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[1]DAI Junjie,ZHANG Xinping,LÜ,et al.Dynamics of Soil Water in Cinnamomum camphora Forest in the Red Soil Hilly Region of South China[J].Research of Soil and Water Conservation,2019,26(04):123-131.

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Dynamics of Soil Water in Cinnamomum camphora Forest in the Red Soil Hilly Region of South China

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 04 Page number: 123-131 Column: Public date: 2019-06-11

Title:: Dynamics of Soil Water in Cinnamomum camphora Forest in the Red Soil Hilly Region of South China

Author(s):: DAI Junjie¹, ZHANG Xinping^1,2, LÜ Dianqing¹, LUO Zidong¹, HE Xinguang^1,2; 1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China;
2. Hunan Key Laboratory of Geospatial Big Data Mining and Application, Hunan Normal University, Changsha 410081, China

Keywords:: red soil; Cinnamomum camphora forest; soil moisture; evapotranspiration; precipitation

CLC:: S152.7

DOI:: -

Abstract:: To understand the dynamics of soil water in Cinnamomum camphora forest in the red soil hilly region of south China, soil moisture and temperature in 0—100 cm soil layer and meteorological factors were observed in the entire year. Evapotranspiration was calculated based on soil moisture balance method. The temporal and spatial variations of soil moisture, evapotranspiration and their response to precipitation were studied. The results showed that: (1) the seasonal variation of soil moisture during the observation could be divided into three stages, i. e. water-rich period (from March to June), water-consuming period (from July to October) and water-replenishing period (from November to following February); (2) soil bulk water content increased from shallow to deep, and its stability increased, and its vertical variation had significant seasonal difference; (3) the seasonal variation of forest land evapotranspiration in non-precipitation days decreased in the sequence: water-consuming period (3.28 mm/day) > water-rich period (1.83 mm/day) > water-replenishing period (1.0 mm/day); the diurnal variation was characterized as strong change on daytime and weak change at night. Daily evapotranspiration was significantly positively correlated with daily average temperature, VPD and solar radiation; (4) the response of soil moisture to precipitation in dry season was stronger than that in wet season; the precipitation of 9 mm in wet season and 3 mm in dry season made the maximum depth of infiltration reach up to 10 cm, and thus, soil moisture could be replenished. Soil moisture in forestland was significantly affected by precipitation and evapotranspiration, and presented the significant spatiotemporal distribution.

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