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來源資料
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題名 | 從土壤物理性來探討高溫砂地之灌溉因子 |
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作者姓名(中文) | 鄧東茂; 張世光; 施嘉昌; | 書刊名 | 農業工程學報 |
卷期 | 34:3 1988.09[民77.09] |
頁次 | 頁12-17 |
分類號 | 434.2571 |
關鍵詞 | 土壤; 因子; 物理性; 砂地; 高溫; 灌溉; |
語文 | 中文(Chinese) |
中文摘要 | 本研究之試驗係在沙烏地阿拉伯中南部窪地地區進行。試驗區之土壤屬砂土,其質地86.8﹪為砂粒,7.77﹪為坋粒,以及5.43﹪為粘粒所組成。該地區年平均最低溫度為33.4℃,年平均降雨量則少於50公厘。 本試驗共選了三個測點,每一測點之面積為一平方公尺。在三測點中分別灌了50、75及100公厘的水。灌水後,在50公厘之測點上覆蓋塑膠布以防止蒸發,其餘二測點則未作任何處理。 灌溉後,土層中之水分變化係利用重力法測定。測定時,每深度20公分處採一土樣,共採三層至60公分為止。由土壤水分之變化顯示,高溫砂地每次最適當之灌水量為70至80公厘,其灌水期距則為4至5天。試驗結果亦顯示出,在?高溫砂地施行覆蓋時對土壤水分之保持影響不大。 |
英文摘要 | Research was conducted in Wadi Dawasir, Saudi Arabia. The soil at the experimental site was classified as sandy soil which contained 86.8% sand, 7.77% silt, and 5.43s% clay. The annual average minimum temperature in Wadi Dawasir was 33.4℃ with an annual average precipitation of less than 50mm. In this study, three experimental plots (1×1m²) were selected and irrigated with 50,75 and 100 mm of water respectively. During the post irrigation period, The plot irrigated with 50mm of water was mulched with plastic sheet for preventing evaporation, and the other two plots were left exposed. Changes of water content in the profile during the post irrigation redistribution process were determined periodically by gravimatric method. The samples were taken 20 cm interval along the profile up to 60 cm depth. The results showed that the optimal amount of water for each irrigation was around 70 to 80 mm of water, and the irrigation interval was about 4 to 5 days. Additionally, the results also showed that mulched and non-mulched of the desert sandy soil had not much influenced on preventing evaporation of water from the profile. |
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