Community structure and diversity of soil nematodes around Lake Paiku in Tibet, China

IF 0.7 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION
Huiying Xue, D. Luo, B. Duo, Qing Xue, Xingle Qu, Wen-Wen Guo
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引用次数: 1

Abstract

The diversity and community structure of soil nematodes around Lake Paiku in Mount Qomolangma (Mt. Everst) National Nature Reserve were investigated, to obtain soil ecosystem information, assess local soil quality, and provide the basis for environmental protection. Twelve plots were selected for typical vegetation communities around the lake. Within each plot, soil samples were collected from depths of 0 to 25 cm. The Baermann tray method was used to extract nematodes. Overall, we acquired 2,272 nematodes belonging to 2 classes, 5 orders, 32 families and 48 genera. The nematode density was 0–413 individuals per 100 g dry soil (average 109). Bacterivores, predators and omnivores were the dominant trophic groups. The individual density and genus numbers of soil nematodes were highest in the northeast and southeast corners of the lake. For most of the area studied, soil nutrients were at a medium level and there was no human disturbance. The energy flow of the soil food web tends to be via fungus decomposition channels. The redundancy analysis shows that soil-available P, pH, alkali-hydrolytic N, and soil-available K have strong effects on the soil nematode community, whereas the soil’s total N, organic matter and water content have only minor effects. Soil-available P and pH were negatively correlated with nematode diversity. Soil nematodes showed surface aggregation; the soil food webs tend to have complex structures because of the presence of K-strategist organisms; the lakeshore ecosystem is in the late stage of succession and relatively stable. The increasing amount of soil-available P and increasing pH value corresponded to reduced biodiversity and unstable soil nematode communities. A greater diversity of nematodes were found in the Lake Paiku region in comparison to studies carried out in alpine meadows of the Chang Tang (or Northern Tibet) Grasslands.
西藏白库湖土壤线虫群落结构与多样性
对珠穆朗玛峰国家级自然保护区白库湖周边土壤线虫的多样性和群落结构进行了调查,以获取土壤生态系统信息,评价当地土壤质量,为环境保护提供依据。选取12个样地作为环湖典型植被群落。在每个地块内,从0 ~ 25 cm深度采集土壤样品。采用Baermann托盘法提取线虫。共获得线虫2272只,隶属5目32科48属2纲。线虫密度为每100 g干土0 ~ 413只,平均109只。食菌动物、食肉动物和杂食动物是主要的营养类群。湖的东北角和东南角土壤线虫的个体密度和属数最高。大部分研究区土壤养分处于中等水平,没有人为干扰。土壤食物网的能量流倾向于通过真菌分解通道。冗余分析表明,土壤速效磷、pH、碱解氮和速效钾对土壤线虫群落有较强的影响,而全氮、有机质和含水量对土壤线虫群落的影响较小。土壤有效磷和pH值与线虫多样性呈负相关。土壤线虫呈表面聚集性;土壤食物网由于存在k -战略型生物,结构趋于复杂;湖岸生态系统处于演替后期,相对稳定。土壤有效磷含量的增加和pH值的增加对应着生物多样性的减少和土壤线虫群落的不稳定。与羌塘(或藏北)草原的高寒草甸相比,在白湖地区发现了更多的线虫多样性。
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来源期刊
Eco Mont-Journal on Protected Mountain Areas Research
Eco Mont-Journal on Protected Mountain Areas Research BIODIVERSITY CONSERVATION-ECOLOGY
CiteScore
1.20
自引率
0.00%
发文量
1
审稿时长
>12 weeks
期刊介绍: eco.mont offers a platform specifically for scientists and practitioners working in and on protected mountain areas in Europe and overseas.Target audiences of the journal are scientists from all related disciplines, managers of protected areas and an interested public including practitioners, visitors, teachers, etc.
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