吉林省主要作物产量变化特点的初步分析

Preliminary Analysis on Yield Change Characteristic of Main Crop

采用功率谱分析、周期图分析、方差分析以及计算转移概率等多种统计分析方法，对吉林省４０年来的五种作物产量的变化特点进行了分析．结果表明，五种作物的增产年数均多于减产年数；减转增的概率明显大于增转减的概率；增产持续时间和增产幅度增大于减产年；五种作物的产量表现出较普遍的４～５年和１３年的波动周期．

Using many statistical analysis method include power spectrum analysis,analysis of periodic chart and analysis of vaviance,analysis the yield change characteristic of five crops.The result showed:the number of yield increase years were all more than those of drop in crop yield;the probability of drop in to increase was obviosly higher htan that of increase to drop in;sustained time and amplitude of yield increase were all higher than the year of drop in crop yield;five crops yield showed wve period of 4-5 years and 13years.