溪頭柳杉人工林疏伐處理對於土壤養份動態之影響

Effect to Thinning on Soil Nutrient Dynamics of Japanese Plantation at Sitou Region

余瑞珠(Jui-Chu Yu) ； 江博能(Po-Neng Chiang) ； 江凱楹(Kai-Ying Chiang) ； 王亞男(Ya-Nan Wang) ； 王明光(Ming-Kuang Wang)

《中華林學季刊》 41卷3期 (2008/09) Pp. 365-376

https://doi.org/10.30064/QJCF.200809.0006

摘要

本研究探討柳杉人工林疏伐處理對土壤養份動態之影響。實驗結果顯示疏伐後土壤pH值較未疏伐高。可交換性鉀、鈉和鈣於未疏伐柳杉林有較高的含量。在鎂離子濃度的方面，疏伐處理的數值比未疏伐的高。疏伐後總鹽基陽離子含量較未疏伐增加，這可能是疏伐後枯枝落葉分解後將植體中陽離子釋出所致。疏伐前後土壤的全碳量、全氮量以及碳氮比的並沒有顯著差異。然而13C NMR分析結果顯示疏伐後柳杉林纖維素與半纖維素分解是主要的過程，並且進而釋出養份至土壤中。

關鍵字

碳氮比 ； 柳杉 ； 疏伐

並列摘要

This study aimed to investigate the effect of soil nutrient dynamic with thinning treatment of Japanese cedar (Cryptomeria japonica). Soil pH is higher in thinning treatment than that in control. Exchangeable potassium, sodium and calcium are higher in control site. Exchangeable magnesium contents are lower in control than that in thinning treatments. Sum of cations are increased in thinning treatment than that in control, indicating that litter is decomposed and cations release after thinning treatment. Total C and N contents, and C/N ratio do not show any significant difference between thinning treatment and control. However, 13C NMR spectra indicate the cellulous and hemicellulous decomposition is the main process releasing nutrient to soil.

並列關鍵字

C/N ratio ； Cryptomeria japonica ； Thinning