南岭山地不同海拔土壤生态化学计量特征及影响因素  

Soil Ecological Stoichiometry and Its Influencing Factors at Different Elevations in Nanling Mountains

作　　者：黄伟佳 刘春 刘岳 黄斌 李定强 袁再健 HUANG Weijia;LIU Chun;LIU Yue;HUANG Bin;LI Dingqiang;YUAN Zaijian(College of Life Science and Technology,Jinan University,Guangzhou 510632,P.R.China;National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China/Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management/Guangdong Engineering Research Center for Non-point Source Pollution Control/Institute of Eco-environmental and Soil Sciences,Guangdong Academy of Sciences,Guangzhou 510650,P.R.China;International Institute of Soil and Water Conservation,Meizhou 514000,P.R.China;Jiangxi Geological Survey and Exploration Institute,Nanchang 330201,P.R.China)

机构地区：[1]暨南大学生命科学技术学院,广东广州510632 [2]广东省科学院生态环境与土壤研究所/华南土壤污染控制与修复国家地方联合工程研究中心/广东省农业环境综合治理重点实验室/广东省面源污染防治工程技术研究中心,广东广州510650 [3]梅州市国际水土保持研究院,广东梅州514000 [4]江西省地质调查勘查院,江西南昌330201

出　　处：《生态环境学报》2023年第1期80-89,共10页Ecology and Environmental Sciences

基　　金：广东省重点研发计划项目(2020B1111530001);广东省科技计划项目(2021B1212050019,2018B030324001,2022A050509005);广东省科学院专项资金项目(2022GDASZH-2022010203,2022GDASZH-2022010105);梅州市科技计划项目(2020B0204001)。

摘　　要：土壤生态化学计量比是表征土壤养分需求与限制的重要指标。为了探究不同海拔梯度土壤生态化学计量特征,选择南岭山地不同海拔土壤为研究对象,分层采集不同海拔0—60 cm土壤,通过测定土壤基本理化性质、微生物生物量碳氮磷和土壤酶活性,分析南岭不同海拔梯度山地土壤养分、微生物生物量碳氮磷、酶活性及其生态化学计量比特征及影响因素。研究结果表明:(1)土壤有机碳(TOC)、总氮(TN)、总磷(TP)、微生物量氮(MBN)、微生物量磷(MBP)含量和β-葡萄糖苷酶(BG)活性在中高海拔处高于低海拔处,而微生物量碳(MBC)含量、N-乙酰-β-氨基葡萄糖苷酶(NAG)和酸性磷酸酶(AP)活性沿海拔呈现波动变化,其中MBC含量,NAG和AP活性分别在402、809和402 m处到达最高;(2)土壤^(w)(C)/^(w)(N)、^(w)(MBC)/^(w)(MBN)、^(w)(MBC)/^(w)(MBP)、^(w)(MBN)/^(w)(MBP)、NAG:AP均在809m处最高,土壤^(w)(C)/^(w)(P)、^(w)(N)/^(w)(P)、BG:AP均在1 364 m处最高,土壤BG:NAG在1 536 m处最高;(3)土壤含水率、TOC、TN分别解释了土壤各化学计量比的25.0%、17.9%、13.6%。其中,含水率与^(w)(N)/^(w)(P)显著正相关(P<0.05),与BG:NAG极显著正相关(P<0.01),与^(w)(MBC)/^(w)(MBP)、NAG:AP极显著负相关(P<0.01),与^(w)(MBN)/^(w)(MBP)显著负相关(P<0.05);TOC与^(w)(C)/^(w)(P)、^(w)(N)/^(w)(P)、BG:AP极显著正相关(P<0.01);TN与^(w)(N)/^(w)(P)极显著正相关(P<0.01),与^(w)(C)/^(w)(P)、BG:NAG、BG:AP显著正相关(P<0.05),与^(w)(C)/^(w)(N)显著负相关(P<0.05)。南岭山地土壤养分、微生物量、酶活性化学计量比有明显的海拔梯度变化特征,土壤理化性质对土壤化学计量比具有重要的影响,对于深入研究南岭山地土壤养分平衡状况和限制因素具有重要的意义。Soil ecological stoichiometry is an important index to characterize soil nutrient requirement and limitation.In order to explore the ecological stoichiometry characteristics of soils at different altitude gradients,soils at different altitudes in Nanling Mountains were selected as the research objects.The soils(0–60 cm)at different altitudes were stratified and collected.The characteristics of soil nutrients,microbial biomass C,N,P,enzyme activities and their ecological stoichiometric ratios and the influencing factors in different elevation gradients of Nanling mountains were analyzed.The results show that꞉(1)The contents of soil organic carbon(TOC),total nitrogen(TN),total phosphorus(TP),microbial biomass nitrogen(MBN),microbial biomass phosphorus(MBP)andβ-glucosidase(BG)activity were higher at middle and high altitudes than at low altitudes.The microbial biomass carbon(MBC)content,N-1,4-acetyl-β-glucosaminidase(NAG)and acid phosphatase(AP)activities fluctuated along the altitude,and the MBC content,NAG activity and AP activity was highest at 402 m,809 m and 402 m,respectively.(2)Soil ^(w)(C)/^(w)(N),^(w)(MBC)/^(w)(MBN),^(w)(MBC)/^(w)(MBP),^(w)(MBN)/^(w)(MBP),NAG꞉AP were the highest at 809 m,soil ^(w)(C)/^(w)(P),^(w)(N)/^(w)(P),BG꞉AP were the highest at 1364 m,and soil BG꞉NAG was the highest at 1536 m.(3)Soil moisture content,TOC and TN accounted for 25.0%,17.9%and 13.6%of soil stoichiometric ratios,respectively.Water content was significantly positively correlated with ^(w)(N)/^(w)(P)(P<0.05),was very significantly positively correlated with BG꞉NAG(P<0.01)and very significantly negatively correlated with ^(w)(MBC)/^(w)(MBP)and NAG꞉AP(P<0.01)and significantly negatively correlated with ^(w)(MBN)/^(w)(MBP)(P<0.05);TOC was very significantly positively correlated with ^(w)(C)/^(w)(P),^(w)(N)/^(w)(P),BG꞉AP(P<0.01);TN was very significantly positively correlated with ^(w)(N)/^(w)(P)(P<0.01),was significantly positively correlated with ^(w)(C)/^(w)(P)、BG꞉NAG,BG꞉AP(P<0.05)and significantly neg

关 键 词：南岭山地 海拔 养分 微生物量碳氮磷 土壤酶 化学计量 

分 类 号：S154.1[农业科学—土壤学] X171.1[农业科学—农业基础科学]