油杉人工林凋落物及其碳氮归还动态  

Dynamic of Litter and Carbon and Nitrogen Return of Keteleeria fortunei Plantation

作　　者：陈金章 CHEN Jinzhang(Forestry Bureau of Quanzhou City, Quanzhou 362000, Fujian, Chin)

机构地区：[1]泉州市林业局,福建泉州362000

出　　处：《福建林业科技》2017年第4期14-17,27,共5页Journal of Fujian Forestry Science and Technology

基　　金：福建省省属公益类科研院所基本科研专项(2015R1011-11);国家林业公益性行业科研专项(201304108)

摘　　要：在福建省永春县桃城镇大坪村湖内,采用样地法对50年生油杉人工林凋落物进行为期1 a的定位监测,研究油杉人工林凋落物及其碳氮归还规律。结果表明:油杉人工林年凋落量为5629.60 kg·hm^(-2)·a^(-1),叶是凋落物的主要形式。凋落物量有着明显的季节变化,呈现双峰形态,即2014年10月和2015年5月出现2次高峰;凋落物碳元素含量月动态比较稳定,碳元素平均含量介于469.306~498.817 g·kg-1之间;而氮元素含量受油杉生理活动的影响,月动态变化较大,氮元素平均含量最大值是最小值的1.51倍;碳、氮元素含量大小排序均为叶>枝>杂。碳、氮元素年归还量分别为2578.325、68.434 kg·hm^(-2);落叶碳、氮元素年归还量分别占总量的54.40%、55.01%;落枝碳、氮元素年归还量分别占总量的36.26%、35.87%;其它杂物凋落物碳、氮元素年归还量分别占总量的9.34%、9.12%。In Hunei,Daping village,Taochen town,Yongchun county,Fujian Province,locating monitoring on litter of 50-year-old Keteleeria fortunei plantation was carried for 1 year by sample plot method to study on the law of litter and its carbon and nitrogen return of Keteleeria fortunei plantation.The results of the study showed the annual litter of Keteleeria fortunei plantation was 5629.60 kg·hm^-2·a^-1,and the leaves were the main form of litter.The quantity of the litter dynamically changed along the seasons,expressing double peaks individually in October of 2014 and May of 2015.The monthly carbon content of litter was relatively stable,and the change was small,and the average content of carbon was between 469.306 and 498.817 g·kg^-1.The nitrogen content was affected by the physiological activities of Keteleeria fortunei,so the monthly nitrogen content of litter changed greatly.The average nitrogen content maximum was 1.51 times the minimum value.The content of carbon and nitrogen was in order of leaves branches miscellaneous.The annual return of carbon and nitrogen elements was 2578.325 kg·hm^-2、68.434 kg·hm^-2.The annual return of carbon and nitrogen in deciduous leaves accounted for 54.40% and 55.01%,respectively.The annual return of carbon and nitrogen in fallen branches accounted for 36.26% and 35.87%,respectively.The annual return of carbon and nitrogen in other litters accounted for 9.34% and 9.12%,respectively.

关 键 词：油杉 凋落物 碳元素 氮元素 养分归还 

分 类 号：S791.15[农业科学—林木遗传育种] S718.554.2[农业科学—林学]