The Influence of Climate, Soil Properties and Vegetation on Soil Nitrogen in Sloping Farmland

Soil nitrogen in farmland ecosystems is affected by climate, soil physical and chemical properties planting activities. To clarify the effects of these factors on sloping quantitatively, distribution total (TN) content, nitrate (NO3-N) content ammonium (NH4-N) at depth 0–100 cm 11 profiles Luanhe River Basin were analyzed. Meanwhile, properties, climatic NDVI (Normalized Difference Vegetation Index) used to construct a structural equation which reflected influence mechanism environmental concentration. The results showed that TN NO3-N decreased with increase Basin, while variation NH4-N was not obvious. organic carbon (SOC) pH, area average particle size (SMD) NDVI6 (NDVI June) explained 77.4%. SOC most important factor contributing content. NDVI5 May), annual precipitation (MAP), pH 49.1% Among all factors, only NDVI8 August) had significant correlation change 24.2%. ecosystem mainly natural such as parent material climate.