会同杉木人工林不同生长阶段植物固碳特征

为了探讨杉木人工林不同生长阶段的固碳功能,以会同杉木林为研究对象,在定位连续测定林分生物量和碳素含量的基础上,研究了杉木林不同年龄阶段的储存碳量及在各组分的分配和植物固碳能力。结果表明:杉木各器官碳素含量树叶树皮树根树干树枝,且随着林龄增加而增大;杉木林植被储存碳量为22.93—86.98 t/hm2,各个层次储存碳量乔木层林下植被层枯死物层;乔木层碳素在器官间的相对分配大小依次为树干树根树叶树皮树枝;树干碳素分配比随着年龄增长而增大,树枝、树叶随年龄增长而减少,树根和树皮虽有波动,但变化较平稳;树枝、树叶、树干、树皮和树根碳积累年均变化都呈单峰形曲线,但波峰出现林龄各有不同;杉木林固碳动态特征可分为固碳功能建立、固碳能力迅速增长、固碳能力最大、固碳能力相对平稳和固碳能力下降等5个阶段;杉木林的固碳能力,不仅受不同生长阶段生长发育生物学特性的制约,而且还受林分冠层结构特征以及土壤肥力条件的影响。

Carbon fixed characteristics of plant of Chinese fir(Cunninghamia lanceolata) plantation at different growth stages in Huitong

Based on located observations biomass and carbon content carbon of plants from a national key field scientific experimental station in Huitong, carbon storage, carbon allocation characteristics of each component in Chinese fir (Cunninghamia lanceolata) plantations, the ability to stand fixed carbon dynamics in Cinese fir plantation at different ages were studied. The results showed that the carbon content of the Stand components increased with the age, which in the ranked as follow: needle > bark > root > trunk > twig at the same age. Forest carbon storage ranged from 22.93 to 86.98 t/hm²,the carbon storage is greater in tree layer than the understory vegetation layer, and the understory vegetation layer is greater than the layer of dead matter. Tree layer of carbon on the relative distribution of organs ranked as trunk > root > leaf > bark > branch. Trunk carbon allocation to increase with age, branches, leaves decrease with age, although the roots and bark fluctuated, the change is relatively stable. The needle, twig,trunk, bark, roots carbon accumulation, the average annual change showed a single peak-shaped curve, but the crest of a different time. The fixed carbon dynamic characteristics can be divided into five stages of the fir forest, i.e. the establishment of the function of the fixed carbon, carbon fixation ability to rapidly increase, the ability to achieve maximum fixed carbon, the ability of the fixed carbon is relatively stable, decreased ability of the fixed carbon. The Carbon sequestration in Chinese fir plantations is affected not only by the constraints of the biological characteristics of the different growth stages of growth and development rhythm, but also by the stand canopy structure and soil fertility conditions.