Impact of Salinity Intrusion on Rice Productivity in the Vietnamese Mekong Delta

Khải, Huỳnh Việt; Dang, Nguyen Huu; Yabe, Mitsuyasu

doi:10.5109/1911216

Cited by 9 publications

(7 citation statements)

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“…4.3.3.6.1 Coastal agriculture SLR will affect agriculture mainly through land submergence, soil and fresh groundwater resources salinisation, and land loss due to permanent coastal erosion, with consequences on production, livelihood diversification and food security, especially in heavily coastal agriculture-dependent countries such as Bangladesh (Khanom, 2016). Recent literature confirms that salinisation is already a major problem for traditional agriculture in deltas (Wong et al, 2014;Khai et al, 2018) and low-lying island nations where some edible cultivated plants such as taro patches are threatened (Nunn et al, 2017b). Taking the case of rice cultivation, recent works emphasise the prevailing role of combined surface elevation and soil salinity, such as in the Mekong delta (Vietnam; Smajgl et al, 2015) and in the Ebro delta (Spain;Genua-Olmedo et al, 2016), estimating for the latter a decrease in the rice production index from 61.2% in 2010 to 33.8% by 2100 in a 1.8 m SLR scenario.…”

Section: Human Activitiesmentioning

confidence: 99%

Sea Level Rise and Implications for Low-Lying Islands, Coasts and Communities

2022

The Ocean and Cryosphere in a Changing Climate

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This chapter assesses past and future contributions to global, regional and extreme sea level changes, associated risk to low-lying islands, coasts, cities, and settlements, and response options and pathways to resilience and sustainable development along the coast. ObservationsGlobal mean sea level (GMSL) is rising (virtually certain 1 ) and accelerating (high confidence 2 ). The sum of glacier and ice sheet contributions is now the dominant source of GMSL rise (very high confidence). GMSL from tide gauges and altimetry observations increased from 1.4 mm yr -1 over the period 1901-1990 to 2.1 mm yr -1 over the period 1970-2015 to 3.2 mm yr -1 over the period 1993-2015 to 3.6 mm yr -1 over the period 2006-2015 (high confidence). The dominant cause of GMSL rise since 1970 is anthropogenic forcing (high confidence). {4.2.2.1.1, 4.2.2.2} GMSL was considerably higher than today during past climate states that were warmer than pre-industrial, including the Last Interglacial (LIG; 129-116 ka), when global mean surface temperature was 0.5ºC-1.0ºC warmer, and the mid-Pliocene Warm Period (mPWP; ~3.3 to 3.0 million years ago), 2ºC-4ºC warmer. Despite the modest global warmth of the Last Interglacial, GMSL was likely 6-9 m higher, mainly due to contributions from the Greenland and Antarctic ice sheets (GIS and AIS, respectively), and unlikely more than 10m higher (medium confidence). Based on new understanding about geological constraints since the IPCC 5th Assessment Report (AR5), 25 m is a plausible upper bound on GMSL during the mPWP (low confidence). Ongoing uncertainties in palaeo sea level reconstructions and modelling hamper conclusions regarding the total magnitudes and rates of past sea level rise (SLR). Furthermore, the long (multi-millennial) time scales of these past climate and sea level changes, and regional climate influences from changes in Earth's orbital configuration and climate system feedbacks, lead to low confidence in direct comparisons with near-term future changes. {Cross-Chapter Box 5 in Chapter 1, 4.

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Section: Human Activitiesmentioning

confidence: 99%

Sea Level Rise and Implications for Low-Lying Islands, Coasts and Communities

2022

The Ocean and Cryosphere in a Changing Climate

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“…The DID with the regression specification can be written as:

where Y it represents the outcome variables of interest: total production, productivity, total revenue, and total main input cost. These are considered essential and common indicators used to measure the efficiency of rice cultivation in previous studies [ 13 , 16 , 17 , 30 ]. These outcomes are also known that they are frequently affected by natural disasters that have been shown by previous studies [ 16 , 17 ].…”

Section: Methodsmentioning

confidence: 99%

“…[ 17 ] estimated the decrease in productivity and the increase in input costs of rice-growing households in Soc Trang province - located in the Mekong Delta under the impact of severe intrusion in the 2015/2016 crop year. The results show that households affected by saline intrusion significantly decreased productivity compared to their counterpart in the unaffected area with the same natural environmental conditions and socio-economic characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Effect of saline intrusion on rice production in the Mekong River Delta

Thach,

Lee,

et al. 2023

Heliyon

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“…In Netherlands, 20 well elds were closed and 9 had to lean upon arti cial replenishment owing to the salinization between 1880 and 1992 [4]. In Vietnamese Mekong Delta, rice yield loss was predicted about 2.5-4.05 tons ha − 1 per year due to the saltwater intrusion [5].…”

Section: Introductionmentioning

confidence: 99%

Bacterial Communities of Sediments in a Seawater-Freshwater Transition Zone During the Wet and Dry Seasons in Pearl River Estuary

Huang

Sun

et al. 2021

Preprint

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Seawater intrusion has a detrimental effect on agriculture, industry and human health. One question of particular interest is how the microbial community responds to and reflects seawater intrusion with seasonal variation. The current study explored the seasonal changes in bacterial community composition and interaction in the vicinity of Pearl River Estuary in January (dry season) and September (wet seasons). Results indicated that the salinity (expressed as electrical conductivity value) of sediment samples obtained in dry season was higher than that in wet season. The salt stress induced a declined alpha diversity but resulted in a loosely connected and unstable biotic interaction network in the bacterial communities. Random forest prediction and redundancy analysis of bacterial community indicated that salinity substantially affected the bacterial communities. Multiple lines of evidence, including the enrichment of bacterial taxa in the high-salinity location, microbe-microbe interactions, environment-microbe interactions, and machine learning approach, demonstrated that the families Moraxellaceae and Planococcaceae were the keystone taxa and were resistant to salt stress, which suggested that both of them can be used as potential biological indicators of monitoring and controlling seawater intrusion in coastal zone areas.

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Impact of Salinity Intrusion on Rice Productivity in the Vietnamese Mekong Delta

Cited by 9 publications

References 0 publications

Sea Level Rise and Implications for Low-Lying Islands, Coasts and Communities

Sea Level Rise and Implications for Low-Lying Islands, Coasts and Communities

Effect of saline intrusion on rice production in the Mekong River Delta

Bacterial Communities of Sediments in a Seawater-Freshwater Transition Zone During the Wet and Dry Seasons in Pearl River Estuary

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