Effect of land use on soil nematode community composition and co-occurrence network relationship

doi:10.1016/j.jia.2023.11.019

Journal of Integrative Agriculture

2024, Vol. 23

Issue (8): 2807-2819 DOI: 10.1016/j.jia.2023.11.019

Agro-ecosystem & Environment

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Effect of land use on soil nematode community composition and co-occurrence network relationship

Xiaotong Liu^{1, 3}, Siwei Liang², Yijia Tian^{1, 3}, Xiao Wang^{1, 3}, Wenju Liang^{1, 4}, Xiaoke Zhang^{1, 4#}

¹ Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
² Tillage and Cultivation Research Institute, Liaoning Academy of Agricultural Sciences, Shenyang 110161, China
³ University of Chinese Academy of Sciences, Beijing 100049, China
⁴ Key Lab of Conservation Tillage and Ecological Agriculture in Liaoning Province, Shenyang 110016, China

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摘要

土地利用方式可以改变土壤生物的群落组成和多样性，从而影响地下生态系统的过程和功能。为了探究不同土地利用方式对土壤生物的影响，本研究对位于中国北方6个区域中3种不同土地利用方式，即农田、林地和撂荒地中的土壤线虫群落开展了调查研究。研究结果表明，农田土壤线虫的丰富度、多样性、丰度和生物量最低，撂荒地土壤线虫丰富度和多样性比农田高28.8%和15.1%。土壤线虫群落在林地中与撂荒地中无显著差异，但共现网络分析结果表明它们的关键属组成不同。林地的杂食-捕食线虫占网络关键属的50%，撂荒地的食细菌线虫占网络关键属的36%。在林地中，食真菌线虫在网络关键属的比例比撂荒地低了20.8%。共现网络的拓扑特性表明与林地和撂荒地相比，农田土壤网络复杂性和稳定性有所降低。土壤pH值、NH₄⁺-N和NO₃^--N是农田土壤线虫群落的主要影响因素，而土壤有机碳和含水量是林地土壤线虫群落的主要影响因素。经过人为管理的农田土壤线虫群落对土壤环境的依赖性更强。不同土地利用方式引起的土壤环境的变化可以通过改变共现网络中线虫营养类群在关键属中的比例，从而影响土壤生物的网络关系。

Abstract

Land use influences soil biota community composition and diversity, and then belowground ecosystem processes and functions. To characterize the effect of land use on soil biota, soil nematode communities in crop land, forest land and fallow land were investigated in six regions of northern China. Generic richness, diversity, abundance and biomass of soil nematodes was the lowest in crop land. The richness and diversity of soil nematodes were 28.8 and 15.1% higher in fallow land than in crop land, respectively. No significant differences in soil nematode indices were found between forest land and fallow land, but their network keystone genera composition was different. Among the keystone genera, 50% of forest land genera were omnivores-predators and 36% of fallow land genera were bacterivores. The proportion of fungivores in forest land was 20.8% lower than in fallow land. The network complexity and the stability were lower in crop land than forest land and fallow land. Soil pH, NH₄⁺-N and NO₃^–-N were the major factors influencing the soil nematode community in crop land while soil organic carbon and moisture were the major factors in forest land. Soil nematode communities in crop land influenced by artificial management practices were more dependent on the soil environment than communities in forest land and fallow land. Land use induced soil environment variation and altered network relationships by influencing trophic group proportions among keystone nematode genera.

Keywords: soil nematode trophic groups community composition co-occurrence network land use

Received: 18 August 2023 Accepted: 08 October 2023

Fund:

This research was supported by the National Natural Science Foundation of China (U22A20501), the National Key Research and Development Plan of China (2022YFD1500601), the National Science and Technology Fundamental Resources Investigation Program of China (2018FY100304), the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA28090200), the Liaoning Province Applied Basic Research Plan Program, China (2022JH2/101300184), the Shenyang Science and Technology Plan Program, China (21-109-3-05) and the Liaoning Outstanding Innovation Team, China (XLYC2008015).

About author: Xiaotong Liu, E-mail: liuxiaotong18@mails.ucas.ac.cn; #Correspondence Xiaoke Zhang, Tel: +86-24-83970359, E-mail: zxk@iae.ac.cn

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Xiaotong Liu, Siwei Liang, Yijia Tian, Xiao Wang, Wenju Liang, Xiaoke Zhang. 2024. Effect of land use on soil nematode community composition and co-occurrence network relationship. Journal of Integrative Agriculture, 23(8): 2807-2819.

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