摘要
应用农田水氮管理模型(water and nitrogen management model,WNMM)模拟潮土水氮运移过程,以建立针对该地区气候环境和土壤性质的田间水氮优化管理方案。利用田间试验对WNMM模拟结果进行了校验,结果表明该模型能较好地模拟潮土地区的土壤水氮运移过程,农田蒸散量、土壤含水量和硝态氮含量的模拟值与实测值在α=0.01水平上相关显著,误差范围也令人满意。根据土壤实时水氮含量数据,建立了按作物生长亏缺动态调整灌溉、施氮的优化农田水氮管理方案。在多年平均气象条件下,与传统管理模式相比,优化管理模式不仅能为作物生长提供更好的土壤水肥条件,而且每年可节约灌溉水163.5mm、氮肥130kg.hm-2,减少土壤水渗漏264.6mm、氮素淋失71.1kg.hm-2。
A water and nitrogen management model （WNMM） was used to simulate the soil water and nitrogen dynamics in fluvo-aquic soil, with a view to establishing a scheme to optimize soil water and nitrogen in light of local climate and soil properties. The model was validated by field experiments in fluvo-aquie soil. Results show that the model did good in simulating water and nitrogen dynamic. The simulated values of evaportranspiration, soil water and nitrate content displayed significant correlation （α = 0.01 ） with measured values, and the deviation are acceptable. Based on real-time data of soil water and nitrogen content, an optimal irrigation and fertilization scheme was figured out. Under the average climate conditions of years, the scheme could not only provide a preferable soil environment for crop growth, but also save irrigation water by 163.5 mm and nitrogen fertilizer by 130 kg . hm^-2 and decrease soil water and nitrogen leaching by 264.6 mm and 71.1 kg . hm^-2 , respectively, each year.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2009年第1期62-68,共7页
Journal of Ecology and Rural Environment
基金
国家重点基础研究发展计划(2005CB121103)
国家科技支撑计划(2006BAD10A06-03)
中国科学院知识创新工程重要方向项目(KZCX2-YW-406)
国家自然科学基金(40571069)
关键词
潮土
土壤水氮运移
水氮管理模型
优化管理模式
fluvo-aquic soil
soil water and nitrogen dynamics
water and nitrogen management model （WNMM）
optimal management pattern
