不同土地利用方式下表层土壤大团聚体特征

发布时间：2018-02-12 11:00

本文关键词： 辽河干流中下游流域土地利用方式土壤大团聚体水稳定性空间分布　出处：《草业科学》2017年05期 　论文类型：期刊论文

【摘要】：土壤大团聚体含量能表征土壤结构稳定性,反映土壤结构变化趋势。本研究在辽河干流中下游流域主要沙化区分析湿地、林地、农田和草地4种土地利用方式对0-20cm土层土壤大团聚体(0.25 mm)含量和稳定性的影响,及各粒径大团聚体的空间异质性,并进行空间插值模拟其分布。结果显示,农田土壤团聚体破坏率最大,达到46.98%,林地最小,为26.36%;依据土壤水稳性大团聚体含量、团聚体颗粒平均重量直径和几何平均直径,评价土壤结构稳定性强弱为湿地林地农田草地;4种土地利用导致土壤大团聚体稳定性差异显著(P0.05),湿地和草地之间的差异性最显著;湿地土壤结构相对最好,其次是林地和农田,草地相对最差。本研究结果可为辽河干流流域土地沙化程度评价及分区治理提供参考依据。
[Abstract]:The content of soil macroaggregates can represent the stability of soil structure and reflect the changing trend of soil structure. In this study, wetland and woodland were analyzed in the main sandy areas of the middle and lower reaches of Liaohe River. The effects of farmland and grassland land use patterns on the content and stability of large aggregates in 0-20cm soil layer and the spatial heterogeneity of large aggregates were studied. The distribution was simulated by spatial interpolation. The damage rate of soil aggregate in farmland was the highest, reaching 46.98, and that in woodland was the smallest, which was 26.36.The average weight diameter and geometric average diameter of aggregate particles were obtained according to the content of soil water stable aggregates. To evaluate the stability of soil structure, four kinds of land use in wetland woodland, farmland, grassland and grassland resulted in significant difference in the stability of soil aggregate, the difference between wetland and grassland was most significant, and the structure of wetland soil was the best, followed by woodland and farmland. The results of this study can provide a reference for the evaluation of land desertification degree and zoning management in Liaohe River main river basin.
【作者单位】：沈阳农业大学水利学院;辽宁双台河口湿地生态国家定位观测研究站;
【基金】：国家自然基金面上项目(31470710);国家自然基金面上项目(31570706)
【分类号】：S152.4

【相似文献】