A Spatial Analysis of Land Use Change and Water Quality in Lake Biwa, Japan

Poster prepared for presentation at the Agricultural & Applied Economics Association 2010 AAEA, CAES, & WAEA Joint Annual Meeting, Denver, Colorado, July 25-27, 2010

Katsuya Tanaka and JunJie Wu

“Lake Biwa (670.49 Km2 in surface area) is the largest lake in Japan, formed about 400,000 years ago (Shiga Prefectural Government, 2008). Due to its long history, Lake Biwa is known as one of the oldest twenty lakes in the World. Lake Biwa has a high biodiversity, with approximately 600 animal species and 500 kinds of plants, including 58 endemic species such as Biwa trout.

“This lake is also a valuable water source for 14 million people in Kinki region including three major cities: Kyoto, Osaka, and Kobe. However, due to intensive agriculture and rapid urban development around Lake Biwa, water quality indicators such as chemical oxygen demand (COD) and total organic carbon (TCC) in the lake has declined significantly over the last 30 years.”

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