人工苜蓿草地土壤理化性状变化

Change of Soil Physical and Chemical Properties in Alfalfa Field

为了明确西北旱地种植苜蓿对土壤物理性状、水分和养分的影响,对其进行了较为详尽地探讨。种植苜蓿能增加土壤团聚体含量,提高土壤通气透水能力。苜蓿生长发育时需要大量消耗土壤水分,连续多年种植苜蓿会导致土壤干燥化;种植苜蓿能提高土壤有机质和氮素水平,降低土壤磷、钾含量。施肥既能平衡土壤养分又能增加产草量。

The physical and chemical properties of soil in planting alfalfa field were studied. After planting alfalfa, the soil aggregate was increased and the permeability of soil moisture and aeration of soil was enhanced. Planting alfalfa consumed much soil water, therefore continual growth of alfalfa could form desiccative layer below upper soil layer. The contents of soil organic matter, total N were increased , but P and K were decreased after continual growth of alfalfa. The soil N, P and K could be balanced with applying fertilizer.