大宝山矿水外排的环境影响 ⅱ. 农业生态系统（The environmental impact of Dabaoshan Mine Drainage, agricultural ecological system.）.docVIP

大宝山矿水外排的环境影响 ⅱ. 农业生态系统（The environmental impact of Dabaoshan Mine Drainage, agricultural ecological system.） Environmental impacts of water efflux in Dabao mine: II. Agricultural ecosystem In 2, Lin 1, Lu Wenzhou 1, Wu Yonggui 1, dragon Jie 1, Nie Chengrong 1 1. 、 School of resources and environment, South China Agricultural University, Guangdong 510642, Guangzhou, China 2., School, of, Environmental, Science, and, Management, Southern, Cross, University, Lismore, NSW,, Australia Abstract: Dabaoshan efflux of acid mine water with serious negative effects on agricultural ecosystem in the surrounding rural areas in the farmland irrigation water acidity is very strong, many kinds of heavy metal content in irrigation water is higher than the national standards for irrigation water quality, which exceed the standard Cd about 16 times; serious soil acidification, the pH value can be as low as 3.9, the actual average total acidity reached 47 mmol/kg solution, 147 times higher acidity than water, that inorganic acid by mine water into the soil through soil buffering temporarily into the non water soluble and accumulated in soil; soil heavy metal content exceed the standard, with Zn, Cu and Cd; heavy metal pollution of grain crops and fruits and vegetables and other serious, among which Cd is the most prominent, the highest can exceed the standard of nearly 150 times. Keywords: acid mine water efflux; heavy metals; irrigation; soil pollution; crops; CLC number: X820.3, document identification code: A, article number: 1672-2175 (2005) 02-0169-04 Previous studies by [1] show that the acid water from the outer column of Dabao mountain caused severe damage to the aquatic ecosystems that accepted the ore, water and river. This paper will discuss the influence of the acid mine water on the agricultural ecosystem in the surrounding rural areas. 1 materials and methods The farmland of Bashang village, new town, Wengyuan County, located about 16 km downstream of the barrier dam is ch