渭河两岸缓冲带的土壤有机质含量分布特征及其影响因子

发布时间：2019-03-05 12:46

【摘要】：选取陕西省内渭河沿岸南北3 000 m缓冲区为研究区,利用野外调研、室内实验处理并应用GIS、ENVI、SPSS等软件,分析了土壤有机质的空间分布特征及影响因子,为渭河沿岸生态环境治理与修复提供理论依据。结果表明:渭河沿岸土壤有机质平均含量范围6.3~22.5 g/kg,有机质含量较低。渭河沿岸缓冲带区内南北两岸土壤有机质含量在1 000 m范围内随着距离的增加而增加,1 000 m范围外随距离增加而减少或基本不变;渭河沿岸的土壤有机质平均含量上游最高,下游次之,中游最低。土壤有机质的影响因子有地形因子(高程、坡度)、植被覆盖度和土壤质地。其中土壤有机质与高程、植被覆盖度(NDVI)和土壤颗粒中粉砂百分含量呈正相关,特别是高程因子与土壤有机质表现为显著相关;而土壤有机质与坡度、土壤颗粒中砂粒百分含量呈负相关。
[Abstract]:Taking the 3 000 m buffer zone along the Neiwei River in Shaanxi Province as the study area, the spatial distribution characteristics and influencing factors of soil organic matter were analyzed by field investigation, laboratory experiment and GIS,ENVI,SPSS software. It provides a theoretical basis for the ecological environment treatment and restoration along the Weihe River. The results showed that the average content of organic matter in the soil along the Weihe River was 6.3 ~ 22.5 g / kg and the content of organic matter was lower. In the buffer zone along the Weihe River, the content of soil organic matter in the north and south sides of the Weihe River increased with the increase of distance within the range of 1 000 m, and decreased or remained unchanged outside the range of 1 000 m. The average content of soil organic matter along the Weihe River was the highest in the upper reaches, the second in the lower reaches and the lowest in the middle reaches. The influencing factors of soil organic matter include topographic factors (elevation, slope), vegetation coverage and soil texture. Soil organic matter was positively correlated with elevation, vegetation coverage (NDVI) and silt content in soil particles, especially elevation factor was significantly correlated with soil organic matter. There was a negative correlation between soil organic matter and slope and the percentage content of sand grains in soil particles.
【作者单位】：陕西师范大学旅游与环境学院;地理学国家级实验教学示范中心(陕西师范大学);
【基金】：国家科技支撑计划项目(2012BAC08B07) 国家人力资源和社会保障部留学人员科技活动项目择优资助项目陕西师范大学中央高校基本科研业务费科研发展专项(GK201505112)资助
【分类号】：S153.6

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