中国农学通报2026，Vol.42Issue(13)：66-72,7.
降冠对核桃'云新高原'光合性能的效应
Effects of Crown-decreasing on Photosynthetic Performance of Juglans regia'Yunxingaoyuan'
摘要
Abstract
This research aimed to clarify the effects of crown-decreasing on photosynthetic performance of Juglans regia'Yunxingaoyuan',providing a basis for the industrial popularization and application of the crown-decreasing technology in J.regia cultivation.Crown-decreasing was performed on the J.regia'Yunxingaoyuan'trees entering full fruiting period,the photosynthetic pigment contents of the leaves were determined by using spectrophotometry,the photosynthetic and chlorophyll fluorescence parameters of the leaves were measured by using portable photosynthetic apparatus,and the comprehensive ranking of the leaf photosynthetic performance was evaluated by using membership function.The results indicated that the area,chlorophyll a content([Chl a]),chlorophyll b content([Chl b]),total chlorophyll content{[Chl(a+b)]},carotenoid content([Car])and the initial fluorescence(F0)of the leaves of the 4.0 m crown height plants were the highest,i.e.,about(77.4378±10.7445)cm2,(2.3780±0.1483)mg/(g·FW),(0.9775±0.1091)mg/(g·FW),(3.3565±0.2376)mg/(g·FW),(0.6391±0.0426)mg/(g·FW)and 110.0982±6.5923,respectively,the[Chl a]/[Chl b],maximum fluorescence yield(Fm)and the maximal photochemical efficiency of PSⅡ(Fv/Fm)of the leaves of the check(CK)plants with 8.0-9.0 m crown height were the highest,i.e.,approximately 2.8662±0.1448,917.8035±10.2468 and 0.8928±0.0032,respectively,whereas the[Chl(a+b)]/[Car],net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO2 concentration(Ci)and transpiration rate(Tr)of the leaves of the 3.6 m crown height plants were the highest,i.e.,roughly 5.5542±0.6019,(14.3004±1.8561)μmol/(m2·s),(0.081±0.0064)mol/(m2·s),(719.4092±153.8605)μmol/mol and(2.3070±0.1348)mmol/(m2·s),respectively.The differences of the area,[Chl a],[Chl b],[Car],F0 and Fv/Fm among the plants with different crown heights all reached significant levels,the differences of the[Chl(a+b)],Pn,Gs,Tr and Fm all reached extremely significant levels,but those of the[Chl a]/[Chl b],[Chl(a+b)]/[Car]and Ci did not reach any significant levels.In brief,the comprehensive ranking of the photosynthetic performances of the leaves was as:3.6 m crown height＞4.0 m crown height＞4.4 m crown height＞CK.Thus,the 3 crown-decreasing treatments can all improve the photosynthetic performance of J.regia'Yunxingaoyuan'leaves,when the crown height is decreased to 3.6 m,the leaf photosynthetic performance is the best.关键词
核桃'云新高原'/盛果期/降冠/光合色素含量/光合参数/叶绿素荧光参数/综合等级Key words
Juglans regia'Yunxingaoyuan'/full fruiting period/crown-decreasing/photosynthetic pigment contents/photosynthetic parameters/chlorophyll fluorescence parameters/comprehensive ranking分类
农业科技引用本文复制引用
吴红全,赵昶灵,续路林,陈利红,保俊春,皇甫红星,田迎春,常家云,赵鹏宇,李仕江..降冠对核桃'云新高原'光合性能的效应[J].中国农学通报,2026,42(13):66-72,7.基金项目
云南省陆良县营林管理站资助项目"核桃'云新高原'降冠提质增效的机理"(LYHZ2024-1) （LYHZ2024-1）
云南省科学技术协会、云南农业大学和西南林业大学联合资助项目"2025年度楚雄市农民院士科技服务站"(A3012025014) （A3012025014）
云南省科技厅资助项目"2025年云南省科技特派员"(No.321). （No.321）
