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2013年12月至2014年2月,在长寿区龙河镇丘陵地带不同位置的柑桔树冠上安装自动温湿度记录仪定时记录温度,将树冠实测温度与果园气象观测站、长寿区气象站的温度进行比较,利用线性回归建立关系模型。结果表明,试验期间不同观测点日平均气温的总体趋势为气象站>观测站>柑桔树冠,果园不同位置柑桔树冠日平均气温总体趋势为浅丘上部>浅丘中部>浅丘底部。气象站和观测站的最低温度为-0.1和-2.0℃,浅丘果园底部树冠最低温度可达-4.7℃。最低温<-2℃(柑桔果实冻害临界温度)的天数,气象站和观测站均为0d,浅丘果园底部树冠至少有4d。浅丘底部树冠温度(T)与气象站实测温度(Ta)的关系模型为T=1.188 3 Ta-3.893 1(R2=0.732 8),与气象站预报温度(Tc)的关系模型为T=1.202 3 Tc-3.936 5(R2=0.600 8)。当气象站的预报或实测最低温为1.6℃左右时,浅丘底部柑桔树冠最低温即可能低至-2℃,应采取防冻措施。
From December 2013 to February 2014, an automatic temperature and humidity recorder was installed on the canopy of citrus in different locations in the hilly area of Longhe Town, Changshou District to record the temperature regularly. The measured temperature of the canopy was compared with that of orchard meteorological observation station and the weather station of Changshou District Temperature comparison, the use of linear regression to establish the relationship model. The results showed that the general trend of daily mean air temperature at different observation points during the experiment was weather station> observation station> citrus canopy. The daily average temperature of citrus canopy at different positions in the orchard varied from upper part of shallow hill> middle part of shallow hill> bottom of shallow hill. The minimum temperature of the weather station and observation station is -0.1 and -2.0 ℃, and the minimum crown temperature at the bottom of shallow orchard can reach -4.7 ℃. The lowest temperature <-2 ℃ (citrus fruit frost damage critical temperature) days, the weather station and the observation station are 0d, the bottom of the canopy orchard at least 4d. The model of T = 1.188 3 Ta-3.893 1 (R2 = 0.732 8) and the relationship between the temperature at the base of canopy and the observed temperature (Tc) at the bottom of the shallow hill are T = 1.202 3 Tc-3.936 5 (R2 = 0.600 8). When the weather station forecast or measured minimum temperature is about 1.6 ℃, the bottom of the canopy at the bottom of the lowest possible temperature of citrus can be as low as -2 ℃, antifreeze measures should be taken.