不同温度下4种速生树种凋落叶的浸泡分解特性  

Soaking and decomposition characteristics of litter leaves of four fast-growing tree species at different temperatures

作　　者：伍琪[1,2] 李德满 韦振道 彭玉华 邓紫宇[1,2] 任世奇[1,2] WU Qi;LI Deman;WEI Zhendao;PENG Yuhua;DENG Ziyu;REN Shiqi(Guangxi Forestry Research Institute,Nanning,Guangxi 530002,China;Nanning Eucalypt Plantation Ecosystem Observation and Research Station of Guangxi,Nanning,Guangxi 530002,China;Guangxi State-owned Gaofeng Forest Farm,Nanning,Guangxi 530001,China)

机构地区：[1]广西壮族自治区林业科学研究院,广西南宁530002 [2]南宁桉树森林生态系统广西野外科学观测研究站,广西南宁530002 [3]广西壮族自治区国有高峰林场,广西南宁530001

出　　处：《亚热带农业研究》2024年第1期48-54,共7页Subtropical Agriculture Research

基　　金：广西林业科技推广示范项目“桉树化学成分分析及其高值化利用研究”(桂林科研[2021]28号);广西重点研发计划项目“桉树人工林与桉木主要林产品的碳储存计量研究”(桂科AB23026010);广西科技基地和人才专项“南宁桉树森林生态系统广西野外科学观测研究站(科研能力建设)”(桂科23-026-272)。

摘　　要：[目的]了解树种和温度对速生树种凋落叶浸泡后分解特性的影响,以预测气候变化背景下速生树种的生态功能响应。[方法]以4种南方常见速生树种(松树、杉木、桉树、红锥)凋落叶为研究对象,分别在常温、20℃、35℃下浸泡22 d,并比较了4种凋落叶浸泡液的总磷、总氮、腐殖酸、单宁酸、COD含量和浊度、电导率、pH等。[结果]温度显著影响4种速生树种凋落叶浸泡液浊度的变化(P<0.05)。浸泡22 d,桉树凋落叶分解对浸泡液单宁酸含量、腐殖酸含量、pH等指标的影响大于其他树种。其中,桉树凋落叶浸泡液单宁酸含量为1407.84 mg·L^(-1),分别是松树、杉木、红锥的12、14、4倍;腐殖酸溶出量为871.40 mg·L^(-1),分别是松树、杉木、红锥的15、14、12倍;pH值保持在4.35~4.46之间,低于其他树种。[结论]松树、杉木、桉树和红锥凋落叶浸泡液浊度主要受温度影响,其余指标的变化均随树种不同而各有差异。常温比恒温条件更能促进桉树凋落叶浸泡液单宁酸的溶出,进而导致浸泡液pH值降低。[Purpose]After soaking,the effects of tree species and environmental temperature on the decomposition characteristics of litter leaves of fast-growing tree species were investigated,to predict the ecological function of fast-growing tree species in response of the context of climate change.[Method]The litter of four fast-growing southern tree species(Pine spp.,Cunninghamia lanceolata,Eucalyptus spp.and Castanopsis hystrix)were collected and soaked for 22 days at ambient temperatures,20℃,or 35℃,respectively.After soaking,content of total phosphorus,total nitrogen,humic acid,COD,tannic acid,and turbidity,conductivity,pH of the four litter leaves were investigated and compared.[Result]Temperature significantly affected the turbidity changes of soaking solution of four fast-growing tree species(P<0.05).After 22 days of soaking,the effects of decomposition of Eucalyptus litter leaves on tannic acid content,humic acid content and pH were greater than those of other 3 tree species.Tannin content of soaked Eucalyptus litter leaves reached 1407.84 mg·L^(-1),which was 12,14,and 4-fold higher than those of Pine spp.,Cunninghamia lanceolata,and Castanopsis hystrix,respectively;the amount of humic acid reached 871.40 mg·L^(-1),which was 15,14,and 12-fold higher than those of Pine spp.,Cunninghamia lanceolata,and Castanopsis hystrix,respectively;the pH remained between 4.35 and 4.46,lower than other 3 tree species.[Conclusion]The turbidity of soaking solution was mainly affected by temperature,and the changes in other indices varied with different tree species.Ambient temperature can promote the release of tannic acid from soaking solution of Eucalyptus litter leaves more than either constant temperature condition,leading to a decrease in the pH value of the soaking solution.

关 键 词：速生树种 凋落叶 温度 浸泡液 单宁酸 

分 类 号：S719[农业科学—林学]