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頁籤選單縮合
題名 | 鹽分對欖李苗木生長之影響=Effects of Salinity on the Growth of the Mangrove Lumnitzera racemosa Seedlings |
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作者 | 范貴珠; 許博行; 張峻德; | 書刊名 | 中華林學季刊 |
卷期 | 32:3=126 1999.09[民88.09] |
頁次 | 頁299-312 |
分類號 | 436.11 |
關鍵詞 | 紅樹李; 欖李; 鹽度; 生長分析; Mangrove; Lumnitzera racemosa; Salinity; Growth analysis; |
語文 | 中文(Chinese) |
中文摘要 | 欖李苗木以0、0.75、1.5、3.0、4.5及6.0% NaCl溶液處理60、90及120天後, 苗木之形質生長隨著鹽分濃度的增加而降低。鹽分處理120天後顯示,以0.75% NaCl處理之苗高、地際直徑、葉片數、葉片大小、總葉面積、葉片伸展速率及各部位乾物累積量最大,表示此為適合欖李苗木生長之鹽分濃度。鹽分濃度高於1.5%以上則苗木生長受抑制,3.0%處理之苗木所有形態參數明顯下降,而4.5% NaCl為此苗木之致死濃度。高濃度鹽分會增加葉片肉質程度,尤其在鹽分處理120天時,4.5及6.0% NaCl處理有最大之肉質程度。本研究利用生長分析以瞭解整株苗木對鹽分的反應機制,結果顯示苗木之相對生長速率(RGR)及葉面積比(LAR)隨著鹽度增加而明顯降低,但淨同化作用速率(NAR)則不受鹽分影響,由此推測欖李生長量的降低主要是因RGR降低所致。鹽分濃度的增加亦使比葉面積(SLA)及葉重比(LWR)降低,顯示鹽分會導致葉部型態及碳分配的改變。 |
英文摘要 | Seedlings of the mangrove Lumnitzera racemosa were grown in various concentrations of salinity containing 0, 0.75, 1.5, 3.0, 4.5 and 6.0% NaCl for 60, 90, and 120 days. Overall the morphological parameters including seedling height, diameter at root collar, leaf numbers, leaf size, total leaf area, leaf expansion rate and dry matter accumulation of seedlings cultivated in 0.75% NaCl were the most greatly enhanced. This implied that the 0.75% NaCl was the optimum salinity for seedling growth of this species. On the other hand, seedlings exposed in 4.5 and 6.0% NaCl died off at the end of experiment, hence, the 4.5% NaCl was the concentration of lethal threshold. Succulence in leaves of sedlings were higher when grown in increasing salinity and the highest degree of succulence was obtained at 4.5 and 6.0% NaCl treatments. To understand the salt stress induced mechanisms at the whole-plant level, multiple harvests were performed and the interactions of salinity with time were examined with growth analysis. Relative growth rate (RGR) and leaf area ratio (LAR) were significantly reduced by salinity, but net assimilation rate (NAR) was unaffected. This implied that salinity induced growth reduction in L. racemosa was primarily a result of a lower RGR. Salinity also reduced the specific leaf area (SLA) and leaf weight ratio (LWR), which indicated that leaf morphology and carbon allocation were altered. |
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