Effects of Water-Fertilizer Coupling on Growth Characteristics and Water Use Efficiency of Camellia petelotii Seedlings  

作　　者：Liangyu Luo Ru Li Daocheng Ma Yijin Wang Linghui Wang 

机构地区：[1]Guangxi Key Laboratory of Forest Ecology and Conservation,Key Laboratory of National Forestry and Grassland Administration on Cultivation of Fast-Growing Timber in Central South China,College of Forestry,Guangxi University,Nanning,530004,China [2]School of Architecture Engineering,Guangxi University of Nationalities,Nanning,530006,China

出　　处：《Phyton-International Journal of Experimental Botany》2024年第11期2927-2947,共21页国际实验植物学杂志（英文）

基　　金：Financial assistance project:Guangxi Forestry Science and Technology Project(Guilin kezi[2012]No.25).

摘　　要：Camellia petelotii(Merr.)Sealy is an endangered Chinese native species that originates from Guangxi Zhuang Autonomous Region,China.Previous research demonstrated that proper water and fertilizer treatments could improve the growth and quality of Camellia species.This study uses a three-factor,five-level quadratic rotational combination experimental design to investigate the impact of water-fertilizer coupling on plant growth character-istics and the most suitable treatment for 24-month-old grafted C.petelotii seedlings.The experimental design includes irrigation levels[30%,40%,55%,70%,80%offield capacity(FC)],nitrogen application(0,2.17,5.43,8.70,10.87 g·plant^(-1)),and phosphorus application(0,0.96,2.40,3.85,4.81 g·plant^(-1)).The results indicated that:(1)Water-nitrogen and water-phosphorus interactions significantly affected ground diameter,chlorophyll content and specific leaf weight(SLW),while water-nitrogen interactions significantly affected plant height and photo-synthesis;(2)Application of nitrogen(8.70 g·plant^(-1))and phosphorus(3.85 g·plant^(-1))fertilizers under appropri-ate irrigation conditions(40%FC and 70%FC)improved growth.Applying fertilizers containing either nitrogen(10.87 g·plant^(-1))or phosphorus(4.81 g·plant^(-1))under adequate irrigation(55%FC)increased the Chl content.However,high nitrogen levels(10.87 g·plant^(-1))reduced photosynthesis.Conversely,it was enhanced under appropriate phosphorus(4.81 g·plant^(-1))when the irrigation level was 55%FC,indicating the sensitivity of C.pete-lotii seedlings to nitrogen fertilizer.(3)Under specific conditions of 40%FC or 70%FC irrigation and 8.70 g·plant^(-1) or 2.17 g·plant^(-1) nitrogen fertilizer application,3.85 g·plant^(-1) phosphorus addition boosted the SLW whereas,0.96 g·plant^(-1) phosphorus addition inhibited it.Under W=55%FC,deficiencies in either nitrogen(N=0 g·plant^(-1))or phosphorus(P=0 g·plant^(-1))significantly decreased leaf growth,affecting SLW.In summary,C.petelotii was more sensitive to nitrogen fertilize

关 键 词：Camellia petelotii growth characteristics photosynthesis water-fertilizer coupling water use efficiency 

分 类 号：Q94[生物学—植物学]