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Deciduous trees with compound leaves more tolerant to air pollution: study

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Deciduous trees with compound leaves more tolerant to air pollution: study

~By Dr Aditi Jain

Degrading air quality in metro cities is a matter of concern for public health. Massive tree plantation drives are often conducted in order to provide oxygen to choking cities. But trees, much like humans, are also severely affected by pollutants in the air.

In such a situation, knowledge about trees capable of withstanding heavily polluted environment is needed, particularly while designing green belts in urban areas. A new study done by researchers at the Banaras Hindu University (BHU) might help in this regard. The study has deciphered impact of air pollution on health of various trees, and identified trees hardy enough to tolerate stress induced by air pollution.

Deciduous trees with compound leaves more tolerant to air pollution: studyThe researchers selected three regions with a variable degree of pollution levels – residential, traffic and industrial site – in Varanasi. They found that levels of particulate (total suspended particles, Particulate Matter 10) and gaseous pollutants (nitrous oxide, sulphur dioxide, ozone) were 1.4 to 2.5 times more in the areas with traffic and the industrial site compared to the residential location. The levels of most pollutants were high during winters followed by summers and monsoon months, except ozone which was higher in summers. The study was performed for six successive seasons for two years.

In all, thirteen tree species that were present in all the three sites were selected to study impact of air pollution on them. Around fifteen leaf parameters such as antioxidant status, leaf water status, photosynthetic pigment etc. and tree characteristics were studied at all the sites.

The results showed that particulate matter and ozone were the most damaging to trees, causing maximum variability in their characteristics. Of all the studied trees, Caesalpinia sappan (Indian redwood) was found to be the most tolerant followed by Psidium guajava (yellow guava), Dalbergia sissoo (shisham) and Albizia lebbeck (saras). These tree species showed an increase in antioxidants, pigments and relative water status with increase in pollution load.

Tolerance and pollution response were regulated by different tree characteristics such as height, canopy size, leaf form, texture and nature of the tree. The analysis showed that deciduous trees, with compound leaves, small-to-medium canopy and round-to-oval shape are more tolerant to pollution. The scientists reasoned that as compared to simple leaves, compound leaves are less exposed to air pollutants making trees bearing such leaves more tolerant.

“Identification of relative tolerance of tree species to air pollutants with respect to their leaf functional traits and canopy characteristics could be useful in planning green belt development in cities. Our findings are also useful for urban biodiversity conservation, which will enhance ecosystem services by supporting biodiversity, improving aesthetic appearance and mitigating air pollutant’s burden to reduce human health risk,” said Dr Madhoolika Agarwal,  author of the study, while speaking to India Science Wire.

The results of the study have been published in journal Ecotoxicology and Environmental Safety. The research team included Arideep Mukherjee and Madhoolika Agrawal from the Banaras Hindu University. (India Science Wire)

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Indian-origin astronaut Anil Menon begins first mission to International Space Station

Indian-origin NASA astronaut Anil Menon has launched aboard Soyuz MS-29 on his first mission to the International Space Station, where he is expected to spend around eight months conducting research.

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Indian-origin NASA astronaut Anil Menon has embarked on his first journey into space after successfully launching aboard Russia’s Soyuz MS-29 spacecraft to the International Space Station (ISS).

The mission lifted off from the historic Baikonur Cosmodrome in Kazakhstan at 8:17 PM on Tuesday. Menon was accompanied by Russian cosmonauts Pyotr Dubrov and Anna Kikina as the three-member crew began their expedition to the orbiting laboratory.

Crew to spend about eight months aboard ISS

The Soyuz MS-29 spacecraft is expected to dock with the International Space Station a little over three hours after launch. Once aboard the ISS, the crew will carry out a range of scientific research and technology demonstration projects during their mission.

The expedition is scheduled to last approximately eight months, with the crew expected to return to Earth in 2027 after completing their planned activities in orbit.

Menon’s maiden spaceflight marks a significant milestone in his astronaut career as he joins the International Space Station crew for long-duration research and operational work.

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Astronaut Shubhanshu Shukla to meet PM Modi after return from historic space mission

Astronaut Shubhanshu Shukla, who recently returned from the ISS as part of the Axiom-4 mission, will meet PM Modi this evening. Parliament will also hold a special discussion on his historic journey.

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Subhanshu shukla

Indian astronaut Group Captain Shubhanshu Shukla, the first Indian to visit the International Space Station (ISS), will meet Prime Minister Narendra Modi this evening at his official residence in New Delhi.

PM Modi to host meeting with astronaut

According to officials, the meeting at 7 Lok Kalyan Marg is expected to take place between 5 pm and 5:30 pm. Shukla, who arrived in India on Sunday, will also be part of the National Space Day celebrations scheduled for August 23.

Warm welcome in India

The astronaut was greeted at the airport by his family, Science and Technology Minister Jitendra Singh, Delhi Chief Minister Rekha Gupta, and hundreds of citizens waving the national flag. Shukla had been in the United States for a year, preparing for the Axiom-4 mission, which launched from Florida on June 25 and docked at the ISS the next day. He served as the mission’s pilot.

Emotional note from Shukla

Before his return, Shukla shared an emotional post on Instagram, expressing mixed feelings of leaving his space colleagues while being eager to meet his loved ones and people of India. He also quoted a song from the film Swades, which he had chosen as his anthem on the launch day.

Parliament session on India’s space journey

In honour of Shukla’s mission, the Lok Sabha is holding a special session today to discuss “India’s first astronaut aboard the ISS – critical role of space programme for Viksit Bharat by 2047.” Union minister Kiren Rijiju said the discussion would highlight the importance of India’s space achievements and future goals.

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Shubhanshu Shukla pens emotional note as he returns to India after space mission

Indian astronaut Shubhanshu Shukla penned an emotional Instagram post as he returned to India after his 18-day ISS mission, marking a milestone in India’s space journey.

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Indian astronaut Group Captain Shubhanshu Shukla has shared an emotional Instagram post as he heads back home after completing his 18-day mission aboard the International Space Station (ISS).

Astronaut reflects on mixed emotions

In his heartfelt message, written from the aircraft, Shukla expressed the whirlwind of emotions he felt while leaving behind his fellow astronauts, who had been his family during the mission. “As I sit on the plane to come back to India, I have a mix of emotions running through my heart. I feel sad leaving a fantastic group of people behind who were my friends and family for the past year during this mission. I am also excited about meeting all my friends, family and everyone in the country for the first time post mission. I guess this is what life is — everything all at once,” he wrote.

Acknowledges support and inspiration

The astronaut thanked everyone for the love and support he received throughout his journey. He also recalled the words of his commander Peggy Whitson, saying, “Goodbyes are hard, but we need to keep moving in life. As my commander Peggy Whitson fondly says, ‘The only constant in spaceflight is change’. I believe that applies to life as well.”

Shukla ended his note with a line from the song Yun Hi Chala Chal from the film Swades, reflecting his spirit of resilience.

Link to India’s space ambitions

Shukla’s return comes at a crucial time as India advances its space programme. Prime Minister Narendra Modi had earlier mentioned that the astronaut would soon return and that he was tasked with documenting his training and ISS stay. This record will serve as a valuable reference for Gaganyaan, India’s first human spaceflight mission.

Over the past year, Shukla trained extensively at NASA, Axiom, and SpaceX facilities. His flight to the ISS as part of the Axiom 4 mission marked a milestone in India’s preparations for future human space exploration.

The Gaganyaan project aims to send Indian astronauts into orbit aboard an indigenous rocket. The government has also outlined plans for a Bharatiya Antariksh Station by 2035 and a crewed mission to the moon by 2040.

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