科尔沁地区农田土壤沙漠化演变的研究

STUDY ON DESERTIFICATION OF FARMLAND SOIL IN KORQIN REGION, INNER MONGOLIA

本文通过对土壤沙漠化的研究，结果表明：（１）农田风蚀沙化过程中，土壤的粉沙粘粒含量、有机质和养分含量、土壤水分含量均趋于下降，而土壤容重、温度和ｐＨ值趋于升高；（２）土壤理化性质的恶化，是土壤粉沙粘粒和有机质吹蚀的结果，造成土壤粗粒化、蓄水保肥能力下降和水肥渗漏，其中风蚀对土壤理化性质的危害明显大于积沙；（３）农田土壤理化性质的沙漠化演变表现出既有连续性又有间断性，随着沙漠化的加剧，其连续性减弱，间断性增强。

The research results showed that in the desertification process of the soils, silt content,organic matter, available nutrients and water-holding capacity were gradually reduced but soil temperature ane pH rose; Worsening of the soil properties resulted from decreasing of silt and clay particles and organic matter caused the coarsing of soil particles, the lowering of water-holding capacity and the loss of nutrients in the process, the danger by wind erosion of soil was more serious than that by wind deposition; and in the desertification process of farmland soils, worsening of soil physical and chemical properties had both continuity and discontinuity.