Comprehensive Evaluation of Urban Greening Soil Fertility in Southwest Zhejiang:A Case Study of Liandu District,Lishui
Southwest Zhejiang is dominated by mountainous areas,and red and yellow soils are the main traits.In order to understand the soil fertility status in the construction of beautiful forest formations in this area,this paper took the urban greening soil of Liandu District of Lishui as the research object,and analyzed and evalu-ated the comprehensive fertility status,discussing the quality characteristics of regional greening soil fertility and providing a basis for scientific guidance on greening soil improvement and fertilizer cultivation.The results showed that the average soil volume weight was 1.38 g·cm-3,ranging from 0.90 to 1.70 g·cm-3.The average soil pH was 6.71 and ranged from 5.27 to 7.86.The average soil organic matter was 21.74 g·kg-1,and the average contents of available nutrients in soil,including alkaline nitrogen,available phosphorus and available potassium were 54.73 mg·kg-1,22.53 mg·kg-1 and 151.85 mg·kg-1 respectively.The alkaline nitrogen content was low,and only 65.63%of the soil samples met the quality standards of greening soil.The modified Nemero method was selected to comprehensively evaluate the quality of soil fertility.The medium grade was the largest,accounting for 75%.The poor grade accounted for 18.75%,and the good grade only accounted for 6.25%.When the compre-hensive index variation coefficient of soil fertility quality among sample points is large,the spatial difference is strong.The results of the comprehensive evaluation of greening soil fertility in Liandu District of Lishui showed that it was necessary to increase the application of organic fertilizers to improve the physicochemical properties of the soil and increase the contents of available nutrients such as nitrogen,phosphorus and potassium.
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