Controversial study finds intensive farming partnered with strict protected areas is best for biodiversityJeremy Hance
September 01, 2011
Tropical forest in Ghana, an irreplaceable habitat for many species. Photo courtesy of Ben Phalan.
While many factors are behind the decline in global species, the biggest is habitat loss, with natural ecosystems usually losing out to agricultural expansion. This situation has led to a debate among researchers known as "land sparing versus land sharing". Land sparing argues the best way to conserve species is to set aside as much intact ecosystems as possible, while intensively growing crops on remaining land. Land sharing, however, argues that agriculture should forgo industrialization and become more biodiversity-friendly, allowing species to survive in a mix of forests and less-impact agriculture. According to the new study, land sparing achieves a better result for biodiversity than seeing land as both a reservoir for agriculture and species.
"It would be nice to think that we could conserve species and produce lots of food, all on the same land," said study author, Malvika Onial from the University of Cambridge, in a press release. "But our data from Ghana and India show that's not the best option for most species. To produce a given amount of food, it would be better for biodiversity to farm as productively as possible, if that allows more natural habitat to be protected or restored."
Researchers argue that high-yielding oil palm plantations like this one in Ghana could potentially help the country to meet its food needs without clearing more forests. As an intensive monoculture, palm oil plantations harbor little biodiversity and have been blamed for vast deforestation across Southeast Asia. Image courtesy of Ben Phalan.
The results, they say, were unambiguous: species would have the largest populations—and therefore be the furthest from extinction—if farming was kept to a minimal amount of land growing high yields, while natural habitat was set aside. The results worked both for rare and common species.
"Farmland with some retained natural vegetation had more species of birds and trees than high-yielding monocultures of oil palm, rice or wheat but produced far less food energy and profit per hectare," explains lead author Dr Ben Phalan from the University of Cambridge. "As well as requiring more land to produce the same amount of food, the 'wildlife-friendly' farmlands were not as wildlife-friendly as they first appeared. Compared with forest, they failed to provide good habitat for the majority of bird and tree species in either region."
However, the authors caution that their study should not be taken as one-size-fits-all, since it only looked at two regions—southwest Ghana and northern India—and two types of species, birds and trees.
Still with these findings in hand, the researchers conclude that India and Ghana "could produce more food with minimal further negative impacts on forest species if they were to implement ambitious programs of forest protection and restoration alongside sustainable increases in agricultural yield, but they could not if they adopted land sharing."
William Laurance, a tropical forest scientist with James Cook University, told mongabay.com that the study makes a good point, although there are caveats.
Coffee beans in Sao Tome and Principe islands.
The authors of the study agree with Laurance that their results are "not enough to argue that land sparing is the optimal strategy for reconciling food production and biodiversity conservation everywhere and for all taxa," according to their paper. But they argue that similar studies should be conducted elsewhere to strike the right balance between land sharing and land sparing.
However, not every researcher believes that this debate is the right one for biodiversity or for feeding the world. Ivette Perfecto, who has spent her career studying how farmers can work with nature instead of against it, says that focusing on land sharing versus land sparing entirely misses the point on global hunger.
"The problem of hunger and starvation in the world is largely a consequence of access to food that is already available, and increasing per hectare productivity especially in large-scale monocultures is not likely to change this problem, which is fundamentally a socioeconomic and political one," Perfecto told mongabay.com, adding that, "the need to feed the world should not be used as an excuse to continue with an agricultural model that degrades the environment and has failed to eliminate hunger in the world."
Satellite image of southwest Ghana, showing remaining forests (dark green) and land which has been cleared for agriculture (bright green). The paper by Phalan et al. examines how food production might be increased in this region with the least harm to biodiversity. The width of the image is around 200 km. Image by NASA.
She says that when it comes to hunger and biodiversity, small-scale farms that practice agroecology—applying ecological principles to growing crops—have in fact been shown as incredibly effective, both in tackling food problems and preserving species and ecosystem services.
"Food production in smallholder farms is the key to food security and to the conservation of biodiversity. Increasing food production locally, where the poor live, can be accomplished using agroecological methods that can promote biodiversity both within farming systems and at the landscape level," says Perfecto, who adds that industrial agriculture does not necessarily mean other land will be spared, instead her research has shown that industrial agriculture "frequently leads to more deforestation and loss of biodiversity." In other words large-scale commercial agriculture simply begets more large-scale commercial agriculture, devastating ecosystems and species in the process.
Study author, Rhys Green from the Royal Society for the Protection of Birds (RSPB) and the University of Cambridge, says that their Science study is not meant to grant carte blanche to industrialized agriculture.
"High-yielding organic farming and other systems such as agroforestry can be a useful component of a land sparing strategy and may offer the additional advantage of fewer adverse effects of farming from fertilizers and pesticides," he admits. "But whatever the farming system, protection of natural habitats will continue to be essential for the conservation of many species."
But Perfecto argues that the land sparing argument tacitly accepts the need for large-scale industrialized agriculture.
"The land sparing/land sharing debate is a false debate proposed by those who wish to justify the continuation of industrial agriculture," she told mongabay.com "Those of us that 'argue for 'land sharing'' or wildlife-friendly farming recognize the importance of maintaining natural habitat and argue that there is no need to destroy more natural habitat in order to produce enough food to feed the world."
Comments from Ben Phalan, lead author of the study after the article was published: I’d like to respond to some of the criticisms here. We agree that solving hunger is about far more than increasing food production. But it is food production which affects biodiversity. Our conclusion that land sparing would be a better option than land sharing holds even if total production could be frozen or substantially reduced (see figure 2 of our paper). Therefore, arguing against our conclusion on the grounds that total production could be frozen or cut does not stack up.
We have no wish to “justify the continuation of industrial agriculture.” Look at our past publications: what we are concerned about is how biodiversity conservation can be more effective. Our results persuade us that – at least in southwest Ghana and northern India – the conservation potential of land sharing is more limited than often recognised. Land sparing is not about business-as-usual, but needs to be radical and innovative, and might often involve smallholder farmers.
Organic farm in Indonesian Borneo. Photo by: Rhett A. Butler.
Village, rice fields, and forest in Madagascar. Photo by: Rhett A. Butler.
Intensive agriculture meets natural habitat: soy fields and the Amazon rainforest in Brazil. Photo by: Rhett A. Butler.
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