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	Water use efficiency threshold for terrestrial ecosystem carbon sequestration in China under afforestation
	Gao Y.; Tian J.
	2014
关键词	Water use efficiency C sequestration Afforestation Precipitation isoline Threshold value Climatic zone forest ecosystems semiarid areas eastern china nitrogen scale productivity environment limitation responses patterns
英文摘要	Forests play a vital role in global carbon (C) cycling. Accordingly, afforestation engineering programs that promote increased terrestrial C stocks are an important means to help gradually decrease atmospheric CO2 emissions. China, however, had increased its afforested area bordering hydroclimatic zones to 275.71 million hm(2) between 1949 and 2010. Ecosystem water use efficiency (EWUE) and plant water use efficiency (PVVUE) provide data on ecosystem sensitivity to water availability across rainfall regimes. The water consumption cost of C sequestration (WCCC) is also an important parameter that gauges the cost of C sequestration under afforestation. However, abrupt changes in EWUE and PWUE (threshold values of 1.5 and 3.6 gC kg(-1) H2O, respectively) have been measured within the 400-500 mm precipitation climatic isoline boundary situated between semi-humid and arid zones. The threshold value of the corresponding WCCC was 1.0 kg H2O gC(-1). Forest ecosystems in China typically generate high EVVUE and PWUE values (2.80 +/- 0.77 and 4.25 +/- 1.02 gC kg(-1) H2O, respectively) but low WCCC values (0.52 +/- 0.42 kg H2O g(-1) C), providing proof that afforestation is the best choice in increasing terrestrial C stocks. However, China's major afforestation engineering programs have concentrated efforts toward low EWUE and PWUE and high WCCC in the western region of the 400-500 mm precipitation isoline boundary, belonging to the arid and semiarid zones, which introduced potential environmental risks. Therefore, policies related to large-scale C sequestration initiatives under afforestation must first fully consider the statuses of WCCC and WUE. (C) 2014 Elsevier B.V. All rights reserved.
出处	Agricultural and Forest Meteorology
卷	195
页	32-37
收录类别	SCI
语种	英语
ISSN号	0168-1923
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29871]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Gao Y.,Tian J.. Water use efficiency threshold for terrestrial ecosystem carbon sequestration in China under afforestation. 2014.

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