黄土高原四种能源灌木林的研究

通过对4种能源灌木林的研究表期:同一树种生长量由于造林密度的增大而减小，而产量则由于造林密度的增大而提高。树种产量高低的顺序是:沙棘、柠条、沙柳、紫穗槐。4种能源灌木树种高密度（1333株/亩）林地的土壤水分高于或相近于中密度（666株/亩）的林地，其中耗水程度高的能源灌木树种为沙棘和紫穗槐，柠条和沙柳较低。从而可为半干旱黄土丘陵区发展和营造能源灌木林选择适宜的造林密度提供科学依据。

THE STUDY ON THE 4 SPECIES OF FUEL SHRUBBERIES OF THE LOESS PLATEAU

4 species fuel shrubberies were studied in this paper, the result shows that as cultural density increased, growth amount decreased for the same species of shrub, And the yield (above ground biomass) rose. The order of 4 species was Common Seabuckthorn, Korshinsk Peashrub, Mongolian Willow and Shrubby Falseindigo from high yield to low yield. The soil-moisture in high density (1333 individuals per mu) shrubland was a little higher than that in middle density (666 individuals per mu) shrubland for 4 species, of which the high water consumption species were Common Seabuckthorn and Shrubby Falseindigo, followed by Korshinsk Peashrub and Mongolian Willow. So the result may provide the scientific basis for choosing proper cultural density in developing and establishing fuel shrubberies in the semi-arid loess hilly area.