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題 名 | Responses of Photosynthetic Physiology and Biomass Accumulation of Sweet Kernel Apricot (Prunus armeniaca × sibirica) Seedling to Soil Drought Stress in the Ancient Course of the Middle Yellow River=黃河古道中游乾旱逆境對甜仁杏(Prunus armeniaca × sibirica)光合生理及生物量積累影響 |
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作 者 | 徐夢莎; 趙罕; 周曉星; 烏雲塔娜; 李芳東; 朱高浦; | 書刊名 | 臺灣林業科學 |
卷 期 | 31:4 2016.12[民105.12] |
頁 次 | 頁271-284 |
分類號 | 435.321 |
關鍵詞 | 沙地; 土壤含水量; 光合作用; 葉綠素螢光; 幹物質積累; sandy soil; water content; photosynthesis; chlorophyll fluorescence; dry matter accumulation; |
語 文 | 英文(English) |
中文摘要 | 甜仁杏是中國特色的、"三北"地區適生的生態和木本油料樹種,對確保林業生態工程建設和國家糧油安全具有重要意義。但是,關於黃河古道中游土壤乾旱對苗期甜仁杏的適應性及光合生理、生物量積累的影響研究未見報道。以甜仁杏新品種"中仁1號"為研究物件,基於人工控水的方法,設置土壤品質含水量在14.0±0.5、12.0±0.5、10.0±0.5、8.0±0.5、6.0±0.5、4.0±0.5%共6個水準展開研究。研究結果表明:(1)隨著土壤水分含量的降低,"中仁1號"幼苗葉片淨光合速率(P_n)、蒸騰速率(T_r)和氣孔導度(G_s)先上升後下降,但水分利用效率(WUE)先降低後升高再降低。(2)"中仁1號"的日變化曲線為單峰型,無光合"午休"現象;在乾旱脅迫的條件下,"中仁1號"幼苗的光飽和點(LSP)逐漸減小,光補償點(LCP)逐漸增加;(3)葉綠素螢光PS II原初光能轉換效率(F_v / F_m)、最大螢光(F_m)、表觀光合電子傳遞速率(ETR)和光化學猝滅係數(qP)隨著乾旱脅迫的加劇而降低,在12.0%處理時有小幅度的上升,但最小螢光(F_0)、非光化學猝滅係數(qN)先上升後逐漸下降,但均比14.0%處理要高。(4)"中仁1號"苗期生物量積累隨乾旱脅迫加劇而受制約,而根冠比却相反,說明自體可通過提高根冠比減緩水分缺失帶來的傷害。黃河古道中游"中仁1號號"苗期生長的土壤水分適應範圍為8.0~14.0%,最適含水量為12.0%,下限為4.0%左右。 |
英文摘要 | Sweet kernel apricot (Prunus armeniaca × sibirica) is a Chinese characteristic species and an important ecological, woody grain and oil tree in the "Sanbei" area, but the biomass accumulation and photosynthetic responses of sweet kernel apricot seedlings to soil drought stress are unclear. Samples of the P. armeniaca × sibirica cultivar, Zhongren No. 1 were collected, and 6 water content gradients were arranged in the ancient course of the middle Yellow River: 14.0 (±0.5%), 12.0 (±0.5%), 10.0 (±0.5%), 8.0 (±0.5%), 6.0 (±0.5%) and 4.0% (±0.5%). Results showed that (1) the leaf's net photosynthetic rate (P_n), transpiration rate (T_r) and stomatal conductance (G_s) initially increased and then gradually decreased as the water content decreased, while there was an increasing then declining tendency in water use efficiency (WUE). (2) The diurnal variation curve was a unimodal type for Zhongren No. 1 which had no midday depression of photosynthesis. When the soil water decreased, the light saturation point (LSP) gradually declined and the light compensation point (LCP) increased. (3) When the soil water content declined, the photosynthsis system PS II original light energy conversion efficiency (F_v /F_m), the maximum fluorescence (F_m), apparent photosynthetic electron transport rate (ETR) and coefficient of photochemical quenching (qP) all decreased while there was a little increment of 12.0% in the F_0, and the coefficient of photochemical quenching (qN) initially increased and then declined. (4) As the soil water decreased, the biomass accumulation gradually dropped while the root-shoot ratio increased. The damage from water deficits was regulated through an increment in the root-shoot ratio. Our results suggested that on 8.0~14.0% soil water content would be suitable, and on optimum moisture content was 12.0%. Meanwhile, the minimum moisture content in the soil to keep P. armeniaca × sibirica cultivar Zhongren No. 1 seedlings alive would be no less than 4.0%. |
本系統中英文摘要資訊取自各篇刊載內容。