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水热条件是森林赖以发生(包括人工林的建立)发展、分布的主要气候因素。北方干旱半干旱区空气干燥,少云多晴天,光照充足,光能资源丰富且光照最强、温度最高、降水量最集中的季节,正是植物的旺盛生长季节。但是,影响干旱半干旱区林业发展、林木生长量高低的主导因素,既不是生长季的热量不足,也不是生长季的辐射总量欠缺,而是受水分条件的限制。因此,干旱
Hydrothermal conditions are the main climatic factors for the development and distribution of forests, including the establishment of plantations. Northern arid and semi-arid areas are air-dry, less sunny and sunny, with plenty of light, rich in light energy and the strongest light, the highest temperature, the most concentrated season of precipitation, it is the plant’s strong growing season. However, the dominant factor that affects the development of forestry in arid and semi-arid regions and the growth of trees is neither the lack of calories during the growing season nor the total amount of radiation during the growing season, but is limited by the water conditions. Therefore, drought