高山姬鼠种群繁殖参数的变化

对1996-2008年贵州省大方县高山姬鼠种群繁殖参数的变化规律研究结果表明,高山姬鼠种群繁殖具有明显的季节周期性波动,主要繁殖期在4～9月,一年中在春季4～5月和秋季8～9月出现2次妊娠高峰期。研究期间共解剖标本1080只, 雌鼠556只,雄鼠524只,种群性比为1.06,10年平均怀孕率为20.63%,平均胎仔数为5.92只,平均繁殖指数为0.67,平均睾丸下降率为72.05%,雄鼠睾丸下降率季节变化与雌鼠怀孕率季节变化呈同步变动趋势。不同年度、不同月份、不同季节种群繁殖参数存在一定差异。不同年龄组之间种群繁殖参数存在显著差异,随着种群年龄的增长,种群繁殖力不断增加。种群繁殖参数具有明显的地理差异。     

The ethnic geography of New Zealand: A decade of growth and change, 1991–2001

Abstract: New Zealand's population growth of 10 per cent over the decade 1991–2001 resulted substantially from an increasing number of those claiming Pacific Island and Asian ethnicity, and to a lesser extent of the New Zealand Maori. Using census data for a comparable set of small areas with average populations of just over 100, this paper examines the changing geography of the four main ethnic categories – New Zealand European, New Zealand Maori, Pacific Island Peoples, and Asians – across the country as a whole and in its major settlements, especially Auckland. There is little extreme segregation of the three minority groups, but most of the Europeans live in areas where there is little exposure to those of other ethnicities. Most of the changes in segregation reflect the growth of Auckland's Pacific Island and, especially, Asian populations.     

Sustainable fisheries management in the resource periphery: The cases of Chile and New Zealand

Abstract: Chile and New Zealand both depend on their natural resource bases for their exports. This situation characterises the historical condition of the resource periphery. Despite similar processes of globalisation in their fisheries sectors since the 1970s, the ways in which public and private policies and management strategies have been brought to bear on sustaining the resource base differ considerably. In light of the strategic economic agreement between the two countries (and Singapore and Brunei) signed in 2005, these contrasts reveal that multiple options exist for countries in the resource periphery to enhance their national development by working with comparative advantages alongside competitive advantages introduced into the sector. Chile’s explosive growth in aquaculture and its low levels of public and private concern for more sustainable fisheries is contrasted with New Zealand’s more sustainable approach to natural resource management through a range of instruments and commitments. The principal conclusion is that resource periphery producers should capitalise on their natural assets, but only within the context of a sustainable strategy that promotes and enforces responsibility. The current crisis in global capture fisheries is both an opportunity and a warning in this regard.     

栽培桃与野生桃果实发育中山梨醇含量及其相关酶活性的变化

试验研究桃果实发育过程中,山梨醇含量及其相关酶活性的变化规律,探究其与裂核现象的可能关系。以栽培桃‘久保’和野生桃为试验材料,测定桃果实不同发育时期中果皮和内果皮的山梨醇含量以及与山梨醇代谢相关酶--山梨醇脱氢酶(SDH)和山梨醇氧化酶(SOX)活性的变化。在果实发育的第1个时期,‘久保’中果皮山梨醇含量整体趋势高于野生桃,SDH和SOX的活性低于野生桃,说明在幼果生长期,‘久保’中果皮内的山梨醇代谢较野生桃弱。在果实发育的第2个时期,对比‘久保’与野生桃内果皮,‘久保’的山梨醇含量高于野生桃,SDH的活性低于野生桃,说明在桃果实硬核期,野生桃内有较强的山梨醇代谢活性,从而有利于果糖的形成,为桃果核的木质化提供能量来源。在果实发育的第3个时期, ‘久保’中果皮内的山梨醇含量比野生桃要上升的快,表明‘久保’果实可能更多地利用外源糖供给,促进果实的迅速膨大。     

棉花超高产群体质量与产量关系研究

试验结果表明，皮棉产量在１８７５ｋｇ．ｈｍ￣（－２）以上时，必须保持较高的群体质量。其中果节量为２２５～３２２．５万个·ｈｍ￣（－２），富照期成铃强度在２１６００个·ｈｍ￣（－２）·日以上，晚秋桃形成期成铃强度在１０９８２．７个，ｈｍ￣（－２）·日以上。株型较紧凑，最大ＬＡＩ在３．８７～４．４５范围内，成熟期（９月１５日）ＬＡＩ保持在２．３５～２．５７，叶铃比３．５５～４．１１：１，叶面积载铃量在３２个·ｍ￣（－２）叶以上。