2、响)结果表明:随着降雨的进行,东北黑土的表层结构逐渐致密,容重、抗剪强度不断增加,入渗能力下降;!$(*+,降雨历时内,黑土发育了厚约#-.**的稳定结皮层,结皮发生层孔隙度下降/0.12、容重增加!.0!#2;消除雨滴打击后(盖网处理),结皮发育强度减弱,!$(*+,降雨历时内,结皮发生层孔隙度下降#0$’2、容重增加’)!!2,均小于无盖网处理,但累积入渗量较后者高.!0!2)东北黑土结构稳定,雨滴打击是其结皮发育的主导因子,降雨过程中未发现明显的颗粒淋移现象)关键词"黑土"结皮"发育过程"入渗"模拟降雨文章编号"!((!34##$($((5)($3(#1’3(/"中图分类号"6!1’)
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6、LBT?O+,#3.**M;+HS,?KK>OB+,%NOHOAKM,U+M;K<+LQ+LMOBM+<,+,HO?BK?NRT.!0!2)W;?RLBHSK<+L+,E7、?,B,NOB+,NOBHMHOAKM)XAO+,=M;?QOOB+,>BLL,,<+LMOBM+<,;K+*ALBM?NOB+,>BLL)""