根据遥感方法评估干旱对雨水玉米水足迹的影响
1Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains, Ministry of Education, School of Geographical Sciences, Northeast Normal University, Changchun, China.
Journal of the science of food and agriculture
|September 22, 2023
概括
干旱对雨水玉米的水足迹 (WF) 有重大影响,大多数地区的绿水减少,蓝水增加. 这些影响在空间和干旱时间尺度上有所不同,为气候变化适应提供了洞察力.
科学领域:
- 农业科学 农业科学
- 环境科学 环境科学
- 水文学的水文学
背景情况:
- 干旱严重影响作物用水量,需要进行定量影响评估.
- 了解作物用水对干旱的反应对于农业的可持续性至关重要.
- 吉林省的雨水玉米特别容易受到干旱对生长和用水消耗的影响.
研究的目的:
- 评估生长季干旱对吉林省玉米水足迹的影响.
- 在各种时间尺度上调查玉米WF对干旱的反应.
- 为农业用水在气候变化中的适应战略提供见解.
主要方法:
- 利用遥感方法计算水足迹 (WF) 和标准化降水蒸发透气指数 (SPEI).
- 在干旱条件下分析了WF蓝色和WF绿色变化的空间分布.
- 检查了每月和每年时间表上对玉米 WF 的干旱影响.
主要成果:
- 在68%的像素中,WF绿色显著下降,主要是在中间区域.
- 蓝色的WF显示了72.94%的像素的非显著增加.
- 受干旱影响的地区在空间上有所不同,每月干旱影响中部地区,每年干旱影响西部地区.
结论:
- 干旱改变了农业用水的来源和结构,在不同的时间尺度和空间位置上对水源价值产生不同的影响.
- 调查结果突出了干旱对玉米用水的影响的显著空间异质性.
- 这项研究为管理雨水养玉米和适应农业用水量以应对气候变化提供了宝贵的数据.
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