黄土区两种植物篱不同部位土壤持水特征对比
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"十二五"国家科技支撑课题"农田水土流失生物防护关键技术研究"(2011BAD31B02)


Comparison of Soil Water Retention Characteristics for Different Part of Two Kinds of Hedgerow System in Loess Area
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    摘要:

    [目的] 研究植物篱不同部位土壤持水性能的分异特征,指导植物篱系统的设计与经营管理。[方法] 在测定柠条、山杏两种典型植物篱土壤水分物理参数的基础上,利用van Genuchten模型比较分析植物篱系统带内、带间的土壤水分特征曲线及其参数。[结果] (1) 两种植物篱在土壤总孔隙度、水稳性团聚体含量、渗透系数等方面均高于耕地(对照),其中柠条植物篱带内土壤总孔隙度(66.36%)、水稳性微团聚体含量(35.50%)和有机质含量(44.1 g/kg)比带间分别高7.34%,1.95%和25.64%。山杏植物篱的这3项指标带内比带间分别高11.93%,29.33%和21.48%。(2) 柠条、山杏植物篱带内土壤脱湿过程中凋萎系数分别是耕地的7倍和3.25倍,田间持水量分别是耕地的1.46和1.25倍,柠条植物篱土壤保水优势更明显。(3) 在相同的土壤水吸力下,土壤吸湿与脱湿过程中带内土壤的水分含量均明显高于带间,带内土壤的持水性更高,这与带内较高的黏粒含量相一致;柠条带内土壤水分含量高于山杏带内,二者均高于耕地。[结论] 植物篱的二相结构能明显促进带内黏粒、微团聚体和养分的富集(有机质),进而提高带内土壤的持水性能和饱和渗透性能。

    Abstract:

    [Objective] To study the differentiation characteristics of soil water retention in different part of the hedgerow system in order to provide guidelines for design and management of hedgerow systems.[Methods] Based on measuring the physical parameters of soil moisture for Caragana korshinskii and Armeniacc sibirica, the soil water retention curve as well as derived parameters of in-band and inter-band of hedgerow System were compared by van Genuchten model. [Results] (1) The total soil porosity, water stable micro-aggregates content and soil permeability was higher for C. korshinskii and A. sibirica. hedgerows than farmland(as a check). Soil properties from the in-band of C. korshinskii such as total soil porosity(66.36%), water stable micro-aggregates content(35.50%) and organic matter content(44.1 g/kg) were 7.34%, 1.95% and 25.64% higher than that from the inter-band, respectively. Similarly, the above three indicators from the in-band hedgerows of A. sibirica were 11.93%, 29.33% and 21.48% higher than that from the inter-band hedgerows, respectively. (2) The wilting coefficient of C. korshinskii and A. sibirica was 7 and 3.25 times of farmland, respectively, and the field capacity was 1.46 and 1.25 times, respectively, which display a more obvious advantages in soil water retention of farmland. (3) The soil water content of the in-band hedgerows was higher than that from the inter-band for both moisture absorption and desorption process with the same soil water suction, which was consistent with the content of soil clay. The in-band soil water content of C. korshinskii was higher than that of A. sibirica. They were both higher than that in the farmland. [Conclusion] The two-phase structure of hedgerows can significantly promote the enrichment of soil clay, micro-aggregates and organic matter in in-band hedgerows, which is the key mechanism to improve soil water retention and saturated soil permeability.

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党宏忠,党汉瑾,李卫,冯伟,莫保儒.黄土区两种植物篱不同部位土壤持水特征对比[J].水土保持通报,2015,35(3):78-84

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  • 收稿日期:2014-01-13
  • 最后修改日期:2014-04-17
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  • 在线发布日期: 2016-04-05
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