入侵物种紫茎泽兰对桉树人工林土壤氮素的影响

Efects of Eupatorium adenophorumInvasion on Eucalyptus Plantation soil Nitrogen

分析了不同分布区域及密度紫茎泽兰对桉树林土壤全氮、水解氮含量的影响。结果表明：（1）阴坡样地的全氮和水解氮含量均高于阳坡样地，且阳、阴坡样地中未入侵区全氮和水解氮含量均高于其它3个区；（2）在不同入侵程度的同一土层下阳、阴坡样地全氮、扮解氮含量在表层土I层或I～Ⅱ层均表现为：低密度区〉中密度区〉高密度区〉未入侵区；（3）在Ⅲ～V层（土层30cm）左右阳、阴坡样地的全氮和水解氮含量均为：高密度区〉低密度区，其余土层低密度区全氮和水解氮含量最高；（4）随着土层的加深3个区与未入侵区全氮和水解氮含量相比是有所不同的，且无明显规律性。

This paper analyzes that effects on the different degree of invasion of Eupatorium adenophorum on Eucalypt soil TN and HN content. The results showed that： （1）From the overall situation, slope to theTN and HN content were higher than sunny plot, and sunny,slope plots of the no invaded area TN and HN content were higher than the other three areas. （2） Under the same soil in different degrees of invasion, sunny,slope plots of TN and HN content in the surface soil of the I layer or I ~ ]l layer： low density area：〉medium density area：~high density area：〉no invaded area; （3）In Ⅲ-Ⅴ layer （layer 30cm） around , sunny,slope plots of TN and HN content： high density area：〉low density area, the remaining soil layer low density area of TN and HN content was the highest. （4） With the soil layer increasing, 3 areas and no in invaded area compared to TN and HN content is different, and no obvious regularity