Division of Forestry Economics, Taiwan Forestry Research Institute, Taipei, 100, Taiwan.
Division of Forest Management, Taiwan Forestry Research Institute, Taipei, 100, Taiwan.
Sci Rep. 2018 Feb 15;8(1):3070. doi: 10.1038/s41598-018-21510-x.
Forests play an important role as carbon sinks by sequestrating carbon through photosynthesis. Thinning treatments have large impacts on carbon storage, in addition to strengthening quality and quantity of plantations. This study analyzed the effects of different thinning treatments on carbon stocks in both individual trees and stands of Taiwania (Taiwania cryptomerioides) plantations. Repeated field measurements and allometric equations were used to calculate total C storage and sequestration rates of live trees. The results of this study showed that the total carbon stock of stands with thinning treatments was less than that of the non-thinned stands. The non-thinned 23-year old stands had an estimated carbon stock of 96.8 Mg C ha, which is higher than the carbon stock found in either medium- (84.1 Mg C ha) or heavily-thinned (74.7 Mg C ha) treatment plots of the same age. If the objective of Taiwania plantations was to store large amounts of carbon in the young growth stage, without regard to the initial rate of storage, a better option is no-thinning. However, the medium thinned forests seem to be more promising for carbon sequestration than the no-thinned forests if a longer period is considered.
森林通过光合作用将碳固定在土壤中，从而起到碳汇的重要作用。除了增强人工林的质量和数量外，间伐处理对碳储存也有很大影响。本研究分析了不同间伐处理对台湾杉（Taiwania cryptomerioides）人工林单株和林分的碳储量的影响。采用重复野外测量和比类推算法来计算活立木的总碳储量和固碳率。研究结果表明，间伐林分的总碳储量低于未间伐林分。未经间伐的 23 年生林分的碳储量估计为 96.8 Mg C ha，高于同龄的中度（84.1 Mg C ha）和重度（74.7 Mg C ha）间伐林分的碳储量。如果台湾杉人工林的目标是在幼龄阶段储存大量的碳，而不考虑初始储存速率，那么不间伐是更好的选择。然而，如果考虑更长的时间，中度间伐的森林似乎比未间伐的森林更有潜力进行碳封存。
