Effects of freeze-thaw on aggregate stability and the organic carbon and nitrogen enrichment ratios in aggregate fractions

文献类型： 外文期刊

第一作者： Chai, Y. J.

作者： Chai, Y. J.;Zeng, X. B.;Bai, L. Y.;Su, S. M.;Chai, Y. J.;E, S. Z.;Huang, T.

作者机构：

关键词： Aggregate;enrichment;freeze-thaw;long-term fertilizer application;nitrogen;organic carbon

期刊名称：SOIL USE AND MANAGEMENT （ 影响因子：2.95； 五年影响因子：3.109 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Soil samples from the Hexi Corridor located in the arid regions of Northwestern China were collected from a site that had received fertilizer applications for 23years. Effects of freeze-thaw on aggregate stability and the organic carbon (OC) and nitrogen (N) enrichment ratios in water stable aggregate (WSA) fractions were investigated. In treatments combining the application of N fertilizer with green manure (GN) or straw (SN), the percentage of >0.25mm WSA fraction was not significantly different from the control soil that received no fertilizer or organic amendment. After a freeze-thaw cycle, the percentages of the >0.25mm WSA fraction in the GN and SN treatments showed no change, but the size of this fraction in the other treatments decreased. In addition, the organic carbon (OC) and N enrichment ratios in the >0.25mm WSA fraction in GN and SN treatments increased after a freeze-thaw cycle. However, in this size fraction, the OC and N enrichment ratios decreased in other treatments. Both the changes of the percentages of the >0.25mm WSA fraction and the OC and N enrichment ratios in this fraction under freeze-thaw in the GN and SN treatments exhibited the most significant increases compared with other treatments (P<0.05). The results indicated that the GN and SN treatments could prevent the damaging effects of freeze-thaw on aggregate stability and protect soil from erosion.

分类号： S15

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