Nitrogen pools and cycles in Tibetan Kobresia pastures depending on grazing
文献类型：期刊论文
| 作者 | Sun, Yue3; Schleuss, Per-Marten4; Pausch, Johanna5; Xu, Xingliang1; Kuzyakov, Yakov2,3,6 |
| 刊名 | BIOLOGY AND FERTILITY OF SOILS
 |
| 出版日期 | 2018-07-01 |
| 卷号 | 54期号:5页码:569-581 |
| 关键词 | Kobresia pygmaea Gross mineralization Nitrogen uptake N-15 labeling Intensive grazing Grassland management |
| ISSN号 | 0178-2762 |
| DOI | 10.1007/s00374-018-1280-y |
| 通讯作者 | Xu, Xingliang(xuxingl@hotmail.com) |
| 英文摘要 | Kobresia 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. |
| WOS关键词 | PLANT-SPECIES DIVERSITY ; BELOW-GROUND CARBON ; ALPINE MEADOW ; CLIMATE-CHANGE ; GRASSLAND ECOSYSTEMS ; INORGANIC NITROGEN ; MINERAL-NUTRITION ; ATMOSPHERIC CO2 ; N AVAILABILITY ; PLATEAU |
| 资助项目 | National 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) |
| WOS研究方向 | Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:000434829400002 |
| 出版者 | SPRINGER |
| 资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China ; German Research Council (DFG) ; China Scholarship Council (CSC) |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/54708]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 通讯作者 | Xu, Xingliang |
| 作者单位 | 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China 2.Kazan Fed Univ, Inst Environm Sci, Kazan, Russia 3.Univ Goettingen, Dept Agr Soil Sci, D-37077 Gottingen, Germany 4.Univ Bayreuth, Dept Soil Ecol, BayCEER, D-95447 Bayreuth, Germany 5.Univ Bayreuth, Dept Agroecol, BayCEER, D-95447 Bayreuth, Germany 6.Univ Gottingen, Dept Soil Sci Temperate Ecosyst, D-37077 Gottingen, Germany |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地理科学与资源研究所
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