河西走廊荒漠化土壤资源及麻黄草改土培肥效应

Desertified Soil Resource and Effect of Soil Improvement and Fertilization by Planting Ephedra Intermedia in Hexi Corridor

论述了河西走廊荒漠化土壤的地理分布、成土条件、理化性质和主要亚类。在灰棕漠土上进行了麻黄草对荒漠化土壤改土培肥效应的研究。结果表明,种植3a麻黄草鲜草产量12.17t/hm2,折干草4.87t/hm2,与CK比较0—20cm土层中自然含水量增加64.29g/kg,>0.25mm团粒结构增加14.31%,总孔度增加11.32%,容重降低0.30g/cm3,pH由8.32降到7.99,全盐含量降低1.72g/kg,脱盐率达到49.85%,有机质、速效N,P,K亦随之增加。

<Abstrcat> The geographic distribution, soil forming conditions, physico-chemical properties and main subgroups of desertified soil in Hexi Corridor are discussed. Effect of the desertified soil and fertilization in the gray-brown desert soil is also studied. After three years cultivation of Ephedra intermedia whose fresh grass yield is 12.17 t/hm^2. Compared to CK in 0-20 cm soil layer, the soil water content, granular structure(>0.25 mm) and the total porosity are increased by 64.2 g/kg, 14.31% and 11.32% separately. The apparent density is decreased by 0.30 g/cm, soil pH from 8.32 to 7.99 and total salt by 1.72 g/kg. The rate of desalination reaches to 49.85%. At the same time, the content of soil organic matter, rapidly available N, rapidly available P and rapidly available K increase too.