基于结构方程模型的控水稻“需水量-光合量-产量”关系研究  

Relationships of 'water requirementphotosynthesisproduction' for paddy rice using structural equation modeling

作　　者：缪子梅[1,2] 俞双恩[1,2] 卢斌[2,3] 丁继辉[1,2] 于智恒[1,2] 

机构地区：[1]河海大学南方地区高效灌排与农业水土环境教育部重点实验室,南京210098 [2]河海大学水利水电学院,南京210098 [3]南京水利科学研究院,南京210029

出　　处：《农业工程学报》2013年第6期91-98,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：江苏省水利科技项目(编号2011037);国家自然基金重点项目(50839002);江苏高校优势学科建设工程资助项目(水利工程);河海大学中央高校基本科研业务费资助项目(B11020122)

摘　　要：水稻产量的形成是源库互作的过程,稻田水位的变化对水稻的源库关系有重要影响。该文使用2009、2010年,2年水位调控试验数据,通过计算水位调控水稻全生育期需水量和冠层总光合量,选取水稻群体质量因子(最大LAI、根冠比、株高、茎质量)和产量构成因子(有效穗数、每穗粒数、千粒重、结实率),利用结构方程模型综合分析了水位调控水稻需水量、光合量与群体质量及产量构成之间的关系,结果表明:水位调控水稻总需水量对各因子总效果大小(绝对值)的前三位依次为:千粒重(0.717)、有效穗数(0.650)、每穗粒数(0.459)。冠层总光合量对各因子总效果大小(绝对值)的前三位依次为:茎重(0.613)、最大LAI(0.437)、株高(0.437)。说明总需水量对产量的形成起重要作用,而冠层光合侧重于影响水稻群体发育状况。水位调控水稻"源-库"间相关系数为0.44,呈中度正相关关系。总需水量与冠层总光合量对产量的直接和间接效果值均为正值,总需水量对产量的总效果值(0.552)大于冠层总光合量(0.201),且这种影响主要来自间接作用(0.492),即对产量构成因子的作用。The yield formation of rice is affect by the relation between source and sink, and the variation of water level is important to relationship between source and sink. Under the water management of paddy rice, yield and population quality can be controlled effectively, which is important to the relationship between moisture and yield studies. Structural equation modeling （SEM） is a method of multivariate statistical analysis. Through structuring generalization of the theoretical models and path diagrams, causal relationships and effect value among the multivariable can be achieved. Based on source-sink theory of rice, this study analyzed the relationships of ＂water requirement-photosynthesis-population quality-production＂ for paddy rice under water level control using structural equation modeling method. Tests were implemented in the experimental station of Jiangning campus of Hohai University （Efficient Irrigation and Drainage and Environment of Agriculture Water and Soil of South Area Key Laboratory of The Ministry of Education） from May to October in 2009 and 2010. Those tests were carried out in fixed cubic lysimeters （28 with closed bottom and 2 without bottom） with specifications for the length × width × depth = 2.5m×2m×2m, and processing scheme of drought and waterlogging in different growth stages of rice was designed. Dynamic variation rule of water level in paddy fields and rice growth and physiological indexes were observed, rice water requirement during whole growth stages and total amount of canopy photosynthesis under water level control were calculated. Then, we chose some population quality indexes （maximum LAI, root-shoot ratio, plant height, stem weight） and yield components indexes （effective panicles, grains per panicle, 1000-grain weight, seed setting rate） as observation variable, and analyzed the relationships among water requirement, photosynthesis, population quality and yield components of rice under water level control using structural equation modeling method.

关 键 词：灌溉 光合 生理 水稻 产量 源库理论 结构方程模型 

分 类 号：S152[农业科学—土壤学]