Pedosphere 5(1): 83--92, 1995
ISSN 1002-0160/CN 32-1315/P
©1995 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Nutrient losses in soils on Loess Plateau |
| PENG Lin, WANG Ji-Zeng and YU Cun-Zu |
| Northwestern Institute of Soil, Water Conseruation, Academia Sinica, Yangling 712100 (China) |
| ABSTRACT |
| The soil nutrient losses due to excessive soil loss on Loess Plateau were studied by means of runoff plots and systematical determination of soil nutrients both in sediments and runoff. The results show that the amounts of nutrient losses depended on the amounts of erosion sediments. Along with sediment, 11-197 kg nitrogen/hectare and 9-174 kg phosphorus/hectare were lost, accounting for 92.46-99.47 percent of the total amount of nitrogen loss and 99.85-99.99 percent of the total amount of phosphorus loss respectively. The nutrient losses, very small in runoff, were mainly attributed to erosion of a few rainstorms during a year. The nutrient level in sediment was mostly higher than that in the original soil. Planting grass evidently reduced the losses of soil nutrients. The N level was lower in runoff than in rainfall so that the N loss from runoff could be made up by rainfall. Fertilizer application to crops raised the nutrient level in runoff. |
| Key Words: grass, nutrient losses, runoff, sediments, soils |
| Citation: Peng, L., Wang, J. Z. and Yu, C. Z. 1995. Nutrient losses in soils on Loess Plateau. Pedosphere. 5(1): 83-92. |
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