分蘖期水分调控对覆膜旱作水稻茎蘖动态影响分析  

Effect of soil moisture regulation during tillering period on shoot dynamics of rice cultivated in plastic film mulched dryland and its simulation

作　　者：徐俊增[1,2] 彭世彰[1,2] 魏征[1,2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学水利水电学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2010年第5期511-515,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家高技术研究发展计划(863计划)基金(2006AA100202);国家自然科学基金(50839002)

摘　　要：通过分蘖期不同水分调控试验,研究了分蘖期土壤水分调控对覆膜旱作水稻茎蘖动态变化规律的影响,采用套接的Logistic曲线建立了不同水分调控条件下水稻茎蘖动态模拟模型.在此基础上,分析了水稻茎蘖动态模拟模型参数的变化以及覆膜旱作水稻茎蘖的动态特性.结果表明：覆膜旱作节水灌溉水稻的茎蘖动态发生新的变化,分蘖前期茎蘖增长缓于浅湿灌溉处理,达到分蘖高峰期时间推迟,时间滞后10~20 d.土壤水分控制越低,最高茎蘖量越低,但水分最低（处理3）条件下,由于补偿效应的存在,取得了较高的茎蘖量,茎蘖高峰出现时间延迟较多.采用套接的Logistic曲线能够很好地模拟不同水分调控条件下的水稻茎蘖动态变化规律,模拟结果显示,土壤水分控制条件下水稻茎蘖动态具有增长受限、增长过程提前、茎蘖消亡减小、消亡高峰延迟的特点.Based on soil moisture regulation tests on rice during the tillering period,the effect of soil moisture regulation on shoot dynamics of rice cultivated in plastic film mulched dryland was studied.A model for the shoot dynamics was established by use of the nested Logistic curve.On such a basis,the variation of model parameters and the characteristics of shoot dynamics were discussed under different soil moisture regimes.The test results show that the shoot dynamics of rice cultivated in plastic film mulched dryland has new situations.The increase of tillering number in plastic film mulched dryland is slower than that in shallow irrigation treatment.The time reaching the maximum tillers is delayed about 10～20 d.With the decrease of soil moisture,the maximum tillers decrease.For the treatment scheme No.3 with the lowest soil moisture,the maximum tillers are achieved because of the compensation effects,though the time reaching the maximum tillers is greatly delayed.The nested Logistic curve is satisfactory in the simulation of shoot dynamics of rice under different soil moisture regimes.The simulated results indicate that the shoot dynamics of rice under different soil moisture regimes is characterized by restricted growth,early time,decrease of tillering consumption and delay.

关 键 词：水稻 茎蘖动态 水分调控 套接Logistic曲线 

分 类 号：S276[农业科学—农业水土工程]