摘要
揭示土壤和微生物碳氮磷(C∶N∶P)化学计量的空间格局及其影响因素,对生态系统功能调控和全球气候变化应对具有重要意义。本研究通过在科尔沁沙地开展区域野外调查,应用地统计学方法,构建随机森林模型量化科尔沁沙地土壤微生物C∶N∶P化学计量空间分布的驱动因素。结果表明:土壤微生物碳氮磷(MBC、MBN、MBP)含量低值区主要位于科尔沁沙地中部,高值区主要位于科尔沁沙地北部的大兴安岭余脉。自南向北方向,MBC∶MBP和MBN∶MBP逐渐升高。科尔沁沙地MBC∶MBN为0.63~28.29(平均值为7.3);MBC∶MBP为0.35~91.27(平均值为11.26);MBN∶MBP为0.07~10.16(平均值为1.56),均低于全球及中国的化学计量比,整体表现出碳、氮、磷元素限制,MBC和MBN含量是影响科尔沁沙地土壤微生物量C∶N∶P空间变异的最主要因素。
Understanding the spatial pattern of soil and microbial carbon,nitrogen and phosphorus(C∶N∶P)stoichiometry and its drivers are important for regulating ecosystem function and responding to global climate change.In this study,we applied geostatistical methods and constructed a random forest model to quantify the drivers of the spatial distribution of soil and microbial C∶N∶P stoichiometry in the Horqin Sandy Land through a regional field survey.The results showed that low-value zones for soil microbial carbon(MBC),nitrogen(MBN)and phosphorus(MBP)were primarily located in the central part of the Horqin Sandy Land.In contrast,high-value zones were mainly found in the northern part of the Horqin Sandy Land,specifically in the foothills of the Greater Khingan Mountains.The ratios of MBC∶MBP and MBN∶MBP gradually increased from south to north.In the Horqin Sandy Land,the MBC∶MBN ratio ranged from 0.63 to 28.29(average:7.3),the MBC∶MBP ratio from 0.35 to 91.27(average:11.26),and the MBN∶MBP ratio from 0.07 to 10.16(average:1.56).These values were all lower than the global and Chinese stoichiometric ratios.Overall,the region exhibited limitations in C,N and P,with MBC and MBN content primarily influencing the spatial variation of soil microbial biomass C∶N∶P in the Horqin Sandy Land.
作者
姚博
连杰
龚相文
牟晓明
李玉霖
李玉强
王旭洋
Bo Yao;Jie Lian;Xiangwen Gong;Xiaoming Mou;Yulin Li;Yuqiang Li;Xuyang Wang(State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;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;School of Geographical Sciences/Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station,Southwest University,Chongqing 400715,China)
出处
《中国沙漠》
北大核心
2025年第4期153-165,共13页
Journal of Desert Research
基金
国家自然科学基金:项目(32001214)
中国科学院青年创新促进会项目(2023449)。
关键词
土壤碳氮磷
土壤微生物生物量
生态化学计量
空间格局
科尔沁沙地
soil carbon
nitrogen and phosphorus
soil microbial biomass
ecological stoichiometry
spatial pattern
Horqin Sandy Land
作者简介
姚博(1989-),男,甘肃靖远人,博士,主要从事沙地土壤养分循环方面的研究。E-mail:yaobo@nieer.ac.cn;通信作者:王旭洋(E-mai:xuyangwang@.lzb.ac.cn)。
