Responses of carbon transfer, partitioning, and residence time to land use in the plant-soil system of an alpine meadow on the Qinghai-Tibetan Plateau

	Responses of carbon transfer, partitioning, and residence time to land use in the plant-soil system of an alpine meadow on the Qinghai-Tibetan Plateau
	Zhao, Liang 1; Chen, Dongdong 1; Zhao, Na 1; Li, Qi1 ; Cheng, Qian 2; Luo, Caiyun 1; Xu, Shixiao 1; Wang, Shiping 3; Zhao, Xinquan 1
刊名	biology and fertility of soils
	2015-10-01
卷号	51 期号:7 页码:781-790
关键词	Qinghai-Tibetan Plateau Alpine meadow Land use Carbon transfer C-13 pulse labeling
中文摘要	we conducted an in situ c-13 pulse-labeling experiment from july to september 2011, involving three land use types: native alpine meadow with winter grazing (native meadow), cultivated perennial elymus nutans (perennial grass), and annual avena sativa (annual grass) pastures in the qinghai-tibetan plateau. thirty-two days after labeling, 32, 23, and 43 % of recovered c-13 of native meadow, perennial grass, and annual grass, respectively, were released by shoot respiration, and 43, 34, and 22 % were allocated to belowground c pools. about half of c-13 allocated to belowground c pools was released by soil respiration. mean residence time of net assimilate c in this ecosystem was 67, 118, and 43 days for native meadow, perennial grass, and annual grass, respectively. our results imply that species abundance and root/shoot ratio are the major controlling factors of soil c stocks in high-altitude grassland ecosystems, explaining 35 and 73 %, respectively. we suggest that conversion to monoculture for food production on the qinghai-tibetan plateau may deteriorate soil health through rapid loss of soil organic c. the main cause of c transfer reduction after conversion to monoculture is the change in species richness and root/shoot ratio. together with previous research studies, our results also support the finding that moderate grazing benefits grassland c transfer and stock, owing to higher species richness and root/shoot ratio.
英文摘要	we conducted an in situ c-13 pulse-labeling experiment from july to september 2011, involving three land use types: native alpine meadow with winter grazing (native meadow), cultivated perennial elymus nutans (perennial grass), and annual avena sativa (annual grass) pastures in the qinghai-tibetan plateau. thirty-two days after labeling, 32, 23, and 43 % of recovered c-13 of native meadow, perennial grass, and annual grass, respectively, were released by shoot respiration, and 43, 34, and 22 % were allocated to belowground c pools. about half of c-13 allocated to belowground c pools was released by soil respiration. mean residence time of net assimilate c in this ecosystem was 67, 118, and 43 days for native meadow, perennial grass, and annual grass, respectively. our results imply that species abundance and root/shoot ratio are the major controlling factors of soil c stocks in high-altitude grassland ecosystems, explaining 35 and 73 %, respectively. we suggest that conversion to monoculture for food production on the qinghai-tibetan plateau may deteriorate soil health through rapid loss of soil organic c. the main cause of c transfer reduction after conversion to monoculture is the change in species richness and root/shoot ratio. together with previous research studies, our results also support the finding that moderate grazing benefits grassland c transfer and stock, owing to higher species richness and root/shoot ratio.
WOS标题词	science & technology ; life sciences & biomedicine
类目[WOS]	soil science
研究领域[WOS]	agriculture
关键词[WOS]	grazing intensity ; lolium-perenne ; co2 exchange ; rhizosphere ; respiration ; grasslands ; management ; ryegrass ; pasture ; c-14
收录类别	SCI
语种	英语
WOS记录号	WOS:000361348100002
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/5503]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 81001, Peoples R China 2.Qinghai Normal Univ, Xining 81001, Peoples R China 3.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Liang,Chen, Dongdong,Zhao, Na,et al. Responses of carbon transfer, partitioning, and residence time to land use in the plant-soil system of an alpine meadow on the Qinghai-Tibetan Plateau[J]. biology and fertility of soils,2015,51(7):781-790.
APA	Zhao, Liang.,Chen, Dongdong.,Zhao, Na.,Li, Qi.,Cheng, Qian.,...&Zhao, Xinquan.(2015).Responses of carbon transfer, partitioning, and residence time to land use in the plant-soil system of an alpine meadow on the Qinghai-Tibetan Plateau.biology and fertility of soils,51(7),781-790.
MLA	Zhao, Liang,et al."Responses of carbon transfer, partitioning, and residence time to land use in the plant-soil system of an alpine meadow on the Qinghai-Tibetan Plateau".biology and fertility of soils 51.7(2015):781-790.