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

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Journal of Integrative Agriculture 2024年第8期23卷 2807-2819页

作者： Xiaotong Liu Siwei Liang Yijia Tian Xiao Wang Wenju Liang Xiaoke Zhang Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China Tillage and Cultivation Research Institute Liaoning Academy of Agricultural SciencesShenyang 110161China University of Chinese Academy of Sciences Beijing 100049China Key Lab of Conservation Tillage and Ecological Agriculture in Liaoning Province Shenyang 110016China

Land use influences soil biota community composition and diversity,and then belowground ecosystem processes and *** 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 *** richness,diversity,abundance and biomass of soil nematodes was the lowest in crop *** richness and diversity of soil nematodes were 28.8and 15.1%higher in fallow land than in crop land,*** significant differences in soil nematode indices were found between forest land and fallow land,but their network keystone genera composition was *** the keystone genera,50%of forest land genera were omnivores-predators and 36%of fallow land genera were *** proportion of fungivores in forest land was 20.8%lower than in fallow *** network complexity and the stability were lower in crop land than forest land and fallow *** pH,NH_(4)^(+)-N and NO_(3)^(–)-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 *** nematode communities in crop land influenced by artificial management practices were more dependent on the soil environment than communities in forest land and fallow *** use induced soil environment variation and altered network relationships by influencing trophic group proportions among keystone nematode genera.

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

Effect of heavy metals on soil nematode communities in the vicinity of a metallurgical factory

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Journal of Environmental Sciences 2006年第2期18卷 323-328页

作者： LI Qi JIANG Yong LIANG Wen-ju Key Laboratory of Terrestrial Ecological Process Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

The influence of Cu and Zn on soil nematode communities was examined along a pollution gradient with increasing distance from a metallurgical factory. Total and available heavy metal contents were used to study the effects of heavy metals on nematode abundance, trophic groups and ecological indices. The results demonstrated significant correlations between the number of total nematodes, bacterivores, plant-parasites and the total and available heavy metals. Bacterivores and plant-parasites were the dominant trophic groups. Significant differences in different sampling sites were found only in the number of bacterivores（P〈0.01）. The Shannon-Weaver diversity index（W）, trophic diversity index（TD）, evenness index（J＇） and dominance index（λ） were found to be sensitive to soil pH and C/N ratios. Significant correlations were found between the total nematodes （TNEM）, some genera （A crobeloides, Aphelenchoides, Cephalobus, Ditylenchus, Mesorhabditis, Tetylenchus and Tylenchus） and distance from the factory.

关键词： soil nematodes trophic groups ecological indices heavy metals metallurgical factory

Soil Biota in the Arava Valley of Negev Desert,Israel

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Pedosphere 2010年第3期20卷 273-284页

作者： S. PEN-MOURATOV T. MYBLAT I. SHAMIR G. BARNESS Y. STEINBERGER The Mina & Everard Goodman Faculty of Life Sciences Bar-Ilan University

Soil microorganism biomass and respiration and the soil nematode community were observed in the hypersaline desert valley that is found between the Dead Sea and the Red Sea. The lowest point of the valley is approximately 400 m below sea level, and is the lowest point on earth. Soil samples (n = 72) were collected from the 0-10 and 10-20 cm soil layers at different altitudes (from -400 to +100 m) in the open spaces between plants during one of the most extreme xeric periods. Both soil microbial respiration and microbial biomass were found to be negatively dependent on soil moisture (SM) and organic matter (OM), and positively dependent on pH values. The physical-chemical characteristics of this hypersaline area were extremely unfavorable for the soil nematode communities, and the nematodes were entirely absent in the open area below sea level. The bacterivores were found to be the most resistant nematodes in this hyperarid region, with the Wilsonema being the most widespread genus. We suggest that nitrogen availability may play a crucial role in the below-ground soil interaction in this region, with bacterivore nematodes as indicators of nitrogen availability.

关键词： Dead Sea microbial biomass nematode community respiration trophic groups

Aboveground herbivory increases soil nematode abundance of an invasive plant

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Journal of Plant Ecology 2020年第4期13卷 405-412页

作者： Jia Liu Susu Dai Wei Huang Jianqing Ding CAS Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074HubeiChina University of Chinese Academy of Sciences Beijing 100049China Core Botanical Garden Chinese Academy of SciencesWuhan 430074HubeiChina School of Life Sciences Henan UniversityKaifeng 475004HenanChina

Aims Plant invasions have the potential to affect the community structure of soil nematodes,but little is known about whether such effects are mediated by aboveground herbivores since invasive plants are not completely released from herbivores in the introduced *** this study,we explored how aboveground insect herbivores mediated the effect of invasive plant Alternanthera philoxeroides on soil nematodes and examined the temporal variations of such an herbivory-elicited *** We conducted a greenhouse experiment by applying different herbivory treatments(no insect herbivores,specialist Agasicles hygrophila and generalist Cassida piperata)to potted ***,and then measured the community compositions of soil nematodes in corresponding pots on the 1st,10th and 20th day after removal of all *** addition,the carbon content of roots and root exudate of *** were also *** Findings Our results showed that aboveground herbivory significantly increased the abundance of soil nematodes of ***,likely plant feeder nematodes,after insect herbivores were removed immediately(1st day).However,such impacts waned with time and there was no significant difference at later stages(10th and 20th days).Furthermore,the effects of specialist *** and generalist *** herbivory were consistent on the abundance of soil ***,our results suggest that aboveground insect herbivores have the potential to alter the effects of plant invasions on soil nematodes,but such impacts are ***,our study highlighted the importance of integrating the effects of above-and belowground organisms when evaluating the impacts of plant invasions.

关键词： aboveground insect herbivores soil nematodes trophic groups plant invasions temporal change

Soil Nematode Response to Biochar Addition in a Chinese Wheat Field

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Pedosphere 2013年第1期23卷 98-103页

作者： ZHANG Xiao-Ke LI Qi LIANG Wen-Ju ZHANG Min BAO Xue-Lian XIE Zu-Bin State Key Laboratory of Forest and Soil Ecology Institute of Applied Ecology Chinese Academy of Sciences University of Chinese Academy of Sciences Jiangsu Biochar Engineering Center State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences

While studies have focused on the use of biochar as soil amendment, little attention has been paid to its effect on soil fauna. The biochar was produced from slow pyrolysis of wheat straw in the present study. Four treatments, no addition (CK) and three rates of biochar addition at 2 400 (B1), 12 000 (B5) and 48 000 kg ha-1 (B20), were investigated to assess the effect of biochar addition to soil on nematode abundance and diversity in a microcosm trial in China. The B5 and B20 application significantly increased the total organic carbon and the C/N ratio. No significant difference in total nematode abundance was found among the treatments. The biochar addition to the soil significantly increased the abundance of fungivores, and decreased that of plant parasites. The diversity of soil nematodes was significantly increased by B1 compared to CK. Nematode trophic groups were more effectively indicative to biochar addition than total abundance.

关键词： diversity ecological indices microcosm trial nematode community trophic groups

The effects of plant resource inputs on the energy flux of soil nematodes are affected by climate and plant resource type

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Soil Ecology Letters 2021年第2期3卷 134-144页

作者： LINA ZHAO BINBIN YU MENGMENG WANG Jie Zhang Zhifeng Shen Yang Cui Junyong Li Ji Ye Weizhong Zu Xiaojing Liu Zongji Fan Shenglei Fu Yuanhu Shao Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions Ministry of EducationCollege of Environment and PlanningHenan UniversityKaifeng 475004China CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110164China Changbai Mountain Nature Conservation Management Center Yanbian 133613China Baotianman National Nature Reserve Administrative Bureau Nanyang 474350China Administration of Dinghushan National Nature Reserve South China Botanical GardenChinese Academy of SciencesZhaoqing 526070China

The relative abundance of different components of the soil food web can vary tremendously in response to plant resource ***,little is known about the mechanisms that plant resource regulates the energy fluxes and soil community ***,we experimentally reduced litter and root inputs for two years in China at low-,mid-,and high-latitude forests to explore the effects of plant-derived resource inputs on the nematode energy flux and community *** reduction at high and mid latitudes and root removal at low latitudes reduced nematode richness but did not alter nematode ***,litter reduction reduced energy fluxes of bacterial-feeding nematodes at mid latitudes and energy fluxes of plant-feeding,bacterial-feeding and omnivorous-predatory nematodes at low latitudes,thus reducing the energy fluxes of total nematodes in mid-and low-latitude *** contrast,root removal reduced energy fluxes and relative energy flux of plant-feeding nematodes in high-and low-latitude *** most cases,nematode diversity in different trophic groups increased with increasing energy flux to *** together,our results suggest that the effects of plant resource inputs on nematode energy flux are affected by climate and plant resource type,which improves our understanding of plant-soil interactions.

关键词： Soil nematodes Leaf litter Root Energy flux Diversity trophic groups Climate Plant-soil interactions Soil food web