温带半湿润地区草原风沙土的水分特征

Moisture Feature of Grasslandy Aeolian Sandy Soil in Semihumid Temperate District

温带半湿润地区的草原风沙土是草甸草原黑钙土地带内的幼年土，具有比干旱、半干旱沙区相对湿润的成土条件；流动草原风沙土的物理性状使其具有自我保墒性能，在干旱季节表现出比同区黑钙土更湿润的特征，并且土壤水有效性高；流动草原风沙土经植被固定而发育为半固定和固定风沙土后，逐渐失去自我保墒性能和湿润性；对草原风沙土进行人工生物固沙时，不宜大面积栽植速生杨树片林，否则随着草原风沙土的固定和树龄的增大，会因土壤水分不足而成片死亡或发育不良．

The grasslandy aeolian sandy soil in an semihumid temperate district which possess a more humid soil-forming condition than an arid/semi-arid sandy district,is a type of young soil in meadow-grassland cherrozem zone. The physical character of mobile grasslandy aeolian sandy soil results itself in a high moisture self-preserving ability, especially, in arid season it shows a more humid property than cherrozem in the same district, and the effectivity of soil water is high; After being consolidated by plantation into fixed and semifixed aeolian sandy soil, the mobile aeolian sandy soil will have gradually lost its moisture self-preserving ability and humidity;When the grasslandy mobile aeolian sandy soil is consolidated by artificial biotechnology,it is not apprepriate to plant extensively rapidgrowing poplars in form of tract forest, if not, as consolidating of the grasslandy aeolian sandy soil and increasing of the tree age, these treewoods would either die in tract or grow unhealthily because of the shortage of soil water.