期刊
SOIL BIOLOGY & BIOCHEMISTRY
卷 32, 期 1, 页码 119-126出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0038-0717(99)00142-X
关键词
earthworms; organic matter; aggregation; microbial biomass and activity
类别
Earthworms were introduced into physically degraded soils restored after opencast coal mining. Their effects on soil organic matter and associated soil aggregation were then measured after a period of 9 yr. Earthworm inputs increased stable aggregation and resulted in a higher proportion of the soil organic matter as carbohydrates. Although the total amount of organic matter in the top 15 cm was unaffected by the presence of earthworms, there was some redistribution to depth. Earthworms also caused an increase in the carbon content of the clay-sized fraction. Aggregation was closely correlated with organic indices, particularly total carbohydrates. There was also evidence of organic matter having greater efficiency in stabilising aggregates where earthworms were abundant. Earthworm activity increased soil microbial biomass near the surface but caused a decrease at depth. Metabolic quotient was lower near the surface but higher at depth in soils with earthworms; mineralisation constants were lower in soils with earthworms at both sampling depths. Overall, the results emphasise the important influence of earthworm activity on aggregate and organic matter stabilisation, processes which are closely linked. (C) 2000 Elsevier Science Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据