Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau

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	Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau
	Cao, GM ; Tang, YH ; Mo, WH ; Wang, YA ; Li, YN ; Zhao, XQ
	2004-02-01
发表期刊	SOIL BIOLOGY & BIOCHEMISTRY
卷号	36 期号:2 页码:237-243
文章类型	Article
摘要	Grazing intensity may alter the soil respiration rate in grassland ecosystems. The objectives of our study were to (1) determine the influence of grazing intensity on temporal variations in soil respiration of an alpine meadow on the northeastern Tibetan Plateau; and (2) characterise, the temperature response of soil respiration under different grazing intensities. Diurnal and seasonal soil respiration rates were measured for two alpine meadow sites with different grazing intensities. The light grazing (LG) meadow site had a grazing intensity of 2.55 sheep ha(-1), while the grazing intensity of the heavy grazing (HG) meadow site, 5.35 sheep ha(-1), was approximately twice that of the LG site. Soil respiration measurements - showed that CO2 efflux was almost twice as great at the LG site as at the HG site during the growing season, but the diurnal and seasonal patterns of soil respiration rate were similar for the two sites. Both exhibited the highest annual soil respiration rate in mid-August and the lowest in January. Soil respiration rate was highly dependent on soil temperature. The Q(10) value for annual soil respiration was lower for the HG site (2.75) than for the LG site (3.22). Estimates of net ecosystem CO2 exchange from monthly measurements of biomass and soil respiration revealed that during the period from May 1998 to April 1999, the LG site released 2040 g CO2 m(-2) y(-1) to the atmosphere, which was about one third more than the 1530g CO2 m(-2) y(-1) released at the HG site. The results suggest that (1) grazing intensity alters not only soil respiration rate, but also the temperature dependence of soil CO2 efflux; and (2) soil temperature is the major environmental factor controlling the temporal variation of soil respiration rate in the alpine meadow ecosystem. (C) 2003 Elsevier Ltd. All fights reserved.; Grazing intensity may alter the soil respiration rate in grassland ecosystems. The objectives of our study were to (1) determine the influence of grazing intensity on temporal variations in soil respiration of an alpine meadow on the northeastern Tibetan Plateau; and (2) characterise, the temperature response of soil respiration under different grazing intensities. Diurnal and seasonal soil respiration rates were measured for two alpine meadow sites with different grazing intensities. The light grazing (LG) meadow site had a grazing intensity of 2.55 sheep ha(-1), while the grazing intensity of the heavy grazing (HG) meadow site, 5.35 sheep ha(-1), was approximately twice that of the LG site. Soil respiration measurements - showed that CO2 efflux was almost twice as great at the LG site as at the HG site during the growing season, but the diurnal and seasonal patterns of soil respiration rate were similar for the two sites. Both exhibited the highest annual soil respiration rate in mid-August and the lowest in January. Soil respiration rate was highly dependent on soil temperature. The Q(10) value for annual soil respiration was lower for the HG site (2.75) than for the LG site (3.22). Estimates of net ecosystem CO2 exchange from monthly measurements of biomass and soil respiration revealed that during the period from May 1998 to April 1999, the LG site released 2040 g CO2 m(-2) y(-1) to the atmosphere, which was about one third more than the 1530g CO2 m(-2) y(-1) released at the HG site. The results suggest that (1) grazing intensity alters not only soil respiration rate, but also the temperature dependence of soil CO2 efflux; and (2) soil temperature is the major environmental factor controlling the temporal variation of soil respiration rate in the alpine meadow ecosystem. (C) 2003 Elsevier Ltd. All fights reserved.
关键词	Biomass Carbon Cycle Co(2) Efflux q(10) Value Soil Temperature
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
学科领域	生物科学
关键词[WOS]	CARBON-DIOXIDE FLUXES ; MIXED-GRASS ; PRAIRIE ; NORTHERN ; BUDGET ; SEQUESTRATION ; STORAGE ; PLAINS
收录类别	SCI
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:000189081500005
引用统计	被引频次：332[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1400
专题	中国科学院西北高原生物研究所
作者单位	1.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan 2.Chinese Acad Sci, NW Plateau Inst Biol, Xining, Qinghai, Peoples R China 3.Univ Tsukuba, Inst Biol Sci, Tsukuba, Ibaraki 3058572, Japan 4.Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Cao, GM,Tang, YH,Mo, WH,et al. Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau[J]. SOIL BIOLOGY & BIOCHEMISTRY,2004,36(2):237-243.
APA	Cao, GM,Tang, YH,Mo, WH,Wang, YA,Li, YN,&Zhao, XQ.(2004).Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau.SOIL BIOLOGY & BIOCHEMISTRY,36(2),237-243.
MLA	Cao, GM,et al."Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau".SOIL BIOLOGY & BIOCHEMISTRY 36.2(2004):237-243.

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