江苏滨海湿地不同演替阶段土壤微生物生物量碳质量分数特征及其影响因素  

Characteristics and influencing factors of soil microbial biomass carbon content at different succession stages of coastal wetlands in Jiangsu Province

作　　者：何冬梅[1] 江浩[1] 祝亚云 鲁小珍 王磊[1] HE Dongmei;JIANG Hao;ZHU Yayun;LU Xiaozhen;WANG Lei(Jiangsu Academy of Forestry,Nanjing 211153,Jiangsu,China;College of Biology and the Environment,Nanjing Forestry University,Nanjing 210037,Jiangsu,China)

机构地区：[1]江苏省林业科学研究院,江苏南京211153 [2]南京林业大学生物与环境学院,江苏南京210037

出　　处：《浙江农林大学学报》2020年第4期623-630,共8页Journal of Zhejiang A&F University

基　　金：江苏省林业科学研究院青年基金(JAF-2016-02);江苏省农业科技自主创新基金(CX(19)3100);江苏盐城滨海湿地生态系统国家定位观测研究站运行补助资助项目(2019132043);江苏省青年基金(BK20141040)。

摘　　要：【目的】研究江苏滨海湿地土壤微生物生物量碳(MBC)质量分数在不同演替阶段的分布特征和季节动态,揭示其主要影响因素。【方法】选择江苏滨海湿地典型演替序列的不同阶段,光滩、大米草Spartina anglica群落、碱蓬Suaeda glauca群落、芦苇Phragmites australis群落和刺槐Robinia pseucdoacacia群落为研究对象,分析植被演替、土层和季节因素对土壤微生物生物量碳质量分数的影响,以及土壤微生物生物量碳质量分数与土壤理化性质的关系,探讨影响滨海湿地土壤微生物生物量碳质量分数的关键因素。【结果】土壤微生物生物量碳质量分数范围为116.91~326.18 mg·kg^-1,不同演替阶段之间差异显著,但分布趋势与演替方向不一致,从高到低依次为大米草群落、芦苇群落、光滩、碱蓬群落、刺槐群落。在0~10 cm土层,大米草群落土壤微生物生物量碳质量分数在4个季节均显著大于其他演替阶段。不同演替阶段的土壤微生物生物量碳质量分数在3个土层均表现出随季节先增加再下降的季节变化趋势,在秋季达到峰值,而在春季或冬季则较低。滨海湿地土壤微生物生物量碳受季节和演替阶段影响较显著,其中季节因素的影响力比例最大,占32.29%。土壤微生物生物量碳质量分数与土壤总有机碳、总氮和土壤含水率之间呈显著正相关关系,而与土壤pH呈极显著的负相关关系。【结论】植被演替和季节是影响江苏滨海湿地土壤微生物生物量碳分布和动态特征的主要因素,其中季节因素的影响力最大,土壤有机质、含水率和pH是直接影响土壤微生物活性的关键性因子。图1表2参35 。[Objective]The objective is to explore distribution characteristics and seasonal variations of soil microbial biomass carbon(MBC)content at different succession stages of coastal wetlands in Jiangsu Province,and to reveal its main influencing factors.[Method]Five typical succession stages of coastal wetlands in Jiangsu were selected as the research objects,including coastal mudflats,Spartina auglica wetland,Suaeda glauca wetland,Phragmites australis wetland,and Robinia pseucdoacacia forest.The distribution characteristics of soil MBC at the different succession stages,the effects of vegetation succession,soil layer and season on MBC,the relationship between soil MBC and soil physical and chemical properties were analyzed.The key factors affecting soil MBC in coastal wetlands were discussed.[Result]Soil MBC content ranged from 116.91 to 326.18 mg·kg^-1,with a significant difference between different succession stages,but the distribution trend was not consistent with the succession direction.The highest was Sp.auglica,followed by P.australis,coastal mudflats,Su.glauca,and R.pseucdoacacia.In 0-10 cm soil depth,soil MBC content in Sp.auglica wetland was significantly higher than that of other succession stages in four seasons.Soil MBC content at different succession stages first increased and then decreased with variation of seasons in the three soil layers,reaching its peak in autumn but lower in spring or winter.Soil MBC in coastal wetlands was significantly affected by seasons and succession stages,among which the seasonal factors had the largest impact,accounting for 32.29%.There existed a significant positive correlation between soil MBC content and total organic carbon,total nitrogen and soil moisture content,but a significant negative correlation with soil p H.[Conclusion]Vegetation succession and seasons are the main factors affecting the distribution and dynamic characteristics of soil MBC in coastal wetlands,among which seasonal factors have the greatest influence,and soil organic matter,moisture content

关 键 词：滨海湿地 微生物生物量碳 植被演替 季节动态 江苏 

分 类 号：S714.5[农业科学—林学]