滦河流域土壤有机质的空间分布特征分析

Analysis on Spatial Distribution Characteristics of Soil Organic Matter in Luanhe River Basin

对滦河流域72个样点的采样数据统计分析表明,土壤有机质含量的空间分布表现出明显的地域性特征。海拔50m以下的冲积平原和滨海平原地区土壤有机质含量平均为17.64 g/kg;滦河山区向下游平原的过渡地区有机质含量较低,仅为11.06 g/kg;滦河山区有机质含量较高,为21.21 g/kg,而滦河上游蒙古高原地区最低,平均含量只有10.76 g/kg;在滦河上游有森林分布地区出现一个高值区,土壤有机质的平均含量达到36.57 g/kg。全流域土壤有机质含量平均值为19.62 g/kg,低于全国平均水平。土壤有机质的空间分布与气候、植被、生物、土壤性状、地形条件以及人类活动等因素有关。

According to the statistical analysis of the data from 72 soil samples in Luanhe River basin,the spatial distribution of soil organic matter（SOM） content showed an obvious regional difference.The average content of SOM was 17.64 g/kg in the alluvial and coastal plain region with a altitude under 50 m.In the transitional region from the mountain area to the downstream plain,this value was lower of 11.06 g/kg.The content of SOM was higher in the mountain area with an average value of 21.21 g/kg.The lowest value of SOM content appeared in the inner mongolia plateau of the upstream area,it was just 10.76 g/kg while a high value appeared in the upstream region with forest,and SOM content reached to 36.57 g/kg on average.The average SOM content of the whole basin was around 19.62 g/kg which was lower than the national level.The spatial distribution characteristics of soil organic matter had been attributed to a variety of factors including climate,vegetation,biological factor,soil properties,terrain condition,and human activities.