生态学报2018，Vol.38Issue(9)：3183-3194,12.DOI:10.5846/stxb201706281164
陆生植物生物量分配对模拟氮沉降响应的Meta分析
A meta-analysis of the response of terrestrial plant biomass allocation to simulated N deposition
摘要
Abstract
This study aimed to reveal terrestrial plant biomass allocation between aboveground and belowground tissues under nitrogen (N) deposition and to provide a foundation for studying carbon (C) and N cycles,stand harvests,direct cultivation in different ecosystems,and relevant research and practices regarding plant biomass allocation.Through synthesizing data from 63 peer-reviewed publications,we quantified the response of plant biomass allocation to N deposition by meta-analysis and assessed the influences on plant biomass allocation of different ecosystem types,plant species,and N forms and levels.This study found that N deposition significantly increased the aboveground biomass of plants,with plant leaf biomass and stem biomass showing an increasing trend under N application.However,although underground biomass increased under N deposition,the increase was less than that of the aboveground biomass.Fine root biomass and coarse root biomass did not change significantly under N deposition.The root:shoot ratio decreased significantly under N application.Leaf weight ratio,stem weight ratio,and root weight ratio did not change significantly under N deposition.In addition,subgroup analysis showed that there were differences in the response of the root:shoot ratio and total biomass to N deposition for both ecosystem type and plant species.Herbaceous plant biomass accumulation increased significantly more than that of woody plants,which meant N deposition could increase the coverage of herbaceous plants.Nitrogen forms significantly affected the response of the root:shoot ratio to N application,with ammonium nitrate having a more significant effect on the root:shoot ratio than urea.The response of aboveground biomass to N application was significantly affected by the level of N application.Aboveground biomass was promoted the most at a medium N level (60-120 kg hm-2a-1) and at a high N level (≥ 120 kg hm-2 a-1),there was less of an effect,which was consistent with the change in total biomass.This result indicates that excessive N deposition inhibits plant growth.In addition,there were temporal differences in the effects of N application on the aboveground biomass of plants.In this study,when the N application time was longer than 3 years,the effect of N application on aboveground biomass was negligible.In conclusion,short term N application will allow most terrestrial plants to allocate more biomass to aboveground parts and the biomass accumulation of herbaceous plants is better than that of woody plants.These conclusions will provide a reasonable scientific basis for future correlative studies on plant carbon storage,community structure,tree species diversity,and vegetation dynamics under N deposition.关键词
陆生植物/meta分析/氮沉降/植物生物量分配/根冠比/根重比Key words
terrestrial plant/meta-analysis/N deposition/plant biomass allocation/root shoot ratio/root weight ratio引用本文复制引用
毛晋花,邢亚娟,闫国永,王庆贵..陆生植物生物量分配对模拟氮沉降响应的Meta分析[J].生态学报,2018,38(9):3183-3194,12.基金项目
国家自然科学基金(41773075,41575137,31370494,31170421,31070406) （41773075,41575137,31370494,31170421,31070406）
