Soil-atmosphere exchange of carbon dioxide,methane and nitrous oxide in urban garden systems: impact of irrigation,fertiliser and mulch

Urban green spaces provide important ecosystem services, such as amenity, biodiversity, productivity, climate amelioration, hydrological and biogeochemical cycling. Intensively managed urban gardens can sequester carbon through vegetation growth and soil C increase, but may experience nitrous oxide (N₂O) emissions and reduced soil methane (CH₄) uptake from irrigation and fertiliser use. Soil atmosphere exchange of N₂O, CH₄ and carbon dioxide (CO₂) was measured in lawn and wood chip mulched garden areas in Melbourne, Australia in winter, spring and summer under various water and fertiliser regimes. Gas exchange before and after lawn fertiliser application was measured continuously for three weeks using an automated chamber system. Applying fertiliser led to a peak N₂O emission of >60 μg N m⁻² h⁻¹, but overall only weekly irrigation (10 mm) significantly increased mean soil N₂O emissions above that in other treatments. Under mulch, mean soil N₂O emissions (14.0 μg N m⁻² h⁻¹) were significantly smaller than from irrigated lawn (27.9 μg N m⁻² h⁻¹), whereas mean soil CH₄ uptake under mulch (−30.7 μg C m⁻² h⁻¹) was significantly greater (p < 0.01) than in any lawn treatment. Lawns were either a weak CH₄ sink or source. Soil C density (0–25 cm) under mulch (12.5 kg C m⁻²) was greater that under lawn (8.0 kg C m⁻²). On a carbon dioxide equivalent (CO₂-e) basis, soil N₂O emissions offset the benefits of soil CH₄ uptake. Mulched garden areas provide greatest C sequestration potential in soil and vegetation and the smallest non-CO₂ emissions, as soil CH₄ uptake offsets a large fraction of soil N₂O emissions. Results of this study suggest that reducing the irrigation and fertiliser application to lawns can help mitigate GHG emissions from urban garden systems, and increasing the area of mulched perennial garden beds can also provide net GHG benefits; however, this needs to be tested in other garden systems with different soil types and environmental conditions.     

用于研究细胞入侵的基质降解实验

在细胞正常发育、发炎和肿瘤转移研究中有一个关键步骤,就是通过多层的细胞外基质入侵细胞。在传统的研究方法中,研究者们已经发展了自己的检测方法,就是利用荧光标记的凝胶来研究基质降解,其中伴随着细胞的入侵。这篇文章探索了研究细胞入侵的新方法,能得到比传统方法更一致的结果。研究者们利用这些方法来研究降解时间过程,扫描在降解过程中潜在的活化剂或者抑制剂,探索细胞入侵的通道。     

New Labour, Work and the Family

New Labour has put support for the family at the core of its notion of the “strong community”. Across a range of policy areas the Labour government can be seen to be developing a direct and explicit family policy. But what kind of community is the government trying to shape by these policies? On the one hand, Labour appears to support the family as the basis of a more moral, dutiful and cohesive community. On the other hand, the government has given weight to policies that support social inclusion in the community through paid work. This paper examines whether there is a tension in Labour’s social policies between its emphasis on the importance of stable family life and the primacy given to paid work. Are critics like Ruth Levitas right when they argue that the government’s emphasis on paid work devalues, and is unsupportive of, unpaid work, especially caring for children and other family members? Alternatively, can this combination of communitarianisms—community as “stable family” and community as “paid work”—be seen to be marking out some “third way” on the family? We shall show that different aspects of the government’s family policies reflect different perspectives and policy agendas within New Labour and third‐way thinking more broadly. And while recognizing the tensions between work and the family, we shall suggest that they are often overstated and fail to give sufficient weight to the complementary aspects of Labour’s welfare reforms.     

Toward an Optimal Asset Allocation for Charitable Remainder Trusts

Economic theory, relevant research, and a Monte Carlo model are used to develop investment guidelines for charitable remainder unitrusts (CRUTs). Investment for CRUTs should involve a significant share of equities, with as much as 70 percent allocated to equities for long‐term CRUTs. Adjusting allocations as payout beneficiaries get older is unnecessary given the nature of CRUTs, donors, and simulated outcomes. The authors propose that a fixed asset allocation be used instead of one that changes over time and that CRUTs with higher payouts should use a more aggressive asset allocation (more equities).     

Britain and Globalization

Many perspectives on globalization see it as differentiated in its effects and reception, culturally driven, either pre-modern or postmodern, best captured by globalist or sceptical perspectives, and an equalizing phenomenon. This article discusses the British experience of globalization in the light of such approaches and argues that looking at this case gives an alternative view. Six themes on globalization are explored across four areas of the British experience of globalization. It is argued that in Britain globalization is, in contrast to the approaches outlined above, differentiated but also generalizing, economically driven, modern, best understood with a mix of globalist and sceptical perspectives and structured by power, inequality, and conflict. It is also argued that the British experience of globalization is a specific one and that Britain is a very globalized and globalizing country, economically, culturally, and politically.     

On Confidence Intervals for Process Capability Indices in a One-Way Random Model

In this article, we investigated the bootstrap calibrated generalized confidence limits for process capability indices C _pk for the one-way random effect model. Also, we derived Bissell's approximation formula for the lower confidence limit using Satterthwaite's method and calculated its coverage probabilities and expected values. Then we compared it with standard bootstrap (SB) method and generalized confidence interval method. The simulation results indicate that the confidence limit obtained offers satisfactory coverage probabilities. The proposed method is illustrated with the help of simulation studies and data sets.     

Ties That Bind: Public Foundations in Dyadic Partnerships

VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - Public Ancillary Funds (PubAFs) are grantmaking philanthropic foundations, largely held to be independent. However, some...     

Training perceptions,engagement, and performance: comparing work engagement and personal role engagement

The purpose of this study was to compare two engagement constructs (work engagement and personal role engagement) with regard to their relationship with training perceptions and work role performance behaviours. It was hypothesised that personal role engagement would show incremental validity above that of work engagement at predicting work role performance behaviours and be a stronger mediator of the relationships between training perceptions and such behaviours. Questionnaire data were gathered from 304 full-time working adults in the UK. As predicted, personal role engagement was found to explain additional variance above that of work engagement for task proficiency, task adaptability, and task proactivity behaviours. Moreover, personal role engagement was a stronger mediator of the relationship between training perceptions and task proficiency as well as between training perceptions and task adaptability. Both work engagement and personal role engagement mediated the relationship between training perceptions and task proactivity to a similar degree. The findings suggest that personal role engagement has better practical utility to the human resource development domain than work engagement and indicates that future research may benefit from adopting the personal role engagement construct.     

Strategic interaction sequences: the institutionalization of participatory budgeting in New York City

ABSTRACT

An interactive approach to social movements highlights time dynamics in ways more correlational approaches do not, in that interaction and outcomes unfold in sequences as players react to one another. Some aspects of these engagements are shaped by institutional schedules, while others leave discretion to the players. Some institutional schedules, meanwhile, may be reshaped by strategic interactions. By examining the implicit trade-offs and explicit dilemmas that pervade strategic interaction, we see how some are tightly linked to time whereas others more closely reflect ongoing structural situations. Analyzing the case of participatory budgeting in New York City, we focus on two trade-offs, ‘being there’ and ‘powerful allies’, that appear when social movements attempt to institutionalize new policies and processes. These time-based strategic trade-offs complicate activists’ efforts to secure lasting gains.