论文部分内容阅读
为了加速恢复陕北黄土丘陵沟壑区残留的天然植被,改变恶化了的生态环境,实现良性循环,1975年以来,我们在安塞县水土保持实验区开展了植被演替规律、封山加补种恢复天然植被和建立人工复层植被试验,为较快地恢复天然植被和建立人工植被提供技术与途径。一、自然概况和植被概况(一)自然概况陕北黄土丘陵沟壑区,在植被区划上属暖温带落叶阔叶林地带和森林草原地带。这些植被地带的自然概况:1、延安以南的暖温带落叶阔叶林地带,年平均气温9°—10℃,极端最高气温
In order to speed up the restoration of the natural vegetation left behind in the loess hilly and gully regions in northern Shaanxi, change the deteriorating ecological environment and achieve a virtuous circle, we carried out the law of vegetation succession in Ansai County Experimental Soil and Water Conservation Area since 1975, Restoration of natural vegetation and the establishment of artificial stratum vegetation test, to provide faster recovery of natural vegetation and artificial vegetation to provide technology and ways. First, the natural overview and vegetation Overview (A) of the natural profile Loess Plateau in northern Shaanxi gully area, in the vegetation division is a warm temperate deciduous broad-leaved forest zone and the forest steppe zone. The natural overview of these vegetation belts: 1. Warm temperate deciduous broad-leaved forest zone south of Yan’an with an annual average temperature of 9 ° -10 ° C, extreme maximum temperature