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題 名 | 臺灣旱田土壤脫氮特性 |
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作 者 | 趙震慶; 楊秋忠; | 書刊名 | 中華農學會報 |
卷 期 | 169 1995.03[民84.03] |
頁 次 | 頁70-89 |
分類號 | 434.225 |
關鍵詞 | 土壤; 有機農耕法; 脫氮菌; 脫氮酵素活性; 脫氮潛勢; Soil; Organic farming; Denitrifying enzyme activity; Denitrifier; Denitrification potential; |
語 文 | 中文(Chinese) |
中文摘要 | 生物異化脫氮作用造成農業生產成本增加外,所生成之氧化亞氮為大氣中具有溫室效應主要微量氣體之一。本研究採及本省西部五個土系七種旱田土壤,觀測土埌脫氮菌數,脫氮酵素活性及脫氮潛勢等土壤脫氮特性,以建立臺灣土壤脫氮作用之部份基本資料。 最大可能數法(MPN法)測脫氮菌數,二分之一推荐濃度的營養液(nutrient broth)優於其他兩種濃度較高或低之營養液及不同濃度之胰大豆蛋白液(tryptic soy broth)。所測七種土壤中脫氮菌數之對數值由7.18至4.15/克乾土。所測試之起種土壤脫氮酵素活性,所需之葡萄糖碳量較推荐法為高,各土壤脫氮量對時間所求得直線迴歸式的斜率,以二林系壤土之0.003ng N₂O-N/克乾土/分鐘為最低,而以平鎮系粘質壤土之3.091ng N₂O-N/克乾土/分鐘為最高。測定七種土壤脫氮潛勢時,對葡萄糖需求量五種土壤趨向400μg/克土以上之高用量。時間對土壤脫氮量所求得之直線迴歸式的斜率,以平鎮系粘質壤土0.470μg N₂O-N/克乾土/小時為最低,和興系坋質壤土有機農法是區之土壤2.699μg N₂O-N/克乾土/小時為最高。土壤長期施用廐肥,可增加土壤脫氮酵素活性及脫氮潛勢。 |
英文摘要 | Denitrifying enzyme activity, denitrification potential and denitrifier popultions as determined by most-probable-number counts were measured in seven upland soils of Taiwan. Half concentration of nutrient broth with nitrate for testing of denitrifier by most-probable-number counts in anaerobic condition was probably more appropriat4e than other concentration of nutrient broth and two concentrations of tryptic soy broth. The logarithmic most-probable-number of denitrifier in seven upland soils were 4.15 to 7.18 g⁻¹ dry soil. It was need more glucose carbon required than recommended methods for denitrifying enzyme activity and denitrification potential measurements. The slopes of linear regression for N₂O formation in denitrifying enzyme activity and denitrification potential in seven upland soils of Taiwan were ranged from 0.003 to 3.091 ng N₂O-N g⁻¹ dry soil min⁻¹, and 0.470 to 2.699 ug N₂O-N g⁻¹ dry soil hr⁻¹, respectively. The slope in denitrification potential for Tali loam soil was higher than that of Pinchen acid by loam soil, and for the soils of organic farming were more higher than that of conventional farming soils. |
本系統中英文摘要資訊取自各篇刊載內容。