Knowledge Management System of Northwest Institute of Plateau Biology, CAS
| Different inter-annual responses to availability and form of nitrogen explain species coexistence in an alpine meadow community after release from grazing | |
| Song, Ming-Hua2,3; Yu, Fei-Hai1; Ouyang, Hua2; Cao, Guang-Min4; Xu, Xing-Liang2; Cornelissen, Johannes H. C.5 | |
| 2012-10-01 | |
| 发表期刊 | GLOBAL CHANGE BIOLOGY
 |
| ISSN | 1354-1013 |
| 卷号 | 18期号:10页码:3100-3111 |
| 文章类型 | Article |
| 摘要 | Plant species and functional groups in nitrogen (N) limited communities may coexist through strong eco-physiological niche differentiation, leading to idiosyncratic responses to multiple nutrition and disturbance regimes. Very little is known about how such responses depend on the availability of N in different chemical forms. Here we hypothesize that idiosyncratic year-to-year responses of plant functional groups to availability and form of nitrogen explain species coexistence in an alpine meadow community after release from grazing. We conducted a 6year N addition experiment in an alpine meadow on the Tibetan Plateau released from grazing by livestock. The experimental design featured three N forms (ammonium, nitrate, and ammonium nitrate), crossed with three levels of N supply rates (0.375, 1.500 and 7.500gNm-2yr-1), with unfertilized treatments without and with light grazing as controls. All treatments showed increasing productivity and decreasing species richness after cessation of grazing and these responses were stronger at higher N rates. Although N forms did not affect aboveground biomass at community level, different functional groups did show different responses to N chemical form and supply rate and these responses varied from year to year. In support of our hypothesis, these idiosyncratic responses seemed to enable a substantial diversity and biomass of sedges, forbs, and legumes to still coexist with the increasingly productive grasses in the absence of grazing, at least at low and intermediate N availability regimes. This study provides direct field-based evidence in support of the hypothesis that idiosyncratic and annually varying responses to both N quantity and quality may be a key driver of community structure and species coexistence. This finding has important implications for the diversity and functioning of other ecosystems with spatial and temporal variation in available N quantity and quality as related to changing atmospheric N deposition, land-use, and climate-induced soil warming.; Plant species and functional groups in nitrogen (N) limited communities may coexist through strong eco-physiological niche differentiation, leading to idiosyncratic responses to multiple nutrition and disturbance regimes. Very little is known about how such responses depend on the availability of N in different chemical forms. Here we hypothesize that idiosyncratic year-to-year responses of plant functional groups to availability and form of nitrogen explain species coexistence in an alpine meadow community after release from grazing. We conducted a 6year N addition experiment in an alpine meadow on the Tibetan Plateau released from grazing by livestock. The experimental design featured three N forms (ammonium, nitrate, and ammonium nitrate), crossed with three levels of N supply rates (0.375, 1.500 and 7.500gNm-2yr-1), with unfertilized treatments without and with light grazing as controls. All treatments showed increasing productivity and decreasing species richness after cessation of grazing and these responses were stronger at higher N rates. Although N forms did not affect aboveground biomass at community level, different functional groups did show different responses to N chemical form and supply rate and these responses varied from year to year. In support of our hypothesis, these idiosyncratic responses seemed to enable a substantial diversity and biomass of sedges, forbs, and legumes to still coexist with the increasingly productive grasses in the absence of grazing, at least at low and intermediate N availability regimes. This study provides direct field-based evidence in support of the hypothesis that idiosyncratic and annually varying responses to both N quantity and quality may be a key driver of community structure and species coexistence. This finding has important implications for the diversity and functioning of other ecosystems with spatial and temporal variation in available N quantity and quality as related to changing atmospheric N deposition, land-use, and climate-induced soil warming. |
| 关键词 | Aboveground Biomass Alpine Meadow Compensatory Dynamics Long-term Experiment Niche Differentiation Species Richness |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 关键词[WOS] | TERRESTRIAL ECOSYSTEMS ; NICHE COMPLEMENTARITY ; NUTRIENT LIMITATION ; PLANT-COMMUNITIES ; ORGANIC NITROGEN ; ARCTIC TUNDRA ; DEPOSITION ; GRASSLANDS ; DIVERSITY ; BIODIVERSITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
| WOS记录号 | WOS:000308443800011 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://210.75.249.4/handle/363003/3608 |
| 专题 | 中国科学院西北高原生物研究所 |
| 作者单位 | 1.Beijing Forestry Univ, Coll Nat Conservat, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Jiangsu, Peoples R China 4.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810008, Peoples R China 5.Vrije Univ Amsterdam, Fac Earth & Life Sci, Dept Ecol Sci, NL-1081 HV Amsterdam, Netherlands |
| 推荐引用方式 GB/T 7714 | Song, Ming-Hua,Yu, Fei-Hai,Ouyang, Hua,et al. Different inter-annual responses to availability and form of nitrogen explain species coexistence in an alpine meadow community after release from grazing[J]. GLOBAL CHANGE BIOLOGY,2012,18(10):3100-3111. |
| APA | Song, Ming-Hua,Yu, Fei-Hai,Ouyang, Hua,Cao, Guang-Min,Xu, Xing-Liang,&Cornelissen, Johannes H. C..(2012).Different inter-annual responses to availability and form of nitrogen explain species coexistence in an alpine meadow community after release from grazing.GLOBAL CHANGE BIOLOGY,18(10),3100-3111. |
| MLA | Song, Ming-Hua,et al."Different inter-annual responses to availability and form of nitrogen explain species coexistence in an alpine meadow community after release from grazing".GLOBAL CHANGE BIOLOGY 18.10(2012):3100-3111. |
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