人为活动对贵州西部野八角灌丛土壤主要养分的影响研究

The effect of human activities on the main nutrients in the soil of Illicium simonsii shrubs in western Guizhou

对贵州西部野八角灌丛区不同人类活动干扰与恢复程度的五种不同土地类型分别设置典型样地,随机采集土壤样品进行测定,分析人为活动对土壤pH值和主要养分的影响。结果表明:随着破坏程度的增大,土壤pH值有减小的趋势,土壤pH值从高到低的顺序是:草地(5.94)>弃耕地(5.78)>柳杉林(5.39)>柳杉-野八角灌丛交错带(4.74)>野八角灌丛(4.68);土壤有机碳含量随破坏程度的增大呈下降趋势,从高到低的顺序是:野八角灌丛(9.59%)>柳杉-野八角灌丛交错带(7.68%)>柳杉林(4.33%)>弃耕地(3.46%)>草地(3.03%);野八角灌丛破坏对全氮含量有一定程度的影响,多重比较的结果表明全氮含量的差异主要存在于野八角灌丛(0.29%)与弃耕地(0.14%)和草地(0.10%)之间;全磷含量以柳杉林最高(0.16%),表明营造柳杉林对于全磷含量有一定的恢复作用。

Five sample plots were set up in five different land types with different disturbance and restoration degree of human activities in the Illicium simonsii shrub area of Western Guizhou.Soil samples were randomly collected for determination,and the effects of human activities on soil pH value and main nutrients are analyzed.The research findings show that the soil acidity tends to decrease with the increase of damage degree.The order of soil acidity from high to low is grassland(5.94)>abandoned cultivated land(5.78)>Cryptomeria fortunei forest(5.39)>Cryptomeria fortunei-Illicium simonsii shrub ecotone(4.74)>Illicium simonsii Shrubs(4.68).The content of soil organic carbon decreased with the increase of damage degree and decreased from high to low.The order to the lowest was:Illicium simonsii Shrubs(9.59%)>Cryptomeria fortunei-Illicium simonsii shrub ecotone(7.68%)>Cryptomeria fortunei forest(4.33%)>abandoned farmland(3.46%)>grassland(3.03%).Destruction of Illicium simonsii Shrubs had a certain effect on total nitrogen content,and the results of multiple comparisons showed that the difference of total nitrogen content mainly existed in Illicium simonsii Shrubs(0.29%).Between abandoned farmland(0.14%)and grassland(0.10%)the total phosphorus content of Cryptomeria fortunei forest was the highest(0.16%),indicating that the construction of Cryptomeria fortunei forest had a certain recovery effect on the total phosphorus content.