论文部分内容阅读
近年来,随着我国各项建设事业的发展,党和国家就保护森林发展林业的问题,做出了一系列决定,采取了许多重大措施。但由于我国在森林的防护效益方面,还缺乏必要的定量分析,在对许多问题的认识上,还停留在感性阶段。这样就无法正确估计和有效发挥森林的防护效益。本文通过对黑龙江省森林其各项气候、水文因子间相关关系的分析,来探索森林在几种主要防护效益方面的定量指标。同时也试图寻求对大面积森林防护效益的研究方法,为制定森林复被率规划提供依据。一、自然条件及森林分布的特点黑龙江省位于我国东北边境,南起北纬43°2′,北到53°34′;西自东径121°10,东到135°。总面积4690万公顷。境内相继有大、小兴安岭和长白山北部支脉自西北到东南贯穿全境,地势西高东低,中部高两侧低。西北部大兴安岭最高峰海拔1528米,东北部三江平原最低为100米,一般在400到800米间,地貌多
In recent years, with the development of various construction undertakings in our country, the party and the state have made a series of decisions regarding the protection of forests and the development of forestry and adopted many major measures. However, due to the lack of necessary quantitative analysis in the protection of forests in our country, our understanding of many issues remains at the perceptual stage. This can not correctly estimate and effectively play the protective benefits of forests. In this paper, through the analysis of the correlation between climate and hydrological factors in the forest of Heilongjiang Province, this paper explores the quantitative indexes of forest in several main protective benefits. At the same time, it also tries to find a research method on the benefit of large-scale forest protection and provide the basis for the planning of forest reforestation rate. First, the natural conditions and characteristics of forest distribution Heilongjiang Province is located in the northeast border of China, north latitude 43 ° 2 ’, north to 53 ° 34’; West from the east diameter 121 ° 10, east to 135 °. The total area of 46.9 million hectares. There are successively large and small Xing’an Mountains in the territory and the northern branch of the Changbai Mountains runs through the whole territory from northwest to southeast. The terrain is high in the west, low in the east and low on both sides in the middle. Northwest Daxinganling peak 1528 meters above sea level, the northeast of the Sanjiang Plain minimum 100 meters, usually between 400 to 800 meters, more landforms