基于光合特性的毛竹实生苗土壤水分有效性及生产力分级  

Classification of soil water availability and productivity of Moso bamboo(Phyllostachys edulis)seedlings based on photosynthetic characteristics

作　　者：景雄 范少辉 蔡春菊 刘广路 王树梅 罗慧莹 刘淼 JING Xiong;FAN Shao-hui;CAI Chun-ju;LIU Guang-lu;WANG Shu-mei;LUO Hui-ying;LIU Miao(International Centre for Bamboo and Rattan,Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and Technology,Beijing 100102,China)

机构地区：[1]国际竹藤中心,国家林业和草原局/北京市共建竹藤科学与技术重点实验室,北京100102

出　　处：《生态学杂志》2021年第10期3088-3097,共10页Chinese Journal of Ecology

基　　金：国际竹藤中心基本科研业务费专项资金项目(1632020009)资助。

摘　　要：以毛竹(Phyllostachys edulis)3年生实生苗为材料,通过盆栽控制试验设置连续多级土壤含水量,在土壤相对含水量(RWC)与毛竹实生苗光合生理指标间建立回归模型,运用其光合特性作为评判依据,对毛竹实生苗培育管理过程中的土壤水分有效性及生产力进行分级与评价。结果表明:当RWC在77.01%时毛竹实生苗最大净光合速率(Pmax)达到峰值(9.56μmol·m^(-2)·s^(-1));光合有效辐射强度(PAR)在1000μmol·m^(-2)·s^(-1)时,Pn补偿水分点(RWCP n=0)为17.41%,净光合速率最大值(Pn-max=9.36μmol·m^(-2)·s^(-1))出现在RWCP n-max=78.19%;最大水分利用效率(WUEmax=4.55 mmol·mol^(-1))对应的RWC为64.28%,水分利用效率均值(WUEave=2.62 mmol·mol^(-1))分别出现在RWC=34.25%、94.32%,水分利用效率(WUE)正负转折点在RWC=18.17%处;以不同土壤水分下的毛竹净光合速率(Pn)及水分利用效率(WUE)值作为"产"、"效"分级评判依据,3年生毛竹实生苗高产高效水RWC为44.69%~94.32%,中产高效水RWC为34.25%~44.69%,低产低效水RWC为17.41%~29.11%,RWC>94.32%为高产中效水,RWC<17.41%为无产无效水。本研究提出了毛竹实生苗培育的土壤水分利用参数,为毛竹育苗过程中的水分高效管理提供参考。A pot experiment was conducted with a multi-level soil water content gradient,to examine the relationship between soil relative water content(RWC)and photosynthetic physiological indices of three-year-old Moso bamboo(Phyllostachys edulis)seedlings.With photosynthetic physiological parameters as judging criteria,soil water availability and productivity in the course of cultivation and management of P.edulis seedlings were graded and evaluated.The results showed that maximum net photosynthetic rate(Pmax)of P.edulis peaked(9.56μmol·m^(-2)·s^(-1))at the RWC of 77.01%.At the photosynthetically active radiation intensity(PAR)of 1000μmol·m^(-2)·s^(-1),the Pncompensation water point(RWCP n=0)was 17.41%,and the maximum net photosynthetic rate(Pn-max=9.36μmol·m^(-2)·s^(-1))occurred at RWCP n-max=78.19%.The maximum water use efficiency(WUEmax=4.55 mmol·mol^(-1))corresponded to a RWC of64.28%.The average water use efficiency(WUEave=2.62 mmol·mol^(-1))appeared at RWC=34.25%and 94.32%,respectively.The positive and negative turning point of water use efficiency(WUE)was at RWC=18.17%.Pnand WUE values of P.edulis under different soil moisture were used as the basis to evaluate"yield"and"efficiency".The results showed that,when the RWC ranged from 44.69%to 94.32%,the productivity level of three-year-old seedlings of P.edulis was high-yield and high-efficiency.The productivity level was intermediate-yield and highefficiency when the RWC was 34.25%-44.69%.Meanwhile,RWC=17.41%-29.11%meant low-yield and low-efficiency productivity level.RWC>94.32%meant that the productivity level was high-yield and intermediate-efficiency,while RWC<17.41%made the production level nonproductive and ineffective.This study puts forward the soil water utilization parameters for the cultivation of P.edulis seedlings,which provides a reference for efficient water management in the cultivation of P.edulis seedlings.

关 键 词：毛竹 土壤相对含水量 光合特性 分级与评价 

分 类 号：S795.7[农业科学—林木遗传育种]