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本文初步研究了杂交水稻(汕优6号)生育后期(拔节孕穗期至成熟期)透冠水的化学组成及其在稻田生态系统养分再循环中的作用。结果表明,自然降水穿过水稻冠层之后其化学组成发生明显变化,氮、磷、钾、钙、镁和硅等元素的浓度都有所增加。乳熟期出现氮、钾、钙、镁和硅浓度的“峰值”。计算养分通过透冠水的再循环量氮达15.91kg/ha,磷、钾、钙、镁和硅分别为1.11、3.78、1.13、1.70和8.52kg/ha。养分(特别是氮素)通过透冠水返回土壤很可能是稻田生态系统养分再循环的重要机制。
In this paper, the chemical composition of the water in the crown and crown of hybrid rice (Shanyou 6) at late growth stage (booting stage to maturity stage) and its role in nutrient recirculation of paddy field ecosystem were preliminary studied. The results showed that the chemical composition of natural rainfall changed obviously after it penetrated the rice canopy, and the concentrations of nitrogen, phosphorus, potassium, calcium, magnesium and silicon increased. The “peak” concentrations of nitrogen, potassium, calcium, magnesium and silicon occur during milk ripening. Nitrogen was 15.91kg / ha and phosphorus, potassium, calcium, magnesium and silicon were 1.11, 3.78, 1.13, 1.70 and 8.52kg / ha, respectively. The return of nutrients (especially nitrogen) to soil through dripped water is likely to be an important mechanism for nutrient recycling in paddy ecosystems.