西南湿润区微灌猕猴桃果园不同尺度光利用效率与驱动因子  

Variations and driving factors of multi-scale light use efficiency in micro-irrigated kiwifruit orchards in Southwest China

作　　者：杨斌环 崔宁博[1] 何清燕 姜守政 郑顺生 黄耀威 YANG Binhuan;CUI Ningbo;HE Qingyan;JIANG Shouzheng;ZHENG Shunsheng;HUANG Yaowei(State Key Laboratory of Hydraulics and Mountain River Engineering/College of Water Resource and Hydropower,Sichuan University,Chengdu,Sichuan 610065,China;Sichuan Reseach&Design Institute of Agricultural Machinery,Chengdu,Sichuan 610066,China)

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室/水利水电学院,四川成都610065 [2]四川省农业机械研究设计院,四川成都610066

出　　处：《排灌机械工程学报》2022年第9期936-944,共9页Journal of Drainage and Irrigation Machinery Engineering

基　　金：“十三五”国家重点研发计划项目(2016YFC0400206-03);国家自然科学基金优秀青年科学基金资助项目(51922072);国家自然科学基金资助项目(51779161,51009101);中央高校基本科研业务费专项(2019CDLZ-10,2020CDDZ-19)。

摘　　要：为揭示中国西南湿润区猕猴桃果园不同尺度光利用效率(LUE)的变化规律,探明生理、环境和植被因子对猕猴桃果园不同尺度LUE的影响机理,以四川省蒲江县猕猴桃果园为研究对象,于2018—2020年采用涡度相关系统(EC)开展了连续3 a的水热碳通量综合观测,研究了猕猴桃叶片尺度瞬时光利用效率(LUE_(i))、冠层尺度光利用效率(cLUE)和生态系统尺度光利用效率(eLUE)的变化规律,并采用通径分析方法量化了生理因子[净光合速率(P_(n))、气孔导度(g_(s))]、气象因子[总辐射(R_(g))、光合有效辐射(PAR)、空气温度(T_(a))、H_(2)O浓度(C_(H_(2)O))、CO_(2)浓度(C_(CO_(2)))、2 m处风速(U_(2))、水汽压差(VPD)]、土壤水分因子(土壤体积含水率(SWC)和植被因子[叶面积指数(LAI)]对猕猴桃果园不同尺度LUE的总影响.结果表明:猕猴桃LUE_(i)随PAR增大而降低,变化范围为0.006~0.026μmol/μmol;猕猴桃cLUE和eLUE月平均日内变化均呈先减后增的“U”形,月累积cLUE与eLUE变化幅度分别为0.77~2.67和0.58~1.63 g/MJ,两者变化趋势基本一致且未呈现明显的季节性变化.叶片尺度LUE_(i)主要受气象因子(PAR)和生理因子(P_(n))影响并具有统计学意义,PAR和P_(n)对LUE_(i)分别具有显著的直接影响(量化值为-0.99)和间接影响(量化值为-0.81);冠层尺度cLUE和生态系统尺度eLUE均受气象因子(R_(g),T_(a)和VPD)以及植被因子(LAI)影响并具有统计学意义,其中R_(g)和VPD主要通过影响光吸收过程以影响eLUE和cLUE,而T_(a)和LAI则通过碳同化过程以影响eLUE和cLUE.To reveal the changing trends of light use efficiency of kiwifruit orchards at different scales in the humid regions of Southwest China and to explore the influence mechanism of physiological,environmental and vegetation factors on light use efficiency of kiwifruit orchards at different scales.The vorticity correlation system was used to conduct comprehensive observations of water,heat and carbon flux for three consecutive years from 2018 to 2020 in the kiwifruit orchards in Pujiang County,Sichuan Province.The regulations of light use efficiency at different scales in kiwifruit orchards were explored.The path analysis method was used to quantify the total effect of physiological factors,climatic factors,soil moisture factors,and vegetation factors on the light use efficiency of kiwifruit orchards at different scales.The results show that kiwifruit′s leaf instantaneous light use efficiency(LUE_(i))decreases with increasing photosynthetically active radiation(PAR),ranging from 0.006 to 0.026μmol/μmol.The monthly average daily changes of canopy light use efficiency(cLUE)and ecosystem light use efficiency(eLUE)are U-shaped.The monthly cumulative cLUE and eLUE range between 0.77-2.67 and 0.58-1.63 g/MJ,respectively,and their trends are the same with no obvious seasonal change.LUE_(i) is mainly affected by meteorological factors(PAR)and physiological factors(P_(n))significantly,and PAR and P_(n) have significant direct(-0.99)and indirect(-0.81)effects on LUE_(i),respectively;cLUE and eLUE are significantly affect by meteorological factors(R_(g),T_(a) and VPD)and vegetation factor(LAI).R_(g) and VPD mainly affect eLUE and cLUE by affecting the light absorption process,while T_(a) and LAI affect eLUE and cLUE through carbon assimilation.

关 键 词：猕猴桃 光利用效率 叶片尺度 冠层尺度 生态系统尺度 

分 类 号：S271[农业科学—农业水土工程]