民勤荒漠区不同植物群落土壤微生物生物量碳氮及生态化学计量特征  

Characterization of soil microbial biomass carbon and nitrogen and ecological stoichiometry in different plant communities in Minqin desert area

作　　者：汤萃文[1] 王瑛瑛 李春霖 张玉霞 郑传贺 苏艳斌 TANG Cuiwen;WANG Yingying;LI Chunlin;ZHANG Yuxia;ZHENG Chuanhe;SU Yanbin(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《林业与生态科学》2024年第2期190-196,共7页Forestry and Ecological Sciences

基　　金：甘肃省科技计划(22JR5RA328);甘肃省科技厅重点研发项目(18YF1NA015)。

摘　　要：以甘肃民勤连古城荒漠区5种典型植物群落为对象,测定了土壤微生物生物量碳(MBC)和土壤微生物生物量氮(MBN)及其影响因素,分析土壤MBC、MBN的空间变化特征。结果表明:(1)不同植物群落间,土壤MBC的最大值出现在红砂群落(282.90 mg/kg),土壤MBN最大值出现在膜果麻黄群落(28.27 mg/kg)。(2)不同植物群落间,白刺群落的微生物量熵(qMB)最大,最小值出现在人工梭梭群落,5种植物群落间土壤qMB差异不显著。土壤微生物生物量碳氮比(MBC/MBN)的最大值出现在白刺群落,显著高于膜果麻黄群落和人工梭梭群落。(3)土壤MBC、MBN与生态化学计量之间存在相关关系。其中,土壤MBC与土壤全氮(TN)和有效磷(EP)呈显著正相关(P<0.05),与土壤硝态氮(NO_(3)^(-)-N)和含水率(WC)呈极显著正相关(P<0.01)。土壤MBN与土壤WC显著正相关(P<0.05),与土壤EP和速效钾(AK)呈极显著正相关(P<0.01),与土壤TN、NO_(3)^(-)-N呈正相关,且相关性达到极显著水平(P<0.001)。冗余分析进一步显示,NO_(3)^(-)-N和TN是影响土壤MBC、MBN的主要因子。综上所述,不同植物群落间土壤MBC、MBN不同,以红砂群落和膜果麻黄群落最为显著;土壤TN、EP、土壤NO_(3)^(-)-N和WC是影响土壤MBC的主要因子,土壤WC、土壤EP、AK、土壤TN和NO_(3)^(-)-N是影响土壤MBN的主要因子。In order to explore the effects of spatial distribution of different plant communities on soil nutrients and microorganisms in Minqin desert area,soil microbial biomass carbon(MBC)and soil microbial biomass nitrogen(MBN)and their influencing factors were measured in the above five typical plant communities in the desert area of Minqin Lian Ancient City,Gansu Province,and the spatial changes of soil MBC and MBN were analyzed.The findings demonstrated that:(1)Among various plant communities,the maximum values of the soil MBC and MBN were represented in the Reaumuria songarica community with 282.90 mg/kg and the Ephedra przewalskii community with 28.27 mg/kg respectively.(2)Among different plant communities,the value of microbial qMB in the Nitraria tangutorum community was the highest,while it was lowest in the a Haloxylon ammodendron community.However,there were no significant differences in soil qMB among these five plant communities.The maximum value of carbon-nitrogen ratio in soil microbial biomass(MBC/MBN)represented in the N.tangutorum community which was significantly higher than the E.przewalskii community and a H.ammodendron community.(3)There was a correlation between soil MBC,MBN and ecological chemistry measurements.Among them,soil MBC showed a significant positive correlation with soil TN and EP(P<0.05),as well as an extremely significant positive correlation with soil NO_(3)^(-)-N and WC(P<0.01).Soil MBN exhibited a significant positive correlation with soil WC(P<0.05),and an extremely significant positive correlation with soil EP and AK(P<0.01).Moreover,it showed a positive correlation with soil TN and NO_(3)^(-)-N,and the level reached an extremely significant level(P<0.01).The redundant analysis further revealed that the primarily influenced factors on soil MBC and MBN were NO_(3)^(-)-N and TN.Over all,the soil MBC and MBN were different in various plant communities,with notable examples being the R.songarica community and E.przewalskii community.Furthermore,the soil TN,EP,NO_(3)^(-)-N and WC were

关 键 词：土壤微生物生物量碳、氮 生态化学计量特征 荒漠植被群落 民勤荒漠区 

分 类 号：S154.36[农业科学—土壤学]