河南省典型造林困难地土壤质量评价OA北大核心CSTPCD

[Objective]This study aims to accurately assess the impact of artificial reforestation on soil quality in areas with difficulties in afforestation,and provide a theoretical foundation for monitoring and enhancing soil quality in such regions.[Method]Taking the soil of rocky mountain area in Yunmeng Mountain,Luoyang City as the research object,soil samples from 0-10 cm,10-20 cm,and 20-30 cm soil layers were collected respectively,and 11 soil physical and chemical indicators were measured as the full dataset.The minimal dataset was selected using principal component analysis,and a soil quali-ty index was constructed to evaluate the soil quality in the research area.[Result]1)The total nitrogen and carbon content of the soil in the research area is extremely low,with average values of 0.31 and 2.61 mg·g-1 respectively;2)The minimal dataset indicators for soil quality in the Yunmeng Moun-tain area include:soil pH,urease content,carbon-to-nitrogen ratio,and total porosity.The minimal dataset soil quality index ranges from 0.037 to 0.604,with an average value of 0.322.The soil quality index for most plots decreases as soil depth increases,with the index for the 0-10 cm layer significantly higher than that of other layers.The indices for the 10-20 and 20-30 cm layers are relatively similar;3)The soil quality index of the minimal dataset has a significantly positive correlation with that of the full dataset,and the linear regression fit between the two is quite good(R2=0.63),indicating that the minimal dataset constructed this time can reflect the soil quality condition of the research area well.[Conclusion]According to the soil quality grading standards,the overall soil quality of the artificial forest land in Yunmeng Mountain is at a medium to low level,and it decreases significantly with the in-crease of soil depth.Therefore,improvement of deep soil quality is the key for vegetation restoration and reconstruction in these areas in the future.