亞高山地區草原與森林土壤腐植酸之比較

Comparison of the Humic Acids Extracted from Grassland and Forest Soils at Subalpine Area

曾聰堯(Tsung-Yao Tseng) ； 王亞男(Ya-Nan Wang) ； 林國銓(Kuo-Chuan Lin) ； 杜清澤(Chin-Tzer Du) ； 王明光(Ming-Kuang Wang) ； 江博能(Po-Neng Chiang) ； 葉旭容(Hsun-Jung Yeh)

《中華林學季刊》 42卷2期 (2009/06) Pp. 219-226

https://doi.org/10.30064/QJCF.200906.0003

摘要

Humic substances (HSs) are the high organic polymers that derived from humicification of organism of soils. Humic substances are greatly affected by vegetation. The objective of the study was to compare the humic acids (HAs) under grassland and forest soils of subalpine area. The surface soils (0-15 cm) were collected, and humic acids were extracted, isolated and purified by International Humic Substances Society (IHSS) methods. Humic acids were determined using elemental analyzer, solid-state 13C-NMR spectroscopy and FTIR. Organic carbon and nitrogen contents of forest surface soils were higher than grassland. The main composition of HAs were the compounds that decomposed by microrganism. The contents of different functional groups of HAs show the following trend: Alkyl-C＞O-Alkyl-C＞N-Alkyl-C, Aromatic-C＞Carboxyl-C＞Acetal-C＞Phenolic-C. The C/N atomic ratio of HAs under forest (30.59) was greater than grassland (18.15), which means the slow rate of decomposition of forest, however, the balance of decomposition was achieved of the grassland. Therefore, the degree of humification of soils was grassland＞forest.

關鍵字

土壤腐植酸 ； 草原 ； 森林 ； 植群 ； 碳十三核磁共振

並列摘要

Humic substances (HSs) are the high organic polymers that derived from humicification of organism of soils. Humic substances are greatly affected by vegetation. The objective of the study was to compare the humic acids (HAs) under grassland and forest soils of subalpine area. The surface soils (0-15 cm) were collected, and humic acids were extracted, isolated and purified by International Humic Substances Society (IHSS) methods. Humic acids were determined using elemental analyzer, solid-state 13C-NMR spectroscopy and FTIR. Organic carbon and nitrogen contents of forest surface soils were higher than grassland. The main composition of HAs were the compounds that decomposed by microrganism. The contents of different functional groups of HAs show the following trend: Alkyl-C＞O-Alkyl-C＞N-Alkyl-C, Aromatic-C＞Carboxyl-C＞Acetal-C＞Phenolic-C. The C/N atomic ratio of HAs under forest (30.59) was greater than grassland (18.15), which means the slow rate of decomposition of forest, however, the balance of decomposition was achieved of the grassland. Therefore, the degree of humification of soils was grassland＞forest.

並列關鍵字

Soil humic acids ； Grassland ； Forest ； Vegetation ； 13C-NMR