海拔对马衔山生态系统土壤-微生物碳氮磷计量特征的影响  

Effects of altitude gradient on soil microbial carbon,nitrogen and phosphorus stoichiometric characteristics in Maxian Mountain ecosystem

作　　者：李玉倩 王旭洋 林宏东 牟晓明 刘伟媛 连杰 李玉强 Li Yuqian;Wang Xuyang;Lin Hongdong;Mou Xiaoming;Liu Weiyuan;Lian Jie;Li Yuqiang(Naiman Desertification Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China;Management and Conservation Center of Xinglong Mountain National Nature Reserve,Yuzhong 730100,Gansu,China;Naiman Banner Big Willow State-owned Sand Control Forest Farm,Naiman Banner 028300,Inner Mongolia,China)

机构地区：[1]中国科学院西北生态环境资源研究院奈曼沙漠化研究站,甘肃兰州730000 [2]中国科学院大学,北京100049 [3]甘肃兴隆山国家级自然保护区管护中心,甘肃榆中730100 [4]奈曼旗大柳树国有治沙林场,内蒙古奈曼旗028300

出　　处：《中国沙漠》2025年第1期151-161,共11页Journal of Desert Research

基　　金：甘肃省自然科学基金项目(22JR5RA076);中国科学院青年创新促进会项目(2023449)。

摘　　要：为探究山地生态系统土壤-微生物碳氮磷生态化学计量特征沿海拔梯度的变化规律及其影响因素,选择马衔山沿海拔梯度的高山草原、亚高山灌丛、高山灌丛、高山草甸作为研究对象,通过测定0~20、20~40 cm层次土壤碳氮磷、微生物生物量碳氮磷和其他理化指标,分析马衔山不同海拔区域景观土壤碳氮磷、微生物生物量碳氮磷及其生态化学计量变化特征和影响因素。结果表明:(1)土壤有机碳(SOC)、全氮(TN)和全磷(TP)含量均沿海拔升高呈显著增加趋势,且随土壤深度增加显著降低,表层土壤(0~20 cm)微生物生物量碳(MBC)含量沿海拔显著增加,微生物生物量磷(MBP)含量沿海拔呈先降低后增加的趋势,深层土壤(20~40 cm)MBC含量沿海拔呈现先降低后升高的变化趋势,在亚高山灌丛达到最小值,MBP含量随海拔升高呈先上升后下降的变化趋势,并在亚高山灌丛达到最大值;(2)土壤C∶P、C∶N均沿海拔呈现先增加后减小的趋势,且最大值均出现在高山灌丛(36.16和11.88),表层土壤MBN∶MBP随海拔升高呈先增加后减小的变化趋势,在亚高山灌丛出现最大值(9.16),MBC∶MBN整体沿海拔显著增加,深层土壤MBC∶MBP随海拔升高呈先减小后增加的变化趋势,在亚高山灌丛出现最小值(8.40);(3)土壤pH、电导率、地下生物量等与土壤-微生物碳氮磷及生态化学计量显著相关,pH是土壤微生物生物量碳氮磷及其化学计量海拔分布格局的关键驱动因素。In order to investigate the changing patterns of soilmicrobial carbon,nitrogen and phosphorus ecolog-ical stoichiometry in mountain ecosystems along the altitude gradient and the factors affecting them,we selected alpine grassland(AG),subalpinescrub(SS),alpinescrub(AS)and alpinemeadow(AM)alongthealtitude gradient of the Maxian Mountains as the research objects,and analyzed the changes in the characteristics and fac-tors affecting the ecological stoichiometry of the soil carbon,nitrogen and phosphorus,microbial biomass car-bon,nitrogen and phosphorus and other physicochemical indicators at different altitudes in the landscape of Max-ian Mountains.By measuring soil carbon,nitrogen and phosphorus,microbial biomass carbon,nitrogen and phosphorus and other physicochemical indicators at 0-20 cm and 20-40 cm levels,we analyzed the characteris-tics and influencing factors of soil carbon,nitrogen and phosphorus,microbial biomass carbon,nitrogen and phosphorus and their ecological stoichiometry in the landscape of Maxian Mountain at different altitudes.The re-sults showed that:(1)soil organic carbon(SOC),total nitrogen(TN)and total phosphorus(TP)contents showed a significant increase along the altitude and decreased significantly with the increase of soil depth,the microbial biomass carbon(MBC)content of the surface soil(0-20 cm)increased significantly along the alti-tude,and microbial biomass phosphorus(MBP)content showed a decreasing and then increasing trend along al-titude,and the content of MBC in deep soil(20-40 cm)decreased first and then increased along the altitude,and reached the minimum value in the subalpine shrub,and the MBP content increased first and then decreased with the elevation,and reached the maximum value in the subalpine shrub.(2)Soil C:P and C:N showed a trend of increasing and then decreasing along the elevation,and the maximum values appeared in the alpine scrub(36.16 and 11.88),and the maximum value appeared in the alpine scrub.Surface soil MBN:MBP showed an increasing and then decreasing trend

关 键 词：海拔梯度 马衔山 土壤微生物生物量 生态化学计量 

分 类 号：S154[农业科学—土壤学]