甘肃陇东地区紫花苜蓿草地土-草矿质养分含量及其相关性  

The mineral nutrient content of soil and grass and their relevance in alfalfa pasture in eastern Gansu Province

作　　者：李满红 师尚礼[1] 张英俊[2] 鱼小军[1] LI Man-hong;SHI Shang-li;ZHANG Ying-jun;YU Xiao-jun(College of Pratacultural Science,Gansu Agricultural University/Key Laboratory of Grassland Ecosystem of Ministry of Education/Sino-U.S.Centers for Grazingland Ecosystem Sustainabilit;College of Animal Science and Technology,China Agricultural University,Beijing 100083,China)

机构地区：[1]甘肃农业大学草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心,甘肃兰州730070 [2]中国农业大学,北京100083

出　　处：《草原与草坪》2018年第3期79-84,共6页Grassland and Turf

基　　金：国家牧草产业技术体系(CARS-3S)资助

摘　　要：为明确甘肃陇东地区苜蓿草地土壤矿质养分亏缺及牧草养分水平,对环县、合水、庄浪、泾川的苜蓿和土壤的N、P、K、Fe、Mn、Cu、Zn含量及其相关性进行研究。结果表明:试验区土壤N含量略高于我国平均水平、P含量低于我国平均水平,K素略低于我国平均水平;土壤矿质元素含量为有效Mn极富、有效Zn中等、有效Fe、Cu缺乏。苜蓿中N含量适中,P、Fe、Mn、Cu、Zn含量较低,K素含量高;苜蓿对K素需求量高于所测其他矿质养分;苜蓿微量元含量由高到低为Fe>Mn>Zn>Cu,且苜蓿对Fe的需求高于Mn,Zn和Cu。土壤与苜蓿的全P含量极显著相关(r=-0.738,P<0.01),全N含量显著相关(r=-0.522,P<0.05),有效Fe含量显著相关(r=0.61,P<0.05),有效Zn含量呈高度相关(r=0.742,P<0.05);土壤与苜蓿全K、有效Cu、有效Mn含量未呈现出显著关系。In order to clarify the soil mineral nutrient deficiency and nutrient level of alfalfa pasture in Longdong area of Gansu Province,the study on the content and the correlation of N,P,K,Fe,Mn,Cu and Zn in alfalfa and soil was conducted in Huanxian,Heishui,Zhuanglang and Jingchuan.The results showed that soil N content was slightly higher while P and K contents were lower than the standard average levels in China.Soil available Mn content was high,soil available Zn content was medium while the contents of soil available Fe and Cu were deficient.The contents of N,P,Fe,Mn,Cu and Zn in alfalfa were low,but K was high;Alfalfa demands for K was higher than other elements;The order of trace element contents from high to low was Fe,Mn,Zn and Cu,and alfalfa demand for Fe was higher than Mn,Zn and Cu.The P contents of soil and alfalfa were highly correlated（r=-0.738,P〈0.01）.The N contents of soil and alfalfa were moderately correlated（r=-0.522,P〈0.05）.The contents of available Fe in soil and alfalfa were moderately correlated（r=0.61,P〈0.05）.The contents of available Zn in soil and alfalfa were highly correlated（r=0.742,P〈0.05）.The contents of total K and available Cu and Mn in soil and alfalfa did not correlate significantly.

关 键 词：陇东地区 苜蓿草地 大量元素 微量元素 相关性 

分 类 号：S541[农业科学—作物学]