|Title:||Nitrogen and Phosphorus Contamination of Groundwater in Some Agricultural Area of Taiwan||Other Titles:||部分農業區地下水氮和磷污染現況||Authors:||Chi ling Chen
Chien liang Chu
Chun chiang Lin
Wei tin Huang
|Keywords:||Nitrogen;Phosphorus;Groundwater;Agriculture||Issue Date:||Nov-2008||Start page/Pages:||103-120||Source:||農業試驗所特刊;第134號||Conference:||農業非點源污染研討會論文集||Abstract:||
To understand the current status of nitrogen and phosphorus contamination of groundwater resulting from fertilization on farmland, the history data from monitoring network by Water Resources Agency (WRA) and Environmental Protection Administration (EPA) have been analyzed and with groundwater quality on some agricultural regions sampled and measured. The results reveal quiet high percentages of monitoring wells set by WRA and EPA with NH4+-N contents in groundwater exceeding drinking water quality standard (0.1 mg/l), even higher than the limit of the second type groundwater pollution monitoring standard (0.25 mg/l). Based on the investigation of agricultural regions, the NH4+-N contamination from agricultural area seems similar as that from different land uses monitored by WRA or EPA. There are less 10 % of monitoring wells by WRA or EPA or sampled from agricultural regions of which NO3-N contents are higher than the limit of drinking water and exceeding the limit of drinking water quality standard (10 mg/l). However, no data higher than the limit of the second type groundwater pollution monitoring standard (25 mg/l) are observed. There is no significant correlation between the N content in groundwater and soil profile texture. However, the N contamination has been getting gradually higher on some agricultural region located in head recharge area of Choshui alluvial fan with few mud layers in the geological profile, even the soil texture is clay. One of the reasons might be attributed to heavy rate of fertilization by local farmers and need to be further confirmed in the future. The results also indicate almost the total P is much lower than limit of the groundwater quality standards (0.15 mg/l) stipulated by the Netherland.
|Appears in Collections:||農業化學組|
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