不同剂量保水剂对袋式复合沙培辣椒光合特性日变化规律的影响

【目的】 研究保水剂对袋式复合沙培辣椒光合特性的影响,利用主成分分析综合评价不同剂量保水剂对辣椒光合各项指标的影响。【方法】 以瑞霸五号为试材,以保水剂施用量为变量,通过穴施保水剂,测定盛果期时叶片的净光合速率、气孔导度、胞间CO₂浓度、蒸腾速率以及水分利用效率,研究不同剂量保水剂对袋式复合沙培辣椒光合特性日变化规律的影响。【结果】 在栽培基质中加入保水剂后,有助于提高辣椒叶片的光合特性,各处理的净光合速率均为“双峰”曲线,并在14:00时出现“午休”现象,除胞间CO₂浓度以外,各项指标随着保水剂剂量的增加呈现增加的趋势。B₅处理(3 g/穴)的光合特性表现最好,光合速率为12.91 μmol/(m²·s),气孔导度为0.22 μmol/(m²·s),胞间CO₂为163.82 μmol/mol,蒸腾速率为5.37 mmol/(m²·s),水分利用效率为3.28 μmol/(m²·s)。【结论】 在栽培基质中施加3 g/穴保水剂对辣椒的各项光合指标表现最好。

Effects of Different Dosage of Water-Retaining Agents on the Diurnal Variation of Photosynthesis of Bag-type Composite Sape Pepper

【Objective】 To explore the effects of water-retaining agents on photosynthetic characteristics of bag-type compound sape peppers, and to evaluate the effects of different doses of water-retaining agents on photosynthetic indexes of peppers by using principal component analysis. 【Method】 In this test, Ruiba No. 5 was used as the test material, and the amount of the water-retaining agent was used as a variable. The leaf photosynthetic rate, stomatal conductance, intercellular CO₂ concentration, transpiration rate and water use efficiency were used to study the effects of different dosages of water-retaining agents on the diurnal variation of photosynthetic characteristics of bag-type compound sape peppers. 【Results】 The results showed that the addition of a water-retaining agent to the cultivation substrate helped to improve the photosynthetic characteristics of pepper leaves. The net photosynthetic rate of each treatment was a "double-peak" curve, and a "lunch break" phenomenon occurred at 14:00 In addition to the intercellular CO₂ concentration, various indicators showed an increasing trend with the increase in the amount of water retaining agent. According to the principal component analysis, the photosynthetic characteristics of the B₅ treatment (3 g/hole) the best. The photosynthetic rate 12.91 μmol/(m² · s), and the stomatal conductance 0.22 μmol/(m² · s). Intercellular CO₂ was 163.82 μmol/mol, transpiration rate was 5.37 mmol/(m² · s), and water use efficiency was 3.28 μmol/(m² · s). 【Conclusion】 In summary, the application of 3 g/hole water-retaining agent in the cultivation medium performed the best photosynthetic indexes of pepper.