Assessment of primary soil fertility indicators of different forest stand types in the Nanshan forest farm in Jiyuan City
Soil fertility is a significant indicator that measures the ability of soil to provide various nutrients required by vegetation and reflects the crop producing power of soil.To ascertain the soil fertility of different forest stand types in the Nanshan forest farm of Jiyuan City,this study investigated the soil of four forest stand types:Platycladus orientalis,Robinia pseudoacacia,Quercus variabilis,and walnut trees.It analyzed the soil nutrients of the forest stand types by determining the pH,organic matter,total nutrients(TN,TP,TK),and available nutrients(AN,AP,AK)of soil at different depths(0～40 cm).Moreover,it assessed the comprehensive soil fer-tility using the improved Nemerow comprehensive index method.The results show that:(1)Except pH,the physicochemical factors of the soil of the forest stand types in the study area exhibited moderate variations,and the soil TP,TK,AP,AK,and pH manifested significant differences;(2)With an increase in soil depth,the soil in the study area showed increased pH and bulk density,decreased organic matter,TN,and available nutrients,and almost unchanged TP and TK;(3)The assessment of soil nutrient abundance indica-ted that the TN,TP,and available nutrients were relatively poor in the soil of the study area;(4)Based on a comprehensive assess-ment,the soil fertility of four forest stand types at different depths decreased in the order of Robinia pseudoacacia,Quercus variabilis,Platycladus orientalis,and walnut trees.Their soil fertility was generally at an average level,with low values observed at depths ran-ging from 20 to 40 cm.The comprehensive analysis indicates that TN,TP,and available nutrients are deficient in the study area.Therefore,applying appropriate organic fertilizers,nitrogen,and phosphorus is recommended for the study area.
Nanshan forest farmforest stand typesoil nutrientsoil fertility
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