Using forest site patch to estimate the soil organic carbon in Puli and Luanda Forest Working Circles

• Main Authors: Yu-Ju Shiang, 向韻如
• Other Authors: Chiang-Her Yen
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/39316252936621520290

碩士 === 中興大學 === 森林學系所 === 94 === Soil organic carbon pool is significantly influenced by some environmental factors, such as elevation, topography and vegetation type. In this study we used forest site patch method which was divided or merged by elevation ( 0 - 1499, 1500 - 2500, > 2500 m ), aspect ( N-NE, E-SE, S-SW, W-NW ), slope ( 0 - 15°, 16 - 35°, > 36° ) and forest type ( plantation and natural forests ) to estimate soil organic carbon pool in Puli and Luanda Forest Working Circles. The areas of Puli and Luanda forestland were about 27,132 and 57,545 ha, which could be compartmented into 55 and 65 patches, respectively. The results showed that total contents of soil organic carbon estimated by this study were about 5293.34 kt and 13021.77 kt, and the contents of fine soil organic carbon were 3506,99 kt and 7705.87 kt in Puli and Luanda forestland, respectively. The contents of litterfall carbon accounted for 6 % and 9 - 10 % of the total soil organic carbon and the fine soil organic carbon. Results also showed that soil bulk density, fine soil density and soil pH were decreased with increasing elevation and had negative correlation with soil organic carbon concentration and carbon content. Different elevation had significantly influenced on litterfall carbon concentration and carbon content, they were increased with raising elevation. Soil organic carbon content can be explained by aspect and elevation. However, the fine soil organic carbon can be clarified by aspect, elevation and slope. It’s exposition that the fine soil organic carbon content was more representative than the soil organic carbon content in different patches. The significance of individual environmental factors influenced on soil carbon were generally in the order of elevation > aspect > slope > forests type. Soil organic carbon and fine soil organic carbon content was increased with elevation, which had highest carbon content at middle elevation and followed by a slow decline at higher elevation. Soil organic carbon content at different aspect had the order of E-SE > S-SW > W-NW > N-NE. Otherwise plantation and natural forests had the same soil organic carbon contents. It was supposed that the variable vegetation overcome the soil organic carbon content between the two forest types. Furthermore, the interaction of each factors of this study had highly influenced on soil and fine soil organic carbon content. In ours demonstrates the forest site patch method can express different soil carbon pool between all forestland. Thus, the forest site patch method could provide an advantageous mode to estimate soil organic carbon pool in complicated landforms.