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Nitrogen pools and cycles in Tibetan Kobresia pastures depending on grazing
Sun, Yue1; Schleuss, Per-Marten2; Pausch, Johanna3; Xu, Xingliang4; Kuzyakov, Yakov1,5,6
2018-07-01
Source PublicationBIOLOGY AND FERTILITY OF SOILS
ISSN0178-2762
Volume54Issue:5Pages:569-581
Corresponding AuthorXu, Xingliang(xuxingl@hotmail.com)
AbstractKobresia grasslands on the Tibetan Plateau comprise the world's largest pastoral alpine ecosystem. Overgrazing-driven degradation strongly proceeded on this vulnerable grassland, but the mechanisms behind are still unclear. Plants must balance the costs of releasing C to soil against the benefits of accelerated microbial nutrient mineralization, which increases their availability for root uptake. To achieve the effect of grazing on this C-N exchange mechanism, a (NH4)-N-15 (+) field labeling experiment was implemented at grazed and ungrazed sites, with additional treatments of clipping and shading to reduce belowground C input by manipulating photosynthesis. Grazing reduced gross N mineralization rates by 18.7%, similar to shading and clipping. This indicates that shoot removal by grazing decreased belowground C input, thereby suppressing microbial N mining and overall soil N availability. Nevertheless, NH4 (+) uptake rate by plants at the grazed site was 1.4 times higher than at the ungrazed site, because plants increased N acquisition to meet the high N demands of shoot regrowth (compensatory growth: grazed > ungrazed). To enable efficient N uptake and regrowth, Kobresia plants have developed specific traits (i.e., efficient above-belowground interactions). These traits reflect important mechanisms of resilience and ecosystem stability under long-term moderate grazing in an N-limited environment. However, excessive (over)grazing might imbalance such C-N exchange and amplify plant N limitation, hampering productivity and pasture recovery over the long term. In this context, a reduction in grazing pressure provides a sustainable way to maintain soil fertility, C sequestration, efficient nutrient recycling, and overall ecosystem stability.
KeywordKobresia pygmaea Gross mineralization Nitrogen uptake N-15 labeling Intensive grazing Grassland management
DOI10.1007/s00374-018-1280-y
WOS KeywordPLANT-SPECIES DIVERSITY ; BELOW-GROUND CARBON ; ALPINE MEADOW ; CLIMATE-CHANGE ; GRASSLAND ECOSYSTEMS ; INORGANIC NITROGEN ; MINERAL-NUTRITION ; ATMOSPHERIC CO2 ; N AVAILABILITY ; PLATEAU
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFC0501802] ; National Natural Science Foundation of China[31470560] ; National Natural Science Foundation of China[41671253] ; German Research Council (DFG)[DFG KU 1184/14] ; China Scholarship Council (CSC)
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; German Research Council (DFG) ; China Scholarship Council (CSC)
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000434829400002
PublisherSPRINGER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/54709
Collection中国科学院地理科学与资源研究所
Corresponding AuthorXu, Xingliang
Affiliation1.Univ Goettingen, Dept Agr Soil Sci, D-37077 Gottingen, Germany
2.Univ Bayreuth, Dept Soil Ecol, BayCEER, D-95447 Bayreuth, Germany
3.Univ Bayreuth, Dept Agroecol, BayCEER, D-95447 Bayreuth, Germany
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China
5.Univ Gottingen, Dept Soil Sci Temperate Ecosyst, D-37077 Gottingen, Germany
6.Kazan Fed Univ, Inst Environm Sci, Kazan, Russia
Recommended Citation
GB/T 7714
Sun, Yue,Schleuss, Per-Marten,Pausch, Johanna,et al. Nitrogen pools and cycles in Tibetan Kobresia pastures depending on grazing[J]. BIOLOGY AND FERTILITY OF SOILS,2018,54(5):569-581.
APA Sun, Yue,Schleuss, Per-Marten,Pausch, Johanna,Xu, Xingliang,&Kuzyakov, Yakov.(2018).Nitrogen pools and cycles in Tibetan Kobresia pastures depending on grazing.BIOLOGY AND FERTILITY OF SOILS,54(5),569-581.
MLA Sun, Yue,et al."Nitrogen pools and cycles in Tibetan Kobresia pastures depending on grazing".BIOLOGY AND FERTILITY OF SOILS 54.5(2018):569-581.
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