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采用盆栽试验研究三峡库区消落带土壤在不同施磷水平下莴笋对磷肥的吸收利用及各形态无机磷的吸收变化。结果表明,随着磷肥施用量的等梯度增加,与不施磷肥的处理2(NP0K)相比,莴笋产量显著增加,增产达78%~174%,表明在施用相同氮、钾肥的基础上,增施磷肥可使莴笋增产;不同施磷水平下,养分含量表现为茎全磷含量高于叶全磷含量,茎磷含量随着施磷水平增加而逐渐增大,其中以处理9(NP210K)含量13.3g/kg最高,高出处理2(NP0K)的60%,而叶全磷含量各处理间无明显差异,可见,大量施用磷肥明显提高植株地下部分磷素的含量;而不同施磷水平下,莴笋叶的养分吸收量均大于茎吸收量,处理3(NP30K)到9(NP210K)不同施磷水平下的茎、叶磷吸收量均明显高于处理2(NP0K),表明在一定肥料比例下,磷肥的适量增加有助于莴笋吸磷量的升高;通过不同施磷水平下,各形态无机磷含量与有效磷含量、生物量的关系及各处理间无机磷含量的变化得知,三峡库区消落带土壤,各无机磷形态的生物有效性表现为Fe-P>Ca2-P>Al-P>Ca8-P>O-P、Ca10-P。
Pot experiments were conducted to study the absorption and utilization of phosphate fertilizer and the absorption of inorganic phosphorus by lettuce in different soil phosphorus levels in the hydro-fluctuation belt of the Three Gorges Reservoir area. The results showed that the yield of lettuce was significantly increased and the yield was increased by 78% ~ 174% compared with the no NP 2 treatment (P <0.05), which indicated that with the same nitrogen and potassium fertilizers applied, Phosphorus fertilizer increased the yield of lettuce. Under different phosphorus levels, the content of total phosphorus in the stem was higher than that of the total phosphorus in the stem, and the content of phosphorus in the stem increased gradually with the increase of the phosphorus application. The content of NP210K was 13.3 g / kg was the highest, which was 60% higher than that of NPK. However, there was no significant difference in the total phosphorus content between the treatments. It can be seen that phosphorus application significantly increased the content of phosphorus in the underground parts of the plants. However, (P <0.05), the uptake of phosphorus in stems and leaves of treatments 3 (NP30K) to 9 (NP210K) was significantly higher than that of treatments 2 (NP0K), indicating that under a certain fertilizer ratio, The increase of appropriate amount of phosphorus helps increase lettuce phosphorus uptake; through the different phosphorus levels, the form of inorganic phosphorus content and available phosphorus content, biomass and inorganic phosphorus content of the changes between the treatment that the Three Gorges Reservoir Area Soil in the upwelling zone, the bioavailability of inorganic phosphorus forms Fe-P> Ca2-P> Al-P> Ca8-P> O-P, Ca10-P.