【摘要】 对广西中部丘陵区不同年龄阶段(8年生、14年生、23年生、38年生)的马尾松人工林生物量和净生产量进行了研究,探讨了该人工林生产与碳素动态.结果表明:马尾松林的生物量和碳贮量随着年龄的增长而增加,马尾松幼龄林(8年生)、中龄林(14年生)、近熟林(23年生)、成熟林(38年生)生物量分别为32.0、108.0、186.6、197.4t·hm-2,相应地其碳贮量分别为15.896、53.788、94.357、98.708t·hm-2;不同年龄阶段马尾松林的凋落物现存量和碳贮量大小顺序为近熟林>中龄林>幼龄林>成熟林;土壤—植物系统的碳贮量空间分布序列为土壤层>乔木层>凋落物层;马尾松幼龄、中龄林、近熟林、成熟林等不同年龄阶段年净生产力分别为8.59、17.63、19.55和9.57t·hm-2a-1,年碳固定量分别为4.404、9.072、9.997和4.912t·hm-2a-1;适度间伐后,林分的生物量和碳贮量明显增加.更多还原

【Abstract】 Carbon dynamics of Masson pine plantation in different age classes (8 a, 14 a, 23 a, 38 a) in the central hilly area of Guangxi, China was studied based on the estimation of their biomass and net primary production (NPP). The results show that the biomass and carbon storage of Masson pine plantation in different age classes increase with the growth of its stands; that the biomass of each age class is respectively 32.0, 108.0, 186.6 and 197.4 t·hm-2 and correspondingly, the carbon storage of each is respectively 15.896, 53.788, 94.357 and 98.708 t·hm-2; that the quantity of the litter floor and its carbon storage rank as follows: 23 a>14 a>8 a>38 a and the carbon storage spatial distribution in soilvegetation system is in the order of soil > bark > litter; that the annual net primary production of different age classes is respectively 8.59, 17.63, 19.55 and 9.57 t·hm-2a-1 while their annual carbon amount is respectively 4.404, 9.072, 9.997 and 4.912 t·hm-2a-1; and that after appropriate thinning, the biomass and carbon storage of Masson pine plantation increase evidently. These results could provide some basic data for the carbon budget estimation of a forest ecosystem and dynamic simulation, and offer governments scientific evidence for making up forest development plans and policies to protect the environment.更多还原