【摘要】 干旱河谷是长江上游植被恢复的重点和难点地区。本文就其环境生态特征 ,以及植被恢复过程中的树种选择、模式建立有关方法原则和初步结果进行了较为系统的研究总结。更多还原

【Abstract】 Arid valley on upper branches of Changjiang river is the largest dry valley area in the world, which is also one of the hardest and key area for reforestation and ecological restoration. Its ecological characteristics are, ①inefficient precipitation with low utilization and strong vaporization, ②flimsy and leanness soil can accommodate only limited water and plants, ③sparsity short shrub with low biomass and biodiversity and ④intensity human interference. Research indicates, regardless which subdivision refer to reforestation difficulty, i. e. the most difficult, rather difficult, and difficult sub-area, the first and very important step is to select compatible plant species. Selecting methods mentioned include document research, field observation, experiment measuration, community investigation; corresponding results (e. g. which species can survive what sub-area)are also expounded. Different species configure mode listed, in which the tree and grass symbiotic prosperity mode is stressed, and the relevant socioeconomic benefits briefly analyzed in the paper.更多还原