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

发布时间：2018-05-08 10:13

本文选题：黄土丘陵区 + 退耕年限　；参考：《草业学报》2016年10期

【摘要】：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(P0.05)。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。
[Abstract]:By using the method of space substitution time and comparative analysis, according to the sampling data of 8 years of returning cultivated land in loess hilly area, the paper studies the change of returning farmland with the period of returning farmland in the process of vegetation restoration. The interaction between vegetation regeneration and soil moisture and nutrients. The results showed that during the 35 years of returning cultivated land, the total number of species decreased, increased, decreased and increased. The Margalef index Shannon-Wiener index increased first, decreased and increased. However, the Pielou evenness index was opposite. 2) the aboveground underground biomass increased with the increase of the returning years, and there was a significant positive correlation between the above ground biomass and the soil nutrient (except for available K), the soil nutrient (except available K) decreased first and then increased with the increase of the returning years. But the available K content of soil decreased continuously, and the soil moisture content increased first and then decreased at 20 ~ 50 cm ~ 50 cm ~ (50) ~ 80 cm ~ (-1) ~ 80 cm ~ (-1) ~ 100cm, but on the contrary. 4) the vegetation characteristic index (except Pielou) was positively correlated with organic matter, total N, and total P in 0~20cm. There was no significant correlation between Pielou index and soil nutrient, but there was no significant correlation between Pielou index and soil nutrient.
【作者单位】：中国科学院水利部水土保持研究所;中国科学院大学;西北农林科技大学水土保持研究所;
【基金】：国家自然科学基金项目(41271043,31370455) 中国科学院知识创新工程“百人计划”项目资助
【分类号】：S812

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