基于ORYZA 2000模型的鄂北地区水稻水分生产函数构建

Water Production Function of Paddy Rice in North Hubei Province Based on ORYZA 2000 Model

湖北省北部地区水资源短缺,有限降水难以满足水稻需水量,需要实施灌溉以补充水分。为此,根据长渠灌溉试验站水稻灌溉试验成果,基于ORYZA 2000模型构建了鄂北地区水稻生长模型。根据不同受旱阶段及受旱水平设置了多种受旱方案,利用构建的模型模拟分析了不同受旱方案水稻需水量和产量的变化规律。结果表明随受旱程度的增加,水稻需水量与产量呈现降低的变化趋势。在模拟成果分析基础上,根据最小二乘法原理,计算分析得到了Jensen模型中不同生育阶段敏感系数,构建了鄂北地区水稻水分生产函数,对指导当地水稻灌溉具有重要意义。

Irrigation is required in the north of Hubei Province as scarce water resource and limited precipitation could not meet the water demand of rice growth. In view of this, we built a paddy rice growth model for northern Hubei Province based on ORYZA 2000 model according to the results of irrigation test at Changqu irrigation station. By using the proposed model, we simulated the variation rules of water demand and yield of paddy rice in different drought conditions （different growth periods and drought levels）. Results revealed that the water demand and yield of paddy rice decreased with the aggravation of drought. On this basis, we obtained the sensitivity coefficients at dif- ferent stages, and established the water production function of paddy rice in association with the Jensen model and the least squares theory. The results could guide the irrigation of paddy rice in northern Hubei Province.