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[1]GE Bo,DU Yan,CHANG Meng,et al.Soil Water Content and Lateral Rheology of Cunninghamia lanceolata Forest Under Different Rainfall Levels[J].Research of Soil and Water Conservation,2019,26(02):161-166.

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Soil Water Content and Lateral Rheology of Cunninghamia lanceolata Forest Under Different Rainfall Levels

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 161-166 Column: Public date: 2019-04-28

Title:: Soil Water Content and Lateral Rheology of Cunninghamia lanceolata Forest Under Different Rainfall Levels

Author(s):: GE Bo, DU Yan, CHANG Meng, LI Jiaxin, LIU Chao, ZHUANG Jiayao; Soil and Water Conservation and Ecological Restoration Laboratory, Nanjing Forestry University, Nanjing 210037, China

Keywords:: Cunninghamia lanceolata stand; soil moisture content; lateral flow; rainfall intensity

CLC:: S715.3

DOI:: -

Abstract:: This study examined the impact of different rainfall levels on soil moisture content and Lateral flow in different soil depths of the forest to explore the response of the soil moisture content and the change of lateral flow in each soil layer in fir forest in Nanjing suburb, analyzed the relationship within the variation of soil moisture content, cumulative rainfall and the lateral flow, and preliminary discuss the water conservation mechanism of Chinese fir forest. The 46-year-old fir forest of Nanjing Tongshan Forestry Centre was selected as the study site. The soil moisture content of soil profiles 0—5 cm,5—15 cm,15—30 cm and 30—60 cm were monitored continuously by using the technology of system ECH₂O under the 3 types of rainfall levels (8 mm, 17.6 mm, 28.2 mm). The results indicated that: (1) the variation curves of soil water contents in 0—5 cm soil layer and 5—15 cm soil layer and the curves of rainfall variation were synchronous; the time when the water contents of 15—30 cm soil layer and 30—60 cm soil layer reached peak had lagged for 1.0～1.5 h; (2) under the condition of drizzle, the water contents only in 0—5 cm and 5—15 cm soil layer changed obviously, the lateral flow mainly occurred in 5—15 cm soil layer; (3) under the moderate rain condition, the soil moisture content occurred obvious responses twice when the rainfall intensities were 8.0 mm/h and 15.2 mm/h, the lateral flow mainly occurred in 15—30 cm soil layer; (4) under the heavy rain, the cumulative rainfall was 22.8 mm/h, and the peak occurred in 5—5 cm，15—30 cm and 30—60 cm soil layers, the lateral flow mainly occurred in 30—60 cm soil layer; (5) the maximum lateral flow in the course of drizzle, moderate rain and heavy rain was 1.55 mm，13.88 mm and 94.77 mm, respectively; the lateral flow trended to increase with the increase of rainfall. The water infiltration was the unsaturated infiltration, the peak value of water content increased gradually and the lateral flow increased significantly with the increase of soil depth. The relationship between the change of soil water content and rainfall and the correlation was strong. The correlation between soil moisture content and rainfall is getting worse with the increase of rainfall. There was a remarkable correlation between the change of soil water content and cumulative rainfall and lateral flow. The maximum lateral flow had the exponential relationship with the cumulative rainfall: y=0.7614e^0.2238x.

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