摘要
以攀西地区抛荒地、玉米连作、西葫芦-玉米轮作、豌豆-玉米轮作下红壤耕层(0~20 cm)和亚耕层(20~40 cm)土壤为研究对象,探讨玉米种植制度对红壤磷素形态及其有效性的影响。结果表明:耕层土壤全磷、有效磷含量和磷素活化系数均高于亚耕层,以豌豆-玉米轮作土壤最高。4种种植制度下红壤磷素均以有机磷为主,在耕层中占全磷的57.8%~81.1%,在亚耕层中占74.3%~85.5%。除豌豆-玉米轮作外,其余3种种植制度下土壤磷组分均以氢氧化钠提取态磷(NaOH-P)为主;而有效性较高的水溶性磷(H2O-P)和碳酸氢钠提取态磷(NaHCO3-P)含量较低,在耕层中仅占全磷的0.3%~2.1%、在亚耕层中仅占1.7%~10.0%;两层土壤的盐酸提取态磷(HCl-P)含量均以豌豆-玉米轮作最高,与其他3种种植制度差异显著。相关分析表明,两层土壤的有效磷、碳酸氢钠提取态有机磷(NaHCO3-Po)、氢氧化钠提取态有机磷(NaOH-Po)、盐酸提取态无机磷(HCl-Pi)含量与土壤pH、阳离子交换量、铁氧化物、铝氧化物和土壤质地呈显著相关关系。说明攀西地区豌豆-玉米轮作是提高红壤磷素有效性的最优种植制度。
To clarify the effects of corn-based cropping systems on phosphorus(P)fractions and availability in red soil,we measured P fractions and availability of topsoil(0-20 cm)and subsoil(20-40 cm)in abandoned farmland(control)and three corn-based cropping systems(corn continuous cropping,zucchini-corn rotation and pea-corn rotation),respectively.The results showed that total P,available P contents and P activation coefficient in topsoil were higher than those in subsoil.The value of relative P parameters in topsoil of pea-corn rotation was the highest among all cropping systems.Organic P was the main P fraction in red soil,accounting for 57.8%-81.1%(topsoil)and 74.3%-85.5%(subsoil)of total P.Except for pea-corn rotation soil,sodium hydroxide extractable P(NaOH-P)was the main P fraction in other cropping systems.The contents of water-soluble P(H2O-P)and sodium bicarbonate extractable P(NaHCO3-P)with high availability were lower than other P fractions,only accounting for 0.3%-2.1%(topsoil)and 1.7%-10.0%(subsoil)of total P.The pea-corn rotation soil had the highest hydrochloric acid extractable P(HCl-P)content in topsoil and subsoil,and significantly differed from other cropping systems.The contents of available P,sodium bicarbonate extractable organic P(NaHCO3-Po),sodium hydroxide extractable organic P(NaOH-Po)and hydrochloric acid extractable inorganic P(HCl-Pi)were significantly correlated with pH,cation exchange capacity,iron-aluminum oxides and soil texture.In conclusion,pea-corn rotation was the most suitable system to improve P availability of red soil in Panxi area.
作者
苟小梅
王昌全
李冰
蔡艳
叶想
杨釜
周琨翔
周雪宇
GOU Xiao-mei;WANG Chang-quan;LI Bing;CAI Yan;YE Xiang;YANG Fu;ZHOU Kunxiang;ZHOU Xue-yu(College of Resources,Sichuan Agricultural University,Chengdu 611130,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2020年第3期883-889,共7页
Chinese Journal of Applied Ecology
基金
国家重点研究开发计划项目(2018YFD0200700)资助。
关键词
种植制度
磷有效性
磷组分
红壤
cropping system
phosphorus availability
phosphorus fractionation
red soil
