文献类型：期刊文献

英文题名：Nitrogen deposition cancels out exotic earthworm effects on plant-feeding nematode communities

作者：Shao, Yuanhu[1,2] Zhang, Weixin[1,2] Eisenhauer, Nico[3,4] Liu, Tao[2,5] Xiong, Yanmei[6] Liang, Chenfei[7] Fu, Shenglei[1,2]

第一作者：Shao, Yuanhu

通信作者：Fu, SL[1];Fu, SL[2]

机构：[1]Henan Univ, Coll Environm & Planning, Minist Educ, Key Lab Geospatial Technol Middle & Lower Yellow, Kaifeng 475004, Peoples R China;[2]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, South China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China;[3]German Ctr Integrat Biodivers Res iDiv, Deutsch Pl 5e, D-04103 Leipzig, Germany;[4]Univ Leipzig, Inst Biol, Johannisallee 21, D-04103 Leipzig, Germany;[5]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[6]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[7]Zhejiang A&F Univ, Zhejiang Prov Key Lab Carbon Cycling Forest Ecosy, Linan 311300, Peoples R China

年份：2017

卷号：86

期号：4

起止页码：708-717

外文期刊名：JOURNAL OF ANIMAL ECOLOGY

收录：;Scopus(收录号：2-s2.0-85017402951);WOS:【SCI-EXPANDED(收录号:WOS:000403146400002)】；

基金：We are grateful to Mr Xingquan Rao for his help on the estimation of plant biomass. We also thank Yongxing Li for his help on soil and plant sampling and analyses. The authors are grateful to the editor and two reviewers for their helpful comments. This study was sponsored by Natural Science Foundation of China (31470559, 31100385 and 31210103920), Natural Science Foundation of Guangdong Province (2015A030313783), "Heshan National Field Research Station of Forest Ecosystem" and Prof. N.E. received support from the German Research Foundation (DFG FZT 118) and the European Research Council (ERC Starting Grant 677232, ECOWORM). The authors declare no conflict of interests.

语种：英文

外文关键词：above-ground-below-ground linkages; below-ground biotic interactions; earthworm invasion; nitrogen deposition; plant-feeding nematodes; soil nematodes

摘要：1. The activity and spread of exotic earthworms often are spatially correlated with N deposition because both arise from human activities. Exotic earthworms, in turn, can also greatly affect soil abiotic and biotic properties, as well as related ecological processes. Previous studies showed, for example, that earthworms can counteract the detrimental effects of plant-feeding nematodes on plant growth. However, potential interactive effects of N deposition and exotic earthworms on ecosystems are poorly understood. 2. We explored the changes in density of plant-feeding nematodes in response to the presence of exotic earthworms, and whether these changes are altered by elevated N deposition in a two-factorial field mesocosm experiment at the Heshan National Field Research Station of Forest Ecosystem, in southern China. 3. Our results show that earthworm addition marginally significantly increased the density of exotic earthworms and significantly increased the mass of earthworm casts. The total density of plant-feeding nematodes was not significantly affected by exotic earthworms or N deposition. However, exotic earthworms tended to increase the density of plant-feeding nematode taxa that are less detrimental to plant growth (r-strategists), while they significantly reduced the density of more harmful plant-feeding nematodes (K-strategists). Importantly, these earthworm effects were restricted to the ambient N deposition treatment, and elevated N deposition cancelled out the earthworm effect. Although exotic earthworms and N deposition interactively altered foliar N : P ratio in the target tree species, this did not result in significant changes in shoot and root biomass in the short term. 4. Overall, our study indicates that N deposition can cancel out exotic earthworm-induced reductions in the density of harmful plant-feeding nematodes. These results suggest that anthropogenic N deposition can alter biotic interactions between exotic and native soil organisms with potential implications for ecosystem functioning.