坡地植烟土壤速效养分空间分析

Spatial Analysis of Available Nutrients in Tobacco-planting Slope Soil

为进一步提高坡地烟田管理水平、改善烟叶品质,在重庆市彭水县烟草科技示范园开展了区域化研究,分析典型山地特色烟坡地植烟土壤速效养分空间变异及分布特征。结果表明:研究区域为典型的低磷高钾土壤,OM与AN含量较为适宜,土壤偏酸性,代换性锰离子含量略高;其中AN、AK、OM、Cu空间变异性为中等变异,AP和有效Fe、Mn、Zn为强变异,AP变异系数高达35.49%,而AK的变异较小为17.65%;受山地特色烟区坡地植烟土壤母质、地形等因素影响,AP、AK、Mn、Cu、Zn均具有强烈的空间相关性;AP、AK决定系数分别为0.362、0.404,模型的拟合度均较低,空间变异结构差,以小块状变异为主,空间自相关距也均较小;碱解氮和有机质具有明显的空间变异结构,呈现区域化、规律性及一致性;Fe、Mn、Cu、Zn含量与pH均有沿坡向渐变分布规律。Kriging插值图更为直观地呈现出坡地植烟土壤速效养分的空间分布特征。

In order to further improve the management of tobacco field slope and the quality of tobacco,the regional study was carried out in Chongqing Pengshui Tobacco Science and Technology Demonstration Park.Typical characteristics of mountain slopes planting tobacco spatial variability of soil available nutrients and distribution characteristics was studied.The results showed that available phosphorus of the soil of study area was at the lower levels,available potassium and substitution of manganese were at the higher levels,OM and AN was appropriate,and soil was acidic.The spatial variability of AN,AK,OM,Cu were medium,AP,Fe, Mn and Zn were strong variation,c.v.%of AP was 35.49,and c.v % of AK was 17.65.As tobacco-growing areas were affected by mountain slopes tobacco planting soil parent material,topography and other factors,in which AP,AK,Mn,Cu and Zn had strong spatial correlation.Determination coefficients of AP and AK were 0.362 and 0.404.The goodness of model was low,the spatial variation structure was poor,the spatial correlation was small-block variation,the spatial autocorrelation was smaller,spatial variability structure of AN and OM was significant,and showed regionalization,regularity and consistency.The content of available Fe,Mn,Cu,Zn and pH showed certain regularity with the slope.The spatial distribution of tobacco soil nutrients of slopes was intuitively characterized by Kriging inter-polation.