气候变化领域集成服务门户(CCPortal): The weak effects of fencing on ecosystem respiration, CH4, and N2O fluxes in a Tibetan alpine meadow during the growing season

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DOI	10.3724/SP.J.1226.2017.00554
	The weak effects of fencing on ecosystem respiration, CH4, and N2O fluxes in a Tibetan alpine meadow during the growing season
	Hu, YiGang; Zhang, ZhenHua; Wang, ShiPing; Zhang, ZhiShan; Zhao, Yang; Wang, ZengRu
通讯作者	Hu, YG ; Wang, SP (通讯作者)
发表日期	2017
ISSN	1674-3822
起始页码	554
结束页码	567
卷号	9 期号:6
英文摘要	Fencing is the most common land-management practice to protect grassland degradation from livestock overgrazing on the Tibetan Plateau. However, it is unclear whether fencing reduces CO2, CH4, and N2O emission. Here, we selected four vegetation types of alpine meadow (graminoid, shrub, forb, and sparse vegetation) to determine fencing effects on ecosystem respiration (Re), CH4, and N2O fluxes during the growing season. Despite increased average monthly ecosystem respiration (Re) for fenced graminoid vegetation at the end of the growing season, there was no significant difference between grazing and fencing across all vegetation types. Fencing significantly reduced average CH4 uptake by about 50% in 2008 only for forb vegetation and increased average N2O release for graminoid vegetation by 38% and 48% in 2008 and 2009, respectively. Temperature, moisture, total organic carbon, C/N, nitrate, ammonia, and/or bulk density of soil, as well as above-and belowground biomass, explained 19%similar to 71% and 6%similar to 33% of variation in daily and average Re and CH4 fluxes across all vegetation types, while soil-bulk density explained 27% of variation in average N2O fluxes. Stepwise regression showed that soil temperature and soil moisture controlled average Re, while soil moisture and bulk density controlled average CH4 fluxes. These results indicate that abiotic factors control Re, CH4, and N2O fluxes; and grazing exclusion has little effect on reducing their emission-implying that climatic change rather than grazing may have a more important influence on the budgets of Re and CH4 for the Tibetan alpine meadow during the growing season.
关键词	RECIPROCAL TRANSLOCATION EXPERIMENT NITROUS-OXIDE EMISSION TEMPERATURE SENSITIVITY SOIL RESPIRATION METHANE UPTAKE INNER-MONGOLIA CARBON-DIOXIDE VEGETATION STRUCTURE GRAZED PASTURES CLIMATE-CHANGE
英文关键词	fencing; ecosystem respiration; methane; nitrous oxide; Tibetan alpine meadow
语种	英语
WOS研究方向	Physical Geography
WOS类目	Geography, Physical
WOS记录号	WOS:000428714100005
来源期刊	SCIENCES IN COLD AND ARID REGIONS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258902
推荐引用方式 GB/T 7714	Hu, YiGang,Zhang, ZhenHua,Wang, ShiPing,et al. The weak effects of fencing on ecosystem respiration, CH4, and N2O fluxes in a Tibetan alpine meadow during the growing season[J]. 中国科学院青藏高原研究所,2017,9(6).
APA	Hu, YiGang,Zhang, ZhenHua,Wang, ShiPing,Zhang, ZhiShan,Zhao, Yang,&Wang, ZengRu.(2017).The weak effects of fencing on ecosystem respiration, CH4, and N2O fluxes in a Tibetan alpine meadow during the growing season.SCIENCES IN COLD AND ARID REGIONS,9(6).
MLA	Hu, YiGang,et al."The weak effects of fencing on ecosystem respiration, CH4, and N2O fluxes in a Tibetan alpine meadow during the growing season".SCIENCES IN COLD AND ARID REGIONS 9.6(2017).