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分析1949-2007年我国主要农产品人均占有量的统计资料,建立粮食、棉花、油料、糖料、水产品人均占有量的向量求和自回归模型,优于单变量求和自回归模型的拟合效果,预测了未来10年我国粮食、棉花、油料、糖料、水产品的人均占有量。 相似文献
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Estimation of yield zones using aerial images and yield data from a few tracks of a combine harvester 总被引：1，自引：0，他引：1
Yield maps derived from yield mapping systems are often erroneous not only due to limitations in measuring the yield precisely
but due to insufficient consideration of the requirements of yield mapping systems in practice as well. Aerial images of cultivated
crop fields at an advanced growth stage frequently provide a spatial pattern similar to that of yield maps. Therefore, the
possibility of generating a yield map using aerial images and measured yield data of a few tracks was examined for a period
of 2 years in two fields grown with cereals. Yield zones based on Visible Atmospherically Resistant Index (VARI) values were
compared with yield zones based on measured yield data of the whole field. About half of the grid cells of a field were allocated
to the same yield zones irrespective of the mode of yield determination. Using the Kruskal–Wallis test, the data sub-sets
of measured yield within the yield zones based on the VARI values differed significantly for all tested yield zones. As a
result, the approach was successful in the case of these experimental sites. 相似文献
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