Influences of land use history and short-term nitrogen addition on community structure in temperate grasslands |
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| Institution: | 1. State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China;2. College of Life Sciences, Henan University, Kaifeng, Henan 475004, China;3. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Beijing 100093, China;1. School of Environment, Beijing Normal University, Beijing 100875, China;2. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;3. School of Environment, Tsinghua University, Beijing 100084, China;4. Northwest Institute of Plateau Biology, Chinese Academy of Science, Key Laboratory of Restoration Ecology of Cold Are in Qinghai Province, Xining 810008, China;5. Qinghai Academy of Animal Husbandry and Veterinary Science, Qinghai University, Xining 810003, China;6. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523-1499, USA;1. Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China;2. College of environmental science and engineering, China West Normal University, Nanchong, China;3. University of the Chinese Academy of Sciences, Beijing, 10049, China,;4. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China,;1. College of Ecology and Environment, Hainan University, Haikou 570228, China;2. Northwest Institute of Eco-Environment and Resource, Chinese Academy of Sciences, Lanzhou 730000, China;3. Department of Biology and Graduate Degree Program in Ecology, Colorado State University, Fort Collins, CO 80523, USA;4. College of Environment and Resource Sciences, Zhejiang A&F University, Lin’an, Zhejiang 311300, China;1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China;2. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China;3. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;5. Freie Universität Berlin-Institut für Biologie, Dahlem Center of Plant Sciences, Plant Ecology, Berlin, Germany;6. Berlin-Brandenburg Institute of Advanced Biodiversity Research, Berlin, Germany;7. College of Agro-grassland Science, Nanjing Agricultural University, Nanjing 210095, China;1. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Inner Mongolia Prataculture Research Center, Chinese Academy of Science, Hohhot 010031, China;4. Institute of Agricultural Resources and Regional Planning, CAAS, Beijing 100081, China;5. Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031, China;6. School of Environment, Tsinghua University, Beijing 100084, China;1. Department of Grassland Science, College of Animal Science and Technology, Northwest A&F University, Yangling 712100, Shaanxi, China;2. Department of Grassland Science, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China |
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| Abstract: | Better understanding of plant community structure in relationship to land use history and nitrogen (N) will facilitate grassland conservation and projections of community succession under future N deposition. We conducted a field experiment in northern China to examine the influence of 2-year N addition on species composition and community structure in three temperate grasslands with different land use history: steppe fenced for two years (ST), steppe fenced for five years (SF), and old field grassland fenced for five years (OF). The results showed previous farming reduced species diversity and plant cover, which is mainly caused by decrease in perennial grasses (PG) and forbs (PF). Nitrogen addition increased plant cover, especially the PG cover, but had little effects on species diversity. Nitrogen enrichment also has a tendency to alter community composition by decreasing proportional cover of PF but increasing that of PG and annuals and biennials (AB), suggesting enhanced dominance of PG under increasing N deposition. Irrespective of the short-term (2 years) experimental periods, our findings highlight the dominant role of land use history in structuring plant community, and have valuable implications for grassland conservation and model projections of ecosystem succession under global scenarios of N deposition in the semi-arid grasslands. |
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