紫穗槐植株的养分含量及分布特征

为了探明紫穗槐植株的营养结构特征,测定了生长季(6,7,8,9月)紫穗槐叶和不同径级根、茎的10种养分(有机碳、N、P、K、Ca、Mg、Fe、Mn、Cu、Zn)含量。结果表明,1)根和茎的N、P、K含量与径级呈典型逆相关关系,即随着径级的增大养分含量减少,含量最高的部位集中于叶及小径级的根、茎。2) 各级根、茎的Ca、Mg、Fe、Mn、Cu、Zn含量没有固定的分布特征。3)微量元素间的相关性比其与大量元素的相关性差,茎中所含相关元素对最多,其次是叶,根最少;从元素方面看,N、P、K与较多的元素间存在相关性,与C、Zn、Ca相关的元素较少。4)生长季紫穗槐叶的C、N、Ca、Mn、Cu含量高于根和茎,叶中大量元素的含量顺序为C＞N＞K＞Ca＞Mg＞P,微量元素为Fe＞Mn＞Zn＞Cu。

Nutrient structure of Amorpha fruticosa

The nutrient structure of Amorpha fruticosa was studied during the growing season by analysing the nutrient contents of leaves, stems and roots of different diameter for C, N, P, K, Ca, Mg, Fe, Mn, Cu, and Zn. 1) The nutrient contents of N, P and K were the inverse of stem and root diameter (they reduced as the diameter increased). The highest contents were in the leaf, stem and thin roots. 2) There was no specific pattern of Ca, Mg, Fe, Mn, Cu, and Zn contents with stem and root diameters. 3) The correlation between trace elements was poorer than that between trace elements and macro-elements. Most correlation element pairs were in the stem, followed by the leaves, then roots. N, P, and K had the most relationships with other elements but C, Zn and Ca had fewer. 4) There was more organic carbon, N, Ca, Mn and Cu in the leaves than in the stems and roots of A. fruticosa during the whole growingh season. The order of macro-element content in leaves was C＞N＞K＞Ca＞Mg＞P, and the order of trace element contents was Fe＞Mn＞Zn＞Cu.