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Effects of the CO2 concentration and water content on the growth and nutrient of Cinnamomum camphora seedlings
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本試驗主要探討高濃度二氧化碳與缺水處理對於樟樹（Cinnamomum camphora）苗木形質生長的影響，並進一步探討苗木結構性碳水化合物、礦質養分及非結構性碳水化合物累積和分配。試驗是將苗木栽植於1 L的威特缽中，置於一般二氧化碳濃度（380 µmol mol-1）及高二氧化碳濃度（800 µmol mol-1）生長箱內，每個生長箱中皆有一半的苗木每十天供水一次，另一半則隔天供水。以十天為一收穫週期，收穫前現場量測苗高和地徑直徑等形質生長，收穫後再量測葉面積、地上部和地下部乾物重，並分析礦質養分和碳含量，以及碳水化合物。結果顯示生長在高二氧化碳濃度下的苗木，下適應的情形尚未出現，因此生長在高二氧化碳濃度下的苗木，其乾物重的累積顯著高於一般二氧化碳濃度，30天後尤其明顯。缺水逆境下乾物重的累積會被抑制，但是高二氧化碳濃度缺水處理的苗木與一般二氧化碳濃度處理非缺水逆境處理的苗木，乾物重的累積相差不大。另二氧化碳濃度升高時，會造成葉片及根部可溶性糖類濃度增加，缺水逆境則改變澱粉與可溶性糖類的分配，使得非結構性碳水化合物傾向於水解成小分子糖類。高二氧化碳濃度下生長的苗木葉片中礦質養分的累積較一般二氧化碳濃度下的苗木低，同時缺水逆境下的苗木也因為養分吸收受到干擾，導致累積量下降。
This study investigated how high [CO2] and low water supply impacted the growth and further discussed mineral nutrient, structural and non-structural carbohydrate accumulation and partition of camphor seedlings(Cinnamomum camphora). The seedlings were planted in a 1 L pot and placed in the chambers of 380 and 800 µmol mol-1 [CO2]. Half of the seedlings in the chamber were watered once every ten days, while the other seedlings were watered every other day. Seedlings were harvested every ten days. We measured the height and diameter to realize the morphological parameter before harvesting, and then measured the leaf area and dry weight of the above and bellow ground of the seedlings. In addition, carbohydrate, carbon and mineral nutrient were analyzed as well. The result suggested that seedlings growth in the elevated CO2 concentration didn't show the down-regulation during the experiment periods, thereby dry weight were significantly higher than the seedlings planted in the ambient CO2 concentration, especially the third period. Water stress would inhibit biomass accumulation. Seedlings planted in the elevated CO2 concentration with water stress and comparison of seedlings that planted in the ambient CO2 concentration without water stress showed no significantly difference in total dry weight. Elevated CO2 concentration resulted in increasing soluble sugar content in the leaves and roots. Under water stress, non-structural carbohydrate would hydrolyze into low molecular sugar and decrease the damage of the drought. Water stress intervened in mineral nutrient uptake and therefore it decreased the mineral nutrient content in the leaves.
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