[Phosphorus loss potential of soil-water in sites of the main rice-yield area in the Northern Zhejiang].
Phosphorus (P) loss potential and its environmental impact from soil-water were surveyed in Jiashan Yuyao, Deqing and Yuhang, named main rice-yield areas in Northern Zhejiang province China. High P input has resulted in soil P accumulation. Higher soil Olsen-P contributed its bio-available P, water extracted P and increased soil P loss potential. The role of P in paddy soils is of environmental rather than agronomic concern in the process of soil P build-up. During the no-rice time, total P (TP) concentration in the various water including ditch drain inside/outside field, field surface water and pipe drain et al are over the critical values associated with accelerated waters eutrophication. The average proportion of dissolved reactive P (DRP) concentration in TP was 40%, however, these current DRP levels in partly ditch drain outside field and surface or ground water in no-rice time could not caused serious impact to the outside waters nearby rice-yield agriculture area. No significant line correlation between soil P tests and P in field surface water was found in no-rice time due to differences in field tillage among rice-yield areas, while P application increased both soil P and its correspondingly field surface P level after rice was planted at the same time.
Zhang
Z
Z
College of Science of Environment and Natural Resources, Zhejing University, Hangzhou 310029, China. zhangajq@sohu.com
Wang
K
K
Zhu
Y
Y
Guo
M
M
Zhou
S
S
D012275:Oryza; D010758:Phosphorus / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D014867:Water / Q000032:analysis*
D012987:Soil; D014867:Water; D010758:Phosphorus