川东红池坝地区红三叶和鸭茅人工草地土壤和植物营养元素含量特征的研究

川东红池坝地区红三叶（Ｔｒｉｆｏｌｉｕｍｐｒａｔｅｎｓｅ）和鸭茅（Ｄａｃｔｙｌｉｓｇｌｏｍｅｒａｔａ）人工草地土壤和植物营养元素的含量特征如下：（１）土壤中的元素含量以铁、钾和镁较高，钠、钙、氮、锰和磷较低，硫、锌、硼、铜和钼微少；（２）从元素的富集特征来看，该区土壤中的钙、硫为重度淋溶元素，钾、磷、镁、锌、钠为中度淋溶元素，铁、铜属轻度淋溶元素，锰属富集元素；（３）根据元素的生物吸收系列，红三叶属氮－钙型植物，鸭茅属氮－钾－磷型植物。（４）两种牧草的生物吸收系数，均以钙、硫、磷较高，钠、铁较低，其余７种元素介于二者之间。

NUTRIENT ELEMENT CONTENTS IN SOIL AND PLANTS IN THE TRIFOLIUM PRATENSE AND DACTYLIS GLOMERATA ARTIFICIAL GRASSLAND IN THE HONGCHIBA AREA,EASTERN PART OF SICHUAN PROVINCE

In this paper,nutrient element contents in soil and plants in thd Trifolium pratense and Dactylis glomerata artificial grassland in the Hongchiba area,eastern part of Sichuan province were analysed.The major results are as follows: 1)The contents of Fe,K and Mg were high,the contents of Na,Ca,N,Mn and P were low,the contents of S,Zn,B,Cu and Mo were very small. 2) According to enrichment parameter of elements,Ca and S were heavy leached elements,K,P,Mg,Zn and Na were moderately leached elements,Fe and Cu were lightly leached elements and Mn is an enriched element in the soil. 3) According to biological absorption series of elements, T.pratense was N Ca type plant, D.glomerata was N K P type. 4) Biological absorption coefficients of Ca,S and P were high,those of Na and Fe were low,those of the other 7 elements were in between.