土壤水分和施肥对木姜叶柯生长与光合特性的影响OA

This study investigated the effects of soil moisture and fertilization on the growth and photosynthetic characteristics of potted Litho-carpus litseifolius(Hance)Chun,aiming to provide theoretical guidance for its cultivation and field management.Five levels of soil moisture were tested:W1(3.3%),W2(3.7%),W3(4.6%),W4(5.7%),and W5(8.0%).Similarly,five fertilization treatments were ap-plied:F1(0 g/pot),F2(40 g/pot),F3(80 g/pot),F4(120 g/pot),and F5(160 g/pot).Growth parameters,including plant height,number of branches,branch length,and stem diameter,were measured.Photosynthetic characteristics were assessed using a Li-6400 portable photosynthesis meter,along with comparisons of chlorophyll content and morphological traits of the plants and leaves.The results indicated that at a soil water content of 8.0%(W5),plant height increased most significantly(15.77 cm),and chlorophyll content(2.4 mg/g)and net photosynthetic rate improved markedly.In contrast,when soil moisture fell below 4.6%(W3),growth rates declined,and the maximum effi-ciency of photosystem II(Fv/Fm)diminished.In terms of fertilization,the application of 40 g/pot(F2)of organic fertilizer significantly en-hanced plant height(23.27 cm)and chlorophyll synthesis(1.48 mg/g);however,a negative effect was observed when the application excee-ded 80 g/pot(F4).This research demonstrated that the response of L.litseifolius to water and fertilizer followed an"inverted U-shaped"curve,with optimal cultivation conditions identified as soil moisture levels between 5.6%and 8%and organic fertilizer application rates of 40 to 80 g/pot.These findings provide a theoretical foundation for the efficient cultivation and management of L.litseifolius.