摘要
【目的】探明CO_(2)浓度升高是否改变土壤养分状况进而影响萝卜生长及养分吸收,为大气CO_(2)浓度升高条件下萝卜合理施肥方式提供理论依据。【方法】以糖晶萝卜为试验材料,设置4个CO_(2)浓度水平:C_(0)(大气CO_(2)浓度)、C_(1)(C_(0)+33%C_(0))、C_(2)(C_(0)+67%C_(0))和C_(3)(C_(0)+100%C_(0)),研究不同CO_(2)浓度对萝卜生长、氮磷钾养分吸收及土壤养分的影响。【结果】与C_(0)相比,C_(1)、C_(2)和C_(3)处理萝卜地上生物量增加0.52%~34.68%,地下生物量增加63.00%~100.46%,总生物量增加37.83%~67.61%,CO_(2)浓度升高促进萝卜生长和干物质积累,且C_(2)处理最适宜;CO_(2)浓度升高降低萝卜地下氮磷和地上钾含量,但植株氮磷钾积累量分别增加39.77%~43.30%、2.08%~17.27%和38.38%~72.26%。土壤硝态氮、有效磷和速效钾在CO_(2)浓度升高条件下分别降低29.62%~34.20%、10.03%~14.12%和1.92%~16.62%。植株氮和钾积累量与植株干重呈显著正相关,与土壤硝态氮、有效磷和速效钾呈显著负相关。【结论】CO_(2)浓度升高通过增加脲酶和磷酸酶活性改善土壤肥力,促进植株氮磷钾养分吸收,进而提高萝卜产量。在大气CO_(2)浓度升高条件下,应合理增施氮肥、磷肥、钾肥,且氮肥施用量应大于磷肥和钾肥。
【Objective】It aimed to investigate whether elevated CO_(2) concentration affects radish growth and nutrient uptake by altering soil nutrients,and to provide theoretical references for rational fertilization of radish under elevated atmospheric CO_(2) concentration.【Method】Radish cultivar‘Tangjing’was used as the experimental material.Four CO_(2) concentration levels including C_(0)(atmospheric CO_(2) concentration),C_(1)(C_(0)+33%C_(0)),C_(2)(C_(0)+67%C_(0))and C_(3)(C_(0)+100%C_(0))were set to study the effects of different CO_(2) concentrations on radish growth and nitrogen,phosphorus and potassium nutrient uptake.【Result】Compared with C_(0),the aboveground biomass increased by 0.52%—34.68%,the underground biomass increased by 63.00%—100.46%,and the total biomass increased by 37.83%—67.61%under C_(1),C_(2) and C_(3) treatment,which promoted the growth and dry matter accumulation of radish,and C_(2) was the most suitable treatment.Although increasing CO_(2) concentration reduced the concentration of underground nitrogen and phosphorus and aboveground potassium in radish,the accumulation of nitrogen,phosphorus and potassium in plants increased by 39.77%—43.30%,2.08%—17.27%and 38.38%—72.26%,respectively.In addition,soil nitrate nitrogen,available phosphorus and available potassium were decreased by 29.62%—34.20%,10.03%—14.12%and 1.92%—16.62%respectively as the CO_(2) concentration elevated.The accumulation of nitrogen and potassium in plants were positively correlated with plant dry weight,and negatively correlated with soil nitrate nitrogen,available phosphorus and available potassium.【Conclusion】Elevated CO_(2) improved soil fertility by increasing urease and phosphatase activities,and promoted the absorption of nitrogen,phosphorus and potassium nutrients,thereby increasing yield.Under the condition of elevated CO_(2) concentration,it is reasonable that increaing the application of nitrogen fertilizer,phosphorus fertilizer,potassium fertilizer,and the amount of nitrogen fert
作者
朱雪
施松梅
王薪锯
弓月芳
何新华
蒲全明
杨正安
ZHU Xue;SHI Songmei;WANG Xinju;GONG Yuefang;HE Xinhua;PU Quanming;YANG Zheng’an(Key Laboratory of Vegetable Biology of Yunnan Province/College of Landscape and Horticulture,Yunnan Agricultural University,Kunming,Yunnan 650201;College of Resource and Environment,Southwest University,Chongqing 400716;Nanchong Academy of Agricultural Sciences,Nanchong,Sichuan 637000,China)
出处
《贵州农业科学》
CAS
2024年第4期1-11,共11页
Guizhou Agricultural Sciences
基金
国家自然科学基金项目(42267056)
云南省基础研究项目(202301AU070115)。
