Shapotou;
Desert;
Research;
and;
Experiment;
Station,;
Cold;
and;
Arid;
Regions;
Environmental;
and;
Engineering;
Research;
Institute,;
Chinese;
Academy;
of;
Sciences,;
Lanzhou,;
Gansu;
730000,;
China;
生物土壤结皮; 腾格里沙漠; 固定沙丘; 碳释放; 降雨; 事件; 中国北方; 覆盖;