林草间作地土壤低吸力段持水性能的初步研究

Water Retention in Low Suction Condition of Different Forest Grass Intercropping Land

以庄浪县5种林草间作模式为对象,在田间采用张力计法测定各模式地的低吸力段土壤水分特征曲线,分析各模式地的土壤持水性能,比较不同模式地的比水容量,结果表明,各模式地土壤含水率随吸力变化较快;五种模式不同土层土壤持水力存在明显差异,表层土壤持水力较大,60cm土层土壤持水能力最差。仁用杏+红豆草模式地土壤持水能力和供水能力最强,是最为耐旱模式,油松+紫花苜蓿模式供水能力最差。

Five forest-grass int ercropping models were taken as an object in Zhuanglang county, and soil water characteristic curve in low suction condition of different models was monitored by the method of tensiometer in field. The authors analyzed the soil water holding ability and compared the specific water capacity of different models. The results were as follows： Soil water content changed rapidly with soil suction, and the soil water holding capacity of the five models in different layers was different. The soil water holding capacity was the highest in surface layer, but lowest in 60cm layer.. The soil water holding and water supply capacity of the Prunus armeniaca＋Onobrychis viciacfolia model was highest, thus it was the strongest drought-resistant capability model. However, the capacity of water supply of the Pinus tabulaeformis＋Medicago Sativa model was the lowest.