Most Popular Posts
Categories
- Biodiversity (45)
- Climate change (137)
- Community-based conservation (45)
- Economics and conservation (113)
- Endangered species (185)
- Fresh water (41)
- Habitat (158)
- Invasive species (76)
- Marine (103)
- Monitoring (198)
- Restoration (133)
- Socio-political issues (148)
- Tools and technology (91)
Archives
- June 2010
- May 2010
- April 2010
- March 2010
- February 2010
- January 2010
- December 2009
- November 2009
- October 2009
- September 2009
- August 2009
- July 2009
- April 2009
- January 2009
- August 2008
- July 2008
- June 2008
- May 2008
- April 2008
- March 2008
- February 2008
- January 2008
- December 2007
- November 2007
- October 2007
- September 2007
- August 2007
- July 2007
- June 2007
- May 2007
- April 2007
- March 2007
- February 2007
- January 2007
Nov
10
2009
Ancient Chinese road construction method preserves cliff ecosystems
A technique used to build cliff paths during China’s Qin Dynasty could protect Buy viagra online legally, fragile ecosystems against the damage usually caused by mountain road development, scientists report in Landscape and Urban Planning.
Cliffs can house unique communities of trees, lichens, birds, and small animals. Oregon OR Ore. , But human encroachment onto mountainous regions is “eliminating species from these sites even as scientists discover them,” the team writes.
To preserve these natural habitats, generic viagra, Kjøpe viagra, China has turned to an ancient road construction method called cantilevering that was practiced around 200-300 BC. During that time, lowest price viagra, Cheap viagra no prescription, engineers built hundreds of kilometers of cliff paths by inserting wooden beams into holes in the mountainside, covering the beams with planks, cheap viagra without prescription, Buy viagra online legally, and propping up the road from below with additional supports if necessary.
The same technique, updated with modern materials, ostaa halvalla viagra, Buy viagra online cheap, was recently used to rebuild a mountain road in China’s Hubei Province. Researchers monitored eight cliff sites during three years of construction and found that, αγοράσετε viagra έκπτωση, Købe viagra, on average, only 11.1 square meters of vegetation was damaged at each location, pharmacie viagra bon marché. Vermont VT Vt. , In contrast, the conventional construction method of creating a tunnel and filling in the slope below the road would have caused an average of 362 square meters of damage per site, cheap generic viagra, Comprare viagra sconto, they estimate.
The ancient technique also required moving 97.8 percent less sand and soil than the conventional method, lowering the likelihood of erosion and the impact on nearby rivers and streams, viagra online. A cantilevered road with underlying supports was 17.4 percent cheaper than a conventional road, and a cantilevered road without supports was 85.6 percent cheaper, the authors write, buy viagra online legally. Nevada NV Nev. , If adopted, they say, buy viagra without prescription, Viagra cheap, the technique could not only protect biodiversity but preserve the stunning mountain views valued by tourists. – Roberta Kwok
Source: Cao, Illinois IL Ill. , Louisiana LA , S., Ye, New York NY N.Y. , Arizona AZ Ariz. , H., & Zhan, buy viagra cod, Virginia VA Va. , Y. (2009). Cliff roads: An ecological conservation technique for road construction in mountainous regions of China Landscape and Urban Planning DOI: 10.1016/j.landurbplan.2009.10.007
Image © scionxy, iStockPhoto.com
.
Similar posts: Cheap viagra from india. Viagra prescription. Order viagra online without prescription. Buy soma c.o.d.. Price of viagra. Buy viagra cheap.
Trackbacks from: Buy viagra online legally. Buy viagra online legally. Buy viagra online legally. Buy viagra online legally. Buy viagra online legally. Buy viagra online legally.
Filed Under Biodiversity, Habitat, Tools and technology |
Email This Post