生物质炭施用对杉木幼苗土壤磷组分的影响

通过盆栽试验,采用Hedley连续浸提法研究不同生物质炭施用量处理(CK:0 t/hm2;B12:12 t/hm2;B36:36 t/hm2)对杉木幼苗土壤磷组分的影响.结果表明:与CK相比,试验180 d后B12和B36处理土壤全磷与有效磷含量分别增加了8.7％～26.0％ 和24.0％～101.7％,有效磷在全磷中...

Effects of Biochar Application on Soil Phosphorus Fractions of Cunninghamia lanceolata Seedlings

Using the Hedley sequential extraction method, the effects of biochar application rate on soil phosphorus (P) fractions of Cunninghamia lanceolata seedlings with a pot experiment were evaluated. Three biochar application rate treatments were performed with 0 (CK), 12 t/hm²(B₁₂), 36 t/hm²(B₃₆). Results indicated that the contents of total P (TP) and available P (AP) in B₁₂ and B₃₆ treatments were increased by 8.7%-26.0% and 24.0%-101.7% in relation to CK after 180 days, and the proportion of AP in TP also was significantly increased. Among P fractions, residual P represented 48.5%-51.1% of soil TP and 58.7%-68.3% of soil inorganic P. B₃₆ treatment significantly increased the contents of inorganic P fractions, and the proportion of labile P and moderately labile P as inorganic P forms, while significantly reduced the percentage of occluded P and residual P to inorganic P. The proportion of moderately labile P in total organic P was the highest, accounting for 69.3%-70.2%. Biochar application had no significant influence on the proportion of organic P fractions in total organic P, and B₃₆ treatment significantly decreased the contents of labile P and moderately labile P as organic P forms. Redundancy analysis revealed that soil total carbon was significantly positively correlated with soil inorganic P and negatively correlated with soil organic P, which was the key factor influencing the changes of soil P fractions.