Comparison of Soil Water Retention Characteristics for Different Part of Two Kinds of Hedgerow System in Loess Area
[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 imband hedgerows,which is the key mechanism to improve soil water retention and saturated soil permeability.
soil water retention curveCaragana korshinskiiArmeniaca sibiricahedgerows
国家科技期刊平台
NSTL
万方数据
维普
