Organic carbon storage and management strategies of the rural soils on the basis of soil information system 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 rural soils on the basis of soil information system in Taiwan
AuthorsHseu, 許正一, Jien 簡士濠, Kuo 郭鴻裕, Tzou-Chi Huang 蔡呈奇, & Z.S. Chen 陳尊賢
出版日期Sep 29 2010 12:0
會議地點茂物 (Bogor)

With the increasing concern over global climate change, it has become vital to quantify global and local soil organic carbon (SOC) storage. A total of 620 soil series have been established for the rural soils in Taiwan, which may provide a clear scenario of a national scale SOC stock from the soil information system (SIS). This study for Taiwanese rural soils aimed to (1) calculate the current SOC stocks in the major Soil Orders, (2) estimate total SOC pools in different depths of Taiwanese rural soils, (3) compare SOC storage with different land uses particularly on the change from paddy to upland cropping, and (4) propose the sustainable soil management for sequestrating SOC associated with improved SIS. The Taiwanese rural soils are dominated by Entisols, Inceptisols, Alfisols, and Ultisols, which total area is around 16830 km2. The avarage SOC stocks with 0-30 cm, 0-50 cm, and 0-100 cm depths were about 5.97, 8.06, and 11.0 kg/m2, respectively. However, the major SOC stocks were concentrated in 0-30 cm, which was more than 50% of the total stocks in 100 cm depth. Regarding the SOC pools, Taiwanese rural soils contained 130, 174, and 222 Tg in 0-30 cm, 0-50 cm, and 0-100 cm depths. Fluvial and marine terraces are ones of important agricultural lands in Taiwan. The soil age on fluvial terrace was generally high compared to marine terrace. However, correlation beween SOC stock and soil age was lineraly and significantly positive for fluvial terraces which coverd Entisols, Inceptisols, and Ultisols, but the correlation was not significant for marine terraces with Entisols, Mollisols, and Vertisols. Indeedly, Ultisols played important roles for agricultural production and SOC storage in Taiwan. With respect to the Ultisols, the SOC stock with paddy rice was higher than that with upland uses like pineapple cropping. Although the SOC pools in Taiwanese rural lands is much lower than the other temperate countries of ASPAC regions, the strategies by prolonging waterlogged duration of paddy soils and by efficiently reusing crop residues for all rural soils proposed good ways to sequester SOC.

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