Effects of silicon fertilizer and biochar on active silicon components in Phyllostachys edulis forest soil
[Objective]This study aims to investigate the impact of applying silicon fertilizer and biochar on water-soluble silicon,bioavailable silicon,organically bound silicon,iron-manganese oxide bound silicon,amorphous silicon(biogenic and pedogenic),and total silicon mass fraction in Phyllostachys edulis forest soil,and analyze the relationship between soil water-soluble silicon,soil active silicon components and soil characteristics.[Method]Based on the factorial design,4 treatments were used,including control(S0B0),application of silicon fertilizer at 450 kg·hm-2(S1B0),application of biochar at 10 t·hm-2(S0B1),and combination of silicon fertilizer and biochar(S1B1).[Result]Silicon fertilizer increased bioavailable silicon and iron-manganese oxide bound silicon.The addition of biochar increased the amorphous silicon reservoir(main effect).The combined application of silicon fertilizer and biochar increased the water-soluble silicon in soil.The addition of silicon fertilizer,biochar,and soil depth all changed the composition of soil active silicon and promoted their mutual transformation.There was a highly significant positive correlation between soil organic carbon mass fraction and soil active silicon component(P=0.002).In addition,the addition of silicon fertilizer could directly and indirectly improve soil water-soluble silicon,mediate the conversion of soil silicon components,and improve the solubility of soil active silicon pools.The addition of biochar improved the accumulation of water-soluble silicon in soil.On the one hand,it increased botanical silicon.On the other hand,it increased soil pH and the mass fraction of amorphous silicon in soil formation,and regulated the distribution of soil silicon in each component.[Conclusion]The application of silicon fertilizer and biochar promotes the accumulation of active silicon in soil and changes their mutual conversion in P.edulis forest,but the transformation pathways are different.[Ch,4 fig.5 tab.41 ref.]
万方数据
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