Chinese Journal of Rice Science

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Analysis of Climatic Factor Effects on the Caloric Value of Two Rice Varieties under Different Nitrogen Levels

YANG Jing-ping; Wekesa BONIFACE; JIANG Ning; CHEN Jie   

  1. (Institute of Agro ecology; Zhejiang University; Hangzhou 310029; China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-07-10 Published:2001-07-10

不同氮素水平下气象因子对两种水稻热值影响的分析

杨京平; Wekesa BONIFACE; 姜 宁; 陈 杰   

  1. 浙江大学 农业生态研究所, 浙江 杭州 310029

Abstract: The relationship between the climatic factors and the caloric value of two rice varieties (early rice Jiayu 948 and late rice Jiayu 93390)under different N levels(0, 80, 120, 160, 200 kg/hm2)was analyzed in 1999. The results indicated that the caloric value varied in the developmental stage of rice with the lowest value appearing at panicle initiation and the highest value at maximum tillering or flowering stage. The caloric value increased with the increase of N amount in two varieties. The main climatic factors produced the influence on the rice caloric value were daily temperature gap, minimum temperature, total hours of sunshine, daily mean hours of sunshine, rainfall. The hours of sunshine produced negative effects on the caloric value. The daily temperature gap accounted the main effects on the caloric value of two rice varieties and with the minimum coefficient variation. The minimum temperature showed the negative impact on the early rice caloric value with great variation. The experiment results indicated the caloric value of early rice was 17058 J/g and that of late rice was 16978 J/g in average. The temperature produced main effects on the caloric value in early rice, which was greater than that of hours of sunshine or radiation, but for late rice the temperature and hours of sunshine played more important effect on the caloric value than rainfall.

Key words: caloric value, rice, nitrogen, climatic factor, relationship

摘要: 对两种水稻类型在不同氮素水平下植株的热值变化与气象因子关系进行了分析。结果表明,水稻热值随着生长发育的进程存在着动态变化。两种水稻的热值最低值出现在幼穗分化期,最大值出现在分蘖期或开花灌浆期。随着施氮水平的增高,水稻的热值也增加,表明水稻的热值是一个与水稻生长发育及外界环境因子密切相关的动态变化指标。无论氮素水平的高低,光照因子(总日照时数、平均日照时间)对两种水稻有负影响效应。温度日较差对热值有正影响效应,且具有较低的变异系数,雨量与雨日的正效应起修饰作用。最低温度对热值具负影响作用,表现出大的变异系数。实际测定早稻的平均热值为17058 J/g,晚稻为16978 J/g,说明早稻的热值要高于晚稻。气象因素分析表明对于早稻感温型品种来讲,温度效应对热值的影响可能要大于日照对于热值的影响效应,而温度和日照对晚稻的热值影响效应要大于降雨量的效应。

关键词: 热值, 水稻, 氮素, 气象因子