数据监测区位于广西友谊关森林生态系统国家定位观测研究站（106.86°-106.88°E，22.04°N），隶属中国林业科学研究院热带林业实验中心。为深入研究森林水分利用格局，利用TDP热扩散探针技术，在林分调查的基础上，于红椎、马尾松人工林内设置30×30 m样地，开展南亚热带典型人工林树干液流连续动态监测和研究。本数据集共包含1个excel文件，由2020年5月~2021年4月南亚热带优势树种红椎、马尾松人工林24小时动态监测数据组成，共17184条记录。
", "ds_source": "本数据集是树干液流自动观测数据集，由2020年5月~2021年4月红椎、马尾松人工林24小时动态监测数据组成。在样地内选择生长良好、树体通直、无被挤压的标准木6株，应用热扩散茎流计(TDP-30, Dynamax, Houston, USA)进行树干液流的连续观测。本试验热扩散探针均安装在树干靠北侧的同一高度，以避免太阳辐射的影响及液流在不同方位和高度间的差异，并使用锡箔护罩将安装探头所在的树干部分包裹起来，使用CRl000数据采集器(Campbell Scientific, Logen, USA)设置采样程序记录并存储数据，数据采样间隔为1h。
", "ds_process_way": "根据通用的Granier液流计算公式计算树干液流速率JS： \nJS =0.0119×[(dtmax–dtact)/ dtact]1.231\n式中，JS是树干液流速率(ml/cm2/s)；dtmax是植株无液流时，即JS =0时TDP两探针间的温差值；dtact是植株有液流时，TDP两探针间的温差值，dt0为探头S0与 S1之间的温度差（℃）；dt1为探头S2与S1之间的温度差（℃）；dt2为探头S3与S1之间的温度差（℃）。
", "ds_quality": "样地的选择及设置具有典型性、代表性，树干液流数据由仪器进行24小时自动观测，配备专业监测人员按时进行观测数据的收集及整理，观测数据完整可靠。
", "ds_acq_start_time": "2020-05-01 00:00:00", "ds_acq_end_time": "2021-04-30 00:00:00", "ds_acq_place": "广西友谊关森林生态系统国家定位观测研究站", "ds_acq_lon_east": null, "ds_acq_lat_south": null, "ds_acq_lon_west": null, "ds_acq_lat_north": null, "ds_acq_alt_low": 550.0, "ds_acq_alt_high": 600.0, "ds_share_type": "apply-access", "ds_total_size": 1463152, "ds_files_count": 2, "ds_format": ".xlsx", "ds_space_res": null, "ds_time_res": "时", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "11d0acb6-ce80-43e2-aee5-ae577c54178e.jpg", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "本数据由中国林业科学研究院热带林业实验中心“广西友谊关森林生态系统国家定位观测研究站”产生，用户在使用数据时请在正文中明确注明数据的来源，并在参考文献部分引用本元数据提供的引用方式。", "ds_from_station": null, "organization_id": "52b7b79b-860c-49a5-9083-9a70cf8bed5a", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967592", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "10.12072/ncdc.Eco-Hydro.db1664.2022", "subject_codes": [ "170.4510" ], "quality_level": 3, "publish_time": "2022-01-25 11:23:55", "last_updated": "2025-04-24 16:06:32", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.nieer.db1664.2022", "i18n": { "en": { "title": "Trunk sap flow dataset of dominant tree species in the South Asian tropics (2020-2021)", "ds_format": ".xlsx", "ds_source": "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.", "ds_quality": "
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.", "ds_ref_way": "", "ds_abstract": "
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.
", "ds_time_res": "时", "ds_acq_place": "Guangxi Youyiguan Forest Ecosystem National Positioning Observation and Research Station", "ds_space_res": "", "ds_projection": "", "ds_process_way": "Calculate the trunk sap flow rate JS according to the universal Granier sap flow calculation formula:\nJS =0.0119×[(dtmax–dtact)/ dtact]1.231\nIn 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.", "ds_ref_instruction": "\r\nThis data was generated by the \"Guangxi Friendship Pass Forest Ecosystem National Positioning Observation and Research Station\" of the Tropical Forestry Experimental Center of the Chinese Academy of Forestry. Users are requested to clearly indicate the source of the data in the main text and cite the citation method provided in this metadata in the reference section when using the data." } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "is_paper_in_submitting": false, "ds_topic_tags": [ "树干液流", "南亚热带", "人工林" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "广西友谊关森林生态系统国家定位观测研究站" ], "ds_time_tags": [ 2020, 2021 ], "ds_contributors": [ { "true_name": "郑路", "email": "1679634722@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "闵惠琳", "email": "644322069@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "张继辉", "email": "1335902871@qq.com", "work_for": "广西壮族自治区林业勘测设计院", "country": "中国" }, { "true_name": "刘士玲", "email": "928439318@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "李华", "email": "710842076@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "舒韦维", "email": "43142147@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "马俊旭", "email": "1137047903@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "杨坤", "email": "673725258@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "韦菊玲", "email": "276891314@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "闵惠琳", "email": "644322069@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" } ], "ds_managers": [ { "true_name": "郑路", "email": "1679634722@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" }, { "true_name": "闵惠琳", "email": "644322069@qq.com", "work_for": "中国林业科学研究院热带林业实验中心", "country": "中国" } ], "category": "水文" }