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通过对贵州黄壤进行采样以及采用无界径流小区法收集地表径流,探索不同利用方式下黄壤旱坡地磷素水平及其地表径流磷浓度的差异。结果表明,不同利用方式下黄壤旱坡地中全磷和有效磷(Olsen-P)含量的大小顺序为连作烟地>烤烟-玉米轮作地>连作玉米地>林地;CaCl_2浸提磷(土壤易解吸磷)和Na0H浸提磷(藻类可利用的土壤总磷)与土壤全磷和有效磷有显著的相关性;土壤富磷化的同时,其磷素的流失风险明显地提高。连作烟地地表径流总磷(TP)和磷酸根态磷(Ortho-P)浓度明显大于连作玉米地.而林地地表径流TP浓度明显小于旱地;黄壤旱坡地地表径流中TP和Ortho-P与土壤有效磷之间存在极显著的相关性(r为0.957、0.875),因而连作烟地磷素的环境影响潜能明显高于其它旱地以及林地。
Through the sampling of yellow soil in Guizhou Province and the collection of surface runoff by the method of unbounded runoff, the differences of phosphorus and its concentration in surface runoff under different utilization patterns were explored. The results showed that the order of total phosphorus and available phosphorus (P) and total phosphorus (P) and available phosphorus (P) in the yellow soil sloping land was continuous cropping> flue-cured tobacco-corn rotation> continuous cropping corn> Phosphorus) and Na0H-leached phosphorus (total available phosphorus in algae) had a significant correlation with total phosphorus and available phosphorus in soil. Phosphorus loss increased significantly when soil was phosphatized. TP and Ortho-P concentrations in surface runoff of continuous cropping tobacco were significantly higher than those in continuous cropping cornland, while the surface runoff TP concentrations in forest land were significantly lower than those in dry land. TP and Ortho-P in surface runoff of yellow soil sloping land were similar to soil There is a very significant correlation between available phosphorus (r = 0.957, 0.875), and thus the potential environmental impact of continuous cropping of phosphorus is significantly higher than that of other drylands and woodland.