淮北平原农田土壤养分空间变异特征——以安徽省蒙城县为例

发布时间：2018-05-09 03:11

本文选题：土壤养分 + 地统计学　；参考：《土壤通报》2016年03期

【摘要】：以安徽省淮北平原的蒙城县为例,利用测土配方施肥获取796个农田表层样点数据(0~20 cm),运用地统计学方法研究了土壤有机质(SOM)、全氮(TN)、速效磷(AP)和速效钾(AK)含量的空间变异特征及其影响因素。结果表明,蒙城县SOM含量为17.14±2.70 g kg~(-1),TN含量为0.85±0.14 g kg~(-1),AP含量为16.63±9.66 mg kg~(-1),AK含量为129.63±35.24 mg kg~(-1),属中等水平。变异系数介于15.75%~58.09%,属中等变异强度。地统计分析表明,蒙城县土壤养分的变异函数符合指数模型,具有中等强度的空间自相关性。SOM和TN的空间自相关性稍强,AP和AK的空间自相关性稍弱。土壤养分在空间上呈块状分布,SOM、TN和AK的空间分布总体上北高南低、在东南—西北方向上变异较强,在西南—东北方向上变异较弱。AP含量总体上由北到南,先降低再升高。
[Abstract]:Take Mengcheng County in Huaibei Plain of Anhui Province as an example, The data of 796 topsoil samples were obtained by using soil test formula fertilization. The spatial variation characteristics and influencing factors of soil organic matter (SOM), total nitrogen (TNN), available phosphorus (AP) and available potassium (K) were studied by using geostatistics method. The results showed that the content of SOM was 17.14 卤2.70g / kg, the content of TN was 0.85 卤0.14g / kg, the content of AP was 16.63 卤9.66mg / kg, the content of AK was 129.63 卤35.24mg / kg / kg ~ (-1). The coefficient of variation was between 15.75 and 58.09, which was of moderate variation intensity. The geostatistical analysis showed that the variation function of soil nutrients in Mengcheng County was in accordance with the exponential model, and the spatial autocorrelation between SOM and TN was slightly stronger than that of AP and AK with moderate intensity. The spatial distribution of soil nutrients was as follows: the spatial distribution of SOMTN and AK was generally high in the north, low in the south, strong in the southeast to northwest, and weak in the southwest to northeast, and the content of AP decreased first and then increased in the whole from north to south.
【作者单位】：安徽理工大学测绘学院;中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室;安徽省蒙城县土壤肥料工作站;
【基金】：国家自然科学基金(41501226) 安徽省高校自然科学研究项目(KJ2015A034) 土壤与农业可持续发展国家重点实验室开放基金项目(Y412201431) 安徽理工大学人才引进项目(ZY020)资助
【分类号】：S158

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