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題 名 | 擾動地先驅樹種對養分逆境之生理反應=The Physiological Responses of Pioneer Trees of Disturbed Land to Nutrient Stress |
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作 者 | 章裕賓; 林信輝; | 書刊名 | 農林學報 |
卷 期 | 45:3 1996.09[民85.09] |
頁 次 | 頁13-27 |
分類號 | 373.1 |
關鍵詞 | 擾動地; 先驅樹種; 養分逆境; 淨光合成率; 生理反應; Disturbed land; Pioneer trees; Nutrient stress; Net photosynthetic rate; Physiological responses; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究選取擾動地先驅樹種山鹽菁(羅氏鹽膚木)及山水柳(木苧麻)為植物材 料,以砂耕法進行試驗,了解在不同氮、磷、鉀、鈣及鎂等養分處理下,山鹽菁及山水柳之 生理反應。茲將所得結果節錄如下: 1.不同養分濃度處理後,山鹽菁植物體主要營養元素含量彼此間之相關性較山水柳高。山 鹽菁植物體之鈣、鈉含量明顯的低於山水柳。兩種植物在鉀離子缺乏時均出現了鈉離子替代 情形。 2.在氮、鉀及鎂的養分缺乏時,山鹽菁及山水柳老葉之淨光合成率下降量高於新葉。磷養 分缺乏時,山水柳的淨光合成率有明顯的下降趨勢,而山鹽菁之相關性較不顯著。在缺鈣時 ,山鹽菁之淨光合成率受影響程度高於山水柳。 3.山鹽菁細胞間隙二氧化碳濃度與葉片外二氧化碳濃度之比值( Ci/Ca )在 0.7-0.85 之間,明顯低於山水柳之 0.85-0.95, 顯示山鹽菁具有較高的用水效率。 山水柳之 Ci/Ca 值均隨氮、磷、鉀及鎂不足而升高,但較不受鈣濃度之影響。而山鹽菁對各元素處理濃度之 反應較不具規律性。 4.兩種植物之葉綠素含量均因氮、鎂及鉀之缺乏而減少,其中老葉之影響較為嚴重。在磷 的逆境下,二種植物之老葉均發生過綠的現象。 |
英文摘要 | Two pioneer trees of disturbed lands, Roxburgh Sumac and Dense-flowered False-nettle, were chosen to test on the various limited nutrient concentration of nitrogen, phosphorus, potassium, magnesium and calcium by sand culture method. The measured items were inclusive of plant tissue element content, leaf photosynthetic gas exchange and chlorophyll content etc. Result obtained are summarized as follows: 1. According to the results of various nutrient treatment testing, Roxburgh Sumac showed higher relationship among each plant tissue element content. The calcium and sodium content of plant tissue of Roxburgh Sumac was lower than those of Dense-flowered False-nettle. 2. Net photosynthetic rate of both trees old leaf were greater decrease due to nitrogen, potassium and magnesium deficiency than that of new leaf. While phosphorus deficiency, Pn of Dense-flowered False-nettle was decrease significantly, but that of Roxburgh Sumac was not. Pn of Roxburgh Sumac affected by calcium deficiency was greater than that of Dense-flowered False-nettle. 3. The Ci/Ca ratio of Roxburgh Sumac was 0.70-0.85, while Dense-flowered False-nettle was 0.85-0.95. That indicated Roxburgh Sumac has higher water use efficiency. The Ci/Ca ratio of both trees was greater due to nitrogen, phosphorus, potassium or magnesium deficiency, but not related to calcium. 4. Leaf chloropyll contents of two tested trees were decreased to various nitrogen, potassium, and magnesium deficiency, but were increased to phosphorus deficiency contrastly. |
本系統中英文摘要資訊取自各篇刊載內容。