清澜港红树林湿地典型群落类型沉积物活性有机碳组分分布特征  

Distribution characteristics of active organic carbon components in sediments of typical community types of mangrove wetland in Qinglan Port

作　　者：陈小花 陈宗铸 雷金睿 吴庭天 李苑菱 CHEN Xiaohua;CHEN Zongzhu;LEI Jinrui;WU Tingtian;LI Yuanling(Hainan Academy of Forestry(Hainan Academy of Mangrove),Haikou 571100,China;Hainan Key Laboratory of Monitoring and Application of Tropical Forestry Resources(Plan),Haikou 571100,China;Haikou Wetland Protection Engineering Technology Research and Development Center,Haikou 571100,China)

机构地区：[1]海南省林业科学研究院(海南省红树林研究院),海口571100 [2]海南省热带林业资源监测与应用重点实验室(筹),海口571100 [3]海口市湿地保护工程技术研究开发中心,海口571100

出　　处：《生态学报》2022年第11期4572-4581,共10页Acta Ecologica Sinica

基　　金：省属科研院所技术创新专项项目(jscx202023);海南省科研院所技术创新专项基础性科研工作(jcxk202003)。

摘　　要：滩涂海岸红树林生态系统通常具有较高的土壤养分,尤其是沉积物有机碳含量。海南岛红树林种类丰富且生长较好,通过对红树林沉积物有机碳组分的基础研究有利于提高对红树林湿地固碳能力的评估精度,加深对海洋蓝碳的认识。以清澜港红树林5种典型群落类型为对象,比较分析表层土壤(0-10 cm)总有机碳(TOC)、微生物生物量碳(MBC)、易氧化有机碳(EOC)、可溶性有机碳(DOC)含量差异及其与土壤因子之间的相关性。结果表明:(1)不同群落类型间,土壤TOC、MBC、DOC和EOC含量均值分别为66.76 g/kg、177.08 mg/kg、25.49 mg/kg和2.34 g/kg。对比发现,土壤TOC在角果木群落中含量最高,但各群落间无显著差异;土壤MBC在不同群落间存在显著差异,其中角果木群落和杯萼海桑群落显著高于榄李群落;土壤DOC在不同群落间存在显著差异,其中海莲群落和角果木群落显著高于其余群落;土壤EOC在不同群落间存在显著差异,其中角果木群落显著高于海莲群落和正红树群落。(2)活性有机碳各个组分占总有机碳的比例均值大小依次为EOC>MBC>DOC。土壤EOC、MBC、DOC的分配比例分别介于3.23%-4.02%、0.22%-0.36%、0.02%-0.08%之间。(3)冗余分析表明,土壤TN对土壤有机碳组分含量的单独解释率最高。土壤pH在土壤的单独解释率最低,其对土壤有机碳组分含量影响较小。(4)土壤TOC、MBC、DOC、EOC与土壤TN、含水量(SWC)呈极显著正相关。综上所述,潮位以及不同群系类型引起的土壤理化性质共同影响着土壤活性有机碳组分的浓度。Mangrove ecosystems in tidal flats usually contain a large proportion of soil nutrients,especially organic carbon content in sediments.The basic research on organic carbon components of the sediments in the large variety of luxuriant mangrove forests in Hainan Island can help more accurately evaluate the carbon sequestration capacity of mangrove wetlands and improve the knowledge about marine blue carbon.This paper comparatively analyzes the different contents of total organic carbon(TOC),microbial biomass carbon(MBC),easily oxidized organic carbon(EOC),and dissolved organic carbon(DOC)in the topsoil(0-10 cm)in five typical populations of mangrove in Qinglan Port and their correlation with soil factors.The result shows that(1)the average contents of TOC,MBC,DOC and EOC in the surface soils in different populations of mangrove are 66.76 g/kg,177.08 mg/kg,25.49 mg/kg,and 2.34 g/kg,respectively.According to the comparative analysis,the content of TOC is the highest in the soil in the Ceriops tagal community,but it is not significantly different among all the communities;The content of MBC in the soil is significantly different among all flora communities,where the content of MBC in the soil in Ceriops tagal community and Sonneratia alba community is much higher than that in Lumnitzera racemosa community.The content of DOC in the soil in all communities is significantly different,where the content of DOC in the soil in Bruguiera sexangula community and Ceriops tagal community is much higher than that in other communities.The content of EOC in the soil in all communities is significantly different,where the content of EOC in the soil in Ceriops tagal community is much higher than that in Bruguiera sexangula community and Rhizophora Apiculata community.(2)The average ratio of active organic carbon components to total organic carbon in MBC is higher than in DOC,and that in EOC is the highest.The distribution ratios of EOC,MBC and DOC in soil are between 3.23% and 4.02%,0.22% and 0.36%,and 0.02% and 0.08%respectively.(3)

关 键 词：沉积物 土壤因子 微生物生物量碳 易氧化有机碳 可溶性有机碳 

分 类 号：S718.5[农业科学—林学]