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Responses of tree and insect herbivores to elevated nitrogen inputs: A meta-analysis

文献类型： 外文期刊

作者： Li, Furong 1 ; Dudley, Tom L. 3 ; Chen, Baoming 1 ; Chang, Xiaoyu 1 ; Liang, Liyin 4 ; Peng, Shaolin 1 ;

作者机构： 1.Sun Yat Sen Univ, Sch Life Sci, State Key Lab Biocontrol, Guangzhou 510006, Guangdong, Peoples R China

2.Guangdong Acad Agr Sci, Publ Monitoring Ctr Agroprod, Guangzhou 510640, Guangdong, Peoples R China

3.Univ Calif Santa Barbara, Inst Marine Sci, Santa Barbara, CA 93106 USA

4.Univ Waikato, Sch Sci, Hamilton 3240, New Zealand

关键词： Elevate nitrogen inputs;Conifers;Broadleaves;Meta-analysis;Plant-insect interaction;Insect performance

期刊名称：ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY （ 影响因子：1.674； 五年影响因子：1.845 ）

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收录情况： SCI

摘要： Increasing atmospheric nitrogen (N) inputs have the potential to alter terrestrial ecosystem function through impacts on plant-herbivore interactions. The goal of our study is to search for a general pattern in responses of tree characteristics important for herbivores and insect herbivorous performance to elevated N inputs. We conducted a meta-analysis based on 109 papers describing impacts of nitrogen inputs on tree characteristics and 16 papers on insect performance. The differences in plant characteristics and insect performance between broadleaves and conifers were also explored. Tree aboveground biomass, leaf biomass and leaf N concentration significantly increased under elevated N inputs. Elevated N inputs had no significantly overall effect on concentrations of phenolic compounds and lignin but adversely affected tannin, as defensive chemicals for insect herbivores. Additionally, the overall effect of insect herbivore performance (including development time, insect biomass, relative growth rate, and so on) was significantly increased by elevated N inputs. According to the inconsistent responses between broadleaves and conifers, broadleaves would be more likely to increase growth by light interception and photosynthesis rather than producing more defensive chemicals to elevated N inputs by comparison with conifers. Moreover, the overall carbohydrate concentration was significantly reduced by 13.12% in broadleaves while increased slightly in conifers. The overall tannin concentration decreased significantly by 39.21% in broadleaves but a 5.8% decrease in conifers was not significant. The results of the analysis indicated that elevated N inputs would provide more food sources and ameliorate tree palatability for insects, while the resistance of trees against their insect herbivores was weakened, especially for broadleaves. Thus, global forest insect pest problems would be aggravated by elevated N inputs. As N inputs continue to rise in the future, forest ecosystem management should pay more attention to insect pest, especially in the regions dominated by broadleaves. (C) 2016 Elsevier Masson SAS. All rights reserved.

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