雷州半岛不同林龄尾巨桉人工林凋落物产量、养分归还及分解动态研究  

Litter Production, Nutrient Return and Decomposition in Eucalyptus Plantations of Different Ages in Leizhou Peninsula

作　　者：雍强 陈彪 林波 邓殷 苏寒 雷福年 覃重喜 陆玉锋 许宇星 YONG Qiang;CHEN Biao;LIN Bo;DENG Yin;SU Han;LEI Funian;QIN Chongxi;LU Yufeng;XU Yuxing(Guangxi State-owned Qipo Forest Farm,Nanning 530225,Guangxi,China;China Eucalypt Research Centre,Zhanjiang 524022,Guangdong,China)

机构地区：[1]广西壮族自治区国有七坡林场,广西南宁530225 [2]国家林业和草原局桉树研究开发中心,广东湛江524022

出　　处：《桉树科技》2019年第3期16-21,共6页Eucalypt Science & Technology

基　　金：广西科技重大专项(桂科AA17204087-9);国家重点研发计划课题(2016YFD0600505,2016YFD0600504);广东湛江桉树林生态系统国家定位观测研究站运行项目(2019132141)

摘　　要：为了解雷州半岛地区桉树人工林凋落物产量,养分归还及分解动态变化特征,本研究对不同林龄尾巨桉人工林进行为期12个月的跟踪监测。结果表明:枝叶年总凋落物量表现为5 a>9 a>7 a>1 a,不同人工林叶片凋落物量随季节变化呈现双峰型曲线,但枝条凋落物量随季节变化无明显规律可循。4个林龄叶片、枝条的氮、磷、钾总归还量表现为9 a>5 a>7 a>1 a。叶片失重率变化趋势在各林龄间差异不大,出现较明显的两个分解阶段,但枝条失重率并未出现明显阶段差异。同时,枝条的分解系数表现为1 a>7 a>9 a>5 a,叶片的分解系数则表现为7 a>9 a>1 a>5 a,说明在5 a林分内,凋落物叶片及枝条的分解速率均小于其他各林分,在该林分中分解半衰期和周转期均长于其他林分。In order to understand the yield,nutrient return and decomposition dynamics of litter in Eucalyptus urophylla×E.grandis plantations in Leizhou Peninsula,this study carried out monitoring of litter over a 12-month period in Eucalyptus plantations of different ages.The results showed that the total amount of branch and leaf litter combined from the different age plantations was ranked by order of magnitude as:5 a>9 a>7 a>1 a.The amount of leaf litter in plantations of different ages showed a bimodal curve with seasonal changes,but there was no obvious rule for the amount of branch litter.The total return of nitrogen,phosphorus and potassium in leaf and branch litter of 4 plantation ages,ranked by order of magnitude,was 9 a>5 a>7 a>1 a.There were two obvious stages in leaf decomposition(judged by weight),but no obvious stage differences in decomposition of branches.At the same time,the decomposition coefficients of branches and leaves in the different age plantations,ranked by order of magnitude,were 1 a>7 a>9 a>5 a and 7 a>9 a>1 a>5 a respectively,indicating that the rate of litter decomposition in 5 a plantations was lower than that in all other plantations.Thus,the decomposition half-life and turnover period of litter were longest in the 5 a plantation.

关 键 词：尾巨桉 凋落物 养分归还 分解 

分 类 号：S718.554[农业科学—林学]