QQ客服 官方微博 反馈留言

	Mechanism and bio-environmental controls of ecosystem respiration in a cropland in the North China Plains
	Li J.; Yu Q.; Li J.
	2007
关键词	ecosystem respiration Q(10) eddy covariance LAI soil temperature wheat-maize rotation system carbon-dioxide exchange eddy covariance terrestrial ecosystems flux measurements soil respiration temperate grassland seasonal-variation tallgrass prairie european forests co2 fluxes
英文摘要	CO2 flux was measured continuously using the eddy covariance technique in a wheat-maize rotation system in the North China Plains from October 2002 to October 2006. The annual and seasonal variation of ecosystem respiration and the bio-environmental controls on them were investigated. The results show that ecosystem respiration (R-ec) in the cropland increased exponentially with soil temperature at 5 cm depth. The temperature sensitivity coefficient (Q(10)) for ecosystem respiration varied from 3.5 to 5.4 for wheat and from 2.4 to 4.5 for maize. In the wheat growing season, monthly average R-0 (ecosystem respiration at 0 degrees C) increased linearly with soil temperature and logarithmically with leaf area index (LAI). Monthly average Q(10) decreased logarithmically with R-0 Residual R-ec was significantly correlated with LAI. After considering LAI, the modified Q(10) model could estimate R-ec better than before. The simulation results show that annual ecosystem respiration in the wheat-maize rotation system in the North China Plains was 1327, 1348, 1040 and 1171 gC m(-2) yr(-1) for the 4 years of the study. As a 4-year average, seasonal mean ecosystem respiration in wheat (2.60 gC m(-2) day(-1)) was much lower than in maize (6.09 gC m(-2) day(-1)). However, integrated ecosystem respiration for the wheat growing season (566 gC m(-2)) was slightly higher than that for maize (520 gC m(-2)). These account for 46.4 and 42.6% of the annual values, respectively.
出处	New Zealand Journal of Agricultural Research
卷	50
期	5
页	1347-1358
收录类别	SCI
语种	英语
ISSN号	0028-8233
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22968]
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	Li J.,Yu Q.,Li J.. Mechanism and bio-environmental controls of ecosystem respiration in a cropland in the North China Plains. 2007.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。