SW—Soil and Water: Nitrogen and Phosphorus Losses due to Soil Erosion during a Typhoon, Japan
✍ Scribed by Machito Mihara
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 167 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0021-8634
No coin nor oath required. For personal study only.
✦ Synopsis
The objectives of this study are to observe soil, nitrogen and phosphorus losses under di!erent amounts of fertilizer during the typhoon of 20 June 1997, and to evaluate the e!ects of soil and nutrient losses associated with the typhoon on the annual loads. Cumulative rainfall of 143)5 mm was recorded during the typhoon of 20 June 1997.
At the onset of surface runo!, the concentration of ammonium nitrogen was dominant among inorganic nitrogen, and gradually decreased with cumulative surface discharge. After 4 h of surface runo!, nitrate nitrogen concentration became higher than that of ammonium nitrogen. According to the loads of nutrient losses, it became clear that the total nitrogen and phosphorus losses in the most fertilized plot (6285 kg ha), were the highest among plots. Additionally, total nitrogen and phosphorus loads during the typhoon ranged from 20 to 49% and from 35 to 45% of the annual loads, respectively. It was concluded that the typhoon largely a!ected the annual nutrient losses.