不同密度大叶相思幼林的土壤肥力  

Soil Fertility of Young Acacia auriculiformis Stands with Different Densities

作　　者：许松葵[1] 王相娥[2] 谢腾芳[2] 曾锋[1] 黄丽铭[2] 

机构地区：[1]广东省林业局生态公益林中心,广东广州510173 [2]华南农业大学林学院,广东广州510642

出　　处：《华南农业大学学报》2008年第2期79-81,共3页Journal of South China Agricultural University

基　　金：广东省林业局资助项目(4400-02084,4400-07041)

摘　　要：用环刀法测定不同密度的大叶相思幼林的土壤容重、毛管孔隙度、非毛管孔隙度、毛管持水量等物理性质,又以常规方法测定了其土壤化学性质.结果显示:各密度幼林的地径、树高、冠幅分别比一年前增加了1.5 cm、1.3 m和0.9 m以上;高密度幼林的地径、树高、冠幅生长快于中密度和低密度幼林;各密度幼林的土壤容重下降,毛管孔隙度增加;低密度和中密度幼林对土壤理化性质的改良作用优于高密度幼林;与一年前相比,高密度幼林的土壤有机质、有效N、有效P、有效K含量有所降低,交换性Ca和交换性Mg的含量有所增加,中密度幼林的土壤有机质和各种土壤养分含量均有大幅增加;低密度幼林的有效P略有增加,有机质和其他土壤养分含量大幅增加.Growth and soil physicochemical properties of Acacia auriculiformis stands with different densities were studied. Ring knife method was used to study soil physical characteristics, such as soil bulk density, soil capillary porosity, non-capillary porosity, soil maximum water. Other soil physicochemical properties were determined using standard methods. For stands of different density, the net increments of ground diameter, tree height and crown width were 1.5 cm, 1.3 m and 0. 9 m, respectively, greater than the control. The net increments of ground diameter, tree height and crown width of high-density stand were greater than those of medium-and low-density stands. Compared with the control, soil organic matter, available N, available P and available K in the high-density stand decreased, and its exchangeable Ca and Mg increased, whereas soil organic matter and all nutrients in the medium-density stand increased substantially, and available P in the low-density stand increased slightly and soil organic matter and other nutrients increased substantially.

关 键 词：密度 大叶相思 生长 土壤肥力 

分 类 号：S158.3[农业科学—土壤学]