【摘要】 沙漠地区生物土壤结皮层具有明显的养分富集现象,并对风沙土具有改良作用。选择鄂尔多斯沙区不同地点不同时间飞播建立的人工固沙林,研究了生物结皮层(苔藓类)土壤腐殖质组成含量及变化趋势。结果表明,生物结皮层腐殖质组成含量明显高于对照沙土,但不同地点之间差异不显著。随着沙地飞播造林固沙时间的延长,研究区生物结皮层腐殖质组成含量的变化总体呈增加的趋势,但不显著。不同气候区生物结皮层腐殖质组成和结构特征具有区域性特征,并在风沙土的成土过程中有所表现。更多还原

【Abstract】 The soil bio-crust(bryophyte layer) in desert area accumulates abundant nutrients,playing an important role in the amelioration of aeolian sandy soil.This paper studied the contents of various humus components and their changing tendency in soil bio-crust in the artificial dune-fixing forests established by fly-seeding at different years in Erdos desert areas.The results showed that the contents of various humus components in the crust were higher than the control,and increased with increasing year of the establishment of the forests.The humus composition and structure in the crust had their regional feature,which reflected in some extent the forming process of aeolian sandy soil.更多还原