不同渗调剂对茄子种子的渗调效应研究

茄子种子用不同浓度的聚乙烯醇、水杨酸、硝酸钙、硝酸钾、琼脂药剂处理后，种子的发芽活力明显提高，在对各发芽指标的影响上，以种子发芽势最为明显，平均提高114．8％；各渗调剂的处理效果以硝酸钾最好；其中水杨酸渗调处理对膜的修复重建作用最好。     

聚乙烯醇形成土壤水稳性团粒的效果研究

研究了在3种土壤氢离子浓度（10000nmol·L-1、361．2、10μmol·L-1、2种温度（10℃、30℃）下，不同浓度的聚乙烯醇（PVA）形成土壤水稳性团粒的效果。研究了PVA对土壤水分散失量以及酸性～弱酸性土壤氢离子浓度的影响。结果表明：0.01％～0.1％PVA能有效地形成土壤水稳性团拉；1％PVA在上述2种温度、3种氢离子浓度条件下成团效果尤为明显。另外，PVA能减少土壤水分的散失量和增加酸性～弱酸性土壤的氢离子浓度值。     

Illegal killing slows population recovery of a re-introduced raptor of high conservation concern - The red kite Milvus milvus

The re-introduction of extirpated species is a valuable conservation tool. Red kites Milvus milvus are declining over much of their European range and have been re-introduced to England and Scotland, following their extinction due to widespread human persecution during the 19th century. Considerable regional variation in population growth exists. This study aims to identify the proximate demographic and ultimate environmental constraints on red kites in north Scotland, a region with low population growth. Productivity in north Scotland was high compared to other Scottish and Welsh populations and equal to English populations with high population growth rates. In north Scotland, annual survival of wild-fledged birds was low for first-year birds compared to other Scottish populations and second-year survival declined over time. In north Scotland, 40% of 103 red kites found dead were killed illegally, mainly by direct poisoning. In the absence of illegal killing, we estimate that annual survival rates in wild red kites might increase from 0.37 to 0.54, 0.72 to 0.78 and 0.87 to 0.92 for first, second-year and adult birds respectively. Demographic rates from this study produce population trends that recapitulate observed trends for the north Scotland population (leading to a population of c40 pairs by 2006). Models in which the additive illegal killing mortality is excluded, predict a population trajectory and size (c300 pairs by 2006) very similar to that found in the Chilterns, a rapidly growing population (320 pairs in 2006) in south-east England re-introduced at the same time, but where rates of illegal killing are much lower. We conclude that illegal killing of red kites is the cause of poor population growth in north Scotland and the key challenge facing government is to find a way to eliminate this killing.     

聚乙烯醇渗调对烟草种子活力及芽期酶活性的影响

研究了聚乙烯醇(PVA)渗调处理烟草种子后种子活力及生理生化的变化,并筛选出PVA处理的最佳浓度和时间。结果表明,烟草种子经2％～6％的PVA渗调处理1～5d后,发芽率和种子活力均有所提高,出苗时间缩短,种子浸出液的相对电导率大幅度下降,过氧化物酶和酸性磷酸酯酶活性均显著提高,其中以4％和6％浓度PVA处理烟草种子3d,效率最好。