湟水中上游封山育林效果研究

Effect of Mountain Closure for Forest Regeneration along the Upper Reach of Huangshui River

在青海省湟中县,采取固定样地、随机采样、常规测定等方法,研究了湟水中上游封山育林效果。结果表明,封育在优势种树种种类数量、种群密度、生物量、盖度、植株高度等方面改善了灌木林和疏林地群落结构;降低了灌木林、疏林地土壤容重,增加了土壤孔隙度,且随封育年现增加,效果更加明显;提高了灌木林地有机质、速效N、速效K含量,降低速效P含量,提升了疏林地有机质、速效N含量,降低速效P、速效K含量。封育是改善湟水中上游退化灌木林、疏林地群落结构和土壤结构与养分状况的有效途径。

Effect of mountain closure for regeneration was studied using fixed plot,random sampling and conventional measurement.The result showed that the quantity of dominant species,population density,biomass,coverage and plant height were improved;with the time going on,the soil bulk density decreased in sparse forest and shrubs and soil porosity increased.Organic matter,available N,available K and available P were greatly increased.Mountain closure improved the structure and forest and shrubs,and soil structure along the upper reach of Huangshui River.