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黄龙山位于陕北黄土高原东南部,是典型残留植被保存较好的次生林区,也是黄河中游的水源林,除能提供一定数量的木材外,并对周围地区的农业起着保障作用。故在生态上了解黄龙山植被保持水土的机理与作用,能为经营次生林和营造水土保持林、水源涵养林提供科学依据。一、自然和植被概况:黄龙山位于北纬约35°25′—36°04′、东经109°35′—110°16′,总面积约390万亩,行政上主要在黄龙县境内。地质岩石主要是三叠纪的砂页和页岩,其上覆盖第三纪
Huanglong Mountain is located in the southeastern part of the Loess Plateau in northern Shaanxi. It is a well-preserved secondary forest area with typical residual vegetation. It is also a water source forest in the middle reaches of the Yellow River. Besides providing a certain amount of timber, Huanglongshan plays a safeguard role in agriculture in the surrounding areas. Therefore, it is ecologically important to know the mechanism and function of Huanglongshan’s vegetation in maintaining soil and water, which can provide a scientific basis for the management of secondary forests and the construction of water and soil conservation forests and water conservation forests. I. Overview of Nature and Vegetation: Huanglong Mountain is located at latitude 35 ° 25’-36 ° 04’N and longitude 109 ° 35’-110 ° 16’E, with a total area of about 3.9 million mu. The administrative area is mainly within Huanglong County. Geological rocks are mainly Triassic sand and shale, which covered the Tertiary