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黄土丘陵区不同退耕年限草地群落 特征及其土壤水分养分效应
Authors
刘海威
张少康
焦峰
Publication date
1 January 2016
Publisher
Abstract
采用空间代替时间以及对比分析的方法,根据黄土丘陵区8个退耕年限序列(1~35年)的退耕地的采样数据 进行分析,研究在植被恢复过程中,随着退耕年限变化,植被更新与土壤水分养分之间的互动效应。结果表明,1) 黄土丘陵区在退耕35年期间,随着退耕年限的增加,总物种数呈减少-增加-减少-增加的趋势。Margalef指 数、Shannon-Wiener指数变化趋势为先增加-减小-增大,而Pielou均匀度指数相反。2)群落地上地下生物量随 退耕年限增大而增大,呈显著正相关关系(P<0.05)。3)随着退耕年限增加,土壤养分(除速效K外)含量先减少后 增加,而土壤速效K含量呈一直下降趋势,土壤水分含量在20~50cm、50~80cm、80~100cm处先增加后减少, 在0~20cm处相反。4)植被特征指数(除Pielou外)与有机质、全N、全P呈显著正相关,而与土壤养分速效K呈 正相关,关系不显著。Pielou指数与土壤养分呈正相关关系,但不显著。</p
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 12/06/2019