永德大雪山常绿阔叶林沿海拔梯度土壤微生物残体变化  

Change in soil microbial necromass in a broad⁃leaved evergreen forest along altitudinal gradient in Yongde Snow Mountain,southwest Yunnan

作　　者：徐凡迪 杨玉春 陈燕旋 李聪 吴疆翀[1] Wang Tongli 李帅锋[1] 苏建荣[1] XU Fandi;YANG Yuchun;CHEN Yanxuan;LI Cong;WU Jiangchong;WANG Tongli;LI Shuaifeng;SU Jianrong(Institute of Highland Forest Science,Chinese Academy of Forestry,Kunming 650224,China;Lincang Academy of Forestry,Lincang 677000,Yunnan,China;Faculty of Forestry,The University of British Columbia,Vancouver,BC Canada,V6T1Z4)

机构地区：[1]中国林业科学研究院高原林业研究所,昆明650224 [2]临沧市林业科学院,云南临沧677000 [3]Faculty of Forestry,The University of British Columbia,Vancouver,BC Canada,V6T1Z4

出　　处：《生态学杂志》2024年第12期3587-3594,共8页Chinese Journal of Ecology

基　　金：云南省中青年学术与技术后备人才计划(202105AC160036);中央级公益性科研院所基本科研业务费专项资金(CAFYBB2020ZA002,CAFYBB2021ZA002)资助。

摘　　要：微生物残体是土壤有机碳(SOC)的重要来源,但微生物残体沿海拔梯度的变化规律还需进一步探讨。本研究以云南省永德大雪山常绿阔叶林为对象,分析了3个海拔段(1200、1700和2200 m)表层(0~20 cm)土壤理化性质、微生物残体以及林分特征等差异,揭示沿海拔梯度常绿阔叶林土壤微生物残体碳积累的调控机制。结果表明,常绿阔叶林总微生物残体为15.36 g·kg^(-1),对SOC的贡献为24.09%,真菌残体对SOC的贡献(20.36%)高于细菌残体(3.73%)。真菌、细菌及总微生物残体沿海拔升高呈增大趋势,而真菌和总微生物残体对SOC的贡献沿海拔升高无显著变化。木本植物组成对真菌和总微生物残体有显著影响。微生物残体随土壤养分增大而显著增加,随木本植物丰富度增大而显著降低,较高的SOC、全氮、速效氮和含水量以及较低的土壤pH促进了微生物残体的积累。土壤养分、海拔和木本植物多样性是微生物残体积累的重要影响因素。综上,微生物残体沿海拔升高而增加,但其对SOC的贡献并无显著变化。Microbial necromass plays an important role in the formation of soil organic carbon(SOC).However,the change of microbial necromass along altitudinal gradient remains unclear.In this study,we analyzed the differ⁃ences of soil physicochemical properties,microbial necromass(topsoil 0-20 cm),and stand characteristics along an altitudinal gradient(1200,1700,and 2200 m)in a broad⁃leaved evergreen forest in Yongde Snow Mountain,Yunnan Province,aiming to reveal the regulatory mechanism of microbial necromass accumulation along the altitu⁃dinal gradient.The results showed that microbial necromass was 15.36 g·kg^(-1)in the broad⁃leaved evergreen forest and that its contribution to SOC was 24.09%.The contribution of fungal necromass to SOC(20.36%)was higher than that of bacterial necromass(3.73%).Fungal,bacterial,and microbial necromass increased significantly with increasing altitude.There was no significant difference in the contribution of fungal and microbial necromass to SOC along the altitudinal gradient.In addition,woody species composition showed significant effects on fungal and mi⁃crobial necromass.Microbial necromass increased with increasing soil nutrients,but increased significantly with de⁃creasing woody species richness.Furthermore,higher SOC,soil total nitrogen,soil available nitrogen,and soil wa⁃ter content,and lower soil pH could promote the accumulation of microbial necromass.Soil nutrient,altitude,and woody species diversity were the important factors affecting microbial necromass.Therefore,altitude promoted the accumulation of microbial necromass but did not increase its contribution to SOC.

关 键 词：氨基糖 真菌残体 细菌残体 土壤有机碳 木本植物多样性 海拔 

分 类 号：S714.3[农业科学—林学]