| Autor: |
Carvalho JI; Department of Forest Resources, College of Agriculture and Life Science, Chungnam National University, Daejeon 34134, Republic of Korea., Carayugan MB; Department of Forest Resources, College of Agriculture and Life Science, Chungnam National University, Daejeon 34134, Republic of Korea., Tran LTN; Forest Environment and Geospatial Technology Research Institute, Sejong 30098, Republic of Korea., Hernandez JO; Department of Forest Biological Sciences, College of Forestry and Natural Resources, University of Philippines, Laguna 4031, Philippines., Youn WB; Department of Forest Resources, College of Agriculture and Life Science, Chungnam National University, Daejeon 34134, Republic of Korea., An JY; Division of Environmental and Forest Science, College of Agriculture and Life Sciences, Gyeongsang National University, Jinju 52725, Republic of Korea., Park BB; Department of Forest Resources, College of Agriculture and Life Science, Chungnam National University, Daejeon 34134, Republic of Korea. |
| Abstrakt: |
Root biomass and distribution are influenced by abiotic factors, such as topography and soil physicochemical properties, determining belowground productivity. Hence, we investigated the variation in root biomass and vertical root distribution based on the topography, soil physicochemical properties, and tree influence index, and their relationships, across soil depths (0-10 cm, 10-20 cm, and 20-30 cm) and topographical gradients in a warm-temperate forest in Mt. Duryun, Republic of Korea. Two contrasting research sites were established: a lower slope oriented at ≤3° and an upper slope with a slope of 30°. Each site comprised eleven 400 m 2 sampling plots from which root samples from various diameter classes (<2 mm, 2-5 mm, 5-10 mm, and >10 mm) were collected. While the bulk density increased with soil depth in the lower slope, the organic matter, available phosphorus, Ca 2+ , and Mg 2+ showed a reversed pattern. Linear mixed-effects models generally revealed significant negative correlations between root biomass and soil pH, total nitrogen, and cation exchange capacity, particularly in small roots (βstd = -1.03 to -1.51) and coarse roots (βstd = -6.30). Root biomass exhibited a 10-15% increase in the upper slope compared to the lower slope, particularly in fine (median = 52.0 g m 2 -65.64 g m 2 ) and medium roots (median = 56.04 g m 2 -69.52 g m 2 ) at a 0-20 cm soil depth. While no significant correlation between root biomass and the tree influence index was found on the lower slope, a different pattern was found on the upper slope. Our results indicate that the variation in root biomass and distribution can also be explained by the differences in the soil environment and topographical positions. |
