Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/65863
標題: 疏伐對惠蓀林場杉木人工林土壤呼吸之影響
Effects of Thinning on Soil Respiration at China-fir Plantation in Hui-Sun Experiment Forest
作者: 游偉青
Yu, Wei-Ching
關鍵字: China-fir;杉木;soil respiration;Continue-Open-Flow-Chamber method;thinning;litter fall;土壤呼吸;開放式連續抽氣法;疏伐;枯枝落葉
出版社: 森林學系所
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摘要: 
本試驗於惠蓀林場杉木人工林,選擇疏伐林及未疏伐林以開放式連續抽氣法進行土壤呼吸試驗,探討疏伐作業對於土壤呼吸的影響,其中兩林分又分為保留枯枝落葉及去除枯枝落葉兩種處理。自2004年11月至2006年2月試驗結果顯示,惠蓀林場杉木人工林土壤呼吸量因季節不同而異,疏伐林土壤呼吸量範圍從9.23 – 251.84 CO2 kg ha-1 day-1 (保留枯枝落葉) 及5.82 – 161.27 CO2 kg ha-1 day-1 (去除枯枝落葉);未疏伐林土壤呼吸量範圍為17.50 – 151.31 CO2 kg ha-1 day-1 (保留枯枝落葉) 及5.04 – 82.81 CO2 kg ha-1 day-1 (去除枯枝落葉)。疏伐之後林分溫度高於未疏伐林,尤以夏季更為明顯,其土壤呼吸量亦顯著大於未疏伐林;不論是疏伐林或未疏伐林,保留枯枝落葉處理者土壤呼吸量皆大於去除枯枝落葉處理者,亦以夏季最為明顯。疏伐林與未疏伐林土壤呼吸與土壤溫度顯著正相關,大於與大氣溫度的相關性。土壤呼吸在季節變化上皆與溫度有相同趨勢,夏季時土壤呼吸量大於冬季,但土壤呼吸於日變化上不顯著;因夏季為雨季,土壤呼吸與土壤含水量亦為正相關,但相關性小於與溫度的相關性,表示土壤呼吸受到溫度的影響較大。土壤無機態氮與土壤呼吸相關性不顯著,因此解釋土壤呼吸變異之能力低。試驗結果初步得到疏伐作業導致土壤呼吸增加,但疏伐去除生長劣質林木後留下之優質林木,生長迅速良好有利於林木固定碳,疏伐作業對於碳吸存究竟是正面或負面的影響仍有待進一步研究。

This study used Continue-Open-Flow-Chamber method to investigate the effects of thinning on soil respiration at China-fir plantation in Hui-Sun experiment forest. In thinned and un-thinned stands, litter layer was kept intact or removed. The soil respiration were measured from Nov. 2004 to Feb. 2006. The soil respirations of thinned stands were 9.23 - 251.84 CO2 kg ha-1 day-1 (with litter fall) and 5.82 - 161.27 CO2 kg ha-1 day-1 (without litter fall). The soil respirations of un-thinned stands were 17.50 - 151.31 CO2 kg ha-1 day-1 (with litter fall) and 5.04 - 82.81 CO2 kg ha-1 day-1 (without litter fall). The temperatures in thinned stands were higher than un-thinned stands and its seasonal patterns were similar to those of soil respirations. The diurnal change of soil respirations in this study were negligible. Soil respiration were in higher correlation with soil temperature than with air temperature. The CO2 emission from soils with litter fall were higher than those of without litter fall. Caused by heavy rain and high moisture in summer, the soil respiration were positive correlation with temperature and moisture. Meanwhile the correlations between soil respirations and temperature were higher than correlation with moisture. It means that temperature was the major factor influenced on soil respirations in this study. The results showed that thinning led to increasing of soil respirations; however the reserve trees could grow faster and sequestrate more carbon. Thus the effects of thinning on carbon storage in forest are still researching subject in future.
URI: http://hdl.handle.net/11455/65863
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