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標題: | 探討彰化、雲林灌溉水與土壤飽和抽出液電導度之關係 The Relationship between Electrical Conductivity of rrigation Water and Soil Saturation Extract in Changhua and Yunlin Rice Fields |
作者: | Sheng-Chi Lin 林聖淇 |
指導教授: | 張尊國(Tsun-Kuo Chang) |
關鍵字: | 電導度,淋洗率,灌溉水, Electrical conductivity,Leaching fraction,Irrigation water, |
出版年 : | 2006 |
學位: | 碩士 |
摘要: | 在探討鹽分對作物的影響時,學理上係檢測土壤飽和抽出液電導度值(ECs)作為判別影響作物生長之標準,然在實務上,多以直接量測灌溉水電導度值(ECi)為參考之依據。本研究建立水田鹽分平衡模式,透過模擬水田水平衡方式探討灌溉水電導度與其土壤飽和抽出液電導度比值(ECi/ECs )和淋洗率與稻作蒸發散量的關係,其目的是希望了解水田的土壤在長時間浸水的情況下,土壤鹽分累積的變化。本研究分別針對研究區域(彰化、雲林)農田土壤採樣分析,配合水質監測資料來驗證模式。根據當地氣候條件推估稻作蒸發散量以及土壤質地因子計算水田土壤深層滲漏量後,得知模式計算ECi/ECs 的範圍介於0.59∼0.72;而現地採樣ECi/ECs所得平均值的範圍介於0.61∼0.76。
經由兩次土壤採樣的統計分析得知,研究區域土壤裡所累積的鹽分含量並沒有達到土壤涵容能力之飽和狀態。假設研究區域內水稻收穫量在不減產以及相同之灌溉管理條件下,建議在不同土壤質地的水田裡,所能允許灌溉水電導度最大值分別為1.83 dS/m(砂質土壤)、1.70 dS/m(坋質土壤)以及1.57 dS/m(黏質土壤),可在將來檢討臺灣地區水田之灌溉用水水質標準時之參考。 In general, when we discuss the influence of salinity on crops, the most frequent index used is the electric conductivity(EC) of irrigation water in stead of the soil extract. This study constructes the salt balance model of rice fields through the simulation of water balance equation to understand the relationship between the EC of the irrigation water(ECi) and the saturated soil extract(ECs). The object of the study is that the change of the accumulated salt soil under the soil condition with full of water for a long period of rice growth. The model is verified by both ECs and ECi measured in situ in Changhua and Yunlin county. According to the estimation of crops Evaportranspiration based on the local condition of climate and percolation, the ratio range (ECi/ECs) of calculation of model is 0.59-0.72, and the ratio range (ECi/ECs) measured in situ is 0.61-0.76. In view of the statistic analysis from twice sampling soils in the rice fields, the content of the accumulated salt in soil doesn’t reach its capacity. If the rice yield doesn’t drop in production under the same irrigation management, the study will suggest that the most allowable maximum ECi specifically are 1.83 dS/m in sandy-loam, 1.70 dS/m in silt-loam and 1.57 dS/m in clay-loam. In the future, these indexes will be reference materials when we want to adjust the irrigation water quality standard in Taiwan. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31810 |
全文授權: | 有償授權 |
顯示於系所單位: | 生物環境系統工程學系 |
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