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荒漠灌木及冻融影响下的风沙土入渗特征
Authors
周宏飞
周宝佳.
汤英
Publication date
17 August 2010
Publisher
Abstract
通过在古尔班通古特沙漠南缘开展的风沙土入渗试验,分析了荒漠灌木对根区土壤入渗的影响以及沙漠地区 季节性冻土水分入渗特性。结果表明:荒漠灌木-梭梭根区的稳定入渗率与孔隙度具有随着距离树干的增加而迅速下降,这 一关系可用指数函数表示,沙垄间:K = 3.9266e-0.2466L(R2 = 0.959),沙垄上:K = 8.4713e-0.0739L (R2 = 0.933);沙垄顶上的 稳定入渗率值为垄间相应位置处的3-6 倍。沙漠地区季节性冻土具有较高的入渗能力,沙漠冻结风沙土的稳渗率为 0.26-0.30mm/min,是田间冻结壤土的10-20 倍,可以保证融雪水及时入渗进入土壤,为融雪水的高效储存创造了有利条件。入渗能力随着土壤含水率的升高而减小。沙地土壤初始的低含水率、土壤大孔隙结构特征是沙地冻结土壤具有较高入渗能力的主要原因
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Last time updated on 29/11/2016