收稿日期: 2013-04-22
修回日期: 2013-06-28
网络出版日期: 2014-03-15
基金资助
国家自然科学基金（31200536）和国家林业局林业公益性行业专项（201104077）资助
Influences of biological soil crust in Artemisia ordosica community on the precipitation infiltration process
Received date: 2013-04-22
Revised date: 2013-06-28
Online published: 2014-03-15
使用EC-5土壤水分传感器，监测油蒿群落固定沙地上生物结皮覆盖完好（BSC）和去除生物结皮（NBSC）情况下不同深度土层对不同降水事件的响应及整个雨季的土壤水分特征. 研究结果如下：无论降水量大小，相同深度BSC的响应时间均显著大于NBSC；在同一降水事件中，BSC的初始入渗系数和平均入渗系数均显著低于NBSC；在小降水事件时，这种阻碍作用表现得更为明显. 油蒿的吸收根主要分布在40 cm以上土层中，而生物结皮的发育对小于20 mm的降水事件具有较强的阻碍作用；在研究区降水事件以小于20 mm降水为主的情况下，导致40 cm以内土壤水分恶化，久之将导致固定沙地油蒿群落的衰退；研究区降水格局的改变将对土壤水分及植被演替产生重要影响.
张军红 , 吴波 . 油蒿群落生物结皮对降水入渗过程的影响[J]. 中国科学院大学学报, 2014 , 31(2) : 214 -220 . DOI: 10.7523/jssn.2095-6134.2014.02.011
The response of different soil layers to different precipitations in both BSC and NBSC sites were analyzed using EC-5 soil moisture sensor during the whole rainy season. The results show that: 1) regardless of precipitation size the presence of BSC hindered the infiltration of precipitation, and this situation was more obvious in small precipitations; 2) most of the absorbing roots of A. ordosica were within the 40 cm soil, and the development of BSC caused serious impediment when the precipitation size was the less than 20 mm, which would result in the recession of A. ordosica in the fixed sand dunes if things continue in this way; and 4) the change of precipitation pattern would have an important impact on soil moisture and vegetation succession.
Key words： biological soil crust; soil moisture; Artemisia ordosica; Mu Us sandy land
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