| Cite this article: | 姚欢欢,景元书.低丘红壤区樟树液流变化特征[J].灌溉排水学报,0,():-. |
| Yaohuanhuan,Jingyuanshu.低丘红壤区樟树液流变化特征[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Variation characteristics of camphor tree flow in low hilly red soil region |
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Yaohuanhuan1,2, Jingyuanshu1,2
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1.Nanjing University of Information Science&2.Technology
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| Abstract: |
| [Objective] To find out the transpiration water consumption law of camphor tree and improve the water use efficiency of forest stand. [Methods] The sap flow density of camphor tree was continuously monitored by the thermal diffusion SF-L plant stem flow meter in the 2016-2017 growing season (June-September), and the turf tree liquid fluid flux and meteorological factors were combined with the meteorological data. The relationship was analyzed. [Results] The results showed that: (1) During the whole growing season, there was a significant circadian rhythm of the daily sap flow variability of camphor tree saplings, and the curve showed a unimodal pattern. The amplitude of daytime flow density was large, and the morning and night amplitudes were higher. small. The monthly variation of the liquid flow density is characterized by a rise first and then a decrease. In general, the average liquid flux in 2017 was significantly larger than that in 2016; (2) the daily variation curve of trunk liquid flux on the sunny day showed a broad peak shape, and the cloudy day showed a narrow peak shape. There was no significant difference between the rainy day and the sunny and cloudy days. However, the liquid flux decreased; (3) Correlation and regression analysis showed that within a certain range, liquid flux was significantly positively correlated with solar radiation, air temperature and water vapor pressure deficit, and negatively correlated with relative humidity. The results of multiple regression analysis showed that the dominant factors in daytime, nighttime and growing season were RH, VPD and T, respectively; VPD, RH, RS, T and RH, T and RS. [Conclusion]The weather conditions have significant effects on the transpiration of camphor tree. The transpiration under typical weather conditions is sunny > cloudy > rainy days; meteorological factors are closely related to camphor tree flow changes, but during the day, night and the whole season. There are differences in the dominant factors. |
| Key words: camphor tree ;sapflow density; Low-hilly red soil area; meteorological factor；correlation |
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