植物营养与肥料学报2025，Vol.31Issue(4)：709-717,9.DOI:10.11674/zwyf.2024427
高磷条件下追氮时期对水蓼磷积累能力和土壤磷去除潜力的影响
Effects of nitrogen fertilizer topdressing time on the phosphorus-accumulation capacity and soil phosphorus-removal potential of Polygonum hydropiper under phosphorus-enriched soils
摘要
Abstract
[Objectives]Nitrogen(N)fertilization enhances the phytoextraction efficiency of phosphorus(P)by plants.We investigated the effects of N topdressing stages on P accumulation and P removal efficiency in the P-accumulating plant,Polygonum hydropiper,to provide a scientific basis for utilizing N fertilization to promote phytoremediation of soil P excess.[Methods]A soil-based pot experiment was conducted using mining ecotype(ME)and non-mining ecotype(NME)as study materials.Under the condition of N application at 100 mg per kg soil and a base-topdressing N ratio of 1∶1,five topdressing N stages were established,specifically at the 5th,6th,7th,8th,and 9th weeks after transplantation.The treatment without N was used as the control(CK).P was applied at 800 mg per kg soil for all treatments.At 10 weeks after transplanting,the plants were harvested for investigation of biomass,P accumulation,and soil available P concentration.The plant effective number,P extraction ratio,maximum potential yield and maximum potential P removal were calculated.[Results]Compared with CK,all the N topdressing treatments increased the biomass and P accumulation of ME and NME plants.ME achieved maximum shoot biomass and P accumulation at the 8th week topdressing treatment,reaching 52.11 g/plant and 219.71 mg/plant,respectively,which were 1.78 and 1.80 times those of CK and significantly higher than those of NME.Rhizosphere soil available P concentration in ME increased significantly at the 6th and 8th weeks topdressing treatment,exceeding both the control and the non-rhizosphere soil value,facilitating P uptake.The 8th week topdressing treatment in ME yielded the lowest plant effective number(significantly lower than that of NME)but the highest aboveground P extraction rate(significantly higher than that of NME),along with peak values of both maximum potential yield and maximum potential P removal.[Conclusions]N topdressing enhanced P accumulation and P removal efficiency in Polygonum hydropiper by promoting rhizosphere P activation and absorption.The 8th week post-transplantation topdressing stage optimized ME's P accumulation and soil P removal efficiency,with maximum shoot P accumulation(219.71 mg/plant)and maximum potential P removal(97.45 kg/hm²),and the P extraction capacity of ME was higher than that of NME.关键词
水蓼/追氮时期/土壤有效磷含量/地上部磷积累量/有效株数/磷提取率/最大潜在收获量/最大磷去除潜力Key words
Polygonum hydropiper/topdressing time/soil available P concentration/shoot P accumulation/plant effective number/P extraction ratio/maximum potential yield/maximum potential P removal引用本文复制引用
李艳春,李玉洁,蒲勇,李廷轩,叶代桦..高磷条件下追氮时期对水蓼磷积累能力和土壤磷去除潜力的影响[J].植物营养与肥料学报,2025,31(4):709-717,9.基金项目
国家自然科学基金面上项目(31972499) （31972499）
国家自然科学基金青年科学基金项目(32000064) （32000064）
四川农业大学学科建设双支计划特色创新团队项目(T202103). （T202103）
