Improvement and stabilization of rice production by delaying sowing date in irrigated rice system in central China
Improvement and stabilization of rice production by delaying sowing date in irrigated rice system in central China
复制标题
华中地区水稻灌溉系统推迟播期提高和稳定水稻产量
DOI：
10.1002/jsfa.10053
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发表时间：
2019-11-21
影响因子：
4.1
通讯作者：
Cao, Cougui
中科院分区：
文献类型：
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作者：
Tu, Debao;Jiang, Yang;Cao, Cougui
背景气候变化对水稻生产提出了巨大挑战。温度和太阳辐射在中国中部地区有显著的变化。本研究旨在分析不同水稻基因型对华中地区温度和太阳辐射变化的响应，并寻求确定最佳播期的方法，以提高和稳定水稻产量。为此，四个水稻基因型（两个籼稻和两个粳稻品种）在两个地点的灌溉条件下，在2年的6个播种期栽培。结果研究了不同物候期水稻产量、资源利用效率、日平均气温和太阳辐射的变化。在华中地区，水稻产量可提高2-17%。与太阳辐射相比，温度是影响华中地区水稻产量的重要因子。产量与各物候期平均气温呈极显著正相关，尤其是抽穗后20天（GT 20）。此外，我们的结果表明，当GT 20在24.9-26.4 ℃范围内时，籽粒产量表现出微小的变化。然而，GT 20在大多数情况下高于26.4摄氏度，由于气候变化，这种情况变得更加频繁。对近25年来气候变化的分析表明，GT 20在24.9-26.4 ℃范围内的出现频率随播期的推迟而增加。结论推迟播种期以达到最佳GT 20（24.9 ℃ ~ 26.4 ℃）是稳定和提高华中地区水稻产量和资源利用效率的有效策略。(c)2019化学工业协会
BACKGROUND Climate change has posed great challenges to rice production. Temperature and solar radiation show significant variations in central China. This study aims to analyze the responses of different rice genotypes to the variations of temperature and solar radiation in central China, and to find the way of identifying the optimal sowing date to improve and stabilize rice production. For this end, four rice genotypes (two Indica and two Japonica cultivars) were cultivated at two locations under irrigation conditions in 2 years with six sowing dates. RESULTS We investigated variations of rice grain yield, resource use efficiency, average daily temperature and solar radiation during different phenological stages. Rice grain yield could increase by about 2-17% in central China. Compared with solar radiation, temperature was a more important factor affecting rice grain yield in central China. The grain yield showed great correlation with the means temperature during different phenological stages, especially during the first 20 days after heading (GT20). Besides our results demonstrated that the grain yield displayed slender variations when the GT20 was within 24.9-26.4 degrees C. However, GT20 was higher than 26.4 degrees C in most cases, which became more frequent due to climate changes. Analysis of climate change during the last 25 years revealed that the frequency of GT20 within 24.9-26.4 degrees C was increased by the delay of sowing date. CONCLUSION We propose that delaying sowing date to achieve the optimal GT20 (24.9 degrees C-26.4 degrees C) can be an effective strategy to stabilize and improve rice grain yield and resource use efficiency in central China. (c) 2019 Society of Chemical Industry