黑河生态水文遥感试验：非均匀下垫面地表蒸散发的多尺度观测试验-通量观测矩阵（稳定同位素观测数据集）

该数据集包含了通量观测矩阵中15测点(大满超级站)2012年5月27日至9月21日的大气水汽氢氧稳定同位素比值和通量数据集、玉米土壤和茎秆氢氧稳定同位素比值数据集；13测点航空遥感飞行时大气水汽氢氧稳定同位素比值数据集、13和15测点航空遥感飞行时玉米土壤和茎秆氢氧稳定同位素比值数据集。站点位于甘肃省张掖市盈科灌区农田内，下垫面均是玉米。15测点的经纬度是100.3722E，38.8555N， 13测点的经纬度是 100.3785E，38.8607N，海拔1552.75m。15测点采用大气水汽δ18O和δD比值和通量的原位连续观测系统进行连续观测，该系统两个进气口高度为玉米冠层上方0.5m和1.5m，采样频率为0.2Hz，进气口切换时间为2min，数据时间间隔为1hr；玉米土壤和茎秆水样品的采样频率为1~3d。13测点采用大气水汽δ18O和δD比值和通量的移动观测系统进行短期观测；大气水汽、玉米土壤和茎秆水样品的采样频率与航空遥感飞行相匹配。
15测点大气水汽氢氧稳定同位素比值和通量数据集的项目包括：Timestamp（时间，timestamp without time zone），Number（有效数据数量），δD of r1（下进气口δD，‰），δD of r2（上进气口δD，‰），δ18O of r1（下进气口δ18O，‰），δ18O of r2上进气口δ18O（‰），vapor mixing ratio of r1（下进气口水汽混合比，mmol/mol)，vapor mixing ratio of r2（上进气口水汽混合比，mmol/mol），δET_D（蒸散δD，‰），δET_18O（蒸散δ18O，‰）；15测点玉米土壤和茎秆氢氧稳定同位素比值数据集的项目包括Timestamp（时间，timestamp without time zone)，Remark（处理：裸地土壤Ld=1；覆膜土壤Fm=2；父本土壤F=3；茎秆Xylem=4），δD（‰），δ18O（‰）。15测点土壤蒸发和植物蒸腾占蒸散比例的数据集的项目包括Timestamp（时间，timestamp without time zone），E/ET（土壤蒸发占蒸散比例，%），T/ET（植物蒸腾占蒸散比例，%）。植物蒸腾占蒸散的比例变异范围为53.6~99.8%，平均值(±标准偏差)86.7±5.2% 。土壤蒸发占蒸散的比例变异范围为0.2~46.4%，平均值(±标准偏差) 13.3 ±5.2%。
13测点航空遥感飞行时大气水汽氢氧稳定同位素比值数据集的项目包括Timestamp1（开始时间，timestamp without time zone)，Timetamp2（结束时间，timestamp without time zone)，Height（观测高度，cm），δD（‰），δ18O（‰）。13和15测点航空遥感飞行时玉米土壤和茎秆氢氧稳定同位素比值数据集的项目包括Timestamp(时间，timestamp without time zone)，Remark（处理：裸地土壤Ld=1；覆膜土壤Fm=2；茎秆Xylem=4），δD（‰），δ18O（‰），Location（测点：13或15测点）；缺失数据标记为-6999。
多尺度观测试验或站点信息请参考Liu et al. (2016)，观测数据处理请参考Wen et al.(2016)。

This dataset contains atmospheric water vapor hydrogen and oxygen stable isotope ratios and flux datasets for Site 15 (Daman Super Station) from May 27 to September 21, 2012, as well as hydrogen and oxygen stable isotope ratio datasets for maize soil and stem samples, all sourced from the flux observation matrix; it also includes atmospheric water vapor hydrogen and oxygen stable isotope ratio datasets during the aerial remote sensing flight at Site 13, and hydrogen and oxygen stable isotope ratio datasets for maize soil and stem samples during the aerial remote sensing flights at Sites 13 and 15.
The sites are located in the farmland of Yingke Irrigation District, Zhangye City, Gansu Province, with the underlying surface being maize fields for all sites. The coordinates of Site 15 are 100.3722°E, 38.8555°N, while those of Site 13 are 100.3785°E, 38.8607°N, with an altitude of 1552.75 m.
Site 15 conducted continuous observations using an in-situ continuous monitoring system for atmospheric water vapor δ¹⁸O and δD ratios and fluxes. This system is equipped with two air intake ports at heights of 0.5 m and 1.5 m above the maize canopy, with a sampling frequency of 0.2 Hz, an air intake port switching interval of 2 min, and a data temporal resolution of 1 hr; the sampling interval for maize soil and stem water samples is 1–3 days. Site 13 carried out short-term observations using a mobile monitoring system for atmospheric water vapor δ¹⁸O and δD ratios and fluxes; the sampling frequencies for atmospheric water vapor, maize soil and stem water samples match the schedule of the aerial remote sensing flights.
The items included in the atmospheric water vapor hydrogen and oxygen stable isotope ratios and flux dataset at Site 15 are: Timestamp (time, timestamp without time zone), Number (valid data count), δD of r1 (δD of the lower intake port, ‰), δD of r2 (δD of the upper intake port, ‰), δ¹⁸O of r1 (δ¹⁸O of the lower intake port, ‰), δ¹⁸O of r2 (δ¹⁸O of the upper intake port, ‰), vapor mixing ratio of r1 (water vapor mixing ratio of the lower intake port, mmol/mol), vapor mixing ratio of r2 (water vapor mixing ratio of the upper intake port, mmol/mol), δET_D (δD of evapotranspiration, ‰), δET_¹⁸O (δ¹⁸O of evapotranspiration, ‰);
The items included in the hydrogen and oxygen stable isotope ratio dataset for maize soil and stem samples at Site 15 are: Timestamp (time, timestamp without time zone), Remark (treatment: bare soil Ld=1; plastic-mulched soil Fm=2; paternal parent soil F=3; stem xylem=4), δD (‰), δ¹⁸O (‰).
The items included in the dataset for the proportions of soil evaporation and plant transpiration within total evapotranspiration at Site 15 are: Timestamp (time, timestamp without time zone), E/ET (proportion of soil evaporation in evapotranspiration, %), T/ET (proportion of plant transpiration in evapotranspiration, %). The variation range of plant transpiration proportion in evapotranspiration is 53.6–99.8%, with the mean (± standard deviation) being 86.7 ± 5.2%. The variation range of soil evaporation proportion in evapotranspiration is 0.2–46.4%, with the mean (± standard deviation) being 13.3 ± 5.2%.
The items included in the atmospheric water vapor hydrogen and oxygen stable isotope ratio dataset during the aerial remote sensing flight at Site 13 are: Timestamp1 (start time, timestamp without time zone), Timestamp2 (end time, timestamp without time zone), Height (observation height, cm), δD (‰), δ¹⁸O (‰).
The items included in the hydrogen and oxygen stable isotope ratio dataset for maize soil and stem samples during the aerial remote sensing flights at Sites 13 and 15 are: Timestamp (time, timestamp without time zone), Remark (treatment: bare soil Ld=1; plastic-mulched soil Fm=2; stem xylem=4), δD (‰), δ¹⁸O (‰), Location (measurement site: Site 13 or Site 15); missing data is marked as -6999.
For multi-scale observation experiments or site information, please refer to Liu et al. (2016), and for observation data processing, please refer to Wen et al. (2016).