中臺灣柳杉人工林土壤呼吸空間與時間上的變化

Spatial and Temporal Variation of Soil Respiration in Crypotomeria japonica Plantation Forest in Central Taiwan

余瑞珠(Jui-Chu Yu) ； 江博能(Po-Neng Chiang) ； 賴彥任(Yen-Jen Lai)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 32卷4期 (2018/12) Pp. 307-322

https://doi.org/10.6542/EFNTU.201812_32(4).0005

摘要

本研究以中臺灣人工林土壤呼吸時間與空間變化為探討對象，並研究土壤呼吸過程與環境影響之機制。本試驗區以柳杉人工林二氧化碳通量塔樣區，選擇1 km^2範圍並分成16個大樣區進行生物與環境調查並進行土壤呼吸試驗。本研究中年平均土壤呼吸量為6.70 Mg C ha^(-1) year^(-1)。土壤溫度在時間變化下與土壤呼吸速率呈指數顯著相關，表示土壤溫度為主要控制土壤呼吸速率主要因子。土壤水分含量與土壤呼吸速率則無顯著相關，但以土壤溫度與土壤水分含量雙因子導入指數函數模式中進行飾配，其相關係數較單一土壤溫度指數模式提升，且仍具顯著性，尤其是當雨季後土壤溫度仍維持高溫，土壤水分對於土壤呼吸速率反應仍扮演一定的角色。

關鍵字

土壤呼吸 ； 森林 ； 亞熱帶

並列摘要

The aim of this study was to investigate temporal and spatial variation of soil respiration of plantation in central Taiwan. We also studied the mechanism of soil respiration (SR) processes and environment impact. The CO_2 flux site, which located at Japanese cedar plantation, was selected and divided to 16 plot in 1 km^2 for environmental, biological and soil respiration survey. The results showed that the average SR amount was 6.70 Mg C ha^(-1) year^(-1). Soil temperature (ST) was significantly related with SR rate in temporal variation indicating that ST was the dominant factor controlling SR rate. Soil water content (SM) was not significantly related with SR rate, but the fitting of ST and SM into the exponential function model was enhanced by both factors, and the correlation coefficient was higher than that of the single soil temperature exponential model, and remained significant, especially when the soil temperature maintained at a high temperature after the rainy season.

並列關鍵字

soil respiration ； forest ； subtropical