河西走廊沙生灌木林对风沙土理化性质的影响

Effects of Psammophilic Shrubs on Physical and Chemical Properties of Aeolian Sandy Soil in Hexi Corridor

在河西走廊的风沙土区域,研究了梭梭、沙拐枣、花棒3种沙生灌木林对风沙土理化性质的影响。结果表明,不同沙生灌木林的风沙土孔隙度、团粒结构、蓄水量、有机质、碱效N、速效P、速效K、土壤阳离子交换量(CEC)、枯落物积累厚度、枯落物积累干质量、持水量、最大持水率由大到小的变化顺序为:梭梭>沙拐枣>花棒>沙滩(CK);风沙土容重、pH值、CaCO3、全盐由大到小的变化顺序为:沙滩(CK)>花棒>沙拐枣>梭梭。梭梭灌木林密度较大,枯落物积累量亦大,对风沙土水土保持和涵养水源有重要作用。

The influences of different psammophilic shrubs on the physical and chemical properties of aeolian sandy soil were studied in the Hexi Corridor. The results showed that total porosity, aggregate structure, storage capacity, soil organic matter, total N, available P, rapidly available K and CEC, layer thickness, litter accumulation of dry matter, water storage, and maximum water holding capacity of different forest shrub could be ranked in a descending order as Haloxylon ammodendron forest shrub〉Mongolion calligonum herb with fruit〉Hedysarum scoparium Frisch）bare sand（the control）. In addition, bulk density, pH value, Ca- CO3 and total salt of the soils could be ranked as bare sand（the control）〉Hedysarum scoparium Frisch） Mongolion calligonum herb with fruit〉Haloxylon ammodendron forest shrub. In short, the Haloxylon ammodendron forest shrub could contribute greatly to soil and water conservation because of its high shrub density and fast accumulation rate of litters.