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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, Liang1; Chen, Dongdong1; Zhao, Na1; Li, Qi1; Cheng, Qian2; Luo, Caiyun1; Xu, Shixiao1; Wang, Shiping3; Zhao, Xinquan1
2015-10-01
Source PublicationBIOLOGY AND FERTILITY OF SOILS
Volume51Issue:7Pages:781-790
SubtypeArticle
AbstractWe 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.; 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.
KeywordQinghai-tibetan Plateau Alpine Meadow Land Use Carbon Transfer C-13 Pulse Labeling
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
WOS KeywordGRAZING INTENSITY ; LOLIUM-PERENNE ; CO2 EXCHANGE ; RHIZOSPHERE ; RESPIRATION ; GRASSLANDS ; MANAGEMENT ; RYEGRASS ; PASTURE ; C-14
Indexed BySCI
Language英语
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000361348100002
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/5503
Collection中国科学院西北高原生物研究所
Affiliation1.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
Recommended Citation
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.
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