米仓山彩叶景观林土壤速效N、P、K含量特征

On Concentration of Available Nitrogen,Phosphorus,and Potassium from Soil of Colorful Leaf Landscape Forests in Mt. Micang

通过土壤剖面取样法对川东北米仓山景区5种彩叶景观林土壤的速效N、P、K含量进行了初步研究。结果表明:速效N、P、K含量在5种彩叶景观林森林土壤剖面上具有明显的层次性,即腐殖质层高于淋溶层;除淋溶层速效K外,速效N、P、K含量分布特征为天然林高于人工林;天然林中,常绿落叶混交林高于针阔混交林。速效N、P、K含量在巴山水青冈林及其混交林中都高于米心水青冈林及混交林。研究揭示森林群落类型可能是影响米仓山彩叶景观林秋季土壤速效N、P、K含量的重要因子。

Concentration characteristics of available nitrogen, phosphorus, and potassium from soil of colorful leaf landscape forests in Mt. Micang are studied hy soil profiles sampling method. The results show that： the content of available nitrogen, phosphorus and potassium of soil profiles in different communities has evident gradients, i.e. it is larger in humus horizon than that in eluvial horizon; except available potassium in eluvial horizon, the content of available nitrogen, phosphorus and potassium both in humus horizon and eluvial horizon shows [ollowing rules： it is larger in soil from natural forest than that from man-made forest~ among nat- ural forests, evergreen and deciduous mixed forest has a higher level than theropencedrymion; Fagus pashanica community and its mixed forest have higher levels than Fagus engleriana forest community and its forest. The study reveals forest community types which might be a key factor affecting available nitrogen, phosphorus, and potassium concentration in colorful leaf landscape forests soil in Mt. Micang.