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研究生:趙惠德
研究生(外文):Hui-Te Chao
論文名稱:不同光度及施肥量對烏心石苗木形態及生理之影響
論文名稱(外文):The Effects of Different Light Intensities and Fertilizer Levels on the Morphological and Physiological Characteristics of Formosan Michelia Seedlings
指導教授:郭幸榮郭幸榮引用關係
指導教授(外文):Shing-Rong Kuo
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:森林學研究所
學門:農業科學學門
學類:林業學類
論文種類:學術論文
論文出版年:2000
畢業學年度:88
語文別:中文
論文頁數:55
中文關鍵詞:烏心石光度施肥光合作用
外文關鍵詞:Michelia compressaMaxim.SargentFormosan michelialight intensityfertilizerphotosynthesis
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本研究旨在探討烏心石苗木在不同光度及施肥量處理下,其形態暨生理之變化。
生長環境之光度不但影響生物量之生產及分配,也改變礦質養分在植物體之濃度。苗木之地際直徑生長、地下部乾重、全株乾重、R/S率、Dickson品質指數等均隨光度之提高而增加。但植物體內氮、磷、鉀濃度,以及介質之pH值、鈣、鎂濃度均隨光度之提高而降低。
遮蔭環境生長之苗木,在低光度下之淨光合速率較生長在高光度者為高,亦具有較低之光補償點光度。苗高生長、SLA、LAR及葉綠素濃度亦隨遮蔭度提高而增加。但光度超過30μmol m-2 s-1後,淨光合速率隨處理光度之提高而上升。因此,烏心石苗木對生長環境之光量具有生理及形態之可塑性,在低光度下可改變其特性,以有效捕獲或利用光能。
施肥量亦影響烏心石生物量之生產、各部位之分配比例,以及植物體礦質養分之濃度。苗高、地際直徑生長、各部位乾重、Dickson品質指數,以及植物體氮、鉀濃度等均隨施肥量之提高而增加。但R/S率、植物體鈣、鎂濃度,以及介質之鎂濃度、pH值均隨施肥量提高而下降。
SLA雖不受施肥量之顯著影響,但LAR及葉綠素濃度均隨施肥量提高而上升。高施肥量之苗木在低光度下之淨光合速率較低,光補償點光度亦較高。但在較高光度下,淨光合速率及光飽合點淨光合速率均隨施肥量之提高而上升,顯示施肥亦可改變烏心石苗木之生理反應。
除苗高生長外,其餘形態及生理反應均不受光度及施肥處理交感效應之影響。
依據本研究之處理組合,烏心石一年生苗木之培育條件,以相對光度65%配合施用每公頃1,875公斤之臺肥5號肥料較為理想,此重量之肥料約含氮300公斤、磷64.44公斤及鉀186.70公斤。
This study investigated the morphological and physiological changes of potted seedlings of Formosan michelia (Michelia compressa (Maxim.) Sargent) grown under different light intensities with different levels of compound fertilizer.
The results showed that productions and partition of biomass and nutrient element concentrations of the seedlings varied with light intensity. Growth of root collar diameter, total biomass, dry matter of roots, R/S ratio and Dickson quality index of the seedlings were increased with increasing relative light intensity. But N, P and K concentrations of seedlings, as well as Ca, Mg concentrations and pH value of growth media were inversely correlated with light intensity.
Net photosynthetic rate of seedlings was increased with increasing degree of shading when the seedlings were exposed in low light intensity. Light compensation point of seedlings which grown in lower light intensity was lower and the height growth, SLA, LAR and chlorophyll contents were higher than those grown in higher light intensity. However, net photosynthetic rate of latter was higher than former when they were exposed in the light intensity higher than 30μmol m-2 s-1. The morphological and physiological changes of Formosan michelia seedlings revealed the adaptability to variation of light intensity in field.
The levels of fertilizer affected productions and partition of biomass and nutrient element concentrations of the seedlings. Height growth, root collar diameter, dry matter, Dickson quality index, N, K concentrations of seedlings were increased when the amounts of fertilizer were increased, however, their R/S ratio, Ca and Mg concentration were decreased.
The SLA was slight affected by the fertilization, but the LAR and chlorophyll concentration were increased with increasing amounts of fertilizer. Net photosynthetic rates of fertilized seedlings were higher, but the light compensation points when they were exposed in lower light intensity. However, net photosynthetic rate and light saturation point were increased with the fertilizer levels when they were exposed in higher light intensity, indicating the physiological attributed of Formosan michelia seedlings were affected by fertilizer levels.
The morphological and physiological attributes but not the height growth were not affected by the interaction of light and fertilization.
It was concluded that in 65% of full daylight and 1,875 kg/ha of Tai-fay #5 compound fertilizer which contained 300 kg N, 64.44 kg P and 186.70 kg K are optimum for one-year-old seedlings of Formosan michelia.
壹、前言
貳、前人研究
一、烏心石育苗之相關研究
二、林木與光之相關性
三、不同光度對植物之影響
四、礦質養分
參、材料與方法
一﹑試驗材料及方法
(一)苗木之培育
(二)試驗設計及處理
二﹑苗木形質生長之測定
(一)苗木生長及形態性狀之測定
1.苗高及地際直徑增長量
2.乾重及R/S率
3.Dickson苗木品質指數
4.單株總葉面積
5.比葉面積及葉面積比
(二)生理性狀之測定
1.葉綠素濃度之測定
2.淨光合速率
(三)植物體礦質養分濃度之測定
1.凱氏氮測定
2.磷、鉀、鈣、鎂之測定
三、培育介質化學性質之測定
(一)pH值之測定
(二)凱氏氮
(三)有效磷
(四)交換性鉀、鈣、鎂濃度之測定
四、資料分析
肆、結果
一、形質反應
(一)苗高增長量
(二)地際直徑增長量
(三)苗木乾重及R/S率
1.地上部乾重
2.根系乾重
3.全株乾重 22
4.R/S率
5.Diskson苗木品質指數
6.葉片形態
二、對生理特性之影響
(一)淨光合速率
(二)葉綠素濃度
三、對植物體礦質養分之影響
(一)葉部礦質養分
(二)莖部礦質養分
(三)根部礦質養分
四、對介質礦質養分及pH值之影響
(一)介質礦質養分
(二)介質pH值
伍、討論
一、對苗木生長性狀之影響
二、對葉部形態之影響
三、對生理特性之影響
四、對植物體礦質養分之影響
五、對介質礦質養分及pH值之影響
陸、結論
柒、參考文獻
捌、附錄
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