Soil Water Content and Plant's Reflection Under Extreme NaturalDrought on Songnen Grassland

Natural drought is a kind of disturbance. Authors studied water content in soil and plant's reflection under extreme natural drought on Songnen grassland in this paper. The results show: there exist significantly linear relation between Aneurolepidium Chinensis aboveground biomass and height and water content where the roots of plant were focused,the coefficient indexes are 0.98 and 0.94 respectively, which show the water content and natural drought depth are significantly different. The norms to value the intensity of natural drought disturbance aboveground biomass and water content where the root of plant is focused in native dominant plant community under typical habit are put forward also.