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漫溢干扰过程中微地形对幼苗定居的影响/Effects of the microhabitats on the seedling emergence during the flooding disturbance[J]
Authors
中国科学院新疆生态与地理研究所,乌鲁木齐,830011
中国科学院新疆生态与地理研究所,乌鲁木齐830011
+9 more
中国科学院研究生院,北京100049
史小丽
叶茂
安红燕
徐海量
新疆师范大学地理科学与旅游学院,乌鲁木齐,830054
武威沙漠公园,武威733000
禹朴家
龚君君
Publication date
1 January 2013
Publisher
Abstract
通过对比漫溢干扰后边坡、坡中和坡底幼苗的物种组成、密度、幼苗周边的环境条件及土壤种子库的差异来分析漫溢干扰过程中,微地形对幼苗定居的影响.结果表明:(1)微地形对幼苗物种组成和生物多样性指数的影响很大.漫溢干扰后,位于边坡、坡中和坡底幼苗的Simpson多样性指数和Mcintosh均匀度指数在0.01的水平上差异极显著,Margalef丰富度指数在0.05的水平上差异显著.(2)微地形对土壤盐分含量影响很大.方差分析的结果表明,除HCO3-和K+外,边坡、坡中和坡底的pH值、C023-、SO24-、Ca2+和Mg2+各指标在0.01的水平上差异极显著;全盐、总盐、Cl-和Na+各指标均在0.05的水平上差异显著.(3)微地形通过改变幼苗定居的环境条件,进而影响幼苗库的物种组成、密度和生物多样性指数.微地形中,幼苗库的各种生态指标均小于对应的土壤种子库的生态指标,从坡底到坡中到边坡,除单位面积上的植被密度外,土壤种子库和幼苗库的各项生态指标的变化趋势均不同
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Last time updated on 29/11/2016