Organic carbon storage and management strategies of the forest soils based on the forest soil survey database in Taiwan

in International Symposium (oral presentation paper), 國際研討會(全文口頭發表)
標題Organic carbon storage and management strategies of the forest soils based on the forest soil survey database in Taiwan
出版類型國際研討會(全文口頭發表)
出版年度2010
AuthorsTzou-Chi Huang, 蔡呈奇, Z.S. Chen 陳尊賢, Hseu 許正一, 杜清澤, & Kuo 郭鴻裕
出版日期Sep 28 2010 12:0
會議地點茂物 (Bogor)
其他編號0000
中文摘要

Soil organic C (SOC) is a critical component of a terrestrial ecosystem. In Taiwan, forests cover almost 2/3 of the total area of the island, but the detail forest soil survey was conducted for 10 years by Taiwan Forestry Research Institute (TFRI) from 1993 to 2002. The estimates of the stored C in forest soils of Taiwan are scarce before the 1990s. Based on the forest soil survey database and former studies, the aims of this study were (1) to calculate the current forest SOC stocks in the major Soil Orders; (2) to estimate total forest SOC pools in different depths; (3) to examine the regional SOC stocks in andic soil landscape and SOC stocks along an elevation gradient in plantation forest; and (4) to propose the strategies of SOC sequestration in the forest soils. The major Soil Order distributed in the Taiwanese forest soils are Inceptisols (44.2%), Entisols (35.3%), Alfisols (10.8%), and Ultisols (7.50%). The mean SOC in Taiwanese forest soils, excluding Histosols and Spodosols, is 10.1 kg m-2 (0-30 cm), 13.8 kg m-2 (0-50 cm), and 18.5 kg m-2 (0-100 cm). Cumulatively, 59% and 78% (on average) of the total SOC to a depth of 100 cm in the forest soils is stored in the upper 30 cm and 50 cm, respectively. The total SOC pools to the depth of 30 cm, 50 cm, and 100 cm calculated from soil surface in Taiwanese forest soils are about 114, 126, and 160 Tg, respectively. Besides, the examination of the regional SOC stocks in andic soil landscape in Yangmingshan National Park suggested that Andisols and Inceptisols are major soils in this area, and the man SOC storage of volcanic ash soils in Taiwan is 15.7 kg m-2 (0-100 cm). Based on the soil map derived from a small scale soil survey (1600 ha in Tatunshan and 400 ha in Chishingshan), the SOC pool in Tatungshan was 55.2 and 269 Gg/0-100 cm for Andisols and Inceptisols, respectively. In Chishingshan, it was 48.5 and 32.5 Gg/0-100 cm for Andisols and Inceptisols, respectively. In addition, the results of SOC stocks along an elevation gradient (200 m~2000 m a.s.l.) in plantation forest in northern Taiwan showed that the SOC stocks increased with elevation increased (p < 0.01), and temperature has significantly influences on SOC stocks than precipitation. The values of calculated average SOC stocks to the depth of 100 cm were 9.6 kg m-2 and 12 kg m-2 for the broadleaf and coniferous plantation forests, respectively. Steeply slope, stony and clayey soil texture within soils are both obviously characteristics of forest soil in Taiwan. Recently studies suggested afforestation immediately after forest fire could sequestrate much more C, especially in the litter fall layer. Furthermore, in order to increase the amount of C sequestration, old growth plantation forests have to thinning, but it is conditionally for preventing frequently typhoon and moon soon disturbance.

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