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一、前言紫阳县近年来飞机播种造林均在春季进行,而且每年飞播面积居安康地区各县之首。然而,由于紫阳县地处大巴山区,山地气候十分明显,故选择春季哪个气候时段进行植树造林最利于提高出苗成活率并节约人力、物力就显得十分重要。本文即对紫阳县的春季造林最佳气候时段作一分析。二、紫阳春季的一些气候特征紫阳春季(3～5月)的平均气温为15.1℃,最高气温16.1℃,最低气温14.2℃,变异系数4%,正常年份占57%。春季升温
I. Introduction Ziyang County in recent years, aircraft sowing and afforestation are carried out in the spring, and the annual area of ?? airborne Ankang counties in the first place. However, since Ziyang County is located in Dabashan Mountain, the mountain climate is very clear. Therefore, it is very important to choose which climate period in spring to plant trees and forestation, which is most conducive to improving the seedling survival rate and saving human and material resources. This paper analyzes the best climatic period of spring afforestation in Ziyang County. Second, some of the Ziyang spring climate characteristics Ziyang spring (March to May) the average temperature of 15.1 ℃, the highest temperature of 16.1 ℃, the lowest temperature of 14.2 ℃, the coefficient of variation of 4%, 57% of normal years. Spring heats up