2004/2005年冬季连江县低温考察和橄榄树冻害指标初探

Investigation of Low Air Temperature and Preliminary Study of Indexes of Olive Freeze Harm in the Winter of 2004/2005in Lianjiang County

通过对浦东农场两个山坡地晴天的低温考察得出:相对高差小于50m的山坡,最大的逆温出现在坡顶;相对高差为80m的山坡,最大的逆温出现的坡位约为相对高差的0.88倍处。从坡底到最大逆温效应出现的坡位,最低气温随着高度的升高而升高。2004/2005年冬季低温,浦东农场海拔44m以下的橄榄树全部受冻,海拔越低,冻害越严重;68-85m处的橄榄树基本都未受冻,这是坡地逆温影响所致。据对14个考察点附近的橄榄树冻害调查资料和相应的低温资料进行初步分析,得出:当最低气温低于2.0℃时,橄榄树叶片受冻;当最低气温低于2.7℃时,橄榄树末一枝条受冻;当最低气温低于3.0℃时,橄榄树末二枝条受冻,研究结果可为当地橄榄的发展、布局和防冻提供依据。

The investigation of low air temperature in two farms in Lianjian County was made. The results showed that the biggest temperature inversion occurred in the top of the hill, when the relative height of hill is below 50m. The biggest temperature inversion occurred in about 70m, while the relative height of hill is 80m, In the course of low air temperature in the winter of 2004/2005 in Pudong farm of Lianjian County, olives which planted below 44m above sea level suffered freeze harm, while olives which planted between 68m to. 85m above sea level did not suffer freeze harm. When the minimum air temperature is below - 2.0℃, olive leaves would be frozen. When the minimum air temperature is below - 2.7 ℃, the first top sticks of olive would suffer freeze. When the minimum air temperature is below - 3.0℃, the second top sticks of olive would be frozen.