尾叶桉人工林和固氮树种马占相思人工林碳储量差异特征  

Variation and Characteristic of Carbon Storage of Eucalyptusurophylla and N-fixing Acacia mangium Plantations

作　　者：黎燕莲 陈远富 梁顿 谢红杰 刘悦 吴妙兰 顾晓娟 莫其锋 LI Yanlian;CHEN Yuanfu;LIANG Dun;XIE Hongjie;LIU Yue;WU Miaolan;GU Xiaojuan;MO Qifeng(YangjiangState-ownedHuatan Forest Farm,Yangchun 529600,Guangdong,China;College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,Guangdong,China)

机构地区：[1]阳江市国有花滩林场,广东阳春529600 [2]华南农业大学林学与风景园林学院,广东广州510642

出　　处：《桉树科技》2024年第1期8-13,共6页Eucalypt Science & Technology

基　　金：广东省林业科技创新项目(2022KJCX017、2022KJCX015)。

摘　　要：以广东省阳江市国有花滩林场的尾叶桉(Eucalyptus urophylla)和固氮树种马占相思(Acacia mangium)人工林为研究对象,探究2种人工林的乔木层和土壤层的碳储量差异,为提升粤西地区人工林碳汇能力提供数据参考。结果表明:(1)尾叶桉和马占相思不同器官碳含量大小为树干>树根>树枝>树叶,且尾叶桉树干的碳含量及其占植株总碳含量的比例均显著高于马占相思(P<0.05),而马占相思的树根、树枝和树叶的碳含量均显著高于尾叶桉(P<0.05);(2)2种林分土壤的碳含量和碳储量均随着土层的加深而显著降低,0~40 cm土层碳储量占1 m深土层碳储量的比例分别达56.59%、53.35%,表明2种人工林土壤碳主要分布在上层;(3)尾叶桉人工林乔木层的碳储量及其占人工林碳储量的比例均显著高于马占相思(P<0.05);相反,马占相思人工林土壤碳储量比尾叶桉高13.92%,且马占相思林的土壤碳储量占人工林碳储量的比例显著高于尾叶桉(P<0.05),说明马占相思人工林将较高比例的碳分配在土壤中。本研究结果表明,利用固氮树种进行人工造林对提升土壤碳汇能力具有较大的潜力。In this paper,the difference of carbon(C)storage in the tree and soil layers of Eucalyptus urophylla and Acacia mangium plantations in Yangjiang State-owned Huatan Forest Farm,Guangdong Province,were explored to provide scientific reference data for improvement of C sink capacity of the plantations in Western Guangdong Province.The results showed that:(1)the C contents of different organs of E.urophylla and A.mangium ranged in the order:trunks>roots>branches>leaves,and the C contents of E.urophylla stems and their proportion of the total tree biomass C content were significantly higher than those of A.mangium(P<0.05),while the C contents of roots,branches,and leaves of A.mangium were significantly higher than those of E.urophylla(P<0.05).(2)Soil C contents and storage of the two plantations decreased significantly with increasing soil depth,with C storage of the 0~40 cm soil layer accounting for 56.59%and 53.35%,respectively,indicating that the soil C contents in both plantations were mainly distributed in the upper soil layers.(3)The C storage and its proportion in the stem layer of E.urophylla plantations were significantly higher than those in A.mangium plantations(P<0.05).Conversely though,the soil C storage in the A.mangium plantations was 13.92%higher than that in the E.urophyllaplantations,and the ratio of soil C storage to ecosystem C storage in A.mangium plantations was significantly higher than that in E.urophylla plantations(P<0.05),indicating that a higher proportion of C was located in the soil in A.mangium plantations.The results of this study indicate that afforestation of nitrogen-fixing tree species has great potential to improve soil C sink capacity.

关 键 词：碳储量 尾叶桉 马占相思 固氮树种 粤西地区 

分 类 号：S714.8[农业科学—林学]