Forests

What India can learn from failure of European forests to mitigate climate change

Replacing native species of natural forests with exotic ones reduces their effectiveness as carbon sinks

 
By Ajay Kumar Saxena
Last Updated: Tuesday 16 February 2016 | 09:31:56 AM

Native broad-leaved species were replaced by non-native conifer species in the afforestation drive in European forests (Photo courtesy: Doronenko, CC BY 3.0, Wikipedia Commons)

A new study published in the journal Science has shown that forests can function as effective carbon sinks only when sustainable forest management practices are followed. The study has claimed that more than 250 years of wood extraction and other unsustainable practices in European forests had led to the accumulation of 3.1 billion metric tonnes of carbon debt despite considerable afforestation. This afforestation drive, which favoured non-native conifer species over native broad-leaved species, caused these forests to fail at addressing the challenges of climate change.

The study reconstructed the land-use history of Europe from 1750 to examine the effects of these changes on the climate. It says that while deforestation removed nearly 200,000 square kilometres of forest cover in Europe between 1750 and 1850, subsequent reforestation efforts not only made up for the losses, but actually resulted in a net gain in Europe’s overall forest cover during the study period.

But the study also noted that these reforestation efforts mainly favoured conifer trees over broad-leaved species which had dominated the European landscape earlier. This resulted in an increase in the conifer species cover by over 633,000 square kilometres, while broadleaf species cover decreased by 436,000 square kilometres.

Replacing broad-leaved forests with conifers had another unintended warming effect. Since conifer leaves tend to be darker than broad-leaved ones, it resulted in an increase in the absorption of sunlight, adding to global warming. The study adds that conifers are more conservative with water, which leads to less evapotranspiration, and to drier air which further contributed to a warming effect on climate. Overall, air temperature over the forests increased by an average of about 0.12°C during the study period. Another observation made by the study was that in the past 250 years, approximately 85 per cent of Europe’s forests came under human management and have remained under practices such as wood extraction, thinning and litter raking, reducing the climate efficacy of afforestation.

“European forests have failed to realise a net (CO2) removal from the atmosphere, and this is due to the fact that humans extracted wood from unmanaged forests by bringing these forests under management,” says the study’s lead author Kim Naudts, a researcher with the University of Versailles’ Climate and Environmental Sciences Laboratory. “Even a well-managed forest today stores less carbon than its natural counterparts in 1750.”

The study concludes that forest management in Europe over the past 250 years has not been climate-friendly. The researchers involved in the study suggest that “the political imperative to mitigate climate change through afforestation and forest management…risks failure, unless it is recognised that not all forestry contributes to climate change mitigation”.

However, not all experts agree with the authors’ harsh conclusions. They argue that using forests as a climate change mitigation tool is a new approach, one that did not exist for the majority of this study period. They also say that the way the study was designed (studying the blanket effects of a period from 1750 till today) is incompatible with the fact that more recent forest management techniques have borne better results and claim that they have had a positive mitigation effect in Europe in the 1950s.

Lessons for India

The findings of this study are relevant to natural forests in India which have been subjected to large-scale species conversion over past several decades. For instance, vast stretches in the Himalayas have been converted to monocultures of conifers such as pines and cedars mainly during the British colonial rule. These species are not only exotic but they also provide fewer non-timber forest products (NTFPs) or other ecosystem services to local people. They have also been found ineffective in soil and moisture conservation when compared to native broad-leaved species such as oak and rhododendron.

But Indian governments and foresters have not yet learned their lessons and continue to promote monocultures and plantation of exotic species in natural forests. Recent guidelines issued by the Ministry of Environment, Forest and Climate Change (MoEF&CC) are also problematic since they propose handing over of open forests and natural scrub areas of the country for captive plantations by wood-based industries. Monoculture plantations over these forestlands will create large-scale ecological, economic and social problems while frequent commercial harvests of unnatural species will further reduce the climate effectiveness of our forests, as suggested by the study.

Subscribe to Weekly Newsletter :

Related Blog:

Indigenous tree species can meet growing demand for wood

Related Story:

World’s forests continue shrinking, but at a slower pace: FAO report

Global production of wood products registers growth

Dense forests lost; increase in net green cover: Forest Survey of India 2015

India commits to restore 13 million ha of degraded forest under Bonn Challenge

Now web tool can help us to estimate forest biomass and carbon stocks

IEP Resources:

Europe’s trees have been warming the planet

Carbon sequestration in managed temperate coniferous forests under climate change

Bet-hedging dry-forest resilience to climate-change threats in the western USA based on historical forest structure

Net carbon uptake has increased through warming-induced changes in temperate forest phenology

We are a voice to you; you have been a support to us. Together we build journalism that is independent, credible and fearless. You can further help us by making a donation. This will mean a lot for our ability to bring you news, perspectives and analysis from the ground so that we can make change together.

Comments are moderated and will be published only after the site moderator’s approval. Please use a genuine email ID and provide your name. Selected comments may also be used in the ‘Letters’ section of the Down To Earth print edition.

  • Interesting article. It is quite important to take into account all sorts of disadvantages of conifers. However I am bit confused about their role in increasing air temperature. If they release less water i.e. there should be less water vapour in the air surrounding them. Water vapour in fact is very important green house gas. So how does reducing transpiration leads to temperature rise?

    Posted by: Suvarna Punalekar | 2 years ago | Reply
    • As mentioned, the conifers have darker leaves than broad-leaved ones, absorbing more sunlight and adding to warming. On water front, I still need to find clear relation from study. But I think it is due to overall global effects and continental air circulations.

      Thanks for feedback.

      Posted by: Ajay | 2 years ago | Reply