摘要
玛纳斯县北部沙漠的荒漠植被年内变化特征为:4月植被开始返青,5月底植被盖度均较4月减少,6月随着短命植物完成生活史,植被盖度显著降低,7月由于有一定量的降水,植被盖度有所上升,8月后降雨明显减少,大量的一年生草本植物因干旱而死亡,多年生草本植物枯梢和灌木植物生长势降低,植被盖度下降,到10月底植被盖度降到最低。未封育区牲畜采食使植被难以恢复,践踏使沙地不能稳定,梭梭灌木林地风蚀严重,草本植物的数量少于封育区,梭梭灌木林分布不均匀;而封育区植被盖度较大,梭梭灌木林分布较均匀,梭梭灌木林地稳定,形成了较为稳定的自然植被生态系统。试验表明,在当地气候和地理条件下,通过封育或避免人为干预,荒漠区生态植被的自然恢复,可大大增加防风固沙能力,改善当地的生态环境。
The desert vegetation has change characteristics in nortlaem desert of Manasi county during a year. In April the desert vegetation starts to turn green. The coverage of vegetation at the end of May decreases compared with April, and decreases highly along with ephemeral plant finishing life cycle in June. It goes up in July for eertain amount of precipitation. The coverage of vegation was increased in August with the rainfall sharply reducing the most annual herbs die because of drought . In addition, perennial plants are affeeted by dieback and shrubs grow slowly. The coverage of vegetation decreases in August till the end of October. Animals feeding at non - dosed area makes vegetation restore hardly and trample makes sandy areas loose. The erosion of Haloxylon shrub is strong because of small herb plants, less evenness of Haloxylon shrub distribution. In closure land a more stable natural vegetation restoration eco-system is engendered because of bigger vegetation coverage, more evenness of Haloxylon shrub distribution and a stable Haloxylon shrub. The experiment shows that the eco---vegetation can be restored and the eco--environment can be improved under local climate and geography through sandy land enclosure and non human activity.
出处
《新疆农业科学》
CAS
CSCD
北大核心
2009年第5期1144-1148,共5页
Xinjiang Agricultural Sciences
基金
国家林业局中试项目(200401109)
关键词
人工封育
植被更新
干旱荒漠区
artificial fencing
vegetation regeneration
arid hungriness region
