Arda Bridge

Location:Bulgaria
Area:37,121 acres (15,022 hectares)
Species:All  Endangered  Invasive
Climate:View Climate Data
Land Use:View Land Use Data
Köppen climate classification:Cfa (Climate: warm temperate; Precipitation: fully humid; Temperature: hot summer)
Natura 2000 Data Sheet:View Data Sheet  Explanatory notes

Ecoregions

Balkan mixed forests
Rodope montane mixed forests

Soils

Protected Area Boundary
 A
  
Share50 %20 %10 %10 %5 %5 %
Soil TypeChromic LuvisolsChromic LuvisolsUmbric LeptosolsLithic LeptosolsEutric RegosolsEutric Cambisols
Topsoil TextureMediumMediumMediumMediumMediumMedium
Reference Depth100 cm100 cm30 cm10 cm100 cm100 cm
DrainageModerately wellModerately wellImperfectlyImperfectlyModerately wellModerately well
Available Water Capacity100 m100 m15 mm15 mm100 m100 m
Phase 1StonyStonyStonyStonyStonyStony
Root Obstacle20 - 40 cm20 - 40 cm  None to 80 cmNone to 80 cm
Impermeable LayerNone to 150 cmNone to 150 cm  None to 150 cmNone to 150 cm
Soil Water RegimeNot wet within 80 cm for over 3 months, nor wet within 40 cm for over 1 monthNot wet within 80 cm for over 3 months, nor wet within 40 cm for over 1 month  Not wet within 80 cm for over 3 months, nor wet within 40 cm for over 1 monthNot wet within 80 cm for over 3 months, nor wet within 40 cm for over 1 month
Topsoil Properties
Gravel12 %12 %6 %21 %25 %9 %
Sand48 %48 %49 %42 %47 %42 %
Silt28 %28 %31 %34 %34 %36 %
Clay24 %24 %20 %24 %19 %22 %
USDA TextureLoamLoamLoamLoamLoamLoam
Reference Bulk Density1.4 g/cm³1.4 g/cm³1.43 g/cm³1.38 g/cm³1.43 g/cm³1.4 g/cm³
Bulk Density1.53 g/cm³1.53 g/cm³1.1 g/cm³1.3 g/cm³1.21 g/cm³1.37 g/cm³
Organic Carbon0.83 %0.83 %2.4 %1.61 %0.98 %1 %
PH6.36.35.17.56.46.6
Clay Cation Exchange Capacity39 cmol kg⁻¹39 cmol kg⁻¹34 cmol kg⁻¹42 cmol kg⁻¹40 cmol kg⁻¹55 cmol kg⁻¹
Soil Cation Exchange Capacity12 cmol kg⁻¹12 cmol kg⁻¹12 cmol kg⁻¹16 cmol kg⁻¹12 cmol kg⁻¹16 cmol kg⁻¹
Base Saturation88 %88 %36 %100 %78 %93 %
Total Exchangeable Bases10 cmol kg⁻¹10 cmol kg⁻¹4.7 cmol kg⁻¹15.5 cmol kg⁻¹14 cmol kg⁻¹14 cmol kg⁻¹
Calcium Carbonate0 %0 %0 %3.9 %0 %0 %
Calcium Sulphate0 %0 %0 %0 %0 %0 %
Exchangeable Sodium1 %1 %4 %3 %1 %2 %
Electrical Conductivity0.1 dS m-10.1 dS m-10.1 dS m-10.1 dS m-10.1 dS m-10.1 dS m-1
Subsoil Properties
Gravel8 %8 %  28 %12 %
Sand41 %41 %  51 %41 %
Silt25 %25 %  31 %34 %
Clay34 %34 %  18 %25 %
USDA TextureClay loamClay loam  LoamLoam
Reference Bulk Density1.33 g/cm³1.33 g/cm³  1.44 g/cm³1.38 g/cm³
Bulk Density1.51 g/cm³1.51 g/cm³  1.45 g/cm³1.39 g/cm³
Organic Carbon0.4 %0.4 %  0.4 %0.37 %
PH6.46.4  6.97
Clay Cation Exchange Capacity41 cmol kg⁻¹41 cmol kg⁻¹  56 cmol kg⁻¹55 cmol kg⁻¹
Soil Cation Exchange Capacity15 cmol kg⁻¹15 cmol kg⁻¹  11 cmol kg⁻¹15 cmol kg⁻¹
Base Saturation90 %90 %  89 %93 %
Total Exchangeable Bases12 cmol kg⁻¹12 cmol kg⁻¹  10.3 cmol kg⁻¹15.1 cmol kg⁻¹
Calcium Carbonate0 %0 %  0 %0.1 %
Calcium Sulphate0 %0 %  0 %0 %
Exchangeable Sodium1 %1 %  2 %2 %
Electrical Conductivity0.1 dS m-10.1 dS m-1  0.1 dS m-10.1 dS m-1
Soil data provided by FAO/IIASA/ISRIC/ISSCAS/JRC, 2012. Harmonized World Soil Database (version 1.2). FAO, Rome, Italy and IIASA, Laxenburg, Austria.
Köppen climate classification provided by Kottek, M., J. Grieser, C. Beck, B. Rudolf, and F. Rubel, 2006: World Map of Köppen-Geiger Climate Classification updated. Meteorol. Z., 15, 259-263