黄泛平原风沙化土地种植牧草改良土壤效果研究

Study on Soil Amelioration Effect of Planting Grasses in Wind-sandy Land of Yellow River Floodplain

通过野外取样与室内分析相结合的方法，研究了黄泛平原风沙化土地种植高丹草、无芒雀麦、黑麦草、阿尔冈金苜蓿、沙打旺、草木樨后的土壤改良效果。结果表明：与对照风沙土相比，牧草种植区的土壤容重减小，土壤总孔隙度、毛管孔隙度与非毛管孔隙度增加，持水性能提高；土壤中的有机质、碱解氮、速效磷、速效钾含量分别提高了14．29％～126．53％、22．72％～376．15％、12．72％～364．09％和17．78％～114．76％，但不同牧草改良土壤的效果不同，豆科牧草对土壤的改良效果优于禾本科牧草。

The soil amelioration effect of planting Sorghum sudanense, Bromus inermis Leyss, Lolium pe renne , Medicago sativa cv. Algonquin, Astragalus adsurgens , Melilotus suaveolens in wind--sandy land of Yellow River floodplain were studied by field testing and indoor analysis. The results showed that planting grasses directly influenced the physical features and nutrient contents in soil. Compared with control, the soil bulk density decreased, while total soil porosity, capillary porosity, non--capillary porosity and water binding capacity increased; at the same time, the content of organic matter, alkali--hydrolysable N, available P and available K raised by 14.29% to 126. 53%, 22. 72% to 376. 15%, 12. 72% to 364.09% and 17.78% to 114.76% respectively, and then the amelioration effect was different with differ- ent grasses, and the effect of 3 kinds leguminous grasses was superior to 3 kinds of germanous grasses. Planting grasses was of great significance to ameliorating soil, preventing and controlling soil and water loss, developing grass industry and promoting accord development of ecology and economy in wind--sandy land of Yellow River floodplain.