[Characteristics of phosphorous losses in surface runoff and sediment under different land use in west Tiaoxi catchment].
Five typical land covers in West Tiaoxi catchment were studied on phosphorous loss in artificial rainstorm runoff. Triple duplication experiments were carried out under the artificial rain condition with intensity of 2 mm.min-1 lasting 32 minutes in 3 m2 plot. Transportation and flux of various species of phosphorous in runoff and sediments were investigated. The results showed that phosphorous losses amount and rate were different among five types of land covers. The loss of total phosphorous in runoff of mulberry garden was the largest, which was five times higher than that of paddy and pinery field. The majority of total phosphorous in runoff was particulate phosphorous. Losses of dissolved phosphorous in vegetable plots and mulberry gardens were much higher than bamboo plot and paddy field. Loss of dissolved inorganic phosphorous in runoff was the main part of dissolved phosphorus, which pinery was much higher than others. Total amounts of phosphorous loss from top 10 cm layer of 5 kinds of soils were estimated as high as 2.57-4.89 g.m-2, of which phosphorous loss through sediment of runoff accounted for more than 97%. The rate of total phosphorous losses were ranged in 0.45-4.11 mg.(m2.min)-1 in runoff, which was much lower than that of 72.82-135.96 mg.(m2.min)-1 in sediment of runoff.
Liang
Tao
T
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Wang
Hao
H
Zhang
Shen
S
Zhang
Xiumei
X
Yu
Xingxiu
X
D002681:China; D019015:Geologic Sediments / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D011891:Rain; D012987:Soil / Q000032:analysis*; D014872:Water Movements
D012987:Soil; D010758:Phosphorus