1·Vegetation cover is an important component of environmental factors, and is also the best indication to reflect the regional ecological environment.
植被是环境的重要组成因子，也是反映区域生态环境的最好标志之一。
2·Semi arid climate, poor vegetation cover and highly erodible loess can be regarded as the main natural factors responsible for the formation of hyperconcentrated flows in the Loess Plateau, China.
黄土高原半干旱的气候条件、稀疏的植被和疏松易蚀的黄土物质，是该地区高含沙水流形成的自然地理因素。
3·Furthermore, the geographical distributions of the ice sheets, vegetation cover and coastlines during the ice age are well mapped.
另外，冰期时的冰原、植被与海岸线的地理分布也已经绘测完成。
4·We conjecture that the increased vegetation cover result in improved leaves albedo, and then the reduced the solar radiation reaching earth surface.
这可能与植被的叶面反射率增加导致了到达地表的太阳辐射量减小所致。