以林地區塊法估算埔里及巒大事業區森林土壤有機碳庫

Using Forest Site Patches to Estimate the Soil Organic Carbon Pool in the Puli and Luanda Forest Working Circles

顏江河(Chiang-Her Yen) ； 向韻如(Yu-Ju Shiang)

《台灣林業科學》 22卷4期 (2007/12) Pp. 469-482

https://doi.org/10.7075/TJFS.200712.0469

摘要

本研究以埔里及巒大事業區為樣區範圍， 在人工林及天然林中， 於不同海拔(0~1499、1500~2499、≧2500m)、坡向（北至東北、東至東南、南至西南、西至西北）及坡度(0°~15°、16°~35°、≧36°)，進行林地之區塊化，以估算土壤有機碳庫。埔里事業區林地面積27,132ha，土壤總有機碳量估算為5.29Tg，細土總有機碳量為3.51Tg，巒大事業區林地面積57,545ha，土壤總有機碳量為13.0Tg，細土總有機碳量為7.71Tg，其中枯落物總碳量分別約佔土壤總有機碳庫之6%及細土總有機碳庫之9~10%左右。土壤有機碳濃度及碳含量，從低海拔隨著高度而增加，至中海拔達最大值，高海拔呈緩降之勢。土壤碳濃度及碳含量不同坡向皆呈現東至東南＜南至西南＜西至西北＜北至東北之趨勢；此外，本試驗中土壤有機碳及細土有機碳之含量，於各因子間之交感皆呈顯著差異，顯示區塊與區塊間之差異性明顯，使林地區塊法能夠確實區分出不同區塊之土壤有機碳庫，此對於台灣複雜地形之碳庫可提供一個有利之估算方式。

關鍵字

林地區塊法 ； 土壤有機碳庫 ； 海拔 ； 坡向 ； 坡度 ； 林型

並列摘要

The soil organic carbon pool is significantly influenced by certain environmental factors, such as elevation, topography, and vegetation type. In this study, we used the forest site patch method, divided or merged by elevation (0~1499, 1500~2499, and ≧2500m), aspect (N-NE, E-SE, S-SW, and W-NW), slope (0°~15°, 16°~35°, and ≧36°), and forest type (plantation and natural forests), to estimate the soil organic carbon pool in the Puli and Luanda Forest Working Circles. The areas of the Puli and Luanda forestland were about 27,132 and 57,545ha, 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 5.29Tg and 13.0Tg, and the contents of fine soil organic carbon were 3.51Tg and 7.71Tg in Puli and Luanda forestlands, respectively. Soil organic carbon and the fine soil organic carbon content increased with elevation; the highest carbon content was observed at mid-elevations followed by a slow decline at higher elevations. The soil organic carbon content for different aspects was in the order of E-SE＞S-SW＞W-NW＞N-NE. Furthermore, interactions of factors of this study that highly influenced soil and fine soil organic carbon contents showed that each patch significantly differed from each other. This demonstrates that the forest site patch method can express different soil carbon pools among all forestland patches types. Thus, the method provides a satisfactory mode system to estimate soil organic carbon pools in complicated landforms.

並列關鍵字

forest site patch ； soil organic carbon pool ； elevation ； aspect ； slope ； forest type