Greenhouse gas emissions from different land-use areas in the Littoral Zone of the Three Gorges Reservoir, China

Lu, Peili; He, Yixin; Peng, Shuchan; Yue, Junsheng

doi:10.1016/j.ecoleng.2017.01.003

Cited by 20 publications

(12 citation statements)

References 38 publications

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“…Cumulative fluxes of GHGs (Table 5) showed that CO 2 emission dominated the GHG fluxes when the CH 4 and N 2 O fluxes were calculated as CO 2 equivalents during the growing season, which is comparable to the results archived in Audet et al (2013) and Zhou et al (2017). Litter from soil surface, root residues and exudates in splits are the main source of soil organic matter in terrestrial ecosystems (Gleixner, 2005;Gonzalez-Meler et al, 2018).…”

Section: The Contribution Of Cultivation To Ghg Emissionssupporting

confidence: 84%

Greenhouse gas emissions from riparian zone cropland in a tributary bay of the Three Gorges Reservoir, China

Wang

Huang

et al. 2020

PeerJ

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Background.A huge reservoir was formed by the Three Gorges Dam in China, which also formed a riparian zone along the bank of the reservoir. In the period of low waterlevel, the riparian zone in tributary bays of the Three Gorges Reservoir (TGR) was always unordered cultivated, owing to its gentle slope and high soil fertility. This landuse practice creates high potential of generating greenhouse gas (GHG) emissions with periodic water level fluctuation. Methods. To evaluate potential GHG emissions from the soil-air interface, the static opaque chamber method was adopted to evaluate the effect of elevations (180 m, 175 m, 170 m and 165 m) and land use types (dry lands, paddy fields and grass fields) from April to September in 2015 and 2016. Results. The results showed that carbon dioxide (CO 2 ) was the main contributor of GHG emission in riparian zone most likely because of high organic carbon from residues. Furthermore, high soil water content in paddy fields resulted in significantly higher methane (CH 4 ) flux than that in dry lands and grass fields. Compared to grass fields, anthropogenic activities in croplands were attributed with a decrease of soil total carbon and GHG emissions. However, inundation duration of different elevations was found to have no significant effect on CH 4 and CO 2 emissions in the riparian zone, and the mean nitrous oxide (N 2 O) flux from dry lands at an elevation of 165 m was significantly higher than that of other elevations likely because of tillage and manure application. The high N 2 O fluxes produced from tillage and fertilizer suggested that, in order to potentially mitigate GHG emissions from the riparian zone, more attention must be paid to the farming practices in dry lands at low elevations (below 165 m) in the riparian zone. Understanding factors that contribute to GHG emissions will help guide ecological restoration of riparian zones in the TGR. . 2017. Characteristics and influencing factors of CH 4 emissions from the drawdown Area of the Three Gorges reservoir. Environmental Science 38(10):4370-4379 (in Chinese). Chen N, Chen Z, Wu Y, Hu A. 2014. Understanding gaseous nitrogen removal through direct measurement of dissolved N 2 and N 2 O in a subtropical river-reservoir system. Ecological Engineering 70(5):56-67

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Section: The Contribution Of Cultivation To Ghg Emissionssupporting

confidence: 84%

Greenhouse gas emissions from riparian zone cropland in a tributary bay of the Three Gorges Reservoir, China

Wang

Huang

et al. 2020

PeerJ

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“…We found that most studies measure diffusive CH 4 fluxes, only. Ponds and wetlands have the highest diffusive CH 4 emissions per square meter on the Three Gorges Floodplain during reservoir drawdown (Table ), meaning that recent expansion of ponds for aquaculture on the Three Gorges Floodplain is likely increasing diffusive CH 4 emissions (Li et al, ; Zhang et al, ; Zhou et al, ). Grasslands, forests, and agricultural lands measured by other studies on the Three Gorges Floodplain were also sources for diffusive CH 4 to the atmosphere.…”

Section: Discussionmentioning

confidence: 99%

“…Water storage in the Three Gorges Reservoir increases to 175 m a.s.l. from September to February, submerging most of the reserve (Zhou et al, ; Figure c). We repeated sampling at the same study sites on the submerged floodplain following inundation by the Three Gorges Reservoir.…”

Section: Methodsmentioning

confidence: 99%

“…The Three Gorges Floodplain covers 321 km 2 or just under one third of the reservoir's area (Zhang et al, ). Studies by Chen, Wu, et al (), Chen, Yuan, et al (), Zhao et al (), Zhu et al (), Li et al (), and Zhou et al () have quantified diffusive CH 4 , CO 2 , and N 2 O fluxes in the region. However, none have measured diel fluxes and CH 4 ebullition during both reservoir drawdown and inundation on the Three Gorges Floodplain.…”

Section: Introductionmentioning

confidence: 99%

“…The Three Gorges Floodplain is increasingly targeted by displaced farmers for pond aquaculture in attempts to supplement agricultural productivity during reservoir drawdown (Li et al, ; Zhang et al, ; Zhou et al, ). Globally, ponds less than 1,000 m 2 are hot spots for CH 4 and CO 2 emissions (Holgerson & Raymond, ).…”

Section: Introductionmentioning

confidence: 99%

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Magnitudes and Drivers of Greenhouse Gas Fluxes in Floodplain Ponds During Drawdown and Inundation by the Three Gorges Reservoir

Miller

Chen

et al. 2019

JGR Biogeosciences

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Hydropower reservoirs are well-known emitters of greenhouse gases to the atmosphere. This is due in part to seasonal water level fluctuations that transfer terrestrial C and N from floodplains to reservoirs. Partial pressures and fluxes of the greenhouse gases CH 4 , CO 2 , and N 2 O are also a function of in situ biological C and N cycling and overall ecosystem metabolism, which varies on a diel basis within inland waters. Thus, greenhouse gas emissions in hydropower reservoirs likely vary over seasonal and diel time scales with local hydrology and ecosystem metabolism. China's Three Gorges Reservoir is among the largest and newest in the world, with a floodplain that encompasses approximately one third of the reservoir area. We measured diel partial pressures and fluxes of greenhouse gases in ponds on the Three Gorges Floodplain. We repeated these measurements on the submerged floodplain following inundation by the Three Gorges Reservoir. During reservoir drawdown, CH 4 ebullition comprised 60-68% of emissions from floodplain ponds to the atmosphere. Using linear mixed effects modeling, we show that partial pressures of CH 4 and CO 2 and diffusive CO 2 fluxes in floodplain ponds varied on a diel basis with in situ respiration. Floodplain inundation by the Three Gorges Reservoir significantly moderated areal CH 4 diffusion and ebullition. Diel pCO 2 , pCH 4 , pN 2 O, and diffusive fluxes of CO 2 on the submerged floodplain were also driven by in situ respiration. The drawdown/inundation cycle of the Three Gorges Reservoir therefore changes the magnitudes of aquatic greenhouse gas fluxes on its floodplain.

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The convergence of species composition along the drawdown zone of the Three Gorges Dam Reservoir, China: implications for restoration

Zheng

Arif

Zhang

et al. 2021

Environ Sci Pollut Res

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Greenhouse gas emissions from different land-use areas in the Littoral Zone of the Three Gorges Reservoir, China

Cited by 20 publications

References 38 publications

Greenhouse gas emissions from riparian zone cropland in a tributary bay of the Three Gorges Reservoir, China

Greenhouse gas emissions from riparian zone cropland in a tributary bay of the Three Gorges Reservoir, China

Magnitudes and Drivers of Greenhouse Gas Fluxes in Floodplain Ponds During Drawdown and Inundation by the Three Gorges Reservoir

The convergence of species composition along the drawdown zone of the Three Gorges Dam Reservoir, China: implications for restoration

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