北京油松人工林凋落物及粗死木质残体贮量研究  

Storage of litter and coarse woody debris of Pinus tabulaeformis plantation in Beijing

作　　者：陶立超[1] 孟晓清[1] 孙翀[1] 刘琪璟[1] 

机构地区：[1]北京林业大学林学院,北京海淀100083

出　　处：《福建林学院学报》2014年第1期26-32,共7页Journal of Fujian College of Forestry

基　　金：国家林业公益性行业科研专项基金资助项目(201104006)

摘　　要：通过对北京14块油松人工林样地进行调查,估测了北京地区的油松人工林地表凋落物和粗死木质残体(CWD)的贮量。结果表明,北京地区油松人工林凋落物贮量为25.614 t·hm-2,变异系数为0.112-0.635;CWD贮量为0.213 t·hm-2,变异系数为0.854-2.449。凋落物贮量主要集中在半—已分解层,其一般占凋落物贮量的60%-80%,其次为未分解层叶,所占比例一般低于30%,而未分解层枝所占比例最小,低于15%。不同密度等级的油松林凋落物中养分元素含量均表现出N(53.55 kg·hm-2)>K(31.97 kg·hm-2)>P(7.29 kg·hm-2)的规律,但各元素含量在不同密度林分中大小规律不完全相同,N元素含量依次为Ⅰ(2 500株·hm-2)>Ⅱ(2 000株·hm-2)>Ⅲ(1 700株·hm-2),P和K元素含量依次为Ⅰ>Ⅲ>Ⅱ。经相关性分析得出,凋落物贮量与林分平均树高呈显著正相关,而CWD贮量与平均胸径、海拔、坡度均呈显著负相关,与林分密度呈显著正相关。By surveying the 14 plots of Pinus tabulaeformis plantation in Beijing, biomass of floor litter and coarse woody debris of P. tabulaeformis plantation was estimated. Forest litter biomass storage in P. tabulaeformis plantation was 25. 614 t hm 2 with a coefficient of variation changing from 0. ll2 to 0. 635, and coarse woody debris biomass accounted for only 0. 213 t hm-2 with a coefficient of variation vatting from 0. 854 to 2.449. Litter biomass in all plots was mainly allocated in proportionally/completely- decomposed layer, which accounted for from 60% to 80% , followed by the foliage in undecomposed layer with a percent of smaller than 30% and branches in undeeomposed layer lower than 15%. Nutrient elements of litter in P. tabulaeformis plantation with different density were N （53.55 kg-hm 2） , K（31.97 kg＇hm-2） and P（ 7.29 kg.hm-2） in the size-down order of the contents of them. However, each nutrient element content showed different law in the forests with different density classes, N content of stand density followed the order of I （2 500 trees, hm-2 ）, lI （2 000 trees, hm 2 ） and m （1700 trees, hm-2 ）, while both K and P content followed by the order I 〉III 〉 II. Floor litter biomass was significantly positively correlated with only average height, while coarse woody debris biomass had negative cm＇relation with average diameter, elevation and positive correlation with stand density.

关 键 词：油松人工林 凋落物 粗死木质残体 生物量 

分 类 号：S718.55[农业科学—林学]