图们江下游地区积温与粮豆产量的相关性

Interrelationship between accumulated temperature and output in the area of Tumen river

图们江下游地区５～９月份历年最高积温为２８３１．６℃，历年最低积温为２４８６．０℃，历年平均积温为２６１７．４℃，适合于种植中熟、中早熟、早熟作物．积温的大小影响粮豆产量，其相关性显著．据分析，历年水稻产量与积温的相关系数Ｒ＝０．９１，不同地区不同积温的相关系数Ｒ＝０．７３．历年旱田作物的平均产量与积温的相关系数Ｒ（玉米）＝０．８０，Ｒ（大豆）＝０．９３．因此在土地适宜性评价中积温作为参评因素是合理的。

The highest,the lowest and the average accumulated temperatures in the lower reach of Tumen river respectively are 2831.6℃,2486.0℃ and 2617.4℃.The result of study shows that the R ,relative index between rice output and accumulated temperature,is R=0.94 ,and it changes in the different parts of this area as 0.73.The accumulated temperature can be treated as reference index of land evaluation.