凋落物输入对刺槐林土壤线虫群落结构和代谢足迹的影响  

Effects of litter inputs on soil nematode community structure and metabolic footprint in a Robinia pseudoacacia forest

作　　者：施赟 樊晓婧 刘俊利 张若冰 贺雨轩 付鑫磊 何长江 凡转转 何京隆 刘梦舟 王冬 SHI Yun;FAN Xiaojing;LIU Junli;ZHANG Ruobing;HE Yuxuan;FU Xinlei;HE Changjiang;FAN Zhuanzhuan;HE Jinglong;LIU Mengzhou;WANG Dong(School of Life Sciences,Henan University,Kaifeng 475004,China;The College of Geography and Environmental Science,Henan University,Kaifeng 475004,China;Henan Dabieshan National Field Observation and Research Station of Forest Ecosystem,Kaifeng 475004,China)

机构地区：[1]河南大学生命科学学院,开封475004 [2]河南大学地理与环境学院,开封475004 [3]河南大别山森林生态系统国家野外科学观测研究站,开封475004

出　　处：《生态学报》2024年第24期11276-11285,共10页Acta Ecologica Sinica

基　　金：国家自然科学基金(32371672);河南省自然科学基金(242300421102,222300420110)。

摘　　要：线虫是经典的土壤健康指示生物。研究选取黄土高原刺槐人工林,探究去除与添加刺槐凋落物对土壤线虫群落结构及代谢足迹的影响,旨在为西北地区人工林的可持续管理提供科学依据。结果表明:凋落物输入显著改变了线虫丰度、生态指数和代谢足迹。与对照相比,三倍凋落物处理下线虫丰度显著提高了76.25%,线虫丰富度指数显著降低了27.11%(P<0.05)。随着凋落物输入的增加,成熟度指数、瓦斯乐斯卡指数、线虫复合代谢足迹和食真菌线虫代谢足迹显著提高,而植物寄生线虫相对丰度、植物寄生线虫指数显著降低(P<0.05)。冗余分析表明,微生物生物量碳、速效氮、可溶性有机碳是影响线虫群落的重要环境因子。研究表明刺槐凋落物的大量输入使线虫食物资源单一化,降低了线虫的物种多样性。然而,凋落物输入为线虫提供了充足的有机质资源及适宜的土壤生境,利于线虫丰度增加及代谢活性的提升,同时通过抑制植物寄生线虫生长繁殖,削弱了植物寄生线虫对生态系统的侵害强度,利于土壤健康。Nematodes are recognized as key indicators of soil health and essential components of soil food webs.Litter input serves as the primary energy and nutrient source for the soil food webs.Global climate change has significantly affected the quantity of plant litter input in recent years.This study,conducted from January 2018 to May 2023,explored the effects of litter removal and addition on the community structure and metabolic footprint of soil nematodes in a Robinia pseudoacacia forest on the Loess Plateau.The aim was to provide a scientific foundation for the sustainable management of artificial forests in the northwest region under future climate scenarios.This experiment included four treatments:no litter,natural litter,double litter,and triple litter input.The results showed that litter input significantly affected the abundance,ecologicalindexes,and metabolic footprint of soil nematodes.Under the triple litter treatment,the abundance of soil nematode reached1705 nematodes per 100 g dry soil,which was the highest among the four treatments.Compared to the control treatment,thenematode abundance increased significantly by 76.25%,while the species richness index decreased by 27.11%under thetriple litter treatment(P<0.05).The maturity index,Wasilewska index,total nematode metabolic footprint,and fungivoresmetabolic footprint significantly increased with the amount of litter,while the relative abundance of plant parasiticnematodes and the plant parasitic index decreased(P<0.05).Correlation analysis revealed that the abundance of soilnematodes and the total nematode metabolic footprint were significantly positively correlated with soil water content.Thespecies richness index was negatively correlated with soil microbial biomass carbon content.Additionally,the relativeabundance of plant parasitic nematodes and the plant parasitic index were negatively correlated with dissolved organic carboncontent.Redundancy analysis indicated that soil microbial biomass carbon content,available nitrogen,and dissolved organiccarbon

关 键 词：凋落物输入 土壤线虫群落 代谢足迹 刺槐人工林 

分 类 号：S714.3[农业科学—林学]