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Water storage dynamics and infiltration depth of soil and water conservation forest in the Loess Plateau of western Shanxi province |
GAO Siyuan1, ZHANG Jianjun1,2, LI Liang1, ZHANG Haibo1, SUN Ruoxiu1 |
1. Key Laboratory of Soil and Water Conservation & Desertification Combating of Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing, China;
2. National Field Research Station of Forest Ecosystem in Ji County, 042200, Linfen, Shanxi, China |
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Abstract [Background] In order to explore the dynamic characteristics of water storage in the soil and water conservation forests on the Loess Plateau, the redistribution effects of the level terraces on rainwater and runoff, and the depth of rainwater penetration under different rainfall conditions were analyzed.[Methods] In this study, artificial Platycladus orientalis forest and artificial Pinus tabuliformis forest in the Loess Plateau of western Shanxi province were selected as research objects, the soil moisture content of 0-200 cm soil profile and the precipitation were determined respectively, through the application of EnviroSMART soil moisture monitoring system and HOBO tipping rain gauge. Based on the theory of water balance, the dynamic characteristics of forestland water storage capacity, the rate of forestland water accumulation and the rate of extinction were analyzed, and the effect of precipitation on the depth of rainwater penetration was explored based on the wetting front.[Results] 1) The soil water storage of P. orientalis forest (368.99 mm) was greater than that of P. tabuliformis forest (320.58 mm). 2) The average annual storage water of the level terrace (408.55 mm)> the average annual storage water of the slope (281.01 mm), On the level terraces, the storage is 127.54 mm more on the slope. 3) According to the coefficient of variation of soil water storage capacity, a year could be divided into 4 periods, stabile period of soil moisture (February-April), accumulation period of soil moisture (May-July), fluctuation period of soil moisture (August-October), fading period of soil moisture (November-January of the next year). 4) The average accumulation rate of water storage during the accumulation period is 0.68 mm/d in the P. orientalis forest, 0.64 mm/d in the P. tabuliformis forest, and the average speed of the water in the fading period is 0.34 mm/d in the P. orientalis forest, 0.36 mm/d in the P. tabuliformis forest. 5) The penetration depth of the rainwater in the P. orientalis forest is greater than that in the P. tabuliformis forest. The depth soil water responding to rainfall of the level terrace is deeper than the slope. Under the heavy rain condition, the infiltration depth of the rainwater in the P. orientalis forest is 90 cm (slope)-110 cm (level terrace), and in the P. tabuliformis forest is 60 cm (slope)-70 cm (level terrace).[Conclusions] It is recommended to use level terrace and select P. orientalis when planting soil and water conservation forests on the Loess Plateau.
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Received: 10 July 2018
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