河北省土壤有机质时空变化分析

Temporal-spatial Changes of Soil Organic Matter in Hebei Province

采用BP神经网络和地统计方法,对1980~2009年间河北省耕地土壤有机质时空变化规律及影响因素进行对比分析。结果表明：河北省耕地土壤有机质具有西北高东南低的格局;随着时间的推移,有机质总体呈现上升趋势。1980年的低值区域到了2009年SOM上升变化明显,成为热点;北部坝上、西部太行山区及东部沿海地区到2009年SOM含量下降,成为冷点。分析表明,这种变化格局的形成与施用有机肥、实施秸秆还田等社会经济过程有关。本研究为预测有机质变化趋势、改善土壤质量、优化种植结构和耕地的可持续发展提供了一定依据。

In this paper, BP neural network and geostatistical methods were used to analyze temporal and spatial variation of soil organic matter（SOM） and associated factors in cultivated land of Hebei Province during 1980- 2009.The results showed that SOM of farmland was higher in the northwest and lower in the southeast of Hebei Province.Secondly, SOM showed an overall upward trend over time. SOM content significantly increased in the areas with low SOM content from 1980 to 2009, and this area had become a hot spot. SOM content decreased in the dam, Taihang Mountain areas and coastal areas that became a cold spot. This change of SOM was related to the application of organic manure and straw and other socio-economic process. This study would provide a basis for predicting the trend of SOM, improving soil quality, optimizing plant structure and keeping sustainable development of cultivated land.