摘要
策勒绿洲位于塔克拉玛干沙漠南缘 ,绿洲边缘的自然植被带是保护绿洲的天然屏障。近 5 0年来 ,绿洲边缘的自然植被带遭到严重破坏 ,绿洲生态系统受到沙漠化的严重威胁。恢复重建绿洲边缘自然植被带的限制因素是水 ,通过综合研究确定具备可靠防护功能的不同植被类型的盖度指标 ,是恢复重建绿洲边缘自然植被过程中节约用水的基础。本研究通过对策勒绿洲边缘沙物质的粒度分析 ,起动风速的风洞实验 ,绿洲边缘风速的长期测定以及不同植被类型防护效益的野外观测 ,确定策勒绿洲边缘不同植被类型的盖度指标为 :●柽柳灌木群落盖度 :≥ 2 0 % ;●骆驼刺草本植物群落盖度 :≥ 30 % ;●花花柴草本植物群落盖度 :≥ 30 % ;●芦苇草本植物群落盖度 :≥ 30 %。
Cele oasis is located in the southern marginal zone of Taklamakan Desert, and the natural vegetation in the marginal zone of the oasis is the natural shelter for protecting the oasis. The natural vegetation, however, has been seriously destroyed since recent 50 years, and the ecosystems of the oasis are seriously threatened by desertification. The main restricting factor for rehabilitating and reestablishing the natural vegetation is the shortage of water. Through a synthetic research, it is considered that it is the basis for economizing water in the rehabilitating and reestablishing of the natural vegetation in the margin of the oasis to determine the minimal coverage indexes of the different species of vegetation with a reliable shelter function. After analyzing the granularity of the sand material, measuring the sand-raising wind speed in a wind-tunnel in a long term and observing the shelter effects of the different species of vegetation, the following minimal coverage indexes of the different species of vegetation are determined for rehabilitating and reestablishing the natural vegetation in the margin of Cele oasis: The coverage of Tamarix spp. shrubbery community: ≥20%; That of Alhagi sparsifolia herbaceous community: ≥30%; That of Karelinia caspica herbaceous community: ≥30%; And that of Phragmites communis herbaceous community: ≥30%.
出处
《干旱区研究》
CSCD
2002年第2期12-16,共5页
Arid Zone Research
关键词
沙漠化
策勒绿洲边缘
自然植被
恢复重建
盖度指标
Cele Oasis
natural vegetation
rehabilitating and reestablishing
desertification.
