南京林业大学学报（自然科学版）2025，Vol.49Issue(3)：33-40,8.DOI:10.12302/j.issn.1000-2006.202311030
干旱对杨树人工林土壤微生物生物量碳氮磷生态化学计量特征的影响
Effects of drought on the soil microbial biomass C,N,P ecological stoichiometric characteristics of poplar plantation
摘要
Abstract
[Objective]This study aimed to reveal the effects of drought on soil microbial biomass carbon(C),nitrogen(N),and phosphorus(P),as well as their ecological stoichiometric characteristics in poplar plantations.We also aimed to understand the soil C,N,and P biogeochemical cycles in poplar plantations under a future global drought scenario and provide a theoretical basis for the rational management of these plantations.[Method]Soil microbial biomass C(MBC),N(MBN)and P(MBP),along with their ecological stoichiometric characteristics(i.e.,MBC/MBN,MBC/MBP,and MBN/MBP),and soil physicochemical properties,were examined in a poplar plantation(Populus deltoides)at Dongtai Forest Farm,Jiangsu Province,China.Three treatments were established in this study,control(CK),30％ throughfall reduction(D1),and 50％ throughfall reduction(D2).[Result](1)Soil MBC,MBN,and MBP were significantly reduced under drought conditions compared to the control,with reductions of 16.09％,22.60％,and 32.49％,respectively,for the D2 treatment.Both MBC/MBN and MBC/MBP were significantly increased under drought conditions,with increases of 10.33％and 25.15％,respectively,in the D2 treatment,while soil MBN/MBP ratios did not change significantly.(2)Soil MBC,MBN and MBP showed significant seasonal variations,ranging from 344.67 to 500.12 mg/kg,45.21 to 63.22 mg/kg,and 15.33 to 23.48 mg/kg,respectively.MBC,MBN,and MBP contents were lower in summer and fall than in winter and spring.In contrast,seasonal variations in MBC/MBN and MBC/MBP showed opposite trends to those of MBC,MBN,and MBP,while seasonal variations in MBN/MBP were not significant.(3)Compared with the control,drought treatments significantly reduced NH4+-N,dissolved organic carbon(DOC),available phosphorus(AP),and soil water content(SWC)by 68.81％,32.77％,29.87％,and 11.05％,respectively.Drought treatments increased soil pH and NO3--N content by 1.51％and 194.34％,respectively.Correlation analyses showed that soil MBC,MBN,and MBP had highly significant positive correlations with SWC and total nitrogen(TN)and significant or highly significant negative correlations with SOC,NO3--N content,and the total carbon to nitrogen ratio(C/N).Soil MBC/MBN,MBC/MBP,and MBN/MBP showed significantly or highly significant positive correlations with NO3--N and C/N and significant or highly significant negative correlations with SWC and TN content.[Conclusion]Drought significantly affected soil microbial C,N,and P and their ecological stoichiometric characteristics in poplar plantations,potentially altering the soil nutrient balance and cycling in these plantations.关键词
杨树人工林/土壤微生物/干旱/生态化学计量特征/季节变化Key words
soil microbes/drought/ecological stoichiometric characteristics/popular plantation/seasonal variation分类
林学引用本文复制引用
赵紫薇,阮宏华,杨艳,谢友超,沈彩芹,徐亚明,曹国华..干旱对杨树人工林土壤微生物生物量碳氮磷生态化学计量特征的影响[J].南京林业大学学报（自然科学版）,2025,49(3):33-40,8.基金项目
国家重点研发计划(2021YFD2200403) （2021YFD2200403）
国家自然科学基金项目(32071594) （32071594）
江苏省林业局揭榜挂帅项目(LYKJ[2022]01) （LYKJ[2022]01）
江苏林业局造林专项项目([2021-2022]). （[2021-2022]）
