NDLI: Effect of water stress on ecosystem photosynthesis and respiration of a Leymus chinensis steppe in Inner Mongolia

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Effect of water stress on ecosystem photosynthesis and respiration of a Leymus chinensis steppe in Inner Mongolia

Content Provider	Springer Nature Link
Author	Fu, Yuling Yu, Guirui Wang, Yanfen Li, Zhengquan Hao, Yanbin
Copyright Year	2006
Abstract	Many studies on global climate have forecast major changes in the amounts and spatial patterns of precipitation that may significantly affect temperate grasslands in arid and semi-arid regions. As a part of ChinaFLUX, eddy covariance flux measurements were made at a semi-arid Leymus chinensis steppe in Inner Mongolia, China during 2003–2004 to quantify the response of carbon exchange to environmental changes. Results showed that gross ecosystem production (F $_{GEP}$) and ecosystem respiration (R $_{eco}$) of the steppe were significantly depressed by water stress due to lack of precipitation during the growing season. Temperature was the dominant factor affecting F $_{GEP}$ and R $_{eco}$ in 2003, whereas soil moisture imposed a significant influence on both R $_{eco}$ and F $_{GEP}$ in 2004. Under wet conditions, R $_{eco}$ showed an exponentially increasing trend with temperature (Q $_{10}$ = 2.0), but an apparent reduction in the value of R $_{eco}$ and its temperature sensitivity were observed during the periods of water stress (Q $_{10}$=1.6). Both heat and water stress can cause decrease in F $_{GEP}$. The seasonality of ecosystem carbon exchange was strongly correlated with the variation of precipitation. With less precipitation in 2003, the steppe sequestrated carbon in June and July, and went into a senescence in early August due to water stress. As compared to 2003, the severe drought during the spring of 2004 delayed the growth of the steppe until late June, and the steppe became a CO$_{2}$ sink from early July until mid-September, with ample precipitation in August. The semi-arid steppe released a total of 9.7 g C·m$^{−2}$ from May 16 to the end of September 2003, whereas the net carbon budget during the same period in 2004 was close to zero. Long-term measurements over various grasslands are needed to quantify carbon balance in temperate grasslands.
Starting Page	196
Ending Page	206
Page Count	11
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	49
Issue Number	2
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Leymus chinensis steppe water stress ecosystem respiration gross ecosystem production net ecosystem CO$_{2}$ exchange Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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