Response of Soil Nematode Communities to Simulated Warming in an Alpine Meadow in Northern Tibet

A Qiong; BU Duo; HOU Lei; ZHAO Jinyi; MANG Yangdan; YUAN Min; WANG Weiwei; XUE Huiying

doi:10.19672/j.cnki.1003-6504.2334.22.338

Abstract：In order to understand the effects of climate warming on soil nematode communities in the alpine meadow of northern Tibet,a 3-year simulated warming experiment was conducted in the alpine meadow plot of Nagqu Ecological Envi-ronment Comprehensive Observation and Research Station of Tibet University-Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Nagqu County,Tibet.The results showed that warming decreased soil nematode density,increased soil evenness(J'),and changed the spatial distribution and seasonal dynamics of soil nematode communities.At the same time,warming also changed the species composition of soil nematode community.Genera such as Longidorella emerged after warming,while genera such as Nothotylenchus were more sensitive to heat and disappeared after warming.Shannon-Weiner diversity index(H')showed no significant change in biodiversity under simulated warming conditions.Warming resulted in an increase in phytophagous nematode bacteriophagous nematode species,a decrease in omnivorous/predatory nematode species,and no change in fungal nematode species.The change of community structure led to the change of ecosystem function.NCR values showed that warming promoted the degradation channel of soil organic matter dominated by bacteria.The trend of in-creasing MI value and decreasing PPI indicated that the adaptive ability of soil nematode community was gradually enhanced after the disturbance of warming,and the alpine meadow ecosystem tended to be more stable.The results can provide a refer-ence for exploring the effects of climate change on soil processes in grassland ecosystems of the Tibetan Plateau.