title: [Impacts of forest and precipitation on runoff and sediment in Tianshui watershed and GM models].
abstract: This paper analyzed the impacts of foret stand volume and precipitation on annual erosion modulus, mean sediment, maximum sediment, mean runoff, maximum runoff, minimum runoff, mean water level, maximum water level and minimum water level in Tianshui watershed, and also analyzed the effect of the variation of forest stand volume on monthly mean runoff, minimum runoff and mean water level. The dynamic models of grey system GM(1, N) were constructed to simulate the changes of these hydrological elements. The dynamic GM models on the impact of stand volumes of different forest types(Chinese fir, masson pine and broad-leaved forests) with different age classes(young, middle-aged, mature and over-mature) and that of precipitation on the hydrological elements were also constructed, and their changes with time were analyzed.
authors.affiliation: Meterology Research Institute of Hunan Province, Changsha 410007.
authors.forename: H
authors.initials: H
authors.lastname: Ouyang
mesh_terms: D011232:Chemical Precipitation; D017753:Ecosystem; D019015:Geologic Sediments; D008954:Models, Biological; D014197:Trees / Q000502:physiology*