干旱区生态环境知识资源中心(Arid): Topographic differentiations of biological soil crusts and hydraulic properties in fixed sand dunes, Tengger Desert

Arid

	Topographic differentiations of biological soil crusts and hydraulic properties in fixed sand dunes, Tengger Desert
	Zhang Zhishan; Chen Yongle; Xu Binxing; Huang Lei; Tan Huijuan; Dong Xuejun
来源期刊	Journal of Arid Land
ISSN	1674-6767
出版年	2015
卷号	7 期号:2 页码:205-215
英文摘要	Biological soil crusts (BSCs) play an important role in surface soil hydrology. Soils dominated with moss BSCs may have higher infiltration rates than those dominated with cyanobacteria or algal BSCs. However, it is unnown whether improved infiltration in moss BSCs is accompanied by an increase in soil hydraulic conductivity or water retention capacity. We investigated this question in the Tengger Desert, where a 43-year-old revegetation program has promoted the formation of two distinct types of BSCs along topographic positions, i.e. the moss-dominated BSCs on the interdune land and windward slopes of the fixed sand dunes, and the algal-dominated BSCs on the crest and leeward slopes. Soil water retention capacity and hydraulic conductivity were measured using an indoor evaporation method and a field infiltration method. And the results were fitted to the van Genuchten-Mualem model. Unsaturated hydraulic conductivities under greater water pressure (<-0.01 MPa) and water retention capacities in the entire pressure head range were higher for both crust types than for bare sand. However, saturated and unsaturated hydraulic conductivities in the near-saturation range (>-0.01 MPa) showed decreasing trends from bare sand to moss crusts and to algal crusts. Our data suggested that topographic differentiation of BSCs significantly affected not only soil water retention and hydraulic conductivities, but also the overall hydrology of the fixed sand dunes at a landscape scale, as seen in the reduction and spatial variability in deep soil water storage.
英文关键词	algal crusts hydraulic conductivity moss crusts soil water retention curve Tengger Desert
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	History
CSCD记录号	CSCD:5347506
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335443
作者单位	Zhang Zhishan, Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, Gansu 730000, China.; Chen Yongle, Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, Gansu 730000, China.; Xu Binxing, Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Key Laboratory of Stress Physiology and Ecology in Cold and Arid Regions of Gansu Province, Lanzhou, Gansu 730000, China.; Huang Lei, Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, ...
推荐引用方式 GB/T 7714	Zhang Zhishan,Chen Yongle,Xu Binxing,et al. Topographic differentiations of biological soil crusts and hydraulic properties in fixed sand dunes, Tengger Desert[J],2015,7(2):205-215.
APA	Zhang Zhishan,Chen Yongle,Xu Binxing,Huang Lei,Tan Huijuan,&Dong Xuejun.(2015).Topographic differentiations of biological soil crusts and hydraulic properties in fixed sand dunes, Tengger Desert.Journal of Arid Land,7(2),205-215.
MLA	Zhang Zhishan,et al."Topographic differentiations of biological soil crusts and hydraulic properties in fixed sand dunes, Tengger Desert".Journal of Arid Land 7.2(2015):205-215.