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研究生:程梅萍
研究生(外文):Cheng,Mei-Ping
論文名稱:台灣地區土壤硝化作用及其影響因子之研究
論文名稱(外文):Studies of the Nitrification of Soils and Its Affecting Factors in Taiwan
指導教授:王西華
指導教授(外文):Wang,Hsi-Hua
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:農業化學系
學門:農業科學學門
學類:農業化學類
論文種類:學術論文
論文出版年:1993
畢業學年度:81
語文別:中文
論文頁數:84
中文關鍵詞:硝化作用逐步迴歸數學模式自淨能力
外文關鍵詞:NitrificationStepwise RegressionMathematical ModelAssimilative Capacity
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本研究評估以兩種數學模式預估臺灣地區土壤硝化作用速率的可行性,一
是利用硝化作用參數的影響因子迴歸方程式及硝化作用方程式預估已知環
境條件、土壤性質、硝化菌數目等的土壤,施入銨氮後的硝化作用速率。
結果以台中土添加1280ppm銨態氮為例預估值與實驗值的R平方值達0.92,
相當符合實驗結果。 但是必須測定的影響因子有八個。因此,第二種方
法嘗試只以硝化菌菌數乘以每一菌細胞硝化速率估算硝化作用速率。結果
以亞硝酸氧化菌菌數乘每一菌細胞硝化速率估算硝化作用速率相當可行且
簡便,並可做為土壤受氮污染的指標。此外,本研究以數學迴歸式定量描
述硝化作用影響因子對於硝化作用參數的影響;並以逐步迴歸分析判定影
響因子的重要性。結果最大硝化作用速率的影響因子重要性依次為自營性
氨氧化菌數、銨態氮濃度、水分張力、土壤陽離子交換能力。而最大硝化
作用速率與銨態氮濃度、pH值、自營性氨氧化菌數、自營性亞硝酸氧化菌
數、土壤黏粒含量呈正比。水分張力、有機物含量及土壤陽離子交換能力
與最大硝化作用速率呈反比。
Two mathematical models were used to predict the
nitrification rate of Taiwan soil in this study. One was
using the multiple factors'' regression equation of
nitrification parameter(Laubscher ,1990) and the nitrification
equation to predict nitrification rate of the soil whose
properties, environmental conditions and nitrifier population
were known. The results showed that this model got a good
predict value ( R square 0.92 in Taichung soil). But there were
eight factors needed to be measured in this model. Therefore,
the other model was only using the population of nitri- fiers
multiplying the nitrification rate per cell to estimate the
soil nitrification rate. The results showed that the
population of nitrite oxidizer multiple the nitrification
rate per cell could estimate the nitrification rate and
could be used as an indicator of nitrogen pollution of
chemical fertilizer in soils. Stepwise regression analysis
was used to identify the factors regulating nitrification and
regression equations were used to quantatively describe the
factors regulating the nitrification parameters. The former
showed that the factors regulating the maximal
nitrification rate were the population of autotrophic
ammonia oxidizer, the initial ammonium concerntration,
water tension and cation exchange capacity of soils. The
latter showed that the maximal nitrification rate positively
correlated with initial ammoniumcon-centration, pH value,
the population of autotrophic nitrifiers, and clay content in
soils, but negatively correlated with water tension, organic
matter content and cation exchange capacity in soils.
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