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Annual mowing mitigates the negative legacy effects of N enrichment on grassland nutrient use efficiency

Journal of Plant Ecology 2021年第5期14卷 959-969页

作者： Yan-Yu Hu Zhi-Wei Zhang Shuang-Li Hou Jun-Jie Yang Xiao-Tao Lü Erguna Forest-Steppe Ecotonc Research Station CAS Key Laboratory of Forest Ecology and ManagementInstitute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Vegetation of Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China

Aims Plant nutrient use efficiency,an important factor driving primary production,is sensitive to nitrogen(N)*** of strengthened regulations of N emissions,atmospheric N deposition is decreasing in many *** remains unknown whether historical N enrichment would alter plant nutrient use efficiency and whether such impacts would be mitigated by ecosystem management *** We assessed the effects of historical N addition and mowing on plant N and phosphorus use efficiency(NUE and PUE)at both functional group and community levels in a temperate steppe after the cessation of 6-year N *** Findings Historical N addition had negative legacy effects on plant NUE but not on PUE at the functional group *** were negative legacy effects of N addition on community-level NUE and PUE,but only in the unmown *** mitigated the negative legacy effects of N enrichment on community-level NUE and PUE by reducing the dominance of tall rhizomatous grass but enhancing that of tall *** results highlight the importance of community composition variations caused by mowing in driving the legacy effects of N enrichment on community-level nutrient use *** the slow recovery of community composition following cessation of N deposition,our findings suggest that the lower nutrient efficiency of plant community would be long-lasting.

关键词： community composition hay harvest legacy effect nutrient utilization plant functional type semiarid grassland

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