ORIGINAL RESEARCH
Studying Soil Salinity and Its Relations with Microtopography and Vegetation at Field Scale
Chang-Wei Zhao1,2, Lu Xu1,2, Zhi-Chun Wang1, Yun-He Wang1,2, Chun-Ming Chi3
 
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1Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences,
Changchun 130012, China
2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
3Tarim University, Alar, Xinjiang 843300, China
 
Pol. J. Environ. Stud. 2013;22(4):1227–1237
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ABSTRACT
Spatial variation of soil salinity and sodicity is a typical characteristic of Songnen Plain grasslands in northeast China. Best management practices and grassland productivity improvement require further understanding of the relationships among the causal factors at field scale. A field soil survey for the interactions among salinity, microtopography, and vegetation was conducted on a 2.8 hectare saline sodic grassland at Da’an Sodic Land Experimental Station, Chinese Academy of Sciences, northeast China. Salinity of the soil decreases by depth increment with Na+ and HCO-3 as the dominant ions. Soil salinity and sodicity parameters measured include pH, electrical conductivity for 1 to 5 soil-water extracts (EC1:5), apparent electrical conductivity (ECa), sodium adsorption ratio, and exchangeable sodium percentage. Soil salinity is in an order of slope > mound > depression for microtopography and soil under S. corniculata community is in severe salinity, while there is no significant difference under P. australis-A. mongolica and P. australis communities. The water and salt regime in various microtopographical conditions also is discussed.
eISSN:2083-5906
ISSN:1230-1485