浙江省毛竹(Phyllostachys Pubescens)林和茶(Camellia sinensis)园土壤碳库的研究

采用重铬酸钾-浓硫酸容量法,研究了中亚热带东部毛竹(Phyllostachys pubescens)林和茶(Camellia sinensis)园土壤有机碳储量,得出毛竹林和茶园土壤有机碳含量分别为224.6、92.2t/hm2;进一步估算出浙江省毛竹林和茶园土壤有机碳储量为9.94×107、4.67×107t.     

基于耕地粮食生产潜力的驻马店市粮食生产核心区建设研究

通过对1999—2008年驻马店市与河南省的粮食产量的对比分析,从耕地粮食生产潜力的视角,采用谢庭生的粮食预澍模型,对驻马店市2010年及2020年粮食产量进行了预测,进而估算了驻马店市耕地承载盈亏,最后结合驻马店市实际,提出了具有可操作性的驻马店市粮食生产核心区建设的对策建议。     

Slave Ships and Coffin Ships: Transatlantic Exchanges in Irish-American Blackface Minstrelsy

Abstract

Irish participation in blackface minstrelsy underwent complex transatlantic exchanges as it jumped from the US to Ireland and back again from the era of the Great Famine through the end of the nineteenth century. Most research on Irish-American blackface minstrelsy treats the Irish in America as a homogenous group that used ‘blacking up’ to establish its ethnic whiteness. However, there were at least two distinct groups of Irish Americans who participated in blackface minstrelsy: Irish Catholics and Irish Protestants. The latter’s incorporation into the history of minstrelsy means that we must reconsider assumptions about how and why the Irish performed blackface in both Ireland and America. Because Irish Protestants’ whiteness was never in question, theories of ethnic assimilation and working class anxieties do not adequately account for Irish gravitation to minstrel shows. Something else about Irish identity captivated performers and audiences. Moving beyond the racial assimilation mode, I argue that blacking up carried tensions of land dispossession, national identity, and ethnic conflict in Ireland into American culture.     

内战前美国南部商业经济的落后性及其原因

内战前 ,美国南部的商业经济从总体上看较为落后 ,主要原因在于 :南部内地市场狭小 ,商业资本缺乏 ;南部的城市没有担负起促进商业发展的重担 ;南方人的保守倾向和重农抑商观念抑制了商业经济的发展。     

元谋干热河谷退化坡地立体种养生态农业模式建设

根据元谋干热河谷生态环境脆弱、水分短缺、干热资源充足等特点,按照生态学、生态经济学、系统科学的原理设计规划干热河谷退化坡地立体种养复合生态农业模式,即“乔 灌 草 羊 沼气 蚯蚓 鸡”模式。经多年实践证明,所建的典型优化模式综合效益明显,其中:系统净产值为4.22万元/a.hm2,成本产值率164%,能量转化率为960%,饲料转化率为264.92%,土壤理化形状明显改善,土壤蓄水量增加106 t/hm2,使系统得以可持续发展,该模式在干热河谷有广泛的推广前景。