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Long-term nitrogen addition alters the community and energy channel but not diversity of soil nematodes in a subtropical forest
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  • Qingqiu Zhou,
  • Xiaoli Wang,
  • Ying Wu,
  • Zhe Chen,
  • Debao Li,
  • Yuanhu Shao,
  • Jianping Wu
Qingqiu Zhou
Yunnan University
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Xiaoli Wang
State Key Laboratory of Plateau Ecology and Agriculture, Qinghai Academy of Animal and Veterinary Sciences, Qinghai University
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Ying Wu
Institute of Botany Chinese Academy of Sciences
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Zhe Chen
Yunnan University
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Debao Li
Yunnan University
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Yuanhu Shao
Henan University
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Jianping Wu
Yunnan University
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Abstract

Summary 1. Research has indicated that increases in nitrogen (N) deposition can greatly affect ecosystem processes and functions. There is limited information about the effects of long-term N addition on soil nematodes and their functional composition, although nematodes are the most abundant multicellular animals on Earth. 2. We conducted a field experiment in 2004 with four levels of N addition (0, 60, 120, and 240 kg N ha-1 yr-1) in a subtropical Cunninghamia lanceolata forest. Soil samples with three depths (0-20, 20-40 and 40-60 cm) were collected and the community structure, diversity and trophic groups of soil nematodes were determined in 2014. 3. N addition significantly increased the abundance of bacterial- and fungal-feeding nematodes, but decreased the abundance of plant-feeding nematodes at the 0-20 cm soil layer. Accordingly, the plant parasite index and enrichment index decreased but the basal index and channel index increased, which weaken the importance of the plant-based energy channel, but enhance the importance of the fungal-based energy channel. N addition had no effects on the diversity of soil nematodes in three soil depths. Structural equation modeling analysis indicated that N loading directly changed plant-feeding (total r2=0.42) nematodes, or indirectly affected bacterial- (r2=0.43), fungal- (r2=0.31) and plant-feeding nematodes via change soil nutrients, soil water content and pH. 4. These findings suggest that N addition can change the community structure and energy channels soil nematodes, which would affect soil processes and food web functions in forest soils under future environmental change scenarios.

Peer review status:UNDER REVIEW

10 Aug 2020Submitted to Ecology and Evolution
11 Aug 2020Submission Checks Completed
11 Aug 2020Assigned to Editor
24 Aug 2020Reviewer(s) Assigned
15 Sep 2020Review(s) Completed, Editorial Evaluation Pending
15 Sep 2020Editorial Decision: Revise Minor
21 Sep 20201st Revision Received
22 Sep 2020Submission Checks Completed
22 Sep 2020Assigned to Editor
22 Sep 2020Review(s) Completed, Editorial Evaluation Pending
22 Sep 2020Reviewer(s) Assigned