English हिन्दी
Connect with us

Latest Science News

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

Published

on

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)

Latest Science News

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.

Published

on

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.

Continue Reading

India News

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.

Published

on

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.

Continue Reading

Latest Science News

Shubhanshu Shukla becomes second Indian in space, lifts off for ISS aboard Axiom-4 mission

Group Captain Shubhanshu Shukla becomes the second Indian astronaut to travel to space after four decades, aboard the Axiom-4 mission to the International Space Station.

Published

on

subhanshu shukla

Group Captain Shubhanshu Shukla of the Indian Air Force has etched his name in history as the second Indian astronaut to travel to space. Launching aboard the SpaceX Crew Dragon on the Axiom-4 mission, Shukla began his journey from NASA’s Kennedy Space Center in Florida, from the very launchpad that propelled Neil Armstrong’s Apollo 11 moon mission in 1969.

Four decades after Wing Commander Rakesh Sharma became the first Indian to journey into space in 1984, Shukla’s mission marks a monumental milestone for India’s space ambitions. Speaking ahead of the mission, Shukla expressed the emotional weight of the moment, saying, “I carry with me not just instruments and equipment, but the hopes and dreams of a billion hearts.”

A multinational crew on a scientific journey

Group Captain Shukla is joined by Commander Peggy Whitson from the US, Slawosz Uznanski-Wisniewski from Poland, and Tibor Kapu from Hungary. The four-member crew is on a mission to the International Space Station (ISS), where they are scheduled to arrive after a 28-hour journey and dock around 4:30 pm tomorrow.

The fortnight-long mission includes the execution of 60 scientific experiments, with seven of them designed by Indian researchers. Shukla is also expected to engage in an interaction with a VIP from space during the mission, adding a special human touch to this scientific voyage.

A mission delayed, but not denied

The Axiom-4 launch had faced multiple delays due to unfavorable weather and technical complications. June 25 finally saw the successful launch, marking NASA’s sixth official date announcement for the mission.

Before lift-off, Shukla shared a heartfelt message with his family: “Just wait for me, I’m coming.” The Indian pilot had been under quarantine for over a month in preparation, ensuring he was in optimal health for the journey.

As the spacecraft orbits Earth en route to the ISS, India watches with pride and anticipation, inspired once again by the courage of its space pioneers.

Continue Reading

Trending

© Copyright 2022 APNLIVE.com