关键词: 柠条锦鸡儿, 柠条锦鸡儿, 林龄, 土壤有效磷

Abstract: Physical properties of soil in urban green spaces (UGS) have great influence on ecosystem functions. To study physical properties of different soil levels of green spaces, soil samples in Xi’an Botanic Garden were collected, six indexes were chosen, including bulk density, total porosity, capillary porosity, non- capillary porosity, water holding capacity and soil moisture content, Q value of soil samples were evaluated with fuzzy mathematical method, SPSS17.0 and Excel. The results showed that Q values of soil samples of topsoil (0-25 cm), surface soil (25-50 cm), middle soil (50-70 cm) and deep soil (70-90 cm) were 21.69, 61.24, 71.19, 66.89, which indicated that they were in extremely low level, lower level, good level and lower level, respectively. The average Q value was 55.25, which indicated that the soil was in lower level. The reason of low Q value in topsoil and surface soil was that the soil was repeatedly rolled by heavy machinery during the construction. The effect on middle soil was lower. The Q value of deep soil was lower than that of middle soil along with the increase of soil depth. The comparison of the weight of the indexes showed that bulk density was the main index affecting the physical property. The bulk density decreased with the increase of soil depth. However, the weight of natural water content increased with the increase of soil depth.