华西雨屏区几种人工植被类型对土壤磷库的影响

【目的】了解华西雨屏区不同人工植被类型土壤磷库特征,分析人工植被类型对土壤磷库及其有效性的影响。【方法】选取华西雨屏区7种典型人工植被类型:橘树(Glycosmis cochinchinensis)迹地、橘树林地、巨桉(Eucalyptusgrandis)林地、玉米(Zea mays)地、香樟(Cinnamonum camphora)林地、柚子(Citrus maxima)林地和桃树(Prunus persica)林地,于2010年7月分别采集土壤根层或耕作层与根下层或犁底层原状土样,分析其磷库及有效磷特征。【结果】华西雨屏区几种典型人工植被类型显著影响了不同土壤层次磷库特征,但不同人工植被类型的影响方式和程度并不一致。玉米地和巨桉林地植被类型下根下层或犁底层土壤全磷库大于根层或耕作层;橘子林地具有最大的根层土壤磷库,而玉米地具有最大的犁底层土壤磷库;尽管玉米地具有较高的根层土壤有效磷含量,但香樟林地根下层土壤有效磷含量最高。【结论】植物生长和人为管理差异是显著影响人工植被土壤磷库及其有效性的重要原因,这为区域土地利用结构调整和生态环境建设提供了理论依据。

Effects of Planted Vegetations on Soil Phosphorus Pool in the Rainy Area of West China

【Objective】 We aimed to understand the characters of soil Phosphorus(P) pool under several planted vegetations in the Rainy Area of West China,and to analyze the effects of planted vegetations on soil P pool and its availability.【Method】 Seven representative vegetations were selected including orange cut-over plantation,orange plantation,eucalyptus plantation,corn farmland,camphor plantation,grapefruit plantation and peach plantation.Soils were sampled in the plough layer or root layer and plough pan or under-root layer in July 2010.Soil P content and available P content were analyzed and soil P pool was calculated.【Results】 Significant effects of planted vegetation were observed on soil P pool,but the effects were different under different vegetations.Soil P pools were higher in plough pan or under-root layer than in plough layer or root layer under eucalyptus plantation and corn farmland.Compared with other vegetations,orange plantation showed the highest soil P pool in root layer,but corn farmland displayed the highest one in plough pan.In addition,although corn farmland had higher soil available P content in plough layer,camphor plantation had the highest soil available P content in under-root layer.【Conclusion】 The results were suggested that the variations in plant growth and human management might be two key reasons influencing soil P characters in different plantations,which can provide some efficient data for regional land use and environment construction.