草业科学2024，Vol.41Issue(7)：1558-1570,13.DOI:10.11829/j.issn.1001-0629.2023-0572
贺兰山土壤微生物生物量C、N、P化学计量特征沿海拔梯度的变化规律及其影响因素
Variation regularity of stoichiometric characteristics of soil microbial biomass C,N,and P along the altitudinal gradient and their influencing factors in Helan Mountains
摘要
Abstract
Soil microbial biomass,as the living organic matter portion of the soil,is an important ecological indicator of the flux and cycle of soil organic nutrient cycling.Investigating the vertical differentiation patterns and key influencing factors of the ecological stoichiometry characteristics of soil microbial biomass carbon(C),nitrogen(N),and Phosphorous(P)in arid and semi-arid mountainous ecosystems can provide references for understanding the processes and regulatory mechanisms of soil C,N,and P cycles in these ecosystems.This study focused on six typical zonal vegetation types at different altitudes in the Helan Mountains of Ningxia.We measured the soil microbial biomass carbon(MBC),microbial biomass nitrogen(MBN),microbial biomass phosphorus(MBP),and soil organic carbon(SOC),total nitrogen(TN),and total phosphorus(TP).Using methods such as one-way analysis of variance,redundancy analysis,and variance partitioning analysis,the vertical differentiation characteristics of the ecological stoichiometry of soil microbial biomass C,N,and P and their relationships with climatic factors and soil physicochemical factors were analyzed.The results showed that the contents of soil microbial biomass C,N,and P varied significantly with altitude(P＜0.05).MBC and MBP showed a trend of first increasing and then decreasing with increasing altitude,while MBN increased with altitude.All three elements were highest in the subalpine shrub zone,with contents of 1 502.08,35.42,and 127.55 mg·kg-1,respectively.The ratios of MBC∶MBP,MBN∶MBP,and MBC∶MBN fluctuated with altitude.MBC∶MBP and MBN∶MBP showed the highest values in the shallow mountain shrub zone.Redundancy analysis and variance partitioning analysis indicated that TN,mean annual temperature,pH,and TN:TP significantly affected the ecological stoichiometry characteristics of soil microbial biomass C,N,and P(P＜0.05).Soil physicochemical factors had a greater impact on the ecological stoichiometry characteristics of soil microbial biomass C,N,and P than did altitude and climatic factors.These results suggest that changes in soil physicochemical factors can significantly alter the ecological stoichiometry characteristics of soil microbial biomass C,N,and P.关键词
贺兰山/海拔梯度/土壤因子/土壤微生物生物量/生态化学计量特征Key words
Helan Mountains/altitude gradient/soil factor/soil microbial biomass/ecological stoichiometry characteristic引用本文复制引用
王思瑶,冯家琳,冯占荣,冯绍蕾,王玉娟,邱开阳,李小聪,邱爱珍,朱亚超,张硕,司浩宇,张焱清..贺兰山土壤微生物生物量C、N、P化学计量特征沿海拔梯度的变化规律及其影响因素[J].草业科学,2024,41(7):1558-1570,13.基金项目
宁夏自然科学基金项目(2022AAC05007) （2022AAC05007）
宁夏贺兰山自然保护区管理局资助项目(NLH2019-280-3) （NLH2019-280-3）
国家自然科学基金项目(42001095) （42001095）
