{"id":20109648,"date":"2023-01-15T23:21:00","date_gmt":"2023-01-15T17:51:00","guid":{"rendered":"https:\/\/www.thethirdpole.net\/?post_type=photo_story&p=109648"},"modified":"2023-04-17T21:07:47","modified_gmt":"2023-04-17T15:37:47","slug":"upstream-dams-are-drowning-cambodias-protected-flooded-forest","status":"publish","type":"photo_story","link":"https:\/\/dialogue.earth\/en\/nature\/upstream-dams-are-drowning-cambodias-protected-flooded-forest\/","title":{"rendered":"Upstream dams are drowning Cambodia\u2019s protected flooded forest"},"content":{"rendered":"\n

Kong Chanthy\u2019s face lights up as he reminisces about the past. Thirty years ago, the flooded forest in the middle of the Mekong River in northeast Cambodia, just south of the border with Laos, teemed with life and communities prospered.<\/p>\n\n\n\n

The forest didn\u2019t just provide sustenance for the 13,000<\/a> people who live along the river north of Stung Treng town, says Kong, who is the head of community fisheries and ecotourism in O\u2019Svay commune. It nourished endangered birds and fish, some migrating up the Mekong from Tonle Sap Lake in the country\u2019s northwest \u2013 the largest inland fishery in the world, supplying Cambodians with 60% of their protein. And its shrubs and trees also offered river animals refuge from predators and safe spawning grounds.<\/p>\n\n\n\n

\u201cWe poured salt into the boat [to keep the fish fresh], used lanterns, hit the boat with a paddle and fish just jumped into the boat,\u201d Kong says, remembering night fishing in the 1980s. Kong has spent years researching this unique ecosystem and its fish species for a state research institution and non-governmental groups.<\/p>\n\n\n\n

\n
\n
\"A<\/div>
Thai Sakhan, a farmer with nine children who lives in O\u2019Svay commune, removes leaves from a tree branch cut from the flooded forests. Locals use the leaves of some of the area\u2019s tree species in soups and sauces. (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n<\/div>\n\n\n\n
\n
\"Local<\/div>
Local fishers sometimes also gather fruit from the trees of the flooded forest to use as bait. These plum-like fruits are from the Nauclea orientalis <\/em>tree, which usually grows at the edge of the water. (Image: Andy Ball<\/a> \/ The Third Pole) <\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n
\"A<\/div>
A fisher works between the trees of the flooded forest. This unique ecosystem is not found on any other stretch of the Mekong. (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n\n\n\n

The area\u2019s exceptional biodiversity didn\u2019t go unnoticed. In 1999 the flooded forest was designated a Wetland of International Importance under UNESCO\u2019s Ramsar Convention.<\/p>\n\n\n\n

Covering an area of 14,600 hectares<\/a>, the Ramsar site is an ecosystem that can only be found<\/a> along this 40-kilometre stretch of the Mekong. The forest\u2019s iconic landscape \u2013 strangler figs, with their tentacle-like branches wrapped around massive Anogeissus and Acacia trees \u2013 are adapted to the unique conditions, and attract international tourists. As did a population of freshwater dolphins in a nearby deep pool, the last member of which died last year<\/a>.<\/p>\n\n\n\n

The trees, some as tall as 25 metres, change with the seasonal fluctuations of the river. They lose their leaves as the Mekong swells with monsoon rains and they become submerged. Then when water levels drop during the dry season, typically from October to early May, they dry out and grow new leaves.<\/p>\n\n\n\n

\"Cambodia<\/div>
Dead trees in a section of the flooded forest in December, the middle of the dry season. Researchers say that unseasonably high water levels due to upstream dams in Laos and China releasing their water is preventing the forest from drying out as it should at this time of year, killing the trees. (Image \u00a9 Andy Ball<\/a>)<\/div><\/div><\/div><\/div>\n\n\n\n
\n
\n
\"figs<\/div>
Strangler figs growing on Stung Treng\u2019s large riparian trees (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n<\/div>\n\n\n\n
\n
\"The<\/div>
The skeleton of an Irrawaddy dolphin in Preah Rumkel commune that locals say died in 2021. Until the last individual died in February 2022, Preah Rumkel was one of two sites in Cambodia that attracted tourists to see the dolphins. (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

But in the early 2000s, Kong noticed something strange. The river stopped receding during the dry season. Then the flooded forest started to die. Today, thousands of gnarled, dead trees protrude from the water. \u201cUp to now 70-80% of the forest has died,\u201d Kong says.<\/p>\n\n\n\n

Local fisheries have already been decimated by illegal fishing and dams blocking migratory routes, Kong explains, but the damage being done to this fish habitat has made matters worse. Similarly, tourism has been reeling from the loss of the flooded forest. \u201cWe are suffering,\u201d Kong says. <\/p>\n\n\n\n

\n
\n
\"An<\/div>
An endangered Mekong freshwater stingray at a fish market in Stung Treng town. In June last year, just upstream from here in the Ramsar site, a giant freshwater stingray weighing 300kg was discovered. It hit international headlines as the largest freshwater fish to ever be recorded worldwide. This much smaller stingray may have been killed when inadvertently caught in a fisher\u2019s nets. (Image \u00a9 Andy Ball<\/a>)<\/div><\/div><\/div><\/div>\n<\/div>\n\n\n\n
\n
\"Illegal<\/div>
Illegal electrical fishing gear, motorbikes, boats and engines, all confiscated by rangers, sit in a storage unit at the Stung Treng Ramsar site\u2019s headquarters (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

All the local people who spoke to The Third Pole echoed Kong\u2019s observations. They talked about the devastation that has accompanied the decline of the forest, from decreasing bird and fish populations, to the damage being done to other habitats like the sandbars associated with the forest. Many said they haven\u2019t seen certain fish species for years. And many blamed the unusual rises in water levels on the Don Sahong dam, which is just four kilometres<\/a> north of the protected Ramsar site in southern Laos.<\/p>\n\n\n\n

Cumulative impacts<\/h2>\n\n\n\n

Ian Baird, professor of geography at the University of Wisconsin-Madison in the United States, agrees that the flooded forest is in trouble. Baird lived in the area during the 1990s and went back to investigate the demise of the forest in May 2022, finding that 40-50% of its tall trees had died. He says the cause is the high-volume dams in China and Laos, which store water during the monsoon season and release it in the dry season to generate electricity.<\/p>\n\n\n\n

\u201cThere\u2019s been a lot of discussion about cumulative [dam] impacts, but there are very few very good examples where you could see it,\u201d Baird says. The Stung Treng flooded forest, he says, is one of them. Baird is, however, at pains to make clear that the Don Sahong dam on its own does not have the capacity to store enough water to affect the river\u2019s flow. Instead, he says the damage to the forest is being caused by the combined operation of several dams on the Mekong and its tributaries.   <\/p>\n\n\n\n

\"The<\/div>
The 260 MW Don Sahong hydropower dam in southern Laos, in October 2022. Construction of the dam began in 2016, and it started operating in 2020. (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n\n\n\n

More than 150 dams<\/a> have so far been built in the Mekong basin, spanning China, Myanmar, Thailand, Laos, Cambodia and Vietnam. This includes 13 dams<\/a> straddling the Mekong\u2019s mainstream \u2013 11 in China, where the river is called the Lancang, and two in Laos. In China, the Xiaowan and the Nuozhadu dams \u201chold more than 50% of the total storage capacity [of dams] in the Mekong basin\u201d,  according to<\/a> US-based thinktank the Stimson Center.<\/p>\n\n\n\n

The majority of these dams have been built since the turn of the century. Xiaowan and Nuozhadu started operation in 2008 and 2012 respectively.<\/p>\n\n\n\n

\"Mekong<\/div>
<\/div><\/div><\/div><\/div>\n\n\n\n

The rise in water levels observed by local people is reflected in data from the Mekong River Commission<\/a> (MRC), an intergovernmental advisory body involving Thailand, Vietnam, Laos and Cambodia that coordinates on the development of water-related resources in the lower Mekong basin. Measurements taken over the past 100 years in Pakse<\/a>, southern Laos, clearly show that water levels during the dry season have been rising over the past 15 years, Baird said during an online lecture<\/a> in November 2022.<\/p>\n\n\n\n

In response to questions from The Third Pole, the MRC Secretariat acknowledged that the release of water from upstream dams \u201ccould create higher dry season flow\u201d, adding that \u201cthe impact decreases further downstream and does not become so obvious at Stung Treng\u201d.<\/p>\n\n\n\n

The secretariat did not confirm if it has raised the issue of the dying forest with Laos and China, but said the current condition of wetlands in the lower Mekong basin will be addressed in its 2023 report. On preserving wetlands, the secretariat said it is working with its four member states plus China and Myanmar on tracing \u201coriginal cause(s) that affect water levels and volume in a way that exceeds a maximum acceptable level\u201d.<\/p>\n\n\n\n

\"A<\/div>
A recently fallen dead tree in the Stung Treng flooded forest. Research by Professor Ian Baird of the University of Wisconsin-Madison has found that 40-50% of the Ramsar site\u2019s tall trees have now died. (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n\n\n\n

China is not an MRC member and does not directly inform downstream nations about its hydropower projects. According to Brian Eyler, director of the Stimson Center’s Southeast Asia Program: \u201cChina’s 12th dam on the Mekong mainstream is nearly complete. The only way we know this is via satellite imagery provided by platforms like the Mekong Dam Monitor.\u201d<\/p>\n\n\n\n

There is, however, some cooperation. In 2020, climatologists claimed<\/a> that upstream Mekong dams in China were limiting the water flow during the rainy season, exacerbating<\/a> the effects of droughts in Cambodia, Thailand, Laos and Vietnam. Following this, in October 2020 China agreed<\/a> to share year-round water data with the MRC.<\/p>\n\n\n\n

The future of Stung Treng\u2019s flooded forest<\/h2>\n\n\n\n

Chhoun Chhorn, the provincial environment department\u2019s deputy director for the Stung Treng Ramsar site, is not aware of any steps being taken by Cambodia\u2019s Ministry of Environment \u2013 which did not respond to The Third Pole\u2019s request for comment \u2013 other than discussions to replant flooded forest trees. \u201cWe are in the process of looking for partners,\u201d he says. \u201cAs you are aware, we don\u2019t have the budget. We need to plant trees that can survive the geography [of the flooded forest].\u201d<\/p>\n\n\n\n

The trees typically<\/a> attach themselves to the rocky riverbed in the middle of the Mekong rapids, so have to be both tough and lucky.<\/p>\n\n\n\n

Sai Fang, chief of Koh Cheu Teal Touch village, within the Ramsar site, also thought about planting trees to save the forest and his community. But after long deliberation he reached the conclusion that \u201creplanting trees is impossible\u201d. Mostly, he says, because fluctuating water levels mean the growing trees are frequently submerged.<\/p>\n\n\n\n

The 60-year-old grandfather has come to see moving away from the area as the only solution, especially for the young. \u201cLivelihoods were better before because people could catch fish for sale on a daily basis. Now they can\u2019t catch fish,\u201d he says. \u201cOnly migration can help people make a living.\u201d<\/p>\n\n\n\n

\"Carp<\/div>
Carp, which are known to consume the flooded forest\u2019s fruits and leaves, for sale in Stung Treng town. The fish migrate up the Mekong from Tonle Sap and on into Laos. \u00a0(Image \u00a9 Andy Ball<\/a>)<\/div><\/div><\/div><\/div>\n\n\n\n
\n
\n
\"Construction<\/div>
Construction workers lay concrete on the eighth floor of a block of flats in Cambodia\u2019s capital Phnom Penh. The country\u2019s construction sector is booming, with many workers migrating from the countryside to earn money. (Image \u00a9 Andy Ball<\/a>)<\/div><\/div><\/div><\/div>\n<\/div>\n\n\n\n
\n
\"A<\/div>
A worker sprays a mixture of fertiliser and pesticides on banana trees in Cambodia\u2019s Kampot province. Plantations like this are another draw for rural migrants. (Image \u00a9 Andy Ball<\/a>)<\/div><\/div><\/div><\/div>\n<\/div>\n<\/div>\n\n\n\n

Men and women from Sai\u2019s village as well as others in the Stung Treng area have been searching for a better life elsewhere in Cambodia, or even further afield. Often they work as labourers on plantations and construction sites, or in beauty salons and restaurants in the capital Phnom Penh. Others end up as domestic workers in far-flung places like Saudi Arabia, or toil in factories in neighbouring Thailand.<\/p>\n\n\n\n

Sai\u2019s own granddaughters, aged 19 and 22, travelled to Thailand in February 2022 to help the family make ends meet. Recruited by neighbours who were already in the country, they were promised domestic work.<\/p>\n\n\n\n

\u201cWe feel sad because they\u2019ve been there for months and haven\u2019t sent any money,\u201d the village chief says. \u201cThey keep changing employers because the employers are bad.\u201d<\/p>\n\n\n\n

\"Chief<\/div>
Chief Sai Fang in his home in Koh Cheu Teal Touch village. His two granddaughters travelled to Thailand early last year in search of domestic work. As fisheries collapse in the area, many young people are leaving to find alternative ways of making a living. (Image: Andy Ball<\/a> \/ The Third Pole)<\/div><\/div><\/div><\/div>\n\n\n\n

Additional reporting and translation by Vutha Srey. This article was reported with the support of the Pulitzer Center\u2019s Rainforest Journalism Fund.<\/em><\/p>\n\n\n\n

All images can be republished as part of the article, but those credited with a copyright symbol cannot be used independently of it. Credit information should not be changed.<\/em> <\/p>\n","protected":false},"excerpt":{"rendered":"

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Dead trees stand in the Mekong as part of a previously living section of flooded forest. Researchers say that unusually high water levels during the dry season, as a result of upstream dams in Laos and China releasing the water, are preventing the forests from drying out, and therefore killing them. Credit: Andy Ball"},{"@type":"BreadcrumbList","@id":"https:\/\/dialogue.earth\/en\/nature\/upstream-dams-are-drowning-cambodias-protected-flooded-forest\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/dialogue.earth\/en\/"},{"@type":"ListItem","position":2,"name":"Upstream dams are drowning Cambodia\u2019s protected flooded forest"}]},{"@type":"WebSite","@id":"https:\/\/dialogue.earth\/en\/#website","url":"https:\/\/dialogue.earth\/en\/","name":"Dialogue Earth","description":"Global climate and environment news","publisher":{"@id":"https:\/\/dialogue.earth\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/dialogue.earth\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en"},{"@type":"Organization","@id":"https:\/\/dialogue.earth\/en\/#organization","name":"\u5bf9\u8bdd\u5730\u7403","url":"https:\/\/dialogue.earth\/en\/","logo":{"@type":"ImageObject","inLanguage":"en","@id":"https:\/\/dialogue.earth\/en\/#\/schema\/logo\/image\/","url":"https:\/\/dialogue.earth\/content\/uploads\/2024\/04\/Dialogue-Earth-Symbol-Logo_Black-Text.png","contentUrl":"https:\/\/dialogue.earth\/content\/uploads\/2024\/04\/Dialogue-Earth-Symbol-Logo_Black-Text.png","width":256,"height":256,"caption":"\u5bf9\u8bdd\u5730\u7403"},"image":{"@id":"https:\/\/dialogue.earth\/en\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/twitter.com\/DialogueEarth_","","https:\/\/www.facebook.com\/DialogueEarth.English","https:\/\/www.instagram.com\/dialogue.earth\/","https:\/\/www.linkedin.com\/company\/dialogueearth\/"],"publishingPrinciples":"https:\/\/dialogue.earth\/en\/about\/"}]}},"_links":{"self":[{"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/photo_story\/20109648","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/photo_story"}],"about":[{"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/types\/photo_story"}],"replies":[{"embeddable":true,"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/comments?post=20109648"}],"version-history":[{"count":0,"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/photo_story\/20109648\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/media\/20109748"}],"wp:attachment":[{"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/media?parent=20109648"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/categories?post=20109648"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/tags?post=20109648"},{"taxonomy":"country","embeddable":true,"href":"https:\/\/dialogue.earth\/en\/wp-json\/wp\/v2\/country?post=20109648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}