The last decade was marked by the special interest in flora, biological characteristics, its adaptation to climate fluctuations and the influence of human activities. The steppe climate is generally characterized by i...The last decade was marked by the special interest in flora, biological characteristics, its adaptation to climate fluctuations and the influence of human activities. The steppe climate is generally characterized by its heterogeneity. The lower semi-arid： 300 mm to 400 mm per year; The arid higher： 200 mm to 300 mm per year; The arid lower： between 100 mm and 200 mm per year. Its wide analysis of a region is based on data provided by weather stations; a summary of the climate study area was analyzed with representative stations （Ain Sefra, El Aricha, Ras el-Ma, Saf-Saf）. This steppe is in various states of degradation, consisting of Stipa tenacissima, Artemisia herba alba, Biscutella didyma, Spartium junceum and Lepidium glastifolium, etc..展开更多
文摘The last decade was marked by the special interest in flora, biological characteristics, its adaptation to climate fluctuations and the influence of human activities. The steppe climate is generally characterized by its heterogeneity. The lower semi-arid： 300 mm to 400 mm per year; The arid higher： 200 mm to 300 mm per year; The arid lower： between 100 mm and 200 mm per year. Its wide analysis of a region is based on data provided by weather stations; a summary of the climate study area was analyzed with representative stations （Ain Sefra, El Aricha, Ras el-Ma, Saf-Saf）. This steppe is in various states of degradation, consisting of Stipa tenacissima, Artemisia herba alba, Biscutella didyma, Spartium junceum and Lepidium glastifolium, etc..
基金supported by National Basic Research Program of China (973 Program,2002CB111405)the National Nature Science Foundation ofChina (30471162, 30671394)the National Key Technologies Research and Development Program of China(2006BAD08A13)~~
