Abstract:

Soil nematodes play an important role in indicating the structure and function of alpine meadow ecosystems, yet the impact of plant functional group loss on soil nematode communities remains unclear. In this study, five treatments involving the removal of above-ground plant functional groups were established in an alpine meadow ecosystem of the eastern Qinghai-Tibet Plateau, including a control (CK), graminoids, legumes, forbs, and remove all. The aim was to explore the impact of plant functional group loss on soil nematode communities. Results showed that: (1) Above-ground removal of plant functional groups had no significant effect on plant root biomass and soil nematode total density. (2) Above-ground removal of plant functional groups had a significant effect on the relative abundance of nematode trophic taxa. Under legume treatment, the relative abundance of bacterial feeder nematodes was the highest, while that of plant parasite nematodes was the lowest; under forbs treatment, the relative abundance of plant parasite nematodes was the highest, while that of bacterial feeder nematodes was the lowest. (3) Nonmetric multidimensional-scaling analysis (NMDS) showed that the removal of different plant functional groups led to differences in soil nematode taxa, with significant impact on soil nematode community structure.

摘要：

土壤线虫对高寒草甸生态系统功能有重要的指示作用，植物功能群丧失对土壤线虫群落的影响尚不清楚。本研究在青藏高原东部的高寒草甸生态系统中设置对照、保留豆科、保留禾状草、保留非豆科杂类草和去除所有植物功能群5个处理的地上部植物功能群去除实验，以探究植物功能群损失对土壤线虫群落的影响。结果显示：（1）去除植物功能群地上部对植物根系生物量和土壤线虫总密度影响不显著。（2）去除植物功能群地上部对线虫不同营养类群相对丰度影响显著。保留豆科处理下，食细菌线虫相对丰度整体最高，而植物寄生线虫相对丰度最低；保留杂类草处理下，植物寄生线虫相对丰度整体最高，而食细菌线虫相对丰度最低。（3）非度量多维尺度分析（NMDS）结果表明，去除不同植物功能群会导致土壤线虫类群产生差异，对土壤线虫群落结构产生显著影响。