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[1]CHANG Enhao,LI Peng,LIU Ying,et al.Spatial Distribution Characteristics of Pinus tabulaeformis Fine Root on Sloping Land in Loess Hilly Region[J].Research of Soil and Water Conservation,2016,23(05):28-34.

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Spatial Distribution Characteristics of Pinus tabulaeformis Fine Root on Sloping Land in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 05 Page number: 28-34 Column: Public date: 2016-10-28

Title:: Spatial Distribution Characteristics of Pinus tabulaeformis Fine Root on Sloping Land in Loess Hilly Region

Author(s):: CHANG Enhao, LI Peng, LIU Ying, XU Guoce, KE Haocheng, LIU Qi, LI Xiongfei; State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi’an University of Technology, Xi’an 710048, China

Keywords:: Pinus tabulaeformis; fine root; slope position; soil layer; extinction coefficient; path analysis

CLC:: S791.254

DOI:: -

Abstract:: Root system is sensitive to soil environment and plays an important role in forest ecosystem. Fine root is the core link for mass circulation and energy flow between vegetation and soil environment. Based on the former research about the spatial distribution of fine root, there were significant differences both in vertical and horizontal distribution. Due to different slope positions (SP), the light and heat conditions and soil physicochemical properties were various, which had effects on biological and botanical characteristics of vegetation. These discrepancies could affect the growth and distribution of fine root. Therefore, the study on spatial distribution of fine root on slope is important. Targeting at the artificial Pinus tabulaeformis forest in Loess Hilly Region, the grid sampling method was used to analyze the root morphology, biomass spatial variability with 10 m (SP₁), 20 m (SP₂), 30 m (SP₃) and 40 m (SP₄) from the top of the sloping land. The results showed that: (1) The fine root weight density (FRWD) and fine root length density (FRLD) mainly clustered in the 0—100 cm soil layer which accounted for 83% and 81% of that in the 0—180 cm soil layer, respectively. They decreased exponentially with the increase of soil depth and the specific root length (SRL) added along soil depth, known from the extinction coefficient, the FRWD with 0～2 mm diameter in deep soil layer was less and that with 0～0.5 mm diameter was the least which indicated that the smaller of root diameter, the less FRWD distributed in deep layer; (2) In horizontal direction, the distribution of FRWD, FRLD and fine root area density (FRAD) with various SP showed ‘N’ type. FRWD, FRLD and SRL had significant difference (p < 0.05) with the different SP. FRWD (1.26 mg/cm³), FRLD (7.21 mm/cm³) and FRAD (13.28 mm²/cm³) in SP₁ were significantly less than that in SP₂, SP₃ and SP₄ (p < 0.05). The distribution of specific root length (SRL) and specific root area (SRA) with SP showed V-shape. While the SRL (1 099.36 mm/mg) and SRA (1 075.48 mm²/mg) in SP₁ were significantly higher than other SP (p < 0.05); (3) Fine root growth on SP₁ were significantly different from other SP (p < 0.05), soil water and nutrients were also different from other SP. The spatial difference of fine root was caused by the soil properties of various site conditions with four SP. The direct and indirect effect of soil water, total nitrogen, total phosphorus and total organic carbon on the spatial distribution of fine root was determined by the path coefficient analysis. Regression analysis showed that the main factor of spatial distribution of fine root is the soil water, which had extremely significant effect (p < 0.01) on fine root of Pinus tabulaeformis. The results will supply references for the influence mechanism of site conditions on root behaviors, and provide scientific basis for the arrangement of soil and water conservation vegetation measures in the loess hilly region.

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