Characterization of soil microbial biomass carbon and nitrogen and ecological stoichiometry in different plant communities in Minqin desert area
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 meas-ured 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 artificial 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 artificial 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 NO3-—N and WC(P＜0.01).Soil MBN exhibited a significant positive correlation with soil WC(P＜0.05),and an ex-tremely significant positive correlation with soil EP and AK(P＜0.01).Moreover,it showed a positive correlation with soil TN and NO3—N,and the level reached an extremely significant level(P＜0.01).The redundant analysis further revealed that the primarily in-fluenced factors on soil MBC and MBN were NO3-—N and TN.Over all,the soil MBC and MBN were different in various plant communities,with notable examples being the R.son-garica community and E.przewalskii community.Furthermore,the soil TN,EP,NO3—N and WC were the main influencing factors of soil MBC,while soil WC,EP,AK,TN and NO3-—N were the major influencing factors of soil MBN.
soil microbial mass carbon and nitrogenecological stoichiometric characteristicsdesert vegetation communitiesMinqin desert area
NETL
NSTL
万方数据
