摘要
为定量研究水稻一个生长周期的氮磷钾吸收特性,开展水培和土培盆栽试验。结果表明,7个水稻品种的30个模拟模型中,有29个模型达到统计显著水平,说明提出的模拟模型能很好地拟合水稻不同生育期的养分吸收动态。由模拟模型分析可得到水稻根系养分吸收常数、最大养分吸收速率和最大养分吸收量及其出现的时间等养分吸收特征参数。根系养分吸收常数平均值是K>N>P;不同品种间根系钾吸收常数有较大差异,氮和磷的差异则较小。养分最大吸收速率和最大吸收量及其出现时间的计算结果表明,水稻氮钾吸收过程基本同步,磷则稍晚。土培试验表明,平衡施肥明显提高水稻根系养分吸收常数、氮磷钾的最大吸收速率和最大吸收量,显著提高根系对氮磷钾的吸收能力。
The water culture and soil culture pot experiments were carried out for quantitative studies of N,P and K absorption characteristics during the whole growth period of rice.The results showed that there were 29 simulation models achieving significant level among 30 models of seven varieties of rice,which indicated the simulation model could be good fit for the nutrient absorption dynamics at different growth stages.According to simulation model,characteristic parameters,such as the nutrient uptaking constant of rice roots,the greatest rate of nutrient absorption,and the maximum nutrient uptake and their time of emergence,were obtained.The average value of root nutrient absorption constant was K N P;there was greater difference among potassium absorption constant of different varieties of rice while the difference among nitrogen or phosphorus was smaller.The calculation results of the greatest rate of nutrient absorption and the maximum nutrient uptake and their time of emergence showed that the absorption process of N and K was basically synchronous while that of phosphorus was later.Soil culture experiment showed that nutrient absorption constant,the greatest rate of nitrogen,phosphorus and potassium absorption and the maximum nutrient uptake were improved by balanced fertilization.The absorptive capacity of the nitrogen,phosphorus and potassium of the root was significantly increased.
出处
《土壤通报》
CAS
CSCD
北大核心
2011年第1期117-122,共6页
Chinese Journal of Soil Science
基金
福建省自然科学基金资助项目(2007J0253)
国际植物营养研究所合作项目(Fujian-09)资助
关键词
水稻
根系
氮磷钾
吸收特性
模型
Rice
Root system
NPK
Absorption characteristics
Simulation model
