The effects of biochar(BC),arbuscular mycorrhizal fungi(AM),nitrogen(N)and their composite treatments(BC+N,AM+N,BC+AM and BC+AM+N)application on Cichorium intybus L.(C.intybus L.)nutrient uptake,soil properties and ca...The effects of biochar(BC),arbuscular mycorrhizal fungi(AM),nitrogen(N)and their composite treatments(BC+N,AM+N,BC+AM and BC+AM+N)application on Cichorium intybus L.(C.intybus L.)nutrient uptake,soil properties and cadmium(Cd)accumulation were investigated in Cd contaminated soil(0.11 mg·kg^(-1)).The results showed that the addition of BC increased the rate of mycorrhizal infection.However,the addition of N slightly inhibited mycorrhizal colonization,and the shoot and root bioaccumulation of chicory was positively influenced by BC and N when inoculated with AM fungi.Compared with the single component treatment(AM,BC or N)or two-component treatment(BC+N,AM+N or BC+AM),the three-component composite treatment(BC+AM+N)had the highest shoot bioaccumulation,whereas BC+AM treatment was considered the best for root biomass bioaccumulation.Compared with the control treatment,the single component treatment(AM,BC or N)and the composite treatment resulted in an overall improvement of the chicory shoot,root related nutrient uptake(N,P,K,Mg,Ca,Mn and Fe)and some soil physicochemical properties;in addition,these treatments showed better results than BC+AM+N and BC+AM treatments.Among the Cd-related indexes,Cd concentrations in the shoot,root and soil of C.intybus L.were reduced through treatment with AM and BC.However,a lower bioconcentration coefficient(BCF)and a higher transfer coefficient(TF)were observed in both treatments,and the most desirable effect was observed following the combination treatment(BC+AM).Compared with other single management,the shoot and root Cd concentrations of C.intybus L.after the management of N alone were higher,and the value of BCF(2.63%)was higher,but the value of TF(1.05%)was lower.Indexes related to Cd improved concurrently following the application of N in combination with BC or AM.Therefore,in Cd contaminated soils,single or combined application of BC,AM and N could promote chicory growth and nutrient uptake and improve some soil physicochemical properties.However,N should not be applied alone and needed to be combined with AM and BC;furthermore,it was evident that the treatment with the three composites(BC+AM+N)was optimal from an application point of view.展开更多
为研究不同施氮量对黑小麦产量、干物质积累及氮素吸收利用的影响,试验以黑小麦品种‘农大876’和‘冀紫439’为供试材料,于2021—2023年在田间设置不施氮和分别施氮120、180、240 kg N/hm^(2)处理,于各生长期测定产量要素及各器官含氮...为研究不同施氮量对黑小麦产量、干物质积累及氮素吸收利用的影响,试验以黑小麦品种‘农大876’和‘冀紫439’为供试材料,于2021—2023年在田间设置不施氮和分别施氮120、180、240 kg N/hm^(2)处理,于各生长期测定产量要素及各器官含氮量。结果表明:增加施氮量提高黑小麦产量主要是由于提高了穗数和收获指数,但品种间存在差异。对于‘农大876’,施氮180 kg N/hm^(2)产量最高,与不施氮处理相比显著提高13.0%;‘冀紫439’施氮180 kg N/hm^(2)和240 kg N/hm^(2)产量与不施氮处理相比均提高48.8%。提高施氮量,有利于提高黑小麦地上部吸氮量和干物质积累量,但品种间存在显著差异。‘农大876’、‘冀紫439’于拔节期追肥后,地上部干物质积累量分别增加72.9%~128.4%、131.5%~215.2%,表明‘冀紫439’对氮肥的响应更为敏感。增施氮肥对氮素收获指数无显著影响,但均不利于提高两个黑小麦品种的氮素吸收效率、氮素利用效率、氮肥偏生产力。因此,在与本研究土壤环境一致的条件下,对于‘农大876’这类相对高杆且低养分需求的黑小麦品种,其最高产量推荐施氮量为199 kg N/hm^(2);而对于‘冀紫439’这类对氮肥响应更敏感的黑小麦品种,其最高产量推荐施氮量为211 kg N/hm^(2)。展开更多
文摘The effects of biochar(BC),arbuscular mycorrhizal fungi(AM),nitrogen(N)and their composite treatments(BC+N,AM+N,BC+AM and BC+AM+N)application on Cichorium intybus L.(C.intybus L.)nutrient uptake,soil properties and cadmium(Cd)accumulation were investigated in Cd contaminated soil(0.11 mg·kg^(-1)).The results showed that the addition of BC increased the rate of mycorrhizal infection.However,the addition of N slightly inhibited mycorrhizal colonization,and the shoot and root bioaccumulation of chicory was positively influenced by BC and N when inoculated with AM fungi.Compared with the single component treatment(AM,BC or N)or two-component treatment(BC+N,AM+N or BC+AM),the three-component composite treatment(BC+AM+N)had the highest shoot bioaccumulation,whereas BC+AM treatment was considered the best for root biomass bioaccumulation.Compared with the control treatment,the single component treatment(AM,BC or N)and the composite treatment resulted in an overall improvement of the chicory shoot,root related nutrient uptake(N,P,K,Mg,Ca,Mn and Fe)and some soil physicochemical properties;in addition,these treatments showed better results than BC+AM+N and BC+AM treatments.Among the Cd-related indexes,Cd concentrations in the shoot,root and soil of C.intybus L.were reduced through treatment with AM and BC.However,a lower bioconcentration coefficient(BCF)and a higher transfer coefficient(TF)were observed in both treatments,and the most desirable effect was observed following the combination treatment(BC+AM).Compared with other single management,the shoot and root Cd concentrations of C.intybus L.after the management of N alone were higher,and the value of BCF(2.63%)was higher,but the value of TF(1.05%)was lower.Indexes related to Cd improved concurrently following the application of N in combination with BC or AM.Therefore,in Cd contaminated soils,single or combined application of BC,AM and N could promote chicory growth and nutrient uptake and improve some soil physicochemical properties.However,N should not be applied alone and needed to be combined with AM and BC;furthermore,it was evident that the treatment with the three composites(BC+AM+N)was optimal from an application point of view.
文摘为研究不同施氮量对黑小麦产量、干物质积累及氮素吸收利用的影响,试验以黑小麦品种‘农大876’和‘冀紫439’为供试材料,于2021—2023年在田间设置不施氮和分别施氮120、180、240 kg N/hm^(2)处理,于各生长期测定产量要素及各器官含氮量。结果表明:增加施氮量提高黑小麦产量主要是由于提高了穗数和收获指数,但品种间存在差异。对于‘农大876’,施氮180 kg N/hm^(2)产量最高,与不施氮处理相比显著提高13.0%;‘冀紫439’施氮180 kg N/hm^(2)和240 kg N/hm^(2)产量与不施氮处理相比均提高48.8%。提高施氮量,有利于提高黑小麦地上部吸氮量和干物质积累量,但品种间存在显著差异。‘农大876’、‘冀紫439’于拔节期追肥后,地上部干物质积累量分别增加72.9%~128.4%、131.5%~215.2%,表明‘冀紫439’对氮肥的响应更为敏感。增施氮肥对氮素收获指数无显著影响,但均不利于提高两个黑小麦品种的氮素吸收效率、氮素利用效率、氮肥偏生产力。因此,在与本研究土壤环境一致的条件下,对于‘农大876’这类相对高杆且低养分需求的黑小麦品种,其最高产量推荐施氮量为199 kg N/hm^(2);而对于‘冀紫439’这类对氮肥响应更敏感的黑小麦品种,其最高产量推荐施氮量为211 kg N/hm^(2)。
