In order to study the effects of straw and waste application on the soil aggregates and soil carbon

nitrogen and phosphorus in the riverside jasmine garden in Fuzhou

the distribution and stability of soil aggregates

including ＞0.25 mm soil aggregates (DR0.25)

mean weight diameter (MWD)

geometric mean diameter (GMD)

fractal dimension (D)

and the content and stoichiometric ratio of soil carbon

nitrogen and phosphorus of 0—10

10—20 and 20—30 cm soil layers were examined in the control (C)

straw (S)

straw+gypsum (SG)

straw+biochar (SB)

straw+slag (SS) amendments plots. The results showed that 0.053～0.25 and 0.25～2 mm particles were the predominant contributor. Compared with the control

DR0.25

MWD and GMD under the straw treatments decreased by 19.86%

19.18%

and 37.98%

respectively

whie D increased by 14.26%

and aggregate stability decreased. Compared with the straw amendment plots

in the straw+gypsum

straw+biochar

straw+slag treatments plots

both DR0.25 and MWD varied slightly

and GMD increased by 2.34%

0.63%

and 12.67%

respectively

whereas

D was reduced by 2.31%

6.26%

and 5.01% respectively

furthermore

aggregate stability also increased. Compared with control

in the straw

straw+gypsum

straw+biochar

straw+slag treatments plots

carbon

nitrogen and phosphorus content were significantly increased in 0—10 cm soil

however

those in 10—20 and 20—30 cm soil layers varied slightly

showing the accumulation of nutrients to the surface soil layer. In all

the results indicating that biochar and slag can be taken as the combination amendments with straw returning to improve the effect of straw returning.