应用生态学报2018，Vol.29Issue(1)：59-67,9.DOI:10.13287/j.1001-9332.201801.006
增温施氮对高寒草甸生产力及生物量分配的影响
Effects of warming and nitrogen addition on community production and biomass allocation in an alpine meadow
摘要
Abstract
A long-term experiment,involving exogenous N addition and simulated warming,was conducted in an alpine meadow in Damxung,northern Tibet,to study how warming and N addition influence community production and biomass allocation.The results showed that warming resulted in a warm but dry microsite,that was,air temperature increased by 1.6 ℃ and soil surface temperature increased by 1.4 ℃,and soil water content decreased by 4.7％.Under no N addition treatments,warming significantly decreased plant aboveground biomass by 61.5％,108.8％ and 77.1％ in 2012,2013 and 2014,respectively.Under high N treatments (40 and 80 kg N · hm-2 · a-1),warming had no significant effect on aboveground biomass.These findings indicated that the effect of warming might be dependent on N addition level,and N addition could compensate for soil N loss caused by warming.Warming led to an increase in root/shoot by 98.6％,60.7％ and 97.8％ in 2012,2013 and 2014 under no N addition treatments,respectively.Under the ambient condition,the change percentages of aboveground and belowground biomass of plant communities first increased and then decreased along an N gradient,with the saturation thresholds of above-and below-ground biomass for N addition 56.0 and 55.5 kg N · hm-2 · a-1,respectively.Under the warming condition,above-and belowground biomass increased linearly with increasing N addition.These findings suggested that warming modulated the response patterns of alpine meadows to exogenous N input,which was mainly caused by decreased soil inorganic N under warming.The estimation of N thresholds highlights that alpine meadows are more sensitive to future N deposition than other types of grasslands.关键词
增温/施氮/高寒草甸/群落生产力/生物量分配/饱和阈值Key words
climate warming/nitrogen addition/alpine meadow/community production/biomass allocation/saturation threshold引用本文复制引用
宗宁,段呈,耿守保,柴曦,石培礼,何永涛..增温施氮对高寒草甸生产力及生物量分配的影响[J].应用生态学报,2018,29(1):59-67,9.基金项目
本文由中国科学院西部青年学者项目(2015)、国家青年科学基金项目(41703079)、国家自然科学基金项目(31470506)、青年创新团队项目(LENOM2016Q0004)和国家重点研发计划项目(2016YFC0501803,2016YFC0502001)资助 The work was supported by the West Light Foundation of the Chinese Academy of Sciences (2015),the National Science Foundation for Young Scientists of China (41703079),the National Natural Science Foundation of China (31470506),the Youth Innovation Research Team Project (LENOM2016Q0004) and the National Key Research and Development Program (2016YFC0501803,2016YFC0502001). （2015）
