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一、前言秦岭南坡地处暖温带和北亚热带之间,是我国南北植物交汇的地带,植物种类丰富,类型复杂,垂直分布明显。研究秦岭中段南坡森林类型的特征、分布规律和发展趋向,对指导当前林业区划和今后发展人工造林、次生林改造以及开展林业科学试验都有极为重要的意义。为此,我们今年从汉江北岸(秦岭山麓)至茅坪、华阳,直到最高峰活人坪梁,进行了实地考察。活人坪梁是汉中地区秦岭的最高峰(海拔3071米),也是汉江主要支流之一酉水河的发源地。地貌特征是:山高,沟深,坡陡(多在40度以上),高差大(高出邻近谷底1000米,高出盆地平原2500米)。由于气候寒冷,受风雪的强烈影响,机械、寒冻风化在山顶形成的乱
I. Preface The south slope of the Qinling Mountains is located between the warm temperate zone and the north subtropical zone. It is a zone where plants of North and South China meet. The plant species is rich in types and complex with obvious vertical distribution. Studying the characteristics, distribution and development trend of forest types on the southern slope of Qinling Mountains is very important to guide the current forestry zoning and the future development of afforestation, secondary forest reforestation and forestry scientific experiments. To this end, we conducted a field visit this year from the northern bank of the Han River (Qinling foothills) to Maoping and Huayang until the peak of the living Pingling. The living Pingling is the highest point of the Qinling Mountains in Hanzhong area (3071 meters above sea level) and the birthplace of the Yushui River, one of the major tributaries of the Han River. Geomorphological features are: mountain height, ditch depth, slope steep (more than 40 degrees), large height difference (higher than the adjacent valley 1000 meters, 2500 meters above the basin plain). Due to the cold weather, strongly influenced by the snowstorm, the weathering of machinery and freezing on the top of the hill