下游航空遥感试验期间，开展了下游典型植被地表土壤呼吸观测，观测自2014年7月23日开始，8月2日结束。\n
\n1、 观测时间\n
\n2014年7月23日至8月2日每天观测一次，其中7月25日中断一天\n
\n2、 样方选择及观测方式\n
\n结合下游植被特征和站点分布，选择临近于站点、面积分布大于100 m100 m且均一的植被作为观测样地，共选取了5个观测样地，包括胡杨柽柳混合林、胡杨林、柽柳群、裸地和瓜地样地；在每一样地中，选取具有代表性的3-5个点，提前一天打入土壤环(内径为19.5cm，外径为20.0cm，高12cm，尽量保持打入后的PVC露出地面5cm左右)，尽可能不扰动地表的植被和凋谢物。经过24h平衡，土壤呼吸速率恢复到原来状态，避免了由于基座的安置而造成的对土壤呼吸速率的波动。\n
\n观测时间段为每天上午的8：00至12：00（这段时间土壤呼吸比较稳定，能够代表整天的土壤呼吸速率），运用LI-8100开路式土壤碳通量自动测定仪（Model 8100-103）分别对每个样地内样点测量一次，每天完成5块样地的一次循环观测，每块样地取所观测样点的平均值作为该样地的土壤呼吸值。\n
\n3、 观测仪器\n
\n中科院地环所Li-8100（Li-COR，USA）开路式土壤碳通量自动测定仪\n
\n4、 数据存储\n
\n本数据集包括Li-8100导出的*.81x格式的数据（用Li-8100配套软件打开，也可以用txt打开）、Excel格式观测记录表以及实验照片。
", "ds_source": "下游航空遥感试验期间，开展了下游典型植被地表土壤呼吸观测，观测自2014年7月23日开始，8月2日结束。
", "ds_process_way": "1.观测时间：2014年7月23日至8月2日每天观测一次，其中7月25日中断一天。\n
\n2.样方选择及观测方式\n结合下游植被特征和站点分布，选择临近于站点、面积分布大于100 m100 m且均一的植被作为观测样地，共选取了5个观测样地，包括胡杨柽柳混合林、胡杨林、柽柳群、裸地和瓜地样地；在每一样地中，选取具有代表性的3-5个点，提前一天打入土壤环(内径为19.5cm，外径为20.0cm，高12cm，尽量保持打入后的PVC露出地面5cm左右)，尽可能不扰动地表的植被和凋谢物。经过24h平衡，土壤呼吸速率恢复到原来状态，避免了由于基座的安置而造成的对土壤呼吸速率的波动。\n
\n观测时间段为每天上午的8：00至12：00（这段时间土壤呼吸比较稳定，能够代表整天的土壤呼吸速率），运用LI-8100开路式土壤碳通量自动测定仪（Model 8100-103）分别对每个样地内样点测量一次，每天完成5块样地的一次循环观测，每块样地取所观测样点的平均值作为该样地的土壤呼吸值。\n
\n3.观测仪器\n
\n中科院地环所Li-8100（Li-COR，USA）开路式土壤碳通量自动测定仪
", "ds_quality": "数据质量良好
", "ds_acq_start_time": "2014-07-23 00:00:00", "ds_acq_end_time": "2014-08-02 00:00:00", "ds_acq_place": "黑河流域,下游天然绿洲试验区", "ds_acq_lon_east": 101.91666666666667, "ds_acq_lat_south": 41.95, "ds_acq_lon_west": 101.01666666666667, "ds_acq_lat_north": 42.016666666666666, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 2225082, "ds_files_count": 2, "ds_format": "txt", "ds_space_res": null, "ds_time_res": "日", "ds_coordinate": "WGS84", "ds_projection": "", "ds_thumbnail": "07f65c8c-2a2e-428a-995c-2565f99fedc6.png", "ds_thumb_from": 0, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "本数据由“黑河生态水文遥感试验（HiWATER）”产生，用户在使用数据时请在正文中明确声明数据的来源，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": "c94b3578-20da-4346-9de9-c702b6ca8983", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [], "quality_level": 3, "publish_time": "2021-09-01 10:24:26", "last_updated": "2024-05-28 15:28:49", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.NIEER.2021.1856", "i18n": { "en": { "title": "Heihe River eco hydrological remote sensing experiment: li-8100 observation soil respiration data set in the lower reaches of Heihe River (July August 2014)", "ds_format": "", "ds_source": "During the downstream aerial remote sensing test, the observation of surface soil respiration of typical downstream vegetation was carried out from July 23 to August 2, 2014
", "ds_quality": "Good data quality
", "ds_ref_way": "", "ds_abstract": "During the downstream aerial remote sensing test, the observation of surface soil respiration of typical downstream vegetation was carried out from July 23 to August 2, 2014.\n
\n1. Observation time\n
\nThe observation was conducted once a day from July 23 to August 2, 2014, with one day off on July 25\n
\n2. Quadrat selection and observation method\n
\nCombined with the downstream vegetation characteristics and site distribution, the vegetation close to the site with an area distribution of more than 100 m 100 m is selected as the observation sample plot, and a total of 5 observation sample plots are selected, including Populus euphratica and Tamarix mixed forest, Populus euphratica forest, Tamarix group, bare land and melon land; In each plot, select 3-5 representative points and drive the soil ring one day in advance (the inner diameter is 19.5cm, the outer diameter is 20.0cm and the height is 12cm. Try to keep the driven PVC about 5cm above the ground), so as not to disturb the vegetation and litter on the ground as much as possible. After 24h balance, the soil respiration rate returns to the original state, avoiding the fluctuation of soil respiration rate caused by the placement of the base.\n
\nThe observation period is from 8:00 a.m. to 12:00 a.m. (during this period, the soil respiration is relatively stable and can represent the soil respiration rate of the whole day). The li-8100 open circuit automatic soil carbon flux tester (model 8100-103) is used to measure the sample points in each sample plot respectively, and the cyclic observation of 5 sample plots is completed every day, The average value of the observed sample points of each sample plot is taken as the soil respiration value of the sample plot.\n
\n3. Observation instrument\n
\nLi-8100 (Li COR, USA) open circuit automatic soil carbon flux tester, Institute of earth environment, Chinese Academy of Sciences\n
\n4. Data storage\n
\nThis data set includes data in *. 81x format exported by li-8100 (opened with li-8100 supporting software or txt), observation record table in Excel format and experimental photos
", "ds_time_res": "日", "ds_acq_place": "Heihe River Basin, downstream natural oasis, experimental area", "ds_space_res": "", "ds_projection": "", "ds_process_way": "1. Observation time: once a day from July 23 to August 2, 2014, including one day off on July 25.\n
\n2. Quadrat selection and observation method\nCombined with the downstream vegetation characteristics and site distribution, the vegetation close to the site with an area distribution of more than 100 m 100 m is selected as the observation sample plot, and a total of 5 observation sample plots are selected, including Populus euphratica and Tamarix mixed forest, Populus euphratica forest, Tamarix group, bare land and melon land; In each plot, select 3-5 representative points and drive the soil ring one day in advance (the inner diameter is 19.5cm, the outer diameter is 20.0cm and the height is 12cm. Try to keep the driven PVC about 5cm above the ground), so as not to disturb the vegetation and litter on the ground as much as possible. After 24h balance, the soil respiration rate returns to the original state, avoiding the fluctuation of soil respiration rate caused by the placement of the base.\n
\nThe observation period is from 8:00 a.m. to 12:00 a.m. (during this period, the soil respiration is relatively stable and can represent the soil respiration rate of the whole day). The li-8100 open circuit automatic soil carbon flux tester (model 8100-103) is used to measure the sample points in each sample plot respectively, and the cyclic observation of 5 sample plots is completed every day, The average value of the observed sample points of each sample plot is taken as the soil respiration value of the sample plot.\n
\n3. Observation instrument\n
\nLi-8100 (Li COR, USA) open circuit automatic soil carbon flux tester, Institute of earth environment, Chinese Academy of Sciences
", "ds_ref_instruction": "This data is generated by \"Heihe eco hydrological remote sensing experiment (hiwater)\". When using the data, users should clearly state the source of the data in the text and quote the reference method provided by this metadata in the reference part." } }, "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, "ds_topic_tags": [ "土壤呼吸", "土壤", "土壤温度" ], "ds_subject_tags": [], "ds_class_tags": [], "ds_locus_tags": [ "下游天然绿洲试验区", "黑河流域" ], "ds_time_tags": [ 2014 ], "ds_contributors": [ { "true_name": "任志国", "email": "rzgehu@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "任志国", "email": "rzgehu@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "ds_managers": [ { "true_name": "马明国", "email": "mmg@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" }, { "true_name": "任志国", "email": "rzgehu@lzb.ac.cn", "work_for": "中国科学院西北生态环境资源研究院", "country": "中国" } ], "category": "生态" }