The data monitoring area is located at the National Positioning Observation and Research Station of the Youyiguan Forest Ecosystem in Guangxi (106.86 ° -106.88 ° E, 22.04 ° N), under the jurisdiction of the Tropical Forestry Experimental Center of the Chinese Academy of Forestry. To conduct in-depth research on forest water use patterns, TDP thermal diffusion probe technology was used to set up 30 × 30 m plots in artificial forests of Pinus massoniana and Pinus koraiensis, based on forest stand surveys, to carry out continuous dynamic monitoring and research on trunk sap flow in typical artificial forests in the South Asian tropics. This dataset contains one Excel file, consisting of 24-hour dynamic monitoring data of the dominant tree species in the South Asian tropical region, red vertebrae and Pinus massoniana plantations, from May 2020 to April 2021, with a total of 17184 records.
This dataset is an automatic observation dataset for trunk sap flow, consisting of 24-hour dynamic monitoring data from May 2020 to April 2021 for artificial forests of Pinus massoniana and Pinus massoniana. Select 6 standard trees with good growth, straight trees, and no compression in the sample plot, and use a thermal diffusive stem flow meter (TDP-30, Dynamax, Houston, USA) for continuous observation of trunk sap flow. The thermal diffusion probes in this experiment were installed at the same height on the north side of the tree trunk to avoid the influence of solar radiation and differences in liquid flow between different directions and heights. The part of the tree trunk where the probes were installed was wrapped with a tin foil cover, and a CRl000 data collector (Campbell Scientific, Logen, USA) was used to set up a sampling program to record and store data, with a sampling interval of 1 hour.
Calculate the trunk sap flow rate JS according to the universal Granier sap flow calculation formula: JS =0.0119×[(dtmax–dtact)/ dtact]1.231 In the formula, JS is the sap flow rate of the tree trunk (ml/cm2/s); Dtmax is the temperature difference between the two TDP probes when there is no liquid flow in the plant, i.e. JS=0; Dtact is the temperature difference between the two TDP probes when there is liquid flow in the plant, and dt0 is the temperature difference (℃) between probes S0 and S1; Dt1 is the temperature difference (℃) between probe S2 and S1; Dt2 is the temperature difference (℃) between probe S3 and S1.
The selection and setting of sample plots are typical and representative. The sap flow data of tree trunks is automatically observed 24 hours a day by instruments, and professional monitoring personnel are equipped to collect and organize the observation data on time. The observation data is complete and reliable.
| # | number | name | type |
| 1 | 桂科AD20159094 | other | |
| 2 | 桂科22-035-130-03 | other |
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CSTR:11738.11.ncdc.nieer.db1664.2022
10.12072/ncdc.Eco-Hydro.db1664.2022