臺大實驗林臺灣櫸造林地林分土壤呼吸量

Soil Respiration in a Taiwan Zelkova Plantation in National Taiwan University Experimental Forest

陳潔音(Chieh-Yin Chen) ； 顏江河(Chiang-Her Yen) ； 蕭文偉(Wen-Wei Hsiao) ； 王亞男(Ya-Nan Wang) ； 郭福麟(Fu-Lin Kuo)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 29卷3期 (2015/09) Pp. 161-171

https://doi.org/10.6542/EFNTU.2015.29(3).2

摘要

土壤呼吸是土壤碳庫將碳輸出至大氣圈和生物圈的主要途徑，全球森林之土壤呼吸量測研究已多所著墨，然國內有關森林土壤之二氧化碳研究尚稱缺乏。本研究於臺大實驗林內茅埔臺灣櫸造林地進行，設置去除枯落物與對照處理，利用自行設計之開放式連續抽氣法，對不同處理之土壤呼吸進行18個月之連續監測，探討土壤溫度、水分與有機質影響土壤呼吸之效應，可瞭解森林對碳吸存之生態功能，以提供人工林的經營參考。試驗自2006年5月至2007年10月止，結果顯示臺灣櫸人工林土壤呼吸速率因季節不同而異，白天介於11.80～201.93 kg CO2 ha-1 d-1之間，夜晚介於5.64～74.90 kg CO2 ha-1 d-1之間，土壤溫度範圍為11.5～24.23℃。土壤呼吸以夏季高於冬季、白天高於夜晚，與大氣溫度有顯著正相關，與土壤含水率及土壤有機質無顯著相關性。

關鍵字

臺灣櫸 ； 造林地 ； 土壤呼吸 ； 枯落物 ； 內茅埔

並列摘要

Soil respiration is a major carbon flux within terrestrial ecosystems as well as between the biosphere and the atmosphere. Soil CO_2 efflux has been measured in many forests all over the world. However, only a few of these data concern Taiwan forests. A litter manipulation experiment was carried out in 10-year-old Taiwan zelkova (Zelkova serrata (Thunb.) Makino) plantation in Neimaopu tract of National Taiwan University Experimental Forest between May 2006 and October 2007. Two treatments including litter exclusion and retainment were conducted. Soil respiration rate was measured monthly by Continue-Open-Flow-Chamber designed by this study and soil temperature, moisture and organic matter were also measured. This study aimed to explore ecological function of carbon sequestration in forests and to provide guidance for plantation management. The results showed that soil respiration rate varied from 11.80 to 201.93 kg CO_2 ha^(-1) d^(-1) and from 5.64 to 74.90 kg CO_2 ha^(-1) d^(-1) for daytime and nighttime, respectively. Soil temperature in the plantation ranged from 11.5 to 24.23℃. Soil respiration rate in summer was higher than in winter, and was higher in daytime than in nighttime. Within the same measuring period, the litter exclusion treatment had significantly lower soil respiration than the litter retainment treatment. Seasonal change in the soil respiration rate of both treatments correlated strongly with temperature. Soil water content and organic matter had minor relevance to soil respiration.

並列關鍵字

Zelkova serrata ； plantation ； soil respiration ； litter ； neimaopu