雷州半岛尾叶桉和柠檬桉人工林土壤碳储量特征  

Characteristic of Soil Carbon Storage of Eucalyptus urophylla and Corymbiacitriodora Plantations in Leizhou Peninsula

作　　者：徐其贤 顾晓娟 何普林 张振源 王忠林 莫其锋 XU Qixian;GU Xiaojuan;HE Pulin;ZHANG Zhenyuan;WANG Zhonglin;MO Qifeng(Leizhou Forestry Bureau Co.,Ltd of China Forestry Group,Zhanjiang 524043,Guangdong,China;College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,Guangdong,China)

机构地区：[1]中林集团雷州林业局有限公司,广东湛江524043 [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1-7,共7页Eucalypt Science & Technology

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

摘　　要：为评价雷州半岛不同林龄桉树人工林土壤碳汇能力及其影响因素,以不同林龄的尾叶桉(7年生和12年生)和柠檬桉(3年生和20年生)人工林为研究对象,采集土壤样品,测定土壤有机碳(TOC)含量,并估算不同林龄桉树人工林土壤的碳储量。结果表明:12年生尾叶桉人工林各土层土壤TOC比7年生高25.27%~139.55%,20年生柠檬桉人工林各土层土壤TOC比3年生高89.23%~293.76%(除20年生10~20 cm土层外)。4种桉树林土壤碳储量大小为12年生尾叶桉(136.86 t•hm^(−2))>20年生柠檬桉(116.81 t•hm^(−2))>7年生尾叶桉(72.21 t•hm^(−2))>3年生柠檬桉(62.80 t•hm^(−2)),7年生尾叶桉和3年生柠檬桉土壤碳储量随土层的加深并无显著变化,12年生尾叶桉和20年生柠檬桉土壤60~100 cm土层碳储量显著高于其他土层。7年生尾叶桉林土壤碳储量与全氮(TN)呈显著正相关,与N∶P呈极显著正相关;12年生尾叶桉土壤碳储量与TN含量呈极显著负相关,与全磷(TP)、有效磷(AP)和N∶P呈显著负相关;20年生柠檬桉林土壤有机碳储量与TN、TP呈显著负相关,与C∶N、C∶P呈显著正相关,说明幼龄期桉树人工林土壤碳储量受到氮磷供应及其比例的影响,而随着林龄的增加,桉树人工林土壤碳储量受氮磷供应水平的影响变弱。因此,在桉树人工林的不同生长期,适当调控土壤氮磷的施加比例可以有效提高土壤碳汇能力。In order to evaluate the soil carbon(C)sequestration and its factors influencing this in eucalypt plantations of different ages in Leizhou Peninsula,this study selected Eucalyptus urophylla(7-and 12-year-old)and Corymbiacitriodora(3-and 20-year-old)plantations as research objects.These plantations were analyzed for soil total organic C(TOC)contents and soil C storage.The results showed that TOC contents in each soil layer of 12-year-old E.urophylla plantations were 25.3%~139.6%higher than those in 7-year-old plantations.TOC contents in each soil layer of 20-year-old C.citriodora plantations were 89.2%~293.8%higher than those in 3-year-old plantations(except the 10~20 cm layer of 20-year-old plantations).The rank of soil C storage of the four plantations was 12-year-old E.urophylla(136.86t•hm^(−2))>20-year-old C.citriodora(116.81t•hm^(−2))>7-year-old E.urophylla(72.21t•hm^(−2))>3-year-old C.citriodora(62.80t•hm^(−2)).The soil C storage of 7-year-old E.urophylla and 3-year-old C.citriodora plantations showed no significant changes as the depth of soil layer increased.The soil C storage of the 60~100 cm soil layer in the 12-year-old E.urophylla plantation and the 20-year-old C.citriodora plantation was significantly higher than in other plantation soil layers.Soil C storage was significantly and positively correlated with total nitrogen(N),and extremely significantly positively correlated with N∶P ratio in 7-year-old E.urophylla plantations.Also,soil C storage was significantly negatively correlated with TN,and extremely significantly,negatively correlated with total phosphorus(P),available P and N∶P ratio in the 12-year-old E.urophylla plantations.The soil C storage of 20-year-old C.citriodoraplantations was significantly and negatively correlated with TN and TP,and significantly and positively correlated with C∶N and C∶P ratios,indicating that the soil C storage of young eucalypt plantation was affected by N and P supply and its proportion,while the effect of N and P supply level on soil C

关 键 词：土壤碳储量 生态化学计量 桉树人工林 雷州半岛 

分 类 号：S714.8[农业科学—林学]