| Cite this article: | 牛永强,吴喆滢,徐文娴,等.马占相思幼树雨季液流速率对环境因子的响应[J].灌溉排水学报,0,():-. |
| NIU Yongqiang,WU Zheying,XU Wenxian,et al.马占相思幼树雨季液流速率对环境因子的响应[J].灌溉排水学报,0,():-. |
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| The Response of Young Acacia mangium Sap Flow Velocity to Environmental Factors in Rainy Season in Hainan |
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NIU Yongqiang1, WU Zheying2, XU Wenxian3, HAN Qi3, ZHAO Congju3
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1.Danzhou Forest Farm;2.School of Life Sciences,Hainan Normal University;3.School of Geography and Environmental Sciences,Hainan Normal University
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| Abstract: |
| 【Objective】 Revealing the characteristics of sap flow changes of young Acacia mangium and the relationship between sap flow and environmental factors provides a basis for the sustainable management of Acacia mangium plantations 【Method】 Danzhou Forest Farm located in the western Hainan Island was chosen as a research area, where the sap flow and environmental factors were continuously measured by Dynagage sap flow sensors and DL2e environmental data acquisition systems from June to October 2014. 【Result】 In sunny and cloudy days, the stem sap flow velocity of Acacia mangium exhibited similarly general trend of diurnal variations which rose rapidly to the peak value and then declined with fluctuations, and the daily average sap density was 3.07 mL·cm-2·h-1 and 1.59 mL·cm-2·h-1 respectively. However, in rainy days, the stem sap flow velocity varied more gently with a daily average value of 0.78 mL·cm-2·h-1 and did not show significant change patterns. The peak value of the sap flow velocity appeared in the morning about 9:00 in sunny days and the phenomenon of “transpiration plateau” was obvious. However, there was a delayed maximum value, and the “transpiration plateau” was not obvious or didn't exist in cloudy and rainy days. Path analysis showed that in sunny days the change of Acacia mangium sap flow velocity was mainly affected by water vapor pressure deficit (VPD), air relative humidity (RH), and air temperature (Ta), in cloudy days affected by Ta, VPD, and photosynthetically active radiation (PAR), and affected by PAR and Ta in rainy days. 【Conclusion】 The sap flow velocity of Acacia mangium shows obvious diurnal variation, and the peak value of sap flow is earlier than that of PAR, and the stronger the PAR, the earlier the peak of sap flow appears. In sunny, cloudy and rainy days, the dominant factors affecting the change of sap flow are VPD, Ta, and PAR respectively. |
| Key words: Dynagage sap flow sensors; Acacia mangium; sap flow velocity; environmental factors |
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