元谋干热河谷山地植被修复区土壤种子库研究

Soil seed bank of vegetation restoration region in mountainous area of Yuanmou dry-hot valley

为了解干热河谷不同植被修复方法的土壤种子库的变化模式,采用对不同处理地段(包括水平阶间坡面、自然坡面、沟底)和对照(放牧地)的土壤种子库组成、大小进行比较研究的方法,研究元谋干热河谷山地植被修复区的土壤种子库。结果表明:1)植被修复区土壤种子库密度、丰富度均大于对照区;2)修复区内第2年土壤种子库密度、丰富度均大于第1年;3)水平阶间坡面和各类型间的土壤种子库密度差异显著;4)种子库中草本植物占很大比例;5)孔颖草和扭黄茅是种子库2大优势种。研究项目所采取植被修复措施在很大程度上改善土壤种子库的数量结构和物种组成。

In order to find out variation model of soil seed bank under different vegetation restoration methods in dry-hot valley, soil seed bank of vegetation restoration region in Yuanmou dry-hot valley mountainou was investigated by comparative methods, by which soil seed bank＇s composition and size between different soil management and pasture contrast were compared . The results showed that, density and species richness of soil seed bank in vegetation restoration region is superiority to contrast, density and species richness of soil seed bank of two years is higher than one year in restoration region, difference of soil seed bank density was notability among management measures, there was an absolutely high proportion of herbaceous species in the seed bank and the most frequent seeds were Bothriochloa pertusa （L.） A. Camus and Heteropogon contortus （L.） Beauv.