江苏滨海湿地土壤可溶性有机碳的分布和季节动态  

Distribution and seasonal dynamics of soil dissolved organic carbon in coastal wetlands of Jiangsu Province

作　　者：何冬梅[1] 王琳飞 祝亚云 江浩[1] He Dongmei;Wang Linfei;Zhu Yayun;Jiang Hao(Jiangsu Academy of Forestry, Nanjing 211153,China;Guangrao County Sub-Bureau of Dongying Ecological Environment Bureau, Dongying 257300, China)

机构地区：[1]江苏省林业科学研究院,江苏南京211153 [2]东营市生态环境局广饶县分局,山东东营257300

出　　处：《江苏林业科技》2020年第3期11-15,共5页Journal of Jiangsu Forestry Science & Technology

基　　金：江苏省农业科技自主创新资金项目“提升江苏淤泥质滩涂湿地固碳能力的植被恢复模式研究”(CX(19)3100);江苏省林业科学研究院青年基金项目“滨海湿地不同生态演替阶段土壤有机碳化学结构特征”(JAF-2016-02);江苏省自然科学基金青年基金项目“江苏滨海湿地生态演替序列温室气体通量及影响因子研究”(BK20141040);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(2019132043)。

摘　　要：通过研究滨海湿地土壤可溶性有机碳(DOC)的分布和季节变化,为揭示其在碳循环中的作用提供理论依据。以江苏滨海湿地典型植被群落(光滩、米草群落、碱蓬群落、芦苇群落和刺槐群落)为研究对象,分析了湿地不同植被群落DOC含量的水平分布和垂直分布情况以及季节变化规律,并且探讨了土壤DOC与土壤性质的关系。结果表明:在水平方向上,江苏滨海湿地土壤DOC含量分布表现为大米草群落在3个研究土层均大于其他植被群落,这主要是由于大米草群落能够产生大量有机质,有机质进入到土壤中,经微生物转化形成DOC;在垂直剖面上,除碱蓬群落外,其余植被群落土壤DOC含量最大值均出现在表层,这是因为DOC来源的有机质首先进入表层土壤。土壤DOC含量受季节因素影响较大,不同植被群落土壤DOC动态表现出了相似的季节变化规律,均表现为从春季到秋季逐渐增加,在秋季达到峰值,然后在秋季到冬季的过程中逐渐降低。相关性分析显示,土壤DOC与土壤总有机碳、总氮以及微生物生物量碳(MBC)之间均呈极显著的正相关;土壤pH与DOC之间表现出极显著的负相关。说明滨海湿地土壤性质与其DOC分布和动态密切相关。The distribution and seasonal dynamics of soil dissolved organic carbon(DOC)were studied to reveal the role of DOC in carbon cycle in coastal wetlands.The vertical and horizontal distribution and the seasonal dynamics of soil DOC under the different vegetation communities(coastal mudflats,Spartina auglica community,Suaeda glauca community,Phragmites australis community,and Robinia pseucdoacacia community)were determined,and the relationship between soil DOC and soil properties was also discussesd.The distribution of soil DOC content of coastal wetlands in Jiangsu Province was showed as follows:horizontally in the all soil layers,the content of soil DOC in Spartina auglica community was higher than that in other vegetation communities because Spartina auglica community could produce a large amount of organic matter into the soil and form DOC through microbial transformation.In the vertical profile,the maximum content of DOC was determined in the surface layer soil of the vegetation communities(except the Suaeda glauca community)because the organic matter as the source of DOC first entered the surface soil.The soil DOC of the different vegetation communities showed consistent seasonal variation trend,that was,gradual increase from spring to autumn,and then gradual decrease from autumn to winter.The correlation analysis showed that soil DOC was positively correlated with soil total organic carbon,total nitrogen and microblal biomass carbon(MBC)while soil pH was negatively correlated with DOC,indicating that the soil properties were closely related to the distribution and dynamics of soil DOC in coastal wetlands.

关 键 词：滨海湿地 土壤 可溶性有机碳 微生物生物量碳 季节动态 江苏省 

分 类 号：S153.6[农业科学—土壤学]