快速反映植物水分状况的叶片紧张度模型  

Quick Reflection of Moisture Condition for Plant Using Leaf Tensity

作　　者：吴沿友[1] 张明明[1] 邢德科[1] 周贵尧[1] 

机构地区：[1]江苏大学现代农业装备与技术教育部重点实验室,镇江212013

出　　处：《农业机械学报》2015年第3期310-314,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(31070365);国家自然科学基金青年基金资助项目(31301243);江苏大学引进人才科研启动基金资助项目(13JDG030);江苏省高校优势学科资助项目(苏政办[2014]37号)

摘　　要：植物的水分状况会影响其光合作用等生理作用,叶片紧张度可以反映植物的水分状况。植物叶片组织水势及生理电容与细胞液浓度有偶联关系,植物叶片生理电容与叶片有效厚度、极板接触的叶片有效面积有关,定义叶片紧张度为极板接触的叶片有效面积与叶片有效厚度的比值,依据这种偶联关系推导出叶片紧张度与组织水势、生理电容的关系模型。以野外自然生长的构树、桑树叶片为实验材料,测定不同时刻叶片的生理电容和组织水势,利用这种关系模型计算出两种植物各测定时刻的叶片紧张度。结果显示,不同植物不同时刻的叶片紧张度是不同的;构树叶片紧张度、生理电容、组织水势日变化与光合指标日变化的相关系数分别为0.933、0.926、0.631,桑树叶片紧张度、生理电容、组织水势日变化与光合指标日变化的相关系数分别为0.843、0.820、0.217,由此可以看出叶片紧张度比生理电容、组织水势能更好地反映植物水分状况的变化情况。The physiological role of plant, such as photosynthesis, is affected by water status. Water status of the plant can be reflected by leaf tensity. Foliar water potential and physiological capacitance has a coupling relationship with the cell sap concentration. Foliar physiological capacitance is associated with the effective thickness and area of leaf. The ratio of the area of leaf and effective thickness was defined as leaf tensity. According to this coupling relationship, the relational model of leaf tensity and water potential, physiological capacitance was derived. Leaves of Broussonetia papyrifera and Mulberry alba which grow in nature were selected as experiment materials. Physiological capacitance and water potential at different time were determined. Leaf tensity at different time was calculated by using the relational model. The result showed that there were differences between leaf tensity of Broussonetia papyrifera and Mulberry alba at different determination time. The correlation coefficient between photosynthetic parameters and leaf tensity of Broussonetia papyrifera was 0. 933, physiological capacitance was 0. 926 and water potential was 0.63l, respectively. The correlation coefficient between photosynthetic indexes and leaf tensity of Mulberry alba was 0. 843, physiological capacitance was 0. 820 and water potential was 0. 217, respectively. It demonstrated that the leaf tensity could better reflect the changes in water status of plant than physiological capacitance or water potential.

关 键 词：叶片紧张度 生理电容 组织水势 

分 类 号：S24[农业科学—农业电气化与自动化] Q945[农业科学—农业工程]