关键词: 巨桉, 林草复合种植模式, 土壤特征, 养分动态, 林分密度

Abstract: The experiment was conducted in three Eucalyptus grandis+grass compound planting patterns which have five different densities.Three patterns were E. grandis+Dactylis glomerata L.(p attern Ⅰ), E. grandis+Festuca arundinacea Schreb.(pattern Ⅱ), E. grandis+Hemarthria compressa (L.f) R.BY.(pattern Ⅲ).Soil characteristics of the compound planting patterns were studied.The primary results show ed as follows:The soil physical properties (bulk density, non-capillary porosity and the total porosity) were improved to a certain degree.The account of soil organic matter had comparable trends among the three patterns and the order of the account of soil organic matter was May > November > August.The order of hydrolysis nitrogen was Augus > May >November.The orders of available P and Kwere May > August > November.The difference of the soil available nutrients among the three compound planting patterns was significant (P<0.05).The forest densities did not show obvious effect, for the research was carried out at the initial stage of E. grandis+grass compound pattern.Integrating with the soil nutrient dynamics and the related research, the model Ⅲ[E. grandis+Hemarthria compressa (L.f) R.BY.]is more appropriate for the district.

Key words: Eucalyptus grandis, forest-grass compound planting pattern, soil characteristics, nutrient dynamics, stand density