高原农业2026，Vol.10Issue(4)：479-486,8.DOI:10.19707/j.cnki.jpa.2026.04.007
不同水分条件对乔松幼苗光合特性的影响
Effects of Different Water Conditions on the Photosynthetic Characteristics of Young Pinus wallichiana Seedlings
摘要
Abstract
To investigate the effects of different water conditions on the photosynthetic characteristics of young Pinus wallichiana seedlings,this study used two-year-old Pinus wallichiana seedlings as the experimental material and set up four water stress gradient treatments:the control group(CK,90%soil water holding capacity),the mild drought group(LS,70%soil water holding capacity),the moderate drought group(MS,50%soil water holding capacity),and the severe drought group(SS,30%soil water holding capacity).The changes in photosynthetic parameters of the seedlings under different water stress conditions were analyzed.The results showed that the net photosynthetic rate(Pn)of the LS group was significantly higher than that of the other treatment groups;the stomatal conductance(Gs)was the highest in the LS group and the lowest in the SS group.The intercellular CO2 concentration(Ci)of each treatment group showed a diurnal variation trend of first decreasing and then increasing,with the LS group maintaining the highest level.The daily average transpiration rate(Tr)was LS>MS>CK>SS,and the Tr of the LS group was the highest,while that of the SS group was only 27.35%of the LS group.The water use efficiency(WUE)was the best in the LS group(4.749 μmol·m2·s-1),significantly higher than that of the other treatments,followed by the MS group(4.230 μmol·m2·s-1),and the CK and SS groups were lower.The study shows that mild drought stress is beneficial to improving the photosynthetic efficiency and water use ability of Pinus wallichiana seedlings.It has laid a theoretical foundation for the promotion and application of Pinus wallichiana in mild drought areas.关键词
乔松/不同水分条件/光合特性/水分利用Key words
Pinus wallichiana/different water conditions/photosynthetic characteristics/water use分类
农业科技引用本文复制引用
单增罗布,琼达,旦增尼玛,王玉婷,谢欢欢,仁增朗加,格桑曲珍..不同水分条件对乔松幼苗光合特性的影响[J].高原农业,2026,10(4):479-486,8.基金项目
西藏自治区科技计划项目(XZ202401YD0026) （XZ202401YD0026）
乔松繁育及露天栽培技术研究项目(2021-5) （2021-5）
西藏自治区科技计划项目(XZ202501YD0019) （XZ202501YD0019）
国家林草局林草科技创新平台运行(2022132305). （2022132305）
