Effects of Stand Ages and Site Conditions on Carbon Stock of Pinus tabuliformis Plantations in Beijing Mountainous Area
This study regarded the chronosequence of Pinus tabuliformis plantations, which located at the Hongmengchuan catchment in the northeast of Miyun county, as the research object to analyze the organic carbon stock for Pinus tabuliformis plantation ecosystem with different stand ages and the factors that influence carbon sequestration in the typical forest type in the Beijing mountainous area, by using trees relative growth model, as well as the whole harvest method.The results showed that: (1) The vegetable carbon stock increased with the increasing stand age.Compared with 35-year-old Pinus tabuliformis forest,vegetable carbon stock of 57-year-old forest increased by 90.28％, and vegetable carbon stocks of Pinus tabuliformis forests with different stand ages were significantly higher than that of shrub (4.48±0.23 t/hm2).(2) Compared with shrub, soil organic carbon stocks of 35-year-old and 40-year-old Pinus tabuliformis forest did not increase, and even showed a slight decline, and soil organic carbon stock of 57-year-old Pinus tabuliformis forest increased by 61.66％.Therefore, carbon sequestration of plantation has been a long process.(3) The carbon stock of Pinus tabuliformis forest ecosystem increased with the increasing stand age, which were (73.84-t-5.61) and (84.52 ± 14.79) t/hm2 in 35-year-old and 40-year-old stands, respectively, and increased by 19.72％ and 30.94％, respectively, compared to that of the natural shrub (64.67-t-12.23 t/hm2).The carbon stock in the 57-year-old Pinus tabuliformis forest ecosystem reached up to (141.5±3.42) t/hm2, which increased by 118.80％ compared to that of the natural shrub.The average carbon storage in different components of forest ecosystem followed the order of soil layer (57.70％)＞vegetation layer (32.36 ％)＞litter layer (9.94％).(4) The carbon stock of Pinus tabuliformis forest ecosystem was mainly affected by stand age and soil texture, which jointly explained 65.6％ of organic carbon storage variability.Among them, soil carbon stock was also affected by stand age and soil texture, which jointly explained 75.9 ％ of soil organic carbon stock variability, and vegetation carbon stock was closely related with stand age.The study systematically studied carbon sequestration status and its relationship with influence factors, and provided the basis for the evaluation of plantation carbon sequestration benefits and forestry health management in Beijing mountainous area.
mountainous areaplantationPinus tabuliformisorganic carbonstand age
国家科技期刊平台
NSTL
万方数据
维普
