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頁籤選單縮合
題 名 | 不同土壤之地溫、水分與熱流之變化=Variations in Soil Temperature, Moisture and Heat Flux of Different Soil Types |
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作 者 | 徐森雄; 蔡奉廷; 楊婉嘉; 曾金楷; 吳建賢; | 書刊名 | 作物、環境與生物資訊 |
卷 期 | 2:3 民94.09 |
頁 次 | 頁201-210 |
分類號 | 434.222 |
關鍵詞 | 地溫; 土壤水分含量; 熱通量; 比熱; 孔隙率; Earth temperature; Soil moisture content; Heat flux; Specific heat; Porosity; |
語 文 | 中文(Chinese) |
中文摘要 | 摘要 本研究於國立屏東科技大學之教學氣 象站內進行,設置一土堆,土堆內以木樁區 隔成田字型,內有紅壤、泥岩、黃壤與砂土 四種土壤。從2002 年9 月至2003 年12 月 之觀測結果摘述如次:泥岩比熱只有0.19 calg-1℃-1,約為其它土壤的0.5 倍,且雖然 觀測到的熱通量僅為黃壤、紅壤的0.5 倍、 甚至只有砂土的0.3 倍,但其溫度仍容易改 變。降雨後,四種土壤水分到達飽和之速度 為紅壤>泥岩>黃壤>砂土。以2003 年6 月23 日至2003 年7 月3 日期間為例,各種 土壤於5 ㎝深度,其恢復至降雨前的水分含 量所需時間順序為:紅壤(100 hr)>黃壤(87 hr)>泥岩(76 hr)>砂土(72 hr)。增加土壤 中水分含量將增加土壤整體的傳熱性,紅 壤、黃壤與砂土等土樣之熱傳導係數與水分 含量均呈線性相關,惟泥岩性質特殊,並無 此現象。降雨過後,各土壤之熱通量明顯上 升,此現象以紅壤最為顯著。但水的存在將 提高土壤的整體比熱,所以地溫不容易升 高。 |
英文摘要 | ABSTRACT This study was conducted near the meteorological station of National Pingtung University of Science and Technology, by setting a pile of soil and using wooden stakes to divide it into four equal plots. Each squared plot was filled with red soil, mudstone, yellow soil, or sand. Based on the observation from Sep. 2002 to Dec. 2003, the obtained results can be summarized as follows. The specific heat of mudstone was 0.19 calg-1℃-1, which was about 0.5 times smaller than other kind of soils. The heat flux of mudstone with low specific heat was usually 0.5 times smaller than yellow soil and red soil, and 0.3 times smaller than sand. But its temperature was unstable. After the rainfalls, the speed to reach soil moisture saturation was in order of red soil>mudstone> yellow soil>sand. From June 23, 2003 to July 13, 2003, the time needed to recover back to the moisture content before the rainfall for each type of soil in 5 cm depth was in order of red soil (100 hr) > yellow soil (87 hr) > mudstone(76 hr) > sand(72 hr). Increase the percentage of moisture content in soil will increase the thermalconductivity of all soils. In this study, there was a liner relationship between the thermal conductivity and soil moisture in red soil, yellow soil, and sand. After the rainfalls, the heat flux of all soils, increased significantly with red soil increased the most. Although the moistness would increase the overall specific heat in soil, it would not simply increase the soil temperature. |
本系統中英文摘要資訊取自各篇刊載內容。