前言我省为北亚热带和温暖带过渡气候,适生树种很多,但由于多年来在一些地区存在着造林不见林,成林不成材,或者虽然栽培成活但生长缓慢等情况,这与没有掌握当地适生树种和气温指标有关。为了发挥各地区林业生产潜力和充分利用气候资源,试以温暖指数(即一年中平均5℃以上的月平均温度各减去5℃后的累计值),参考寒冷指数(即平均温度5℃以下的平均温度各减去5℃后的累计值),作为林种分布的限制因素,以正确判断适生乡土 Preface The province has a transitional climate for the North Subtropics and warmth. There are many tree species suitable for living. However, in some areas there are some areas where there is no afforestation, no forest afforestation, or slow growth although the planting is still alive. However, Suitable tree species and temperature indicators. In order to give full play to the potential of forestry production and make full use of climatic resources in different regions, the warming index (that is, the average value after subtracting 5 ℃ from the monthly average temperature above 5 ℃ in a year) The following average temperature minus 5 ℃ after the cumulative value), as a limiting factor for the distribution of forest species in order to correctly determine the suitable local