Energy balance and partition in Inner Mongolia steppe ecosystems with different land use types

Chen, Shiping; Chen, Jiquan; Lin, Guanghui; Zhang, Wenli; Miao, H.; Long, Wuqiang; Huang, Jianhui; Han, Xingguo

doi:10.1016/j.agrformet.2009.06.009

Cited by 144 publications

(92 citation statements)

References 27 publications

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“…The EBR results for the Skukuza eddy covariance system, which vary between 0.76 and 1.09 with an annual mean of 0.93 (only the years with high-quality data), are generally within the reported accuracies as shown in most studies that report the energy balance closure error at 10-30 %, across different ecosystems. For instance, Wilson et al (2002) also recorded an annual mean EBR of 0.84, ranging between 0.34 and 1.69 in an extensive study investigating 22 FLUXNET sites across the globe; EBR in ChinaFLUX sites ranged between 0.58 and 1.00, with a mean of 0.83 (Yuling et al, 2005); according to Were et al (2007), EBR values of about 0.90 were found over shrub and herbaceous patches in a dry valley in southeast Spain, whereas Chen et al (2009) showed a mean of 0.98 EBR for their study in the semi-arid region of Mongolia, and an EBR value of 0.80 was found by Xin and Liu (2010) in a maize crop in semi-arid conditions, in China. Using data from the Tibetan Observation and Research Platform (TORP), Liu et al (2011) observed an EBR value of 0.85 in an alfalfa field in semi-arid China.…”

Section: Surface Energy Balance Assessmentmentioning

confidence: 99%

“…net radiation minus soil heat flux, is equal to the sum of the turbulent fluxes (Rn − G = LE + H); however, in most instances, the measured available energy is larger than the sum of the measured turbulent fluxes of sensible heat and latent heat. Extensive research on the issue of surface energy imbalance in EC observations has been done (Barr et al, 2012;Chen et al, 2009;Foken et al, 2010;Franssen et al, 2010;Mauder et al, 2007), and closure error (or imbalance) has been documented to be around 10-30 % (Wilson et al, 2002;von Randow et al, 2004;Sánchez et al, 2010).…”

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confidence: 99%

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Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Majozi

Mannaerts

Ramoelo

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Flux towers provide essential terrestrial climate, water, and radiation budget information needed for environmental monitoring and evaluation of climate change impacts on ecosystems and society in general. They are also intended for calibration and validation of satellite-based Earth observation and monitoring efforts, such as assessment of evapotranspiration from land and vegetation surfaces using surface energy balance approaches.In this paper, 15 years of Skukuza eddy covariance data, i.e. from 2000 to 2014, were analysed for surface energy balance closure (EBC) and partitioning. The surface energy balance closure was evaluated using the ordinary least squares regression (OLS) of turbulent energy fluxes (sensible (H) and latent heat (LE)) against available energy (net radiation (Rn) less soil heat (G)), and the energy balance ratio (EBR). Partitioning of the surface energy during the wet and dry seasons was also investigated, as well as how it is affected by atmospheric vapour pressure deficit (VPD), and net radiation.After filtering years with low-quality data (2004)(2005)(2006)(2007)(2008), our results show an overall mean EBR of 0.93. Seasonal variations of EBR also showed the wet season with 1.17 and spring (1.02) being closest to unity, with the dry season (0.70) having the highest imbalance. Nocturnal surface energy closure was very low at 0.26, and this was linked to low friction velocity during night-time, with results showing an increase in closure with increase in friction velocity.The energy partition analysis showed that sensible heat flux is the dominant portion of net radiation, especially between March and October, followed by latent heat flux, and lastly the soil heat flux, and during the wet season where latent heat flux dominated sensible heat flux. An increase in net radiation was characterized by an increase in both LE and H, with LE showing a higher rate of increase than H in the wet season, and the reverse happening during the dry season. An increase in VPD is correlated with a decrease in LE and increase in H during the wet season, and an increase in both fluxes during the dry season.

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Section: Surface Energy Balance Assessmentmentioning

confidence: 99%

mentioning

confidence: 99%

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Majozi

Mannaerts

Ramoelo

et al. 2017

Hydrol. Earth Syst. Sci.

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“…The grassland ecosystem, one of the most widespread arid and semiarid vegetation forms, occupies 20 % of the global terrestrial area and plays an important role in the global carbon cycle (Scurlock and Hall 1998), water cycle (Hu et al 2009), and energy balance (Chen et al 2009a). China has the second largest area of grassland in the world covering 3.92 million km 2 or about 16.3 % of the global grassland area (Fan et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Comparison of evapotranspiration components and water-use efficiency among different land use patterns of temperate steppe in the Northern China pastoral-farming ecotone

Fan

et al. 2015

Int J Biometeorol

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Water-use efficiency (WUE), which links carbon and water cycles, is an important indicator of assessing the interactions between ecosystems and regional climate. Using chamber methods with and without plant removal treatments, we investigated WUE and evapotranspiration (ET) components in three ecosystems with different land-use types in Northern China pastoral-farming ecotone. In comparison, ET of the ecosystems with grazing exclusion and cultivating was 6.7 and 13.4 % higher than that of the ecosystem with free grazing. The difference in ET was primarily due to the different magnitudes of soil water evaporation (E) rather than canopy transpiration (T). Canopy WUE (WUEc, i.e., the ratio of gross primary productivity to T) at the grazing excluded and cultivated sites was 17 and 36 % higher than that at the grazing site. Ecosystem WUE (WUEnep, i.e., the ratio of net ecosystem productivity to ET) at the cultivated site was 34 and 28 % lower in comparison with grazed and grazing excluded stepped, respectively. The varied leaf area index (LAI) of different land uses was correlated with microclimate and ecosystem vapor/carbon exchange. The LAI changing with land uses should be the primary regulation of grassland WUE. These findings facilitate the mechanistic understanding of carbon-water relationships at canopy and ecosystem levels and projection of the effects of land-use change on regional climate and productivity.

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“…In Xilinhot, which is located at the northern edge Soils of the study site are divided into chestnut or chernozem soil, according to the UN Food and Agriculture Organization (FAO) classification. In Xilinhot, which is located at the northern edge of the Chinese pastoral farming ecotone, grazing is the primary land-use pattern [27,28]. There are also two alternative land uses of the steppe in the region: grazing-exclusion steppe and steppe reclaimed to cropland.…”

Section: Study Areamentioning

confidence: 99%

“…Based on the CUE definition and Re composition mentioned above, it likely that the Ra intensity and its proportion of Re play a critical role in ecosystem CUE regulation. Meanwhile, it has already been determined that the vegetation structure and characteristics, biomass and respiration and their composition are usually substantially changed under different management patterns [6,27]. However, it remains uncertain how and to what extent the grassland-use patterns changes would influence the regional ecosystems CUE in the North China steppes.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Carbon-Use Efficiency Among Different Land-Use Patterns of the Temperate Steppe in the Northern China Pastoral Farming Ecotone

Fan

2018

Sustainability

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Carbon-use efficiency (CUE) is the proportion of gross primary production converted to net primary production. Changes to CUE strongly influence ecosystem carbon budgets and turnover. Little is known about the response of ecosystem CUE to human-induced land-use change, which limits the accurate evaluation of the environmental influence of large-scale steppe-use changes in northern China. We investigated the components of ecosystem carbon exchange and CUE under three typical steppe-use patterns in Xilinhot, Inner Mongolia. The results showed that CUE in grazing and grazing-excluded steppe were not significantly different (both over 0.7) but were significantly higher than in cultivated steppe (0.57). Ecosystem respiration and its components, including autotrophic respiration (Ra), aboveground respiration, heterotrophic respiration and belowground respiration showed significant negative correlation with CUE. Ra is the most important factor explaining the variation of CUE between different steppe-use patterns (p < 0.001, 97%); Ra change may be the primary factor driving CUE variation between steppe-use patterns. Leaf area index of different grassland-use patterns also showed a significant negative correlation with CUE (p < 0.001, 91%). These findings may help to improve accurate prediction of the environmental and climatic consequences of large-scale land-use change.

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Energy balance and partition in Inner Mongolia steppe ecosystems with different land use types

Cited by 144 publications

References 27 publications

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Analysing surface energy balance closure and partitioning over a semi-arid savanna FLUXNET site in Skukuza, Kruger National Park, South Africa

Comparison of evapotranspiration components and water-use efficiency among different land use patterns of temperate steppe in the Northern China pastoral-farming ecotone

Comparison of Carbon-Use Efficiency Among Different Land-Use Patterns of the Temperate Steppe in the Northern China Pastoral Farming Ecotone

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