阔叶红松林土壤氮素的空间分布

摘要

The space distribution characteristic of soil nitrogen of broad-leaved Pinus koraiensis forest in Jiaohe was ana-lyzed by using the method of geostatistics.Moreover, spatial distribution maps of the soil available nitrogen and total nitro-gen were made by using kriging difference value.The result showed that the average content of available nitrogen was 0.95 ±0.45 g· L-1 .The average content of soil available nitrogen of A,B and C layer was 1.19 ±0.45 g· L-1 , 0.87 ±0.43 g· L-1 and 0.67 ±0.28 g· L-1 , respectively.The variable coefficient was 0.469, 0.374, 0.481 and 0.424, respective-ly.The average content of total nitrogen was 0.97 ±0.449 g· L-1 .The average content of total nitrogen of A,B and C lay-er was 1.31 ±0.391 g· L-1, 0.87 ±0.345 g· L-1 and 0.58 ±0.253 g· L-1.The variable coefficient was 0.463, 0.298, 0.397 and 0.437.The available nitrogen and total nitrogen content of soil whose fluctuation was larger in horizontal direction presented abnormal distribution.It decreased progressively in vertical direction, A layer>B layer>C layer.%采用地统计学的方法分析了蛟河阔叶红松林土壤氮素的空间分布特征，并利用克里格差值绘制了土壤有效氮和全氮的空间分布图，结果表明：有效氮的平均含量为0．95±0．45 g· L－1，A层土壤有效氮的平均含量为1．19±0．45 g· L－1，B层土壤有效氮的平均含量为0．87±0．43 g· L－1，C层土壤有效氮的平均含量为0．67±0．28 g· L－1，变异系数分别为0．469、0．374、0．481、0．424；全氮的平均含量为0．97±0．449 g· L－1，A层土壤全氮的平均含量为1．31±0.391 g· L－1，B层土壤全氮的平均含量为0．87±0．345 g· L－1，C层土壤全氮的平均含量为0．58±0.253 g· L－1，变异系数分别为0．463、0．298、0．397、0．437。土壤中有效氮和全氮的含量，在水平方向上波动较大，呈非正态分布；在垂直方向上逐层递减，A层＞B层＞C层。