supported by the National Natural Science Foundation of China(Grant Nos. 40730105, 40501072, and 40673067);the Ministry of Science and Technology of China (Grant Nos.2007BAC03A11 and 2002CB412503);The Knowledge Innovation Program of the Institute of Geographical Sciences;Natural Resources Research of the Chinese Academy of Sciences (The effect of human activities on re-gional environmental quality, health risk, and environmen-tal remediation)
The seasonal dynamics of soil respiration in steppe (S. bungeana), desert shrub (A. ordosica), and shrubperennial (A. ordosica +C. komarovii) communities were investigated during the growth season (May to Octo...