A dataset of ecosystem fluxes in a shrubland ecosystem of Mau Us Sandy Land in Yanchi, Ningxia, China (2012-2016)

doi:10.17521/cjpe.2023.0001

Abstract

Abstract:

Arid and semi-arid ecosystem areas, which constitute an important component of the global land surface, act to regulate the long-term trend and interannual variations in global carbon and water cycles. Previous studies on the mechanisms underlying ecosystem carbon and water cycling and the development of relevant data products focus primarily on forest, grassland, and cropland ecosystems, with few research attention given to semi-arid shrublands. This research gap hinders the evaluation and projection of ecosystem functions at the regional scale. Since 2011, we used the eddy covariance technique to make continuous in situ measurements of carbon, water and heat fluxes in a shrubland ecosystem at Yanchi Research Station, the Mau Us Sandy Land. Data processing steps mainly included data collection, post-processing of raw data, quality control, gap-filling and carbon flux partitioning. We produced flux and micro-meteorological datasets at half-hourly, daily, monthly, and annual temporal resolutions for the years 2012-2016, and analyzed the overall quality of the datasets in terms of the proportion of valid data and the energy balance closure of flux measurements. Results showed: (1) After quality control, the proportion of valid data for half-hour net ecosystem CO₂ exchange (NEE), latent heat flux (LE), and sensible heat flux (Hs) was 56.23%-62.19%, 79.40%-94.12%, and 77.56%-91.27%, respectively. (2) Annual and monthly energy balance ratio ranged 0.78-0.83 and 0.59-1.19, respectively. (3) The energy balance closure estimated using the “ordinary least squares” regression method showed that the interannual and seasonal variations in the slope of regression curves varied with a range of 0.73-0.79 at interannual scale and 0.73-0.92 at seasonal scale, respectively. These results indicate that our datasets have a high proportion of valid data and a reasonable energy balance closure, and thus can be used in studies related to ecosystem processes and functions at varing spatio-temporal scales.

Key words: cabon and water fluxes, energy balance, eddy covariance, Mau Us Sandy Land, semi-arid shrubland

HAN Cong, MU Yan-Mei, ZHA Tian-Shan, QIN Shu-Gao, LIU Peng, TIAN Yun, JIA Xin. A dataset of ecosystem fluxes in a shrubland ecosystem of Mau Us Sandy Land in Yanchi, Ningxia, China (2012-2016)[J]. Chin J Plant Ecol, 2023, 47(9): 1322-1332.

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URL: https://www.plant-ecology.com/EN/10.17521/cjpe.2023.0001

https://www.plant-ecology.com/EN/Y2023/V47/I9/1322

Figures/Tables 10

References 27

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观测系统 Measurement system	数据采集器 (制造商) Datalogger (manufacturer)	观测指标 Measured variable	仪器型号 (制造商) Instrument model (manufacturer)
通量观测系统 Flux measurement system	LI-7550 (LI-COR, Lincoln, USA)	大气压 Atmospheric pressure	LI-7200 (LI-COR, Lincoln, USA)
		碳水通量 Carbon and water flux	LI-7200 (LI-COR, Lincoln, USA)
		潜热、显热通量 Latent heat and sensible heat flux	LI-7200 (LI-COR, Lincoln, USA)
		三维超声风速 3D sonic anemometer	CSAT-3 (Campbell, Logan, USA)
气象观测系统 Meteorological measurement system	CR200X (Campbell, Logan, USA)	降雨量 Rainfall	TR-525M (Texas Electronics, Dallas, USA)
	CR3000 (Campbell, Logan, USA)	空气温度 Air temperature	HMP155A (Vaisala, Helsinki, Finland)
		相对湿度 Relative humidity	HMP155A (Vaisala, Helsinki, Finland)
		饱和水汽压差 Vapor pressure deficit	HMP155A (Vaisala, Helsinki, Finland)
		风速 Wind speed	034B (Met-One Instruments, Grants Pass, USA)
		风向 Wind direction	034B (Met-One Instruments, Grants Pass, USA)
		太阳辐射 Solar radiation	CMP3 (Kipp & Zonen, Delft, The Netherlands)
		净辐射 Net radiation	CNR-4 (Kipp & Zonen, Delft, The Netherlands)
		光合有效辐射 Photosynthetically active radiation	PAR-LITE (Kipp & Zonen, Delft, The Netherlands)
		土壤热通量 Soil heat flux	HFP01 (Hukseflux Thermal Sensors, Delft, The Netherlands)
		土壤温度 Soil temperature	ECH2O-5TE (METER Environment, Pullman, USA)
	EM50 (METER Environment, Pullman, USA)	土壤含水量 Soil water content	ECH2O-5TE (METER Environment, Pullman, USA)

观测系统 Measurement system	数据采集器 (制造商) Datalogger (manufacturer)	观测指标 Measured variable	仪器型号 (制造商) Instrument model (manufacturer)
通量观测系统 Flux measurement system	LI-7550 (LI-COR, Lincoln, USA)	大气压 Atmospheric pressure	LI-7200 (LI-COR, Lincoln, USA)
		碳水通量 Carbon and water flux	LI-7200 (LI-COR, Lincoln, USA)
		潜热、显热通量 Latent heat and sensible heat flux	LI-7200 (LI-COR, Lincoln, USA)
		三维超声风速 3D sonic anemometer	CSAT-3 (Campbell, Logan, USA)
气象观测系统 Meteorological measurement system	CR200X (Campbell, Logan, USA)	降雨量 Rainfall	TR-525M (Texas Electronics, Dallas, USA)
	CR3000 (Campbell, Logan, USA)	空气温度 Air temperature	HMP155A (Vaisala, Helsinki, Finland)
		相对湿度 Relative humidity	HMP155A (Vaisala, Helsinki, Finland)
		饱和水汽压差 Vapor pressure deficit	HMP155A (Vaisala, Helsinki, Finland)
		风速 Wind speed	034B (Met-One Instruments, Grants Pass, USA)
		风向 Wind direction	034B (Met-One Instruments, Grants Pass, USA)
		太阳辐射 Solar radiation	CMP3 (Kipp & Zonen, Delft, The Netherlands)
		净辐射 Net radiation	CNR-4 (Kipp & Zonen, Delft, The Netherlands)
		光合有效辐射 Photosynthetically active radiation	PAR-LITE (Kipp & Zonen, Delft, The Netherlands)
		土壤热通量 Soil heat flux	HFP01 (Hukseflux Thermal Sensors, Delft, The Netherlands)
		土壤温度 Soil temperature	ECH2O-5TE (METER Environment, Pullman, USA)
	EM50 (METER Environment, Pullman, USA)	土壤含水量 Soil water content	ECH2O-5TE (METER Environment, Pullman, USA)

数据项 Data item	计量单位 Unit
年 Year	-
月 Month	-
日 Day	-
时 Hour	-
分 Minute	-
潜热通量 Latent heat flux	W·m^-2
显热通量 Sensible heat flux	W·m^-2
总初级生产力 Gross primary productivity	mg C·m^-2·s^-1
生态系统呼吸 Ecosystem respiration	mg C·m^-2·s^-1
生态系统净CO₂交换 Net ecosystem CO₂ exchange	mg C·m^-2·s^-1

数据项 Data item	计量单位 Unit
年 Year	-
月 Month	-
日 Day	-
时 Hour	-
分 Minute	-
潜热通量 Latent heat flux	W·m^-2
显热通量 Sensible heat flux	W·m^-2
总初级生产力 Gross primary productivity	mg C·m^-2·s^-1
生态系统呼吸 Ecosystem respiration	mg C·m^-2·s^-1
生态系统净CO₂交换 Net ecosystem CO₂ exchange	mg C·m^-2·s^-1

数据项 Data item	计量单位 Unit	数据项说明 Description
年 Year	-	年份 Year
月 Month	-	月份 Month
日 Day	-	日期 Day
时 Hour	-	小时 Hour
分 Minute	-	分钟 Minute
空气温度 Air temperature	℃	冠层上方平均空气温度 Mean air temperature above canopy
相对湿度 Relative humidity	%	冠层上方平均相对湿度 Mean relative humidity above canopy
饱和水汽压差 Vapor pressure deficit	kPa	冠层上方饱和水汽压差 Vapor pressure deficit above canopy
大气压 Atmospheric pressure	kPa	大气压强 Atmospheric pressure
风速 Wind speed	m·s^-1	冠层上方风速 Wind speed above canopy
风向 Wind direction	°	冠层上方风向 Wind direction above canopy
太阳辐射 Solar radiation	W·m^-2	太阳总辐射 Total solar radiation
净辐射 Net radiation	W·m^-2	净辐射 Net radiation
光合有效辐射 Photosynthetically active radiation	μmol·m^-2·s^-1	光合有效辐射 Photosynthetically active radiation
土壤热通量 Soil heat flux	W·m^-2	土壤热通量 Soil heat flux
一层土壤(10 cm)温度 10 cm soil temperature	℃	距地表10 cm土壤温度 Soil temperature 10 cm underground
二层土壤(30 cm)温度 30 cm soil temperature	℃	距地表30 cm土壤温度 Soil temperature 30 cm underground
一层土壤(10 cm)含水量 10 cm soil water content	m³·m^-3	距地表10 cm土壤水分 Soil water content 10 cm underground
二层土壤(30 cm)含水量 30 cm soil water content	m³·m^-3	距地表30 cm土壤水分 Soil water content 30 cm underground
降雨量 Rainfall	mm	降雨量 Rainfall