广州绿地土壤理化特性及其相关性

Soil physico-chemical properties and their correlations in a greenbelt in Guangzhou

以广州市荔湾区城市绿地为起点往东北延伸至从化流溪河自然保护区,建立长100km、宽10km的绿地土壤样带以研究广州市绿地土壤理化性状及土壤因子间的相关性。研究结果表明,广州绿地土壤容重平均值为(1.31±0.20)g·cm-3,属偏紧范围;自然含水量为112.14～402.33g·kg-1;总孔隙度均值(44.10%±4.84%),属过紧实(45.3%～41.5%)。土壤pH值为2.21～7.82,变幅较广;有机质属丰富偏下水平(30～40g·kg-1);有效磷、有效钙和重金属的变化范围也较广。土壤砂粒质量分数与绝大多数土壤物理因子呈极显著负相关(P<0.01),土壤pH值与重金属总铬、总镉、总铅、有效铜、有效钙和有效钾等呈极显著正相关(P<0.01)。研究结果为科学使用和保护城市绿地土壤提供依据。

This study is based on data sampled from a transect of 100 km long and 10 km wide from Liwan District of Guangzhou,going northeast and extending to Conghua Hotspring Nature Reserve.Soil physico-chemical properties and the correlations between soil factors were analyzed.The results show the mean value of soil bulk density is（1.31±0.20） g·cm^-3,which reflects soil compaction.The natural water content is 112.14-402.33 g·kg^-1.Mean value of total porosity is（44.10%±4.84%）,indicating a more hardening soil（45.3%-41.5%）.pH value is 2.21-7.82,which changes from acidity to neutral or alkaline.Soil organic material is leaning rich（30-40 g·kg^-1）.Available phosphorus,available Calcium and heavy metals changes widely.The composition of sand have an extremely obvious negative correlation with most soil physical properties（P〈0.01）.The soil pH value have an extremely obvious negative correlation with total lead,total Chromium,total Cadmium,available copper,available Calcium,available Potassium（P 〈0.01）.The findings of this study have implications for providing basic information and technical support for scientifically using and managing urban soil.