗村代耕农抽样调查资料的统计分析,从频率、方式、内容等方面描述珠三角代耕农生产与生活的社会生态,希望社会及政府部门关注“代耕农”,认识其问题的严重性,并制定相关政策积极解决。     

Survey and analysis of family planning work at Xindian Brigade]

Through personal interviews, it was found that the success of family planning at Xindan Brigade can be attributed in part to the Brigade party's contribution to family planning education, with the party members acting as family planning models. Moreover, economic objectives are used to secure the results desired. Devoted members are recruited to promote family planning, while economic rewards and restrictions reinforce planning goals. Family planning work in the village of Sung Chuang was reasserted in late 1983 with party leaders acting as family planning models. The results were significant and in 1984, 18 out of 24 brigades fulfilled projected goals by 100% with the average for the entire Sung Chung village being 98.5%. A single-child family rate was obtained in 12 brigades with the average rate in the village for single-child families being 95.9% overall. It is thought that the role of agricultural production must be correctly analyzed and family planning modified to adjust to the "new" type of farming village. Furthermore, a long-lasting contradiction must be forseen between the viewpoints of these 2 sectors of society (i.e., agricultural and political). The policy of the party will be to implement the program and to correctly handle any objections or problems that may arise. Finally, collective management methods must be adopted by the authorities in order to effectively control population growth, especially that seen in the farming village.     

Metropolitan Influence and Land Use Competition in Potential Biomass Crop Production: A Spatial Demographic Analysis

Biomass is one alternative energy source that is currently being investigated to combat the growing U.S. dependence on foreign oil. In this study, we explore where traditional farming practices and metropolitan influence will compete for land use against farmland located in optimal biomass crop production zones. To date, no consideration of the impact of urbanization and human development has been taken into account. Here we make a take a seminal approach to examining this relationship given previous analyses. We use overlapping LISA statistics to identify significant clusters of counties facing competition for land use. To measure competition for land use in counties located within biomass zones circa 2000, we use population growth and housing data from Census Bureau estimates, farmland data from the Census of Agriculture, and remotely sensed land use/cover data from the United States Geological Survey. The implications of these factors and how they will potentially affect biomass crop production are discussed.     

The influence of the farm size on the parity of a farming family in Poland

This paper aims at statistical identification of the relationship between the parity of farming families and the area of the farm and the role this variable plays among variables describing the model of families' parity. To reach this objective results of a questionnaire survey were used, one performed among the group of individual farmers' families keeping agricultural accounting in 1985. The analysis covered 1291 rural farming couples who married in the years 1920-1984. According to the results obtained, the thesis posed by W. Stys with regard to positive relationships between parity in a family and the farm's area only relates to marriages entered into between 1920-1964. In single five-year marriage cohorts, a change of shape of this relationship was observed. It took the shape of a parabolic function or polynomial of the third order. The research results showed that in marriage cohorts with finished fertility, variable area of the farm turned out to be almost insignificant in explaining changes in the number of live born children compared to other demographic factors, especially cultural and demographic ones.     

Demographic and socio-economic situation in a new settlement in Sri Lanka: a study of System C of the Mahaweli Development Programme

"The accelerated Mahaweli Development Programme is one of the most recent and largest multi-purpose development programmes in Sri Lanka, and System C is a major agricultural settlement that has been developed under this programme.... This paper presents the findings of a study that was carried out in System C, with a view to collecting certain important baseline demographic and socioeconomic characteristics." Information is provided on spatial distribution, number and size of families, sex ratio, age distribution, family characteristics, and seasonal variations in population.     

Toward a New Conceptualization of Settlements for Demography

It has long been recognized that where people live and work can be a relevant factor in helping to explain demographic behavior, yet the treatment of location in censuses and surveys remains surprisingly crude. Emphasis is still being given to the urban–rural dichotomy based on definitions that most countries around the world introduced 40 to 50 years ago and have modified little since. Given the increase in the complexity of settlement systems in recent decades in less developed as well as in more developed contexts, this simple classification is no longer adequate for examining the role of settlement in demographic processes. The time has come to rethink how settlement should be differentiated in population data collection and analysis. Contemporary technologies and methodologies make it possible to analyze spatially referenced data in ways that are more rapid and sophisticated than could have been imagined when the conventional approach was devised.     

‘Agricultural Poverty’ and the Expansion of Artisanal Mining in Sub-Saharan Africa: Experiences from Southwest Mali and Southeast Ghana

Why do people engage in artisanal and small-scale mining (ASM)—labour-intensive mineral extraction and processing activity—across sub-Saharan Africa? This paper argues that ‘agricultural poverty’, or hardship induced by an over-dependency on farming for survival, has fuelled the recent rapid expansion of ASM operations throughout the region. The diminished viability of smallholder farming in an era of globalization and overreliance on rain-fed crop production restricted by seasonality has led hundreds of thousands of rural African families to ‘branch out’ into ASM, a move made to secure supplementary incomes. Experiences from Komana West in Southwest Mali and East Akim District in Southeast Ghana are drawn upon to illustrate how a movement into the ASM economy has impacted farm families, economically, in many rural stretches of sub-Saharan Africa.     

The population problems in the countryside of China from the viewpoint of ecological economy]

There is a very close relationship between the population and the economy. The economy is the foundation for the existence and development of the population. Different socioeconomic patterns will determine population rules and population development, they have a strong influence on the social economy and the development of the entire society, and they may control the pace of social and economic development. In the last 30 years, excessive population growth has caused a great many difficulties for Socialist construction, overburdened agriculture, and created an imbalance in agricultural ecology. In order to understand the relationship between the development of the agricultural population and agricultural production, we have to understand to dominant position held by people in an agricultural ecology system. People have to control their own reproduction and match it with the productivity of the agricultural ecology system. Unrestrained population growth in the countryside is the main reason for an imbalance in China's agricultural ecology. Urgent action is needed to control the population growth in the rural areas, to fully utilized the available labor force, to promote the level of agricultural productivity, and to provide more employment opportunities. The final goal is to match China's huge agricultural human resources with its rich resources. investment should be encouraged to increase the wisdom and quality of the agricultural population. Both the quality and quantity of the agricultural labor force should also match development of agricultural productivity. In this way, a normal condition of agricultural ecology may be maintained.     

Life Style Or Survival Strategy?

At the beginning of the 1990s, less than a half-percent of the Czech agricultural work force were private farmers having persisted through the period of forced collectivization. This tiny social group did not play an economically or socially significant role in Czech society. In the agricultural sector, privatization of the Czech economy after 1989 meant restitution of land to the original owners. State and co-operative farms were transformed either to joint enterprises, i.e. owner-run co-operatives, or to private farms. Initially, there was no great interest in private farming. However, employment opportunities in rural areas are limited. Today, private farmers comprise about 20% of the agricultural work force. Over half of them (54%) have less than one hectare arable land and private farming is not their main source of work income. The rest of the private farmers have different types of holdings ranging from 1 ha to well over 1000 ha. The average size of private holdings of this category is about 32 ha. Return to private farming means a large change of life style for both farmers and their families. Hard competition on the market is reflected in their attitudes and opinions. Of course, life cannot be reduced to solely the economic dimension. Freedom, personal independence, and decision-making responsibility appear as new major life values. Nevertheless, close interdependency of economic and social conditions is strongly felt. This contribution summarizes results of empirical research based on 385 Czech private farmers. Survey participants evaluated positive and negative effects of changes subsequent to 1989 on their economic and social life.     

A Quantitative Investigation of the Population-Land Inequality-Land Clearance Nexus

This paper provides a quantitative investigation of the population-land inequality-land clearance nexus. Drawing on the literature on farmer optimization behaviour, the study formalizes and empirically tests a model of population-induced agricultural land clearance. The model makes several assumptions about this process: (a) The rate at which agricultural land is brought into production due to rising population pressures accelerates with the level of inequality in access to land, (b) Egalitarian systems have a greater capacity to absorb rising numbers of people per unit of land area and, thus, will have lower rates of agricultural land clearance than higher ones and (c) Irrespective of its degree of egalitarianism, the capacity of any system to hold people in one place will eventually break down once a critical population threshold is reached. Due to their lower population absorptive capacity, this level will be reached sooner under unequal systems of land distribution. Thus, the model also hypothesizes that the stimulatory impact of population growth on the demand for new land will exhibit a non-linear threshold pattern. For the farmer, the decision to clear a new plot of land will reflect these population-inequality interactions: Earnings from farming in settled areas will tend to fall as population densities and inequality in access to land increase. Time series results confirm that rural population growth is a significant factor driving agricultural land clearance in many of the 59 developing countries of our sample. Results also suggest that this rate of clearance is largest in countries with highly inegalitarian patterns of distribution. In contrast, cross-sectional regression results do not suggest any direct role for land inequality in population-agricultural land use outcomes. Contrary to the models assumption that this relationship should follow a non-linear threshold pattern, cross-sectional results also find no evidence that the absorptive capacity of highly densely populated land systems has been reached on average. However, they do provide support for an indirect linear relationship: Population induced agricultural land clearance is significantly magnified as inequality in access to land increases. Drawing on the empirics of the growth-inequality literature, the study suggests that this magnifying role may be linked to inequalitys impact on the assets of the poor. That is, by undermining the capacity of the rural poor to make productive investments in the land base, inequality in land distribution mediates population pressures in a way that affects both the quality and quantity of assets available to the poor to raise incomes, invest in skills accumulation, and spur demand in the rural economy as a whole.     

The environment as a determinant of child mortality among migrants in frontier areas of Pará and RondÔnia, Brazil, 1980

This article examines child mortality as an indicator of the quality of life among migrants living in Brazilian Amazonia in 1980. I focus on migrants in the frontier states of Pará and RondÔnia, which experienced rapid settlement during the 1970s. The key question here is the effect of settlement location on child mortality rates. While RondÔnia had lower ratios of population per public health establishments and personnel than Pará, RondÔnia nonetheless exhibited a higher malaria prevalence in 1980. I therefore attribute locational differences in child mortality to environmental factors important to malaria transmission rather than to health care infrastructure. The findings from multivariate regression analysis show that net of the effects of human capital, migration history and migrant living standards, settling in Pará rather than RondÔnia resulted in significantly lower rates of child mortality. These findings suggest that environmental factors coinciding with location of frontier settlement had important consequences for the living standards of migrants in the Brazilian Amazon.