气候变化对天水市林区森林资源的影响

通过天水气候资料、林业资源普查资料和林业产值资料对气候变化对天水市林区森林资源的影响进行了研究。结果表明，影响天水林业资源的主要气象要素是年降水量和年≥0℃积温。20世纪90年代以来由于暖、干气候影响，导致林作物生长季水、热匹配失调，而不利林作物正常生产。具体表现在：人工林育林成活率大幅度下降，幼龄林、中龄林面积和喜湿润耐温凉阔叶、松类树种面积逐年减少，耐高温干旱的侧柏、刺槐等树种面积呈现增加趋势，使传统林龄、林种结构发生了明显变化，林业产值增幅趋势显著减缓。

The Rresponse of State Forest in Tianshui County to Climate Change and Corresponding Countermeasure

By Tianshui climate data,census data of forest resources and forestry output data analysis,the main elements that influence forestry resources in Tianshui meteorology are annual precipitation and annual accumulated temperature ≥ 0 ℃. Since the 90s of the 20th century,because of the warm and dry climate,forest crops experiece water,hot match disorder in its growing season,which do not facilitate normal crop production,such as a significant decline in survival rate of artificial calcareous,the areas of old and young forest,cool humid broadleaf trees,and conifer species gradually reduced,and heat orientalis drought,locust and other species show an increasing trend. Traditional forest age,forest structure has changed significantly,the trend of increase forestry production value significantly slows down.