基于多尺度EGLSN地理空间的区域施肥方法研究--以山西省为例

传统的测土配方施肥是根据土壤试验数据与土壤养分空间变异情况在一定的区间内给出区域施肥量,不同的空间尺度下环境因素对施肥区间分布有着不同程度的影响。为了揭示地理空间范围对施肥区间的影响规律,以地处黄土高原的山西省为研究区,借鉴景观生态学"尺度-过程"原理,利用统计方法建立生态气候、地貌景观、利用措施、土壤条件、养分管理(EGLSN)五个地理空间尺度。通过在研究区设置了Z1~Z5五个样区地理空间,统计各尺度地理空间内土壤调查点上产量分布信息,以养分变化与平衡模型计算施肥区间。同时开发了多尺度区域施肥系统,可在任意不同尺度地理空间上计算该区域的施肥区间,与各样区所在或临近县域审定配方比较表明:多尺度施肥区间基本涵盖了当地审定配方的区间,该方法可对不同尺度地理空间的施肥管理与规划提供定量化依据。

Regional fertilization methods based on the EGLSN geospatial Scales

Soil testing and nutrient spatial variation were applied in traditional soil testing and fertilization recommendation to calculate regional fertilizer. The environmental factors had different effects on the fertilization interval under different geospatial scale. In order to reveal the influence of geospatial range on fertilization interval, this study takes Shanxi Province as the research area in the Loess Plateau. Scale-process principal presented by landscape ecology and statistical method were used to establish five geospatial scales: eco-climate, geomorphologic landscape, land use measures, soil condition and nutrient management (EGLSN) . In the study area, the distribution information of the productivity in the soil survey points in each scale was selected to determine the fertilization interval by using the model of the nutrient change and the balance in typical sampling zones from Z1 to Z5 . The unified platform of multiple scale regional fertilization system was developed to count the fertilization interval in real time. Compared with the different typical zones on each scale, it shows that the approval interval is basically covered by the multiple scale fertilization intervals. Base on the platform, it can quickly calculate the fertilization interval in different scale geospatial and provide the reference to the multiple scale regional fertilization and cultivated land management.