Once again, evidence of how very fragile some of our ecosystems are...
From Discovery News
Analysis by Tim Wall
Tue Aug 16, 2011 06:06 AM ET
What do the characters in The Grapes of Wrath, Icelandic shepherds in the Middle Ages and ancient Peruvians have in common? They all suffered from the effects of intensive agriculture on sensitive environments.
Throughout human history unsustainable agricultural practices have turned fragile ecosystems into wastelands and left people starving. During the Dust Bowl, American farmers learned the consequences of removing the deep rooted grasses from the Great Plains when the soil blew away in tremendous dust storms. Icelandic shepherds learned that the sheep rearing practices their ancestors used on the European mainland destroyed the thin soils of their island and left them with starving herds and little to eat.
The ancient inhabitants of what is now Peru also learned the unhappy consequences of farming in a delicate ecosystem. The Ica Valley, near the coast of southern Peru and the famous Nazca lines, is now a barren desert, but was once a fertile floodplain, anchored by the roots of the huarango tree.
People were able to raise a variety of crops there for several centuries. But intensive agriculture in pre-conquest times led to ecosystem collapse. The history of the land was recently reconstructed by bioarcheologist David Beresford-Jones of the University of Cambridge by looking at plant remains left in ancient garbage heaps.
Beresford-Jones and a team of archeologists studied plant remains associated with settlement sites spanning roughly 750 B.C. to 1000 A.D. They observed the change as the valley inhabitants went from eating mostly gathered foods, to a period of intense agriculture, then back again to surviving on what they could eke out of nature's diminished bounty.
"The farmers inadvertently crossed an ecological threshold and the changes became irreversible," says Dr. David Beresford-Jones of the University of Cambridge.
Farming the Ica Valley was possible because of the huarango tree woodland, which literally held the floodplain together. The roots of the tree physically anchored the soils and protected the ground from erosion. The trees also maintained fertility by fixing nitrogen from the air and keeping moisture in the soil.
But as more land was cleared for crop production, so much of the woodland was cleared that the huarango's benefits were lost. The land was then exposed to floods from El Niño events and strong winds parched the land when it wasn't flooded.
Clearing the land of trees in order to grow crops had inadvertently and ironically made it impossible to grow crops.
Earlier residents of the valley had survived largely on land snails, along with sea urchins and mussels gathered from the Pacific coast, an eight-hour walk to the west. The researchers found no evidence of domesticated crops in the refuse heaps, called middens, left by these early inhabitants.
Things started to change around 100 B.C. Remains from crops, including pumpkins, maize, and manioc tubers, began appearing in the garbage heaps. Within a few hundred years there was more intensive agriculture. People added beans, peanuts, and chili peppers to their menus.
The feast didn't last long though. After about 500 years of agriculture, the domesticated crops disappeared. People once again survived on only snails and seafood with some wild plants.
In less than two thousand years, the people went full circle and ended up eating what their ancestors had, but without the huarango forests. To this day, the land is barren, with only the ghostly outlines of irrigation canals to suggest that the land once supported an agrarian society.
Further evidence of the change is found in the disappearance of the use of a blue dye from the indigofera shrub. The shrub grows only in the shelter of huarango trees along waterways. The peoples of the Ica Valley frequently sported clothes dyed a rich blue between 100 and 400 A.D. But as agriculture increased, the use of the dye decreased, suggesting the indigofera's habitat was also disappearing. Seeds from the shrub also became rare in the archeological record.
The indigofera eventually disappeared from the lower Ica Valley, but other plants became more common. Grasses that thrive in open areas became more common as the trees were cut down. Weeds that sprout in soil disturbed by agriculture also became more common.
The study of land use in the Ica Valley was recently published in the journal Vegetation History and Archaeobotany.
The peoples of the Ica Valley are not the only Peruvians to suffer from the effects of deforestation. The hills around Lima, Peru were once covered in huarango trees as well. The trees captured the fog from the ocean and fed local aquifers. But after the Spanish conquest, the trees were cut and the hills went dry.
From Discovery News
Analysis by Tim Wall
Tue Aug 16, 2011 06:06 AM ET
What do the characters in The Grapes of Wrath, Icelandic shepherds in the Middle Ages and ancient Peruvians have in common? They all suffered from the effects of intensive agriculture on sensitive environments.
Throughout human history unsustainable agricultural practices have turned fragile ecosystems into wastelands and left people starving. During the Dust Bowl, American farmers learned the consequences of removing the deep rooted grasses from the Great Plains when the soil blew away in tremendous dust storms. Icelandic shepherds learned that the sheep rearing practices their ancestors used on the European mainland destroyed the thin soils of their island and left them with starving herds and little to eat.
The ancient inhabitants of what is now Peru also learned the unhappy consequences of farming in a delicate ecosystem. The Ica Valley, near the coast of southern Peru and the famous Nazca lines, is now a barren desert, but was once a fertile floodplain, anchored by the roots of the huarango tree.
People were able to raise a variety of crops there for several centuries. But intensive agriculture in pre-conquest times led to ecosystem collapse. The history of the land was recently reconstructed by bioarcheologist David Beresford-Jones of the University of Cambridge by looking at plant remains left in ancient garbage heaps.
Beresford-Jones and a team of archeologists studied plant remains associated with settlement sites spanning roughly 750 B.C. to 1000 A.D. They observed the change as the valley inhabitants went from eating mostly gathered foods, to a period of intense agriculture, then back again to surviving on what they could eke out of nature's diminished bounty.
"The farmers inadvertently crossed an ecological threshold and the changes became irreversible," says Dr. David Beresford-Jones of the University of Cambridge.
Farming the Ica Valley was possible because of the huarango tree woodland, which literally held the floodplain together. The roots of the tree physically anchored the soils and protected the ground from erosion. The trees also maintained fertility by fixing nitrogen from the air and keeping moisture in the soil.
But as more land was cleared for crop production, so much of the woodland was cleared that the huarango's benefits were lost. The land was then exposed to floods from El Niño events and strong winds parched the land when it wasn't flooded.
Clearing the land of trees in order to grow crops had inadvertently and ironically made it impossible to grow crops.
Earlier residents of the valley had survived largely on land snails, along with sea urchins and mussels gathered from the Pacific coast, an eight-hour walk to the west. The researchers found no evidence of domesticated crops in the refuse heaps, called middens, left by these early inhabitants.
Things started to change around 100 B.C. Remains from crops, including pumpkins, maize, and manioc tubers, began appearing in the garbage heaps. Within a few hundred years there was more intensive agriculture. People added beans, peanuts, and chili peppers to their menus.
The feast didn't last long though. After about 500 years of agriculture, the domesticated crops disappeared. People once again survived on only snails and seafood with some wild plants.
In less than two thousand years, the people went full circle and ended up eating what their ancestors had, but without the huarango forests. To this day, the land is barren, with only the ghostly outlines of irrigation canals to suggest that the land once supported an agrarian society.
Further evidence of the change is found in the disappearance of the use of a blue dye from the indigofera shrub. The shrub grows only in the shelter of huarango trees along waterways. The peoples of the Ica Valley frequently sported clothes dyed a rich blue between 100 and 400 A.D. But as agriculture increased, the use of the dye decreased, suggesting the indigofera's habitat was also disappearing. Seeds from the shrub also became rare in the archeological record.
The indigofera eventually disappeared from the lower Ica Valley, but other plants became more common. Grasses that thrive in open areas became more common as the trees were cut down. Weeds that sprout in soil disturbed by agriculture also became more common.
The study of land use in the Ica Valley was recently published in the journal Vegetation History and Archaeobotany.
The peoples of the Ica Valley are not the only Peruvians to suffer from the effects of deforestation. The hills around Lima, Peru were once covered in huarango trees as well. The trees captured the fog from the ocean and fed local aquifers. But after the Spanish conquest, the trees were cut and the hills went dry.
No comments:
Post a Comment