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河北平原黑龙港流域。多年来旱、涝、碱、干热风等自然灾害频繁,农业生产低而不稳。建立多林种相结合的综合防护林体系可以改善这一地区的生态环境,防御各种自然灾害对农业生产的危害,提高农作物的产量和质量。建立综合防护林体系的关键是因地制宜的选择优良树种,采取科学的造林方法。本区属干旱、半干旱地区,光热资源有余,水分不足,造林成活率低,是阻碍综合防护林体系建设的限制因子。因此,在饶阳试区综合防护林体系建设中,针对本地的自然条件特点,采取开沟和适当深栽相结合的造林方法,收到了良好效果,现介绍如下。一、自然条件概况饶阳县位于黑龙港地区中部,地理位置在北纬38°04′～21′,东径115°33′～53′,属暖温带半干旱大陆性气候。年平均降水量
Hebei Heilonggang River Basin. Over the years drought, waterlogging, alkali, dry and hot winds and other natural disasters, low and unstable agricultural production. Establishing a multi-forest integrated shelterbelt system can improve the ecological environment of this area, prevent the damage caused by various natural disasters to agricultural production and increase the yield and quality of crops. The key to establishing an integrated shelter forest system is to select good tree species according to local conditions and adopt a scientific afforestation approach. This area belongs to arid and semi-arid areas, with more light and heat resources, insufficient water resources and low afforestation survival rate, which are the limiting factors that hinder the construction of comprehensive shelterbelt system. Therefore, in the construction of comprehensive shelter forest system in Raoyang district, the afforestation method combining the combination of ditching and appropriate deep planting has been received according to the local natural conditions and features, and the good results are presented as follows. I. Overview of Natural Conditions Raoyang County is located in the central part of Heilonggang Region. Its geographical location is between 38 ° 04 ’~ 21’ north latitude and 115 ° 33 ’~ 53’ east longitude. It belongs to the warm temperate semi-arid continental climate. Average annual precipitation