Global patterns and controls of soil nematode responses to nitrogen enrichment: A meta-analysis
Global patterns and controls of soil nematode responses to nitrogen enrichment: A meta-analysis
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DOI：
10.1016/j.soilbio.2021.108433
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发表时间：
2021-12
影响因子：
9.7
通讯作者：
Qingqiu Zhou;Yangzhou Xiang;Debao Li;Xianzhen Luo;Jianping Wu
中科院分区：
文献类型：
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作者：
Qingqiu Zhou;Yangzhou Xiang;Debao Li;Xianzhen Luo;Jianping Wu
线虫是土壤食物网的重要组成部分，具有重要的生态功能。然而，土壤线虫群落对氮(N)沉积的响应在大的空间尺度上还没有得到很好的评估。在这里，我们进行了一项全球范围的荟萃分析，分析了氮素添加方式(氮素形态、氮素添加方法和氮素添加速率)和环境因素(生态系统类型、土壤深度、气候和土壤性质)对土壤线虫对氮素添加的响应的影响。结果表明，施氮显著提高了细菌食性线虫的相对丰度(23.54%)，降低了植物食性线虫(−20.24%)和杂食性捕食性线虫(−22.28%)的相对丰度。然而，氮的添加对总线虫丰度或食性线虫的相对丰度没有显著影响。林下施氮对线虫丰度的影响通常大于冠层施氮。在细菌食性线虫丰度和真菌食性线虫丰度的情况下，随着施氮量的增加，对氮素添加的响应增加，而在植物食性线虫和真菌食性线虫丰度的情况下，则随着施氮量的增加而降低。草地线虫丰度对氮素添加的响应比森林和农田更大，且受土壤深度的影响。随着年平均气温和年平均降水量的增加，摄食细菌的线虫对氮素添加的响应率降低，而植物食性线虫的响应率则呈相反的趋势。除植物寄生指数外，土壤pH和有机碳不影响线虫参数对施氮量的响应率。综上所述，在全球范围内，土壤线虫对氮素添加的响应受到氮素添加制度和环境因素的影响。我们认为，通过对冠层氮素添加和热带生态系统的进一步研究，我们将加深对氮沉降如何影响土壤线虫的理解。
Nematodes are important components of soil food webs and have important ecosystem functions. However, the responses of soil nematode communities to nitrogen (N) deposition have not been well assessed over large spatial scales. Here, we conducted a global-scale meta-analysis of the effects of N-addition regimes (N form, N addition approach, and N addition rate) and environmental factors (ecosystem type, soil depth, climate, and soil property) on the responses of soil nematodes to N addition. The results showed that N addition significantly increased the relative abundance of bacterial-feeding nematodes (23.54%), but decreased the relative abundance of plant-feeding nematodes (−20.24%) and omnivorous-predatory nematodes (−22.28%). Nitrogen addition, however, did not significantly affect total nematode abundance or the relative abundance of fungal-feeding nematodes. Understory N addition usually had larger effects on nematode abundance than canopy N addition. The responses to N addition increased with N addition rate in the case of bacterial-feeding nematode abundance, but decreased with N addition rate in the case of plant-feeding nematode and fungal-feeding nematode abundances. Nematode abundance in grasslands were more responsive to N addition than in forests or croplands, and the responses were affected by soil depth. The response ratios of bacterial-feeding nematodes to N addition decreased with increases in mean annual temperature and mean annual precipitation, while the response ratios of plant-feeding nematodes showed the opposite trend. Soil pH and organic carbon did not affect the response ratios of nematode parameters to N addition except plant parasite index. In summary, the responses of soil nematodes to N addition on a global scale were found to be affected by both N-addition regimes and environmental factors. We suggest that our understanding of how N deposition affects soil nematodes will be increased by additional studies of canopy N addition and of tropical ecosystems.