毛白杨叶片膨压变化规律及其对环境因子的响应  

Patterns of variations in leaf turgor pressure and responses to environmental factors in Populus tomentosa

作　　者：李豆豆 席本野[1] 王斐 贾素苹 赵洪林 贺曰林 刘洋[1] 贾黎明[1] LI Dou-Dou;XI Ben-Ye;WANG Fei;JIA Su-Ping;ZHAO Hong-Lin;HE Yue-Lin;LIU Yang;JIA Li-Ming(Ministry of Education Key Laboratory of Silviculture and Conservation,Beijing Forestry University,Beijing 100083,China;Liaocheng Forestry Bureau,Liaocheng,Shandong 252002,China;Forestry Workstation of Daxing District in Beijing,Beijing 102600,China;Forestry Protection Station of Daxing District in Beijing,Beijing 102600,China)

机构地区：[1]北京林业大学森林培育省部共建重点实验室,北京100083 [2]山东省聊城市林业局,山东聊城252002 [3]北京市大兴区林业工作站,北京102600 [4]北京市大兴区林业保护站,北京102600

出　　处：《植物生态学报》2018年第7期741-751,共11页Chinese Journal of Plant Ecology

基　　金："十二五"国家科技支撑计划(2015BAD09B02);国家自然科学基金项目(31400532和31670625);国家重点研发计划课题(2016YFD0600403)~~

摘　　要：明确毛白杨叶片膨压变化规律及其对环境因子的响应,可以为以叶片膨压作为水分亏缺指标指导灌溉提供理论依据。该研究以滴灌条件下的二年生毛白杨(Populus tomentosa)人工林为研究对象,对充分灌溉(FI)和控水灌溉(CK)的叶片磁力探针压力输出值(P_p)进行了连续监测,并同步监测了土壤温度(T_s)、土壤水势(Ψ_s)、液流速率(V_(SF))和气象因子,探讨了不同水分处理下毛白杨叶片膨压变化规律及其与环境因子的关系。结果表明:1)不同天气条件下的P_p均呈明显的"昼高夜低"变化规律,且晴天的峰值宽度最大;2)标准化相对叶片膨压((35)P_p)与V_(SF)在不同天气条件下均呈正相关关系,都可用二项式函数描述,决定系数(R^2)从大到小依次是:晴天(R^2=0.87)>阴天(R^2=0.72)>雨天(R^2=0.31);3)影响P_p变化的环境因子主要是光合有效辐射(PAR)、空气温度(T_a)、空气相对湿度(RH)以及饱和水汽压差(VPD),其中PAR与P_p协同变化最一致;4)(35)P_p对不同环境因子均存在时滞效应,且不同水分处理的时滞圈大小不同;5)不同水分处理的P_p曲线形状有明显差异。综上所述,毛白杨叶片膨压变化规律与环境因子关系密切,且与晴天液流速率存在高度的协同变化,有作为水分亏缺诊断指标的潜力。Aims In this study, the patterns of variations in leaf turgor pressure and responses to environmental factors were investigated in Populus tomentosa, in order to provide a theoretical basis for guiding irrigation using leaf turgor pressure as a water stress indicator. Methods The study was conducted in a two-year-old Populus tomentosa plantation under surface drip irrigation. Leaf patch clamp pressure（Pp） was continuously monitored in treatments of full irrigation（FI） and control（CK）. Soil temperature（Ts）, soil water potential（Ψs）, sap flow velocity（V（SF）） and meteorological factors were monitored simultaneously. The patterns of variations in leaf turgor pressure and relationships between Pp and environmental factors of P. tomentosa under different water treatments were analyzed. Important findings The Pp values exhibited a clear pattern of ＂daytime high and nighttime low＂ with varying weather conditions, and the width of peak signals in Pp was greatest in sunny days. The positive relationships between normalized leaf patch pressure（（35）Pp） and V（SF） fitted a polynomial function under different weather conditions, with R^2 values ranked in the order of sunny days（0.87） cloudy days（0.72） rainy days（0.31）. Photosynthetically active radiation（PAR）, air temperature（Ta）, relative air humidity（RH）, and vapor pressure deficiency（VPD） were predominant environmental factors affecting Pp, especially PAR. Hysteresis was found between（35）Pp and different environmental factors, and the size of the hysteresis loop differed between the two irrigation treatments. There were significant differences in the shapes of Pp curves between the irrigation treatments. In conclusion, the variations of leaf turgor pressure were closely related to environmental factors in P. tomentosa, and there was a high degree of synergistic change with the sap flow on sunny days. Therefore, leaf turgor pressure can potentially serve as a diagnostic indicator of water deficit.

关 键 词：叶片膨压 ZIM-探针 液流速率 水分胁迫 毛白杨 

分 类 号：S792.117[农业科学—林木遗传育种]