论文部分内容阅读
为了解长江三角洲地区农用地土壤肥力特征,以常州市金坛区朱林镇为例,利用模糊综合评价模型与地统计学及GIS技术相结合的方法,分析朱林镇的土壤肥力特征并对其进行综合评价。结果表明:pH为中性,有机质、全氮、阳离子交换量适中,速效钾含量较低,有效磷含量丰富;除有效磷具有中等程度的空间相关性外其他肥力指标均具有强烈的空间相关性;Kriging插值结果显示的各土壤肥力指标空间分布图能够很好的反映肥力指标的空间分布及丰缺状况;模糊综合评价结果表明朱林镇整体肥力处于中等水平,且东部肥力高于西部,南部肥力达到一等水平,与土壤质地、土地经营方式、肥力科学管理及境内地势多为圩田有关。其结果可为镇域尺度土壤肥力的空间内插、制图和取样设计提供参考,也为长江三角洲土壤可持续利用、肥力的科学管理提供依据。
In order to understand the characteristics of soil fertility in agricultural land in the Yangtze River Delta, taking ZhuLin town in Jintan district of ChangZhou as an example, the characteristics of soil fertility in ZhuLin town were analyzed and analyzed by using fuzzy comprehensive evaluation model and geostatistics and GIS techniques Overview. The results showed that: pH was neutral, organic matter, total nitrogen, moderate cation exchange capacity, low available potassium, and abundant available phosphorus; all other fertility indices had a strong spatial correlation except for available phosphorus with moderate degree of spatial correlation . The spatial distribution of soil fertility index displayed by Kriging interpolation can well reflect the spatial distribution and abundance and deficiency of fertility index. The results of fuzzy comprehensive evaluation showed that the overall fertility of Zhulin was at medium level, and the fertility in the east was higher than that in the west and southern To achieve first-class level, and soil texture, land management, scientific management of fertility and the terrain mostly polders. The results can provide reference for spatial interpolation, mapping and sampling design of soil fertility at the town scale, and provide the basis for the scientific management of soil sustainable utilization and fertility in the Yangtze River Delta.