Carbon Storage and Its Allocation Characters of Chinese Fir Seedling Forest and Sprout Forest in Different Stand Ages
Combining the field plot survey and laboratory chemical analysis method,Chinese fir seedhng forest and sprout forest in southwest of Jiangxi were studied to reveal the carbon storage allocation characters of different stand ages and regeneration pattern,and to provide a scientific basis for the sustainable management of plantations.Our results showed that the carbon storage in tree layer of seedling plantation within different stand ages was generally higher than that of sprout forest.The carbon storage in tree layer of Chinese fir seedling forest within young,mid-mature,nearly mature,mature forest were 9.63 t/hm2,42.14 t/hm2,69.15 t/hm2 and 105.21 t/hm2,respectively,and the average annual amount of carbon sequestration were 1.69 t/hm2,2.63 t/hm2,3.01 t/hm2and 3.39 t/hm2,and the trunk carbon storage of those accounted for 50.36％,70.60％,73.86％ and 77.58％ of the whole tree layer.The carbon storage in tree layer of Chinese fir sprout forest within young,mid-maturation,nearly mature,mature forest were 8.42 t/hm2,23.58 t/hm2,48.54 t/ hm2,and 75.26 t/hm2,respectively,the annual average amount of carbon storage of those were 1.21 t/hm2,1.57 t/hm2,2.11 t/hm2 and 2.59 t/hm2,and the trunk carbon storage of those accounted for 54.28％,66.12％,71.92％ and 73.70％ of the whole tree layer.The lowest soil carbon sequestration of both Chinese fir seedling forest and sprout forest were found in young forest,and the highest of those were found in mature forest.The ranking order of soil carbon storage of Chinese fir seedling forest were mature forest (153.21 t/hm2)＞nearly mature forest (138.17 t/hm2)＞young forest (128.30 t/hm2) ＞ mid-maturation forest (113.11 t/hm2),while that of sprout forest were mature forest (154.03 t/hm2) ＞nearly mature forest (138.28 t/hm2)＞young forest (130.20 t/hm2) ＞mid-maturation forest (117.05 t/hm2).Under the condition of the same stand density,the total carbon storage of sprout forest was lower than that of seedling forest except for young forest.There were significant difference of carbon storage within different stand ages between Chinese fir seedling forest and sprout forest (p＜0.05),however,the total carbon storage was not significantly different between the young and mid-mature forest,while significant difference was found between nearly and mature forest.Different growth rules and management caused different carbon storage allocation characters between Chinese fir seedling forest and sprout forest.In general,Chinese fir sprout forest were rich in understory species,and the ability for carbon sequestration of shrub,herb and litter layer were stronger,which were better than Chinese fir seedling forest in the aspect of soil and water conservation function.
carbon storageallocation charactersChinese fir seedling forestChinese fir sprout foreststand age
国家科技期刊平台
NSTL
万方数据
维普
