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[1]XIA Yinhua,ZHANG Xinping,DAI Junjie,et al.Response of Stem Sap Flow of Cinnamomum Camphora to Precipitation Under Different Environments in the Subtropical Monsoon Region[J].Research of Soil and Water Conservation,2021,28(06):144-152.

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Response of Stem Sap Flow of Cinnamomum Camphora to Precipitation Under Different Environments in the Subtropical Monsoon Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 06 Page number: 144-152 Column: Public date: 2021-10-10

Title:: Response of Stem Sap Flow of Cinnamomum Camphora to Precipitation Under Different Environments in the Subtropical Monsoon Region

Author(s):: XIA Yinhua¹，ZHANG Xinping^1,2，DAI Junjie¹，WANG Rui¹，LUO Zidong¹; (1.College of Geographical Sciences，Hunan Normal University，Changsha 410081，China; 2.Key Laboratory of Geospatial Big Data Mining and Applicaion，Hunan Normal University，Changsha 410081，China)

Keywords:: stem sap flow; thermal dissipation probe; precipitation; soil moisture content; variable transpiration

CLC:: S715.4

DOI:: -

Abstract:: In order to explore rainfall effects on sap flow of Cinnamomum camphora，thermal dissipation probe(TDP)was used to measure the stem sap flow of sample trees in Changsha from June 2019 to May 2020. Moreover the soil moisture content and meteorological factors were observed simultaneously. This study analyzed the diurnal variation characteristics of the stem sap flow under different weather conditions and its response to precipitation in different intensities. What's more，the response of sap flow to environmental factors under different soil moisture conditions had also been investigated. The results show that:(1)the sap flow changed with the weather，and it was higher on sunny days than on rainy days; daily variations of sap flow exhibited invented ‘U' mono-peak patterns during sunny days and showed single-peak or multi-peak curves or were always at a low level with the distribution of precipitation during rainy days; weather factors on sunny days could explain sap flow better than on rainy days;(2)precipitation with different intensities exerted different impacts on sap flow; sap flow was little change after 0～5 mm precipitation，whereas the sap flow increased significantly while the precipitation was more than 5 mm; however，there was no obvious regularity between the increase of sap flow and precipitation intensity; the sap flow after precipitation with 5～10 mm，10～25 mm，25～50 mm and greater than 50 mm increased by 13.2%，47.3%，20.6% and 5.5%，respectively;(3)the sap flow in the relative deficient period of soil moisture(RDP)and lack of rain was lower than that in the relative sufficient period of soil moisture(RSP)and plenty of precipitation; the sap flow in the two periods showed a quadratic function relation with meteorological factors; the relationship between liquid flow and variable transpiration under different soil water conditions could be fitted by the exponential saturation function; it was found that the transpiration of C. camphora was inhibited in RDP，and the sensitivity of transpiration reacting to solar radiation，temperature，saturated vapor pressure difference and relative humidity improved in RSP; moreover，the conductivity of the stem was enhanced too. In this study，the response of the stem sap flow to precipitation showed great difference due to the different precipitation，and there was a certain precipitation threshold that made the sap flow rise after precipitation. Precipitation can increase the sap flow level of C. camphora by changing meteorological factors and improving soil moisture.

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Last Update: 2021-10-10