设施农业土壤大量和微量元素等级评价与空间变异特征研究

Study on Grade Evaluation and Spatial Variability of Soil Macro Elements and Trace Elements in Facility Agriculture

采用GPS定位取土与实验室测定及地理制图等方法,分析了某产业园区设施农业土壤有机质、全氮、碱解氮、有效磷、速效钾等大量元素和总硼、总锰、总钼、总硒等微量元素描述性统计特征,进行了等级评价,并阐述了其空间变异特征。结果表明:(1)园区设施农业土壤有机质、全氮、碱解氮、有效磷、速效钾平均值分别为39.4g/kg、1.05g/kg、90.6mg/kg、56.0mg/kg、107.7mg/kg,皆为中等变异强度,其中有机质变异强度最小,有效磷则最大;总硼、总锰、总钼、总硒平均值分别为24.1mg/kg、271.2mg/kg、0.30mg/kg、0.30mg/kg,其中总硼、总锰为弱变异,总钼、总硒为中等变异。(2)土壤有机质、有效磷含量较丰富,全氮、碱解氮、速效钾偏缺。总硒含量高于土壤环境背景值,总硼、总锰、总钼含量均低于背景值。(3)南部区域土壤有机质、全氮、碱解氮、有效磷、速效钾含量普遍高于北部,总硼、总锰高值区主要集中在南部区域,总钼、总硒高值区则位于北部。

The paper adopted methods such as GPS positioning,laboratory measurement and geographic mapping to analyzed the contents of macro elements such as organic matter(OM),total nitrogen(TN),alkali-hydrolysable nitrogen(AHN),available phosphorous(AP),available potassium(AK)and trace elements such as total boron,total manganese,total molybdenum and total selenium of facility agriculture soil in industrial park.The paper also analyzed its spatial variability characteristics and graded their evaluations.Results were as follows:(1)The average content of OM was 39.4 g/kg,TN 1.05 g/kg,AHN 90.6 mg/kg,AP 56.0 mg/kg,and AK 107.7 mg/kg,all of which were moderately variable in intensity.The variation intensity of OM was the smallest and the AP was the largest.The average values of total boron,total manganese,total molybdenum and total selenium were 24.1 mg/kg,271.2 mg/kg,0.30 mg/kg,and 0.30 mg/kg respectively.Total boron and total manganese were weak variations,total molybdenum and total selenium were medium varia?tion.(2)The content of OM and AP were abundant,and TN,AHN and AK were lacking.The total selenium content was higher than the background value of the soil environment,and the total boron,total manganese and total molybdenum content were much smaller than the background value.(3)The content of OM,TN,AHN,AP and AK in the southern region soil was generally higher than that in the north.The total values of total boron and total manganese were mainly concentrated in the southern region while the total molybdenum and total selenium were located in the north.