菜地旱地交错分布区土壤有机碳和有效态微量元素的空间变异性—以山东寿光古城镇为例

基于GIS和地统计学方法，以山东寿光古城镇为例，分析了两种利用方式下（大棚蔬菜和小麦玉米轮作）表层（020 cm）土壤有机碳的空间变异特征及其影响因素，并分析了土壤有机碳含量与有效态微量元素含量之间的相关性。结果表明，研究区内大棚菜地有机碳平均含量高于小麦玉米轮作农田，两者变异程度均为中等，受施肥、温度、灌溉、翻耕等人为因素的影响显著。菜地耕层土壤有机碳的变程（749 m）小于农田（1460 m），说明菜地有机碳空间变异程度高，这与菜地中施肥管理措施变异度更大有关。轮作区土壤有机碳空间分布模拟结果表明，研究区中部土壤有机碳含量较高，中东部和西部较低。大棚菜地土壤有机碳空间模拟结果表明，土壤有机碳较高值分布于研究区的东北、西北和东南区域，较低值分布在中西部北边位置。小麦玉米轮作农田中有机碳存储量与有效Fe、Cu、B含量呈极显著正相关，与有效Mn呈极显著负相关；菜地土壤有机碳与微量元素有效态之间的相关性不明显。

Spatial variations of soil organic carbon and available microelement contents in interlaced area of vegetable lands and grain lands----A case study in Shouguang City,Shangdong Province

 Taking Shouguang City as an example, the spatial variation characteristics and the influence factors of soil organic carbon (SOC) in the top 0-20 cm soil layer under greenhouse vegetables lands and wheat-maize rotation land were analyzed based on GIS and geostatistics methods, and the correlations between the contents of SOC and  available trace elements were calculated. The result show that the average content of SOC in the greenhouse vegetable fields is higher than that of wheat-maize rotation fields in the studied area and the variations of SOC in the two fields are moderate and significantly influenced by fertilization, temperature, irrigation, tillage, etc. The variation range of SOC in vegetable fields (749 m) is less than that in farmlands (1460 m), indicating that the spatial variation of SOC in vegetable fields correlates stronger to  fertilizer management than in vegetable fields. The simulation results of the SOC are higher in the middle, lower in the middle east and west in the grain fields, higher in the northeast, northwest and southeast, and lower in the northern part of Midwest in vegetable fields. The SOC storage is positively correlated with available Fe, Cu and B contents in the wheat|maize rotation fields and negatively correlated with available Mn, but there is no such a significant correlation in the vegetable fields.