c Xi’an Institute for Innovative Earth Environment Research, Xi’an 710061, P R China
* Corresponding author : Yanhong Gao
Address : Donggang West Road 320, Lanzhou, Gansu, China Zip Code: 730000
E-mail :gao_yanhong@lzb.ac.cn (Y. H. Gao)
Tel : +8613893454876 Fax : +86 0931 4967199
Highlights:
The planted shrub in for the study site in 1989 serves as a carbon sink.
Annual NEP showed a significant increasing trend over a 13-year period.
The increased NEP did not lead to more water loss through ET and further drying of soil moisture.  Carbon sequestration is mainly attributed to the advanced growing season and summer rainfall.