Effects of vegetation removal on soil properties and decomposer organisms
Effects of vegetation removal on soil properties and decomposer organisms
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DOI：
10.1016/j.soilbio.2011.01.010
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发表时间：
2011-05
影响因子：
9.7
通讯作者：
Jie Zhao;Xiaoling Wang;Yuanhu Shao;Guo-liang Xu;S. Fu
中科院分区：
文献类型：
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作者：
Jie Zhao;Xiaoling Wang;Yuanhu Shao;Guo-liang Xu;S. Fu
清除林下植被是一种常见的森林管理做法，尤其是在人工林中，但清除林下植被对土壤理化性质和分解生物的影响知之甚少。在中国南部的一个乡土树种混交林中，研究了林下植被去除和全植物去除(即去除林下植被和乔木)对土壤性质和土壤生物量的影响。在雨季，除草食性线虫密度显著降低外，林下植被去除对土壤微生物群落和主要土壤动物类群的影响不明显。然而，所有植物的去除显著降低了真菌生物量、真菌/细菌比、草食性线虫密度、线虫群落结构以及螨类、弹尾目和总微型节肢动物的密度。在旱季，清除林下植被导致总线虫和草食性线虫密度显著下降。植物移栽对土壤生物群的影响与旱季相似。在两个季节，林下植被清除对土壤理化性质(土壤水分、pH、全氮和土壤有机碳)没有显著影响，但所有植物的清除显著降低了土壤pH。总体而言，林下植被去除对土壤生物群和其他土壤性质的影响要比全植物去除的严重得多。土壤生物群对林下植被的去除没有表现出明显的响应，这表明这部分植被可能不是这种生物群的主要控制因素。
The removal of understory vegetation has been a common forest management practice, especially in plantations, but the effects of understory removal on soil physico-chemical properties and decomposer organisms is poorly known. In the present study, the effects of understory vegetation removal and removal of all-plants (i.e. removal of understory vegetation and trees) on soil properties and soil biota were measured in a plantation of mixed native tree species in southern China. During the wet season, understory vegetation removal did not cause significant changes on soil microbial community and major soil faunal groups except for a marked reduction in the density of herbivorous nematodes. However, all-plants removal significantly decreased the fungal biomass, the fungal:bacterial ratio, the density of herbivorous nematodes, the structure of the nematode community, and the density of mites, collembola and total microarthropods. In the dry season, understory vegetation removal resulted in a marked reduction in the density of total and herbivorous nematodes. The effects of plant removal on soil biota were similar to that in dry season. For both seasons, understory removal had no significant effects on soil physico-chemical properties (soil water content, pH, total nitrogen and soil organic carbon) but removal of all-plants significantly decreased soil pH. In general, the effects of understory vegetation removal on soil biota and other soil properties were much less severe than those of all-plants removal. The soil biota did not show significant response to understory removal, suggesting that this part of the vegetation may not be a major governing factor on such biota.