更新造林對土壤碳吸存的效應：以臺灣二葉松林火燒後為例
Other Title
Effect of Reforestation Practice on Soil Carbon Sequestration: A Case Study in Taiwan Red Pine Forest after Wildfire
Journal
中華林學季刊
Journal Volume
45卷
Journal Volume
45
Journal Issue
4期
Journal Issue
4
Pages
435-450
Start Page
435
End Page
450
Date Issued
2012-12
Author(s)
Abstract
本研究以臺灣東北部大甲溪事業區之臺灣二葉松火災跡地更新造林地為研究區域，分別建立91樣區［對照組，未造林地］、92樣區［92年造林地］與97樣區［97年造林地］三種處理區，在91與97兩個樣區設置3個20 m × 25 m的樣區，在92樣區設置6個10 m × 10 m的樣區，採集地表枯落物與不同深度的土壤樣本，分析其中的碳含量與推估樣區碳吸存量，主要的研究目的為評估與探討火災跡地更新造林之後，不同造林時間土壤碳吸存量的變化以及更新造林對土壤碳吸存之效應。研究結果指出：研究區內的土壤多為新成土與弱育土；本區地形坡度極陡，容易受到地形不穩定的攪動。森林火災後儘速進行更新造林，可以明顯的提高地表枯落物的碳吸存（累積）量，但是並沒有顯著增加土壤的碳貯存量，而更新造林時間愈晚，土壤的碳貯存量將會減少的愈多。92年造林地枯落物的碳累積或吸存速率為10.8 tons ha^(-1) yr^(-1)，97年造林地則沒有碳累積效應。92年造林地土壤（0－100 cm）的碳減少速率為3.54 tons ha^(-1) yr^(-1)，97年造林地的碳減少速率為5.16 tons ha^(-1) yr^(-1)。本研究區火燒跡地造林的成效，92年造林地地表枯落物與土壤兩者之碳累積速率為7.26 tons ha^(-1) yr^(-1)，97年造林地之碳減少速率為5.16 tons ha^(-1) yr^(-1)。研究結果顯示：森林火災後應儘速的造林，此對於臺灣森林土壤碳吸存會有相當的助益。
The reforestation in Taiwan red pine (Pinus taiwanensis Hayata) fire-slash in Dajia Creek Business District , northeastern Taiwan , was selected for study area in this stud y project, including three treatments: 91 plot (control, fire-slash without reforestation), 92 plot (reforestation, I year after forest fire), and 97 plot (reforestation, 6 years after forest fire). Three sampling plots (20 × 25 m, 0.05 ha) were set in 91 plot and 97 plot, and 6 sampling plots (10 × 10 m, 0.01 ha) were set in 92 plot. Litter in the soil surface and soils in different depth were collected for analyzing the carbon content and estimating the carbon stock in the plots. The main objective of this study was to evaluate and investigate the changes and effects of soil carbon sequestration in different reforestation times after forest fire. The results of this study showed that Entisols and Inceptisols were the major soil type, and the steeply slope usually caused landscape disturbance in this study area. The results also indicated that reforestation immediately after forest fire could significantly increase the litter carbon sequestration (accumulation), but soil carbon sequestration was not obviously increased. Besides, soil carbon sequestration would be decreased quickly if the reforestation after forest fire was late. The estimated litter carbon sequestration rate was 10.8 tons ha^(-1) yr^(-1) in 92 plot, but no sequestration in 97 plot. The estimated soil carbon sequestration rate (0-100 cm) was 3.54 tons ha^(-1) yr^(-1) decreased in 92 plot, and it was 5.16 tons ha^(-1) yr^(-1) decreased in 97 plot. The summation of litter and soil carbon sequestration rate indicated that it was 7.26 tons ha^(-1) yr^(-1) increased in 92 plot but 5.16 tons ha^(-1) yr^(-1) decreased in 97 plot. In conclusion, reforestation should be immediately preceded after forest fire, and would greatly helpful in forest soil carbon sequestration in Taiwan.
Subjects
更新造林
森林土壤
土壤碳吸存
Reforestation
Forest soil
Soil carbon sequestration
Publisher
中華林學會
Type
journal article