不同林龄和潮位无瓣海桑生态系统碳储量差异  

Comparison of Carbon Stock of Sonneratia apetala Ecosystem under Different Forest Ages and Tidal Levels

作　　者：胡娜胥 冯建祥 赵志刚 李小媚 魏龙[5] HU Naxu;FENG Jianxiang;ZHAO Zhigang;LI Xiaomei;WEI Long(School of Eco-Environment Technology,Guangdong Industry Polytechnic,Guangzhou,Guangdong 510300,China;School of Marine Sciences,Sun Yat-sen University,Zhuhai,Guangdong 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai,Guangdong 519000,China;Guangzhou Institute of Forestry and Landscape Architecture/Guangzhou Collaborative Innovation Center on Science-tech of Ecology and Landscape,Guangzhou,Guangdong 510405,China;Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization/Guangdong Coastal Shelter-belt Ecosystem National Observation and Research Station/Guangdong Academy of Forestry,Guangzhou,Guangdong 510520,China)

机构地区：[1]广东轻工职业技术大学生态环境技术学院,广东广州510300 [2]中山大学海洋科学学院,广东珠海519082 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519000 [4]广州市林业和园林科学研究院/广州市生态园林科技协同创新中心,广东广州510405 [5]广东省森林培育与保护利用重点实验室/广东沿海防护林生态系统国家定位观测研究站/广东省林业科学研究院,广东广州510520

出　　处：《林业与环境科学》2024年第5期1-9,共9页Forestry and Environmental Science

基　　金：广东省林学会科技计划项目(2021-GDFS-KJ-07);广东省林业科技创新项目(2024KJCX001);省级温室气体清单编制项目(STQH-2021-050)。

摘　　要：为探究林龄和潮位对无瓣海桑Sonneratia apetala生态系统碳储量的影响,文章以广东省珠海市淇澳岛自然保护区的无瓣海桑人工林为研究对象,选择滩涂、高潮位无瓣海桑林(2002年种植,18 a)、低潮位无瓣海桑林(2002年种植,18 a)、低潮位无瓣海桑林(2008年种植,12 a),分别测定生物量和0~100 cm土层土壤的有机碳含量、氮磷硫含量、微生物碳含量,以及理化因子如pH、盐度、容重。结果表明,18 a低潮位无瓣海桑植物生物量((297.06±18.92)Mg·hm^(-2))、土壤碳储量((184.97±2.45)Mg·hm^(-2))和生态系统碳储量((312.77±10.59)Mg·hm^(-2))均显著高于12 a低潮位无瓣海桑(分别为(210.68±4.80)、(137.86±10.31)和(228.49±12.37)Mg·hm^(-2),P<0.05),林龄的增加显著提高了植物生物量以及土壤碳氮比,表明红树林源碳对土壤碳的贡献比例明显增大。18 a高潮位无瓣海桑的生态系统碳储量(347.66±39.46 Mg·hm^(-2))显著高于18 a低潮位无瓣海桑(P<0.05),可能是因为高潮位无瓣海桑林经受低强度的潮汐作用以及较弱的微生物分解作用。因此,林龄和潮位对生态系统碳储量均有显著性影响,而无瓣海桑因其较低的碳氮比,可能会不利于土壤碳的累积,同时因无瓣海桑具有潜在的入侵风险,不适宜作为本土红树林退化区生态修复的工具种。To investigate the effects of forest age and tidal level on the carbon stock of Sonneratia apetala ecosystem,the artificial forest of S.apetala in Qi′ao Island Nature Reserve of Zhuhai city,Guangdong province was selected as the research object.The four sites were mudflat,high tidal level S.apetala forest(planted in 2002,18-year-old),low tidal level S.apetala forest(planted in 2002,18-year-old),and low tidal level S.apetala forest(planted in 2008,12-year-old).The biomass,soil organic carbon content,nitrogen,phosphorus and sulfur contents,microbial carbon,and physical and chemical factors such as pH,salinity,and bulk density of 0-100 cm were measured.The results showed that the plant biomass((297.06±18.92)Mg·hm^(-2)),soil carbon stock((184.97±2.45)Mg·hm^(-2)),and ecosystem carbon stock((312.77±10.59)Mg·hm^(-2))of low tidal level S.apetala at 18-year-old were significantly higher than those of high tidal level S.apetala at 12-year-old((210.68±4.80),(137.86±10.31),and(228.49±12.37)Mg·hm^(-2)),respectively,P<0.05).The increase in forest age can significantly increase plant biomass and the contribution ratio of mangrove source carbon to soil carbon.The ecosystem carbon stock((347.66±39.46)Mg·hm^(-2))of S.apetala at the 18-year-old high tide level was significantly higher than that of S.apetala at the 18-year-old low tidal level(P<0.05),which might be attributed to the low tidal erosion and microbial decomposition of S.apetala forest at the high tidal level.Therefore,both forest age and tidal level have significant effects on ecosystem carbon stock,while the S.apetela may not be conducive to the accumulation of soil carbon due to its low C∶N ratio.Meanwhile,due to its potential invasive risk,the S.apetela is not suitable as a tool species for ecological restoration for degraded mangrove forests.

关 键 词：无瓣海桑 红树林 碳储量 潮位 林龄 

分 类 号：S718.5[农业科学—林学]