农业机械学报2017，Vol.48Issue(4)：233-241,9.DOI:10.6041/j.issn.1000-1298.2017.04.030
控制灌溉水稻叶片水分利用效率影响因素分析
Influence Factors Analysis of Rice Leaf Water Use Efficiency under Controlled Irrigation
摘要
Abstract
In order to investigate the impact factors and mechanism of high water use efficiency under water-saving irrigation technology,experiment with two irrigation treatments was carried out in rice field,including flooding irrigation (FI) and non-flooding controlled irrigation (NFI).In the FI rice fields,a depth of 3 ～ 5 cm standing water was always maintained after transplantation,except during the drainage period in later tillering and yellow maturity stages.In the NFI rice fields,the pond water was kept between 5 mm and 25 mm during the first 7 ～ 8 d after transplantation at the regreening stage.At other stages,irrigation was applied only to keep the soil moist and flooding was avoided;standing water up to 5 cm depth in NFI fields was maintained for less than 5 d just to meet the requirements for the pesticide or fertilizer application.The relationships between stomatal regulation,environmental factors and leaf water use efficiency were studied,meanwhile,the regression equations of leaf water use efficiency were established,and the path analysis method was applied to analyze the impact factors.The results showed that there was a quadratic regression equation between stomatal conductance (Gs) and transpiration rate (Tr),photosynthetic rate (Pn),leaf water use efficiency (LWUE) under NFI treatment,to maintain high LWUE,optimal stomatal conductance was 0.54 mol/(m2 · s),and the peak value was appeared earlier than that of FI treatment.There was also a quadratic regression equation between LWUE and environmental factors,including air temperature (Ta),leaf temperature (Tl),leaf-air temperature difference (AT),air CO2 concentration (Ca) and photosynthesis available radiation (Par).While LWUE was negatively related to intercellular CO2 concentration (Ci) and positively correlated with soil moisture (θ),the relationship between LWUE and relative humidity (Rh) was exponential.The temperature factors composed of Ta,Tl and AT contributed 39.19％ to LWUE,while the CO2 concentration factors composed of Ca and Ci contributed 17.81％,the vapor factor composed of Rh and θ contributed 17.81％,and the light factor composed of Par contributed 9.01％.Furthermore,the regression equation of LWUE was established,and the path analysis method was applied to analyze the impact factors,as for the NFI treatment,it was found that Par,Gs and θ may not be the main influence factors,the sensitive indicators affecting the LWUE were Ci,Tl and Rh.关键词
水稻/控制灌溉/叶片水分利用效率/影响因素/通径分析Key words
rice/controlled irrigation/leaf water use efficiency/influence factors/path analysis分类
农业科技引用本文复制引用
庞桂斌,徐征和,杨士红,徐俊增..控制灌溉水稻叶片水分利用效率影响因素分析[J].农业机械学报,2017,48(4):233-241,9.基金项目
国家自然科学基金项目(51179049、51509105)和山东省自然科学基金项目(ZR2014EEQ020) （51179049、51509105）
