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首页> 外文期刊>International journal of remote sensing >Modelling corn production in China using AVHRR-based vegetation health indices
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Modelling corn production in China using AVHRR-based vegetation health indices

机译：使用基于AVHRR的植被健康指数模拟中国的玉米产量

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Weather-related crop losses have always been a concern for farmers, governments, traders and policy makers for the purpose of balanced food supplies, demands, trade, and distribution of aid to nations in need. Therefore, early crop loss assessment in response to weather fluctuations is an important issue. This paper discusses the utility of Advanced Very High Resolution Radiometer (AVHRR)-based vegetation health indices as a proxy for modelling corn yield and for early warning of drought-related losses of agricultural production in China. The indices were tested in Jilin province on corn yield during 1982-2001 using correlation and regression analysis. A strong correlation between corn yield and the vegetation health indices were found during the critical period of corn growth, which starts 2-3 weeks before and 2-3 weeks after corn tassel. Following the results of correlation analysis, several regression equations were constructed where vegetation health indices were used as independent variables. The estimates of corn yield can be carried out well in advance of harvest and the errors of the estimates are 7-10%. The errors become smaller when the estimations are related to losses in corn yield due to drought.
机译：与天气有关的农作物损失一直是农民，政府，贸易商和决策者关注的问题，目的是平衡食品供应，需求，贸易和向有需要国家的援助分配。因此，针对天气波动的早期作物损失评估是一个重要的问题。本文讨论了基于超高分辨率高分辨率辐射计（AVHRR）的植被健康指数在模拟玉米产量和预警与干旱相关的中国农业生产损失方面的作用。使用相关和回归分析对吉林省1982-2001年玉米单产进行了测试。在玉米生长的关键时期发现玉米产量与植被健康指数之间有很强的相关性，该关键时期始于玉米流苏的前2-3周和之后的2-3周。根据相关分析的结果，构建了几个回归方程，其中以植被健康指数为自变量。玉米产量的估算可以在收割之前进行，估算误差为7-10％。当估计值与干旱造成的玉米产量损失有关时，误差会变小。

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