Estimation of soil organic carbon stocks in plantation forest soils of Northern Taiwan
Other Title
臺灣北部地區人工林土壤碳存量的估算
Journal
Taiwan Journal of Forest Science
Journal Volume
24
Journal Volume
24
Journal Issue
2
Journal Issue
2
Pages
103-115
Start Page
103
End Page
115
ISSN
10264469
Date Issued
2009-06
Author(s)
Abstract
The possibility of estimating the global carbon pools on the earth has attracted scientists for decades. In Taiwan, among remaining forested areas, 14% (about 420,000 ha) are plantation forests. There are few investigations of the soil organic carbon (SOC) pool of plantation forests in Taiwan. Nine plantation tree species, including 3 broadleaf species and 6 coniferous species were selected to estimate the SOC pools in selected plantation forest soils in northern Taiwan. The uncertainty of the estimates was examined, and strategies to obtain more-precise database for SOC pool management are proposed in this study. The results showed that only 2 Soil Orders, Inceptisols and Ultisols, were found at the study sites, and values of the soil bulk density (Bd) in broadleaf plantation forests were relatively higher than those in coniferous plantation forests. The stone contents were about 17 and 14% (0~30 cm) on average in the broadleaf and coniferous plantations, respectively. The average SOC was about 28 g kg^(-1) (0~30 cm) in the broadleaf plantations and about 48 g kg^(-1) (0~30 cm) in the coniferous plantations. The SOC pool was lowest in the Aleurites fordii plantation forest and highest in the Chamaecyparis obtusa plantation forest. We calculated that the average values of the SOC pool in the broadleaf plantation forest were about 6.5 (0~30 cm), 8.2 (0~50 cm), and 9.6 kg m^(-2) (0~100 cm). In coniferous plantation forests, they were about 7.4, 9.7, and 12 kg m^(-2), respectively. Estimation of the SOC pools in this study was potentially compromised by measurement errors of soil Bd, soil volume calculations, C determinations, and the stoniness of the soils. These sources of error might have introduced a bias, when comparing SOC contents among studies in the literature where different methodologies were applied. In conclusion, we suggest that the database of lower taxonomic categories (i.e., greater detail) for Soil Taxonomy and the SOC variability within and among pedons of the same soil type strongly need estimates of soil C stocks in Taiwan.
幾世紀以來，探索地球上全球性碳儲存量的可能性引起科學家的注意。臺灣地區餘留的森林地中，有14%（約420,000 ha）的面積為人工林，但這些人工林下土壤有機碳存量的資料或調查作業很少受到注意與研究。本研究在臺灣北部地區共選取9種人工林樹種，包括3種闊葉樹種與6種針葉樹種，於林下採集土壤樣本進行分析並推估該人工林下土壤之有機碳存量。另外，為了土壤有機碳庫的管理目標，本研究也一併探討推估的不確定性因素與提出獲得更準確資料庫的策略。研究結果指出：研究區的土壤樣體只分類為弱育土(Inceptisols)與極育土(Ultisols)兩種土綱；闊葉樹人工林之土壤總體密度相對較高於針葉樹人工林。在闊葉樹與針葉樹人工林中的平均土壤含石率(0~30 cm)分別約為17與14%。闊葉樹人工林下平均的土壤有機碳含量為28 g kg^(-1) (0~30 cm)，在針葉樹人工林下則為48 g kg^(-1) (0~30cm)。土壤有機碳存量以油桐人工林存量最低，臺灣扁柏人工林存量最高。經計算推估之後我們得到闊葉樹人工林土壤有機碳存量的平均值為6.5 kg m^(-2) (0~30 cm)、8.2 kg m^(-2) (0~50 cm)與9.6 kg m^(-2) (0~100cm)，針葉樹人工林土壤有機碳存量的平均值則分別為7.4、9.7與12 kg m^(-2)。由於土壤總體密度、土壤體積的計算、土壤碳存量的測定與土壤含石量等野外採樣及測量上的誤差，本研究之土壤有機碳儲存量的推估受到潛在性的限制。當比較文獻中土壤的碳含量，由於使用不同的方法，這些誤差的來源可能產生偏差性。我們建議在土壤分類系統中較低階（更詳細）的土壤分類等級與相同土壤類型之土壤剖面內部與剖面之間的土壤有機碳的變異，在未來推估臺灣地區土壤碳儲存量時是絕對必要的資料庫。
Subjects
Carbon sequestration
Forest soils
Plantation forest
Soil organic carbon stocks
碳吸存
森林土壤
人工林
土壤有機碳存量
SDGs
Publisher
農業部林業試驗所
Type
journal article