Effects of 22 years of re-vegetation on soil quality in the semi-arid area of the Loess Plateau
Liping Qiu1*, Xingchang Zhang1, Jimin Cheng1 and Xinning Han2
1Institute of Soil and Water Conservation, Northwest Science – Technology University of Agriculture and Forestry, Yangling 712100, China.
2Ningxia Teachers University, Guyuan 756000, China.
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