粤北地区针阔混交林土壤TP含量分布特征

Distribution Characteristics of Soil TP Content in Coniferous and Broad-leaved Mixed Forests in Northern Guangdong

以粤北地区的清远市针阔混交林土壤为研究对象,野外采集129个样点土壤(0~80 cm),运用酸溶-钼锑抗比色法来检测全磷(TP)含量,结合运用Arc GIS技术与统计分析等方法,探究清远市针阔混交林土壤TP的空间分布格局。结果表明:针阔混交林土壤D1层TP含量为107.13~967.67 mg/kg,平均值为324.81 mg/kg;D2层TP含量为76.87~917.67 mg/kg,平均值为316.18 mg/kg;D3层TP含量为79.53~922.00 mg/kg,平均值为313.37 mg/kg;D4层TP含量为70.83~937.33 mg/kg,平均值为307.34 mg/kg。在垂直空间分布上D1层TP含量最高,随着土壤深度的增加,TP含量呈现逐渐下降的趋势。针阔混交林各层土壤TP含量的高值区主要位于中部以及东部小部分区域,北部、南部的TP含量最低。水平空间上,针阔混交林土壤TP含量呈自东向西横向沿线高,南、北两端偏低的分布特征,表现出明显的空间异质性。

This paper takes the soil of coniferous and broad-leaved mixed forests in Qingyuan city of northern Guangdong as the research object.The soil of 129 sampling points(0-80 cm)were collected in the field,and the total phosphorus(TP)content was detected by acid-soluble-molybdenum antimony anti-colorimetry.Combined Arc GIS technology with statistical analysis,the spatial distribution pattern of soil TP in the coniferous and broad-leaved mixed forests in Qingyuan city was explored.The results showed that the content of TP in the soil D1 layer of coniferous and broad-leaved mixed forests in Qingyuan city was 107.13-967.67 mg/kg,with an average of 324.81 mg/kg.TP content in D2 layer was 76.87-917.67 mg/kg,with an average of 316.18 mg/kg.TP content in D3 layer was 79.53-922.00 mg/kg,with an average of 313.37 mg/kg.The TP content in D4 layer was 70.83-937.33 mg/kg,with an average of 307.34 mg/kg.The TP content in the D1 layer was the highest in vertical spatial distribution,and the TP content showed a gradual decrease with the increase of soil depth.The high-value areas of soil TP content in each layer of coniferous and broad-leaved mixed forests in Qingyuan city were mainly located in the middle and small parts of the eastern part of the study area,and the TP content in the north and south was the lowest.In horizontal space,the soil TP content of coniferous and broad mixed forests was high along the transverse line from east to west,and the distribution characteristics were low at the south and north ends,showing obvious spatial heterogeneity.