CAJ | 학술논문

[目的]明确不同栽植密度库尔勒香梨园光合特性，为生产上改善香梨果实产量与品质提供依据。[方法]采用 Li-6400XT型便携式光合作用测定系统对6个不同栽植密度库尔勒香梨园的叶片净光合速率、光响应曲线及CO2响应曲线进行测定。[结果]6个不同栽植密度库尔勒香梨园的光合参数均存在显著差异，4.0 m×6.0 m的光合速率最高。光响应中，4.0 m×6.0 m在光照强度达到1800μmol/(m2·s)时，净光合速率达到最大值19.326μmol/(m2·s)，表观量子效率最大；6.0 m×7.0 m有较低的光补偿点及较高的光饱和点。4.0 m×6.0 m的羧化效率及表观暗呼吸速率最高，6.0 m×7.0 m有较低的CO2补偿点，3.0 m×5.0 m CO2饱和点高。[结论]6个不同栽植密度香梨园中，4.0 m×6.0 m的净光合速率最高，对弱光的利用能力较强，对低 CO2浓度利用率较高，即此密度下库尔勒香梨光合效率最高。
[목적]명학불동재식밀도고이륵향리완광합특성，위생산상개선향리과실산량여품질제공의거。[방법]채용 Li-6400XT형편휴식광합작용측정계통대6개불동재식밀도고이륵향리완적협편정광합속솔、광향응곡선급CO2향응곡선진행측정。[결과]6개불동재식밀도고이륵향리완적광합삼수균존재현저차이，4.0 m×6.0 m적광합속솔최고。광향응중，4.0 m×6.0 m재광조강도체도1800μmol/(m2·s)시，정광합속솔체도최대치19.326μmol/(m2·s)，표관양자효솔최대；6.0 m×7.0 m유교저적광보상점급교고적광포화점。4.0 m×6.0 m적최화효솔급표관암호흡속솔최고，6.0 m×7.0 m유교저적CO2보상점，3.0 m×5.0 m CO2포화점고。[결론]6개불동재식밀도향리완중，4.0 m×6.0 m적정광합속솔최고，대약광적이용능력교강，대저 CO2농도이용솔교고，즉차밀도하고이륵향리광합효솔최고。
Objective] The aim of this study was to explore the differences in photo-synthetic characteristics of Korla fragrant pear among different planting densities, providing a basis for the improvement of fruit yield and quality of Korla fragrant pear in production. [Method] The net photosynthetic rates, photoresponse curves and CO2 response curves of Korla fragrant pear under six different planting densi-ties were determined using Li-6400XT portable photosynthesis system. [Result] There were significant differences in photosynthetic parameters of Korla fragrant pear among six different planting densities. The net photosynthetic rate of Korla fragrant pear was highest under the planting density of 4.0 m × 6.0 m. At the planting density of 4.0 m×6.0 m, when the light intensity reached 1 800 μmol/(m2·s), the net photosyn-thetic rate of Korla fragrant pear reached the peak [19.326 μmol/(m2·s)], and the apparent quantum yield, carboxylation efficiency and dark respiration rate al reached the maximum values; at the planting density of 6.0 m ×7.0 m, Korla fragrant pear showed lower light compensation point and CO2 compensation point, but higher light saturation point. At the planting density of 3.0 m ×5.0 m, Korla fragrant pear had higher light saturation point. [Conclusion] Among the six different planting densities, Korla fragrant pear with planting density of 4.0 m ×6.0 m showed the highest net photosynthetic rate. It suggested that Korla fragrant pear, at the planting density of 4.0 m ×6.0 m, had stronger utilization capacity for low light and low-concentration CO2. Therefore, the Korla fragrant pear with the planting density of 4.0 m ×6.0 m has the highest photosynthesis efficiency, and the planting density of 4.0 m ×6.0 m is the most ideal planting density for Korla fragrant pear.