Effects of Long-term Non-grain Production on Soil Physicochemical Properties of Topsoil in Ningbo Area
To provide a reference for the restoration and utilization of non-grain cultivated land,the effects of long-term non-grain production on soil physicochemical properties of topsoil in Ningbo area were explored deeply.In this study,soil samples were collected from 130 non-grain cultivated land and 53 control plots,and then were systematically analyzed based on geomorphic types(water network plain,coastal plain,hilly area and valley plain)and non-grain planting types(nursery land and orchard).The results showed that:the pH,organic matter content and soil bulk density of non-grain cultivated land were 5.74±0.83,24.72±8.01 g/kg and 1.28±0.05 g/cm3,respectively,significantly lower or higher than that of surrounding paddy fields(6.17±1.02,30.07±10.68 g/kg and 1.18±0.05 g/cm3,respectively)(P＜0.05).Under different terrains,the effects of non-grain production on soil physicochemical properties were different,and the greater effects were found in hilly areas and valley plains.Specifically,there was a decrease of more than 10％ in EC,organic matter and total nitrogen content,and pH value decreased into an acidic level less than pH 5.5.The two non-grain production types of nursery stock and orchard both led to the decrease of pH,EC,CEC,organic matter and total nitrogen content and the increase of soil bulk density,and the former had a greater impact.The organic matter content of nursery stock was 22.90±7.18 g/kg,significantly lower than that of orchard and control plots(30.07±10.68 g/kg and 26.87±8.44 g/kg)(P＜0.05).Our results indicated that the long-term non-grain production in Ningbo resulted in soil acidification,decreased fertility and increased soil compactness,and the restoration and utilization of non-grain cultivated land should fully consider the differences of geomorphic types and non-grain planting types.
Ningbo areanon-grain productionsoil physicochemical propertiesterrainsplanting typesrestoration and utilizationsoil pHorganic matter contentsoil bulk densityelectrical conductivitycation exchange capacitycultivated land managementsoil quality
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