田间条件下水稻根系钾素吸收限制因子研究  

Analysis of Limiting Factors for K Uptake of Rice Root under Field Condition

作　　者：章明清[1] 李娟[1] 孔庆波[1] 姚宝全 

机构地区：[1]1福建省农业科学院土壤肥料研究所.福建福州350013 [2]福建省农田建设与土壤肥料技术总站.福建福州350003

出　　处：《热带作物学报》2013年第9期1657-1662,共6页Chinese Journal of Tropical Crops

基　　金：国际植物营养研究所合作项目(No.Fujian-09);国家测土配方施肥补贴项目(No.2005-2009)

摘　　要：根据4个钾肥试验结果 ,探讨水培条件下建立的水稻整个生长周期的根系钾素吸收稳态模型在田间条件下的适用性,应用Monte Carlo法校准水稻根系钾素吸收力常数a0、根表面水流速率常数v0和土壤钾素有效扩散系数De等3个关键参数。结果表明:a0和De与土壤理化性状、水稻品种和施肥等因素有关,施钾肥使a0和De下降,但v0值在不同试验点或处理中基本一致;由a0和v0校准结果计算得到的根系钾素吸收力a和根表面水流速率V0及De的数值,与已知的短期生物试验结果有相同的数量级范围;稳态模型模拟值与田间水稻不同生育期吸钾量实测值具有显著水平的一致性,一元回归方程的斜率为0.914 0;对照处理的模拟误差为(9.13±3.20)%,施钾处理则为(8.42±3.04)%。参数敏感性分析结果表明,水稻钾素吸收限制因子主要是土壤溶液钾浓度Cli、根系钾素吸收力常数a0和根长L。According to the steady-state model set up in the water culture on rice, the feasibility of the model under field condition based on 4 experiments for K in a growth period of rice was studied. Three key parameters in the model, K absorbing power constant（ao）, fluid flow velocity constant（vo）on root surface and K effective diffuseion coefficient（De）in the soil, were calibrated using Monte Carlo method. We found that ats vo and De were affected by the physical and chemical properties of soil, rice varieties and fertilization, a0 and vo would be decreased with K fertilizer applied. But vo value was quite stabilized in different experimental sites or treatments. The value of De, K absorbing power（a）and fluid flow velocity（v0）on the root surface that were calculated by a0 and vo respectively had the same order of magnitude compared with the plant experiments of seedling stage. There was significant coherence between simulated value and measured value of K uptake in different growth period of rice and the slop of linear regression equation was 0.914 0. Simulated error of CK and K fertilizer treatments were only （9.13＋3.20）% and （8.42＋3.04）%, respectively. Sensitivity analysis for parameters showed that the limited factors of K uptake on rice was K concentration（Cli）, K uptake contant（ao）and root length（L）.

关 键 词：水稻 钾 稳态模型 田间条件 吸收 限制因子 

分 类 号：S511[农业科学—作物学]