低山茶园土壤的氮素空间变异与其颗粒组成的关系

研究低山茶园土壤氮素的空间变异及其与土壤颗粒组成的关系,对提高茶园氮肥利用率,降低氮素损失及茶园土壤管理具有重要意义。结合运用经典统计学和地统计学方法,分析蒙顶山茶园土壤的氮素空间变异与其土壤颗粒组成的相关性。结果表明:①土壤全氮及碱解氮含量具有中等的空间相关性,C0/(C0+C)分别为35·5%和28·5%,自相关距离分别达到了843和1149m,结构性因子是其空间变异的主要影响因子。二者的空间变异方向并不完全相同,但都在东南方向有明显的空间变异,在东北方向的变异较小。②Kriging插值分析说明,土壤全氮和碱解氮均在东北至西南方向呈明显的带状分布,在垂直方向均随海拔高度的升高而增大。③土壤全氮和碱解氮含量与<0·0001mm土壤颗粒呈极显著负相关,与0·0001~0·0005mm粒径土壤颗粒相关不显著,与0·0005~0·01mm粒径土壤颗粒呈显著或极显著正相关。

The Spatial Variability of the Nitrogen and Its Correlation with Particle Components in Hilly Tea Plantation Soils

Studies on the spatial variability of nitrogen and its correlation with particle components in hilly tea plantation soil are important to the improvement of nitrogen utilization ratio and soil management. The methods of classical statistics and geostatistics were applied to analyze the spatial variability of nitrogen and its correlation with particle components in soil of Mengding tea plantation. The results showed: ①The total nitrogen and alkali-hydrolyzable nitrogen content were moderately spatial dependent. The rates of nugget to sill were 35.5% and 28.5%. The spatial autocorrelation ranges of soil total and alkali nitrogen were 843 m and 1149 m. Structural factors were the major factors affecting the spatial variability of the total nitrogen and alkali-hydrolyzable nitrogen content. The anisotropic structures of the total nitrogen and alkali-hydrolyzable nitrogen content were not the same as each other, but both of them had an obvious anisotropic structure in the southeast part and weaker in the northeast part. ②Analysis by the method of Kriging showed that the equivalence of the total nitrogen and alkali-hydrolyzable nitrogen content distributed from northeast to southwest in the aclinic direction of the slope, and increased along with the elevation of altitude in the vertical direction of the slope. ③The total nitrogen and alkali-hydrolyzable nitrogen contents were negatively correlated to the colloid clay (<0.0001 mm), but had not obvious relation to fine clay (0.0001～0.0005 mm), and were positively correlated to skeleton clay, fine silt and medium silt (0.0005～0.01 mm).