摘要
ＤｙｎａｍｉｃｓｏｆｒｙｅｇｒａｓＰｉｎｒｅｄｓｏｉｌｓＸｉＨａｉＦｕ，ＺｈａｎｇＱｉｎＺｈｅｎｇ，ＹｅＱｉｎｇＦｕ，ＷｕＧａｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＮｕｃｌｅａｒＡｇｒｉｃｕｌｔｕｒａｌＳｃｉｅｎｃｅｓ，ＺｈｅｊｉａｎｇＡｇｒｉｃｕｌｔ...
An investigation on the dynamics of transformation of P from 32 P labelled ryegrass in red soils was conducted in laboratory. The results showed that the rapid increase in flush 32 P related with biomass P was accompanied with the decrease in extractable 32 P on the first 3 d of incubation in both sandy and clayey soils, and afterwards, it displayed great fluctuation in sandy soil, but had little fluctuation in clayey soil during 3～20 d of incubation. At the later stage of incubation, the increase in extractable 32 P was accompanied with decrease in flush 32 P. The opposite changes in content of extractable 32 P and flush 32 P suggested transformation of ryegrass P was closely related to its utilization and its release from microorganisms in red soils. It can be concluded that addition of organic matter accelerated the release of soil native P according to the changes in the extractable soil P during incubation.
关键词
红色土壤
^32P示踪
麦草
动力学
P labelled ryegrass, Extractable P, Microbial transformation of ryegrass P, Red soils
