Measurements of carbon dioxide and heat fluxes during monsoon-2011 season over rural site of India by eddy covariance technique

Patil, M. N.; Dharmaraj, T.; Waghmare, R.T.; Prabha, Thara V.; Kulkarni, J. R.

doi:10.1007/s12040-013-0374-z

Cited by 16 publications

(9 citation statements)

References 24 publications

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“…Surprisingly, [CO 2 ] measurements at night stand out for their instability, which were especially high during harvest period and not dependent of wind speed or other environmental factors. Such [CO 2 ] instability has been previously described by Patil et al (2014) , who attributed the pronounced CO 2 peaks to the absence of solar radiation and accumulation of CO 2 in unstable boundary layer. Thus, these noisy measurements may lead to unreliable night respiration estimations, again reinforcing the idea that proper buffer volumes are necessary when large plant chambers are used.…”

Section: Discussionsupporting

confidence: 57%

Whole-Plant Water Use in Field Grown Grapevine: Seasonal and Environmental Effects on Water and Carbon Balance

et al. 2018

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Water scarcity is a main challenge in vineyards sustainability in most of the grapevine areas now and even more in near future due to climatic change perspectives. In consequence, water use efficiency (WUE) measurements are of the highest interest to improve the sustainability of this crop. The vast majority of WUE measurements relays on measurements of leaf carbon and water fluxes at leaf-level. However, less data are available at the whole-plant level, and for the moment those data are not totally coincident with conclusions reached at leaf scale. In this study, we used whole-plant chambers able to enclose an entire plant of 12 years old to measure at the same time water and carbon fluxes under realistic field grown conditions. The main objectives were to identify the technical issues interfering the whole-plant measurements and track the environmental and other abiotic factors that can affect water and carbon balance, i.e., WUE at the whole-plant scale. To achieve those objectives, we measured whole-plant water and carbon fluxes in grapevine exposed to two different water regimes at three phenological stages [pea size (July), ripening (August), and harvest (September)]. In September, measurements were repeated under high CO2 to also check its effect at the whole-plant scale. The results indicate that water and carbon fluxes are well coordinated under both water availability treatments. Under drought conditions, both fluxes were drastically reduced, but surprisingly the estimated WUE resulted not improved but decreased, contrarily to what is shown at the leaf scale. The phenology (September) also strongly decreased both water and carbon fluxes when compared to measurements in July. We hypostatized that harvest load respiration rates could have an important weight on the whole-plant net carbon exchange (NCE). Finally, high CO2 measurements, after correction for leaks, indicated an increase of whole-plant NCE as well as increased whole-plant WUE, as expected. Several technical issues were identified, like 1/instability of [CO2] during the night period that prevent robust estimation of whole-plant respiration and 2/condensation during last night and sun-rise hours which may affect the estimation of daily plant transpiration.

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Section: Discussionsupporting

confidence: 57%

Whole-Plant Water Use in Field Grown Grapevine: Seasonal and Environmental Effects on Water and Carbon Balance

et al. 2018

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“…Weather and climate change on Earth are not only driven by the amount and distribution of solar radiation (Trenberth et al 2009), but are also influenced by terrestrial ecosystemic processes, such as the exchanges of energy, CO 2 , and water between land surfaces and the atmosphere (Pielke et al 1998;Patil et al 2014). Investigating exchanges of energy and CO 2 under a variety of terrestrial ecosystems is thus very important for understanding the mechanisms that control these exchanges.…”

Section: Introductionmentioning

confidence: 99%

Energy and CO2 exchanges and influencing factors in spring wheat ecosystem along the Heihe River, northwestern China

Sun

Shao

Gao³

2016

J Earth Syst Sci

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Spring wheat (Triticum aestivum Linn.) is an important crop for food security in the desert-oasis farmland in the middle reaches of the Heihe River in northwestern China. We measured fluxes using eddy covariance and meteorological parameters to explore the energy fluxes and the relationship between CO 2 flux and climate change in this region during the wheat growing seasons in 2013 and 2014. The energy balance closures were 70.5% and 72.7% in the 2013 and 2014 growing season, respectively. The wheat ecosystem had distinct seasonal and diurnal dynamics of CO 2 fluxes with U-shaped curves. The accumulated net ecosystemic CO 2 exchanges (NEE) were −111.6 and −142.2 g C/m 2 in 2013 and 2014 growing season, respectively. The ecosystem generally acted as a CO 2 sink during the growing season but became a CO 2 source after the wheat harvest. A correlation analysis indicated that night-time CO 2 fluxes were exponentially dependent on air temperature and soil temperature at a depth of 5 cm but were not correlated with soil-water content, water-vapour pressure, or vapour-pressure deficit. CO 2 flux was not correlated with the meteorological parameters during daytime. However, irrigation and precipitation, may complicate the response of CO 2 fluxes to other meteorological parameters. Keywords. Eddy covariance; energy and CO 2 fluxes; desert-oasis ecotone; spring wheat.

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“…A deciduous forest in north India has a cumulative NEE of − 860 gC m −2 during a 9-month-long study from January to September [113]. Patil et al [82] report that a rural site in south India (16° 44′ N, 77°59′ E) acts as a net carbon sink during the Indian summer monsoon months in 2011. In a study over China, the annual carbon cycles of a subtropical evergreen broadleaf forest in subtropical monsoon humid climate (23°10′ N, 112°31′ E) and a tropical seasonal rainforest in humid subtropical climate (21°56′ N, 101°16′ E) have been compared by Yan et al [119].…”

Section: Discussionmentioning

confidence: 99%

The effect of Indian summer monsoon on the seasonal variation of carbon sequestration by a forest ecosystem over North-East India

et al. 2020

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The Indian summer monsoon is one of the most important yet less understood synoptic processes on the Earth, characterized by an increased amount of rainfall over the entire Indian landmass. The different types of forest ecosystems existing over the Indian region offer a tremendous carbon sequestration potential useful for the global mitigation of climate change as predicted by the modelling studies. The monsoon results in a strong seasonality of the ecosystematmosphere carbon exchange due to the differential availability of two key controlling parameters of photosynthesis namely radiation and water. However, due to the sparsity of surface observations neither the carbon sequestration potential of these ecosystems nor its relation with the monsoon has been analysed comprehensively so far. This paper studies the ecosystem-atmosphere CO 2 exchange at a tropical semi-evergreen moist deciduous forest and its relation with the monsoon over northeast India using the eddy covariance and associated meteorological measurements. In 2016, this ecosystem acts as a net source of atmospheric CO 2 with net ecosystem exchange of 207.51 ± 157.37 gC m −2 year −1 and gross photosynthesis and ecosystem respiration of 2604.88 ± 179.43 and 2812.38 ± 22.05 gC m −2 year −1 , respectively. The monsoon clouds are seen to introduce a bimodal pattern in the annual GPP record. The pre-monsoon and winter are the most and least favourable seasons for the photosynthetic CO 2 uptake by this forest canopy. Additionally, the rate of increase of photosynthesis with evapotranspiration is maximum and minimum during the pre-monsoon and winter, respectively.

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Measurements of carbon dioxide and heat fluxes during monsoon-2011 season over rural site of India by eddy covariance technique

Cited by 16 publications

References 24 publications

Whole-Plant Water Use in Field Grown Grapevine: Seasonal and Environmental Effects on Water and Carbon Balance

Whole-Plant Water Use in Field Grown Grapevine: Seasonal and Environmental Effects on Water and Carbon Balance

Energy and CO2 exchanges and influencing factors in spring wheat ecosystem along the Heihe River, northwestern China

The effect of Indian summer monsoon on the seasonal variation of carbon sequestration by a forest ecosystem over North-East India

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