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侵蚀环境退耕撂荒地水稳性团聚体演变特征及土壤养分效应

ISSN号：1009-2242
期刊名称：水土保持学报
时间：0
页码：25-29
语言：中文
分类：S152.4[农业科学—土壤学;农业科学—农业基础科学] S158.3[农业科学—土壤学;农业科学—农业基础科学]
作者机构：[1]贵州大学林学院,贵州贵阳550025, [2]中国科学院西北农林科技大学水土保持研究所,陕西杨陵712100, [3]吉林省水土保持科学研究院,吉林长春130033, [4]聊城大学环境与规划学院,山东聊城252059
相关基金：国家自然科学基金重点项目（90502007）;中科院知识创新工程项目（KZCX2-XB2-05）;973课题（2007CB407205）
相关项目：黄土高原生态恢复的环境效应及评价

关键词：侵蚀环境, 退耕撂荒地, 水稳性团聚体, 养分状况, eroded hilly loess plateau, abandoned arable land, soil water stable aggregates, soil properties

中文摘要：

研究了侵蚀环境退耕撂荒地生态恢复过程中水稳性团聚体的变化规律及其与土壤养分状况及土壤微生物量的关系，结果表明，侵蚀环境退耕撂荒地土壤水稳性团聚体含量迅速提高，在退耕撂荒的第一个10年，水稳性团聚体增大约253．45％。随着退耕撂荒年限的延长，其增大幅度趋缓，第10～50年，水稳性团聚体仅增大16．42％，之后增大幅度更加缓慢，接近一个稳定的水平。相关性分析和回归分析表明侵蚀环境退耕地撂荒后土壤中〉0．25mm水稳性团聚体与土壤的有机碳、全氮、速磷、碳酸钙、微生物量（C，N，P）、CEC关系密切，达到显著（P〈0．05）或极显著水平（P〈0．01），而与速钾没有明显的相关性。要保持侵蚀环境退耕撂荒土壤良好的结构状况，必须坚持长期封禁，维持土壤有机碳变化处于平衡状态。

英文摘要：

In order to understand dynamics of soil water-stable aggregates along chronosequences and relationship with soil physico-chemical properties on abandoned arable land in eroded hilly loess plateau, 11 arable old land with different ages after being abandoned in Zhifanggou catchment were studied systematically through the approach of substituting the temporal serial with spatial serial. In addition, the correlation between soil water-stable aggregates and physico-chemical properties were examined. The results showed that the contents of soil water-stable aggregates increased promptly in early abandoned stage,and increased slowly with the extension of being abandoned, then kept a relatively stable content in the follow years. The contents increased by the percentage of 253.45% in the first 10 years of being abandoned, but by only of 16.42% in the follow 40 years. The significant correlations were observed between 〉0.25 mm aggregate and soil organic carbon, total nitrogen, available P, CaCO3, CEC and microbial biomass C, N, P, but not with available K. It is necessary to close and manage hillsides as well as keep soil organic carbon in a good balance in order to improve soil structure on abandoned arable land in eroded hilly loess plateau.

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