6种水土保持植物枝条的数量特征

Branch quantity characteristic of six kinds of soil and water conservation plants

植物枝条生物力学特性是研究植物地上部分防风抗蚀作用的基础。以内蒙古准格尔露天煤矿排土场平台和边坡上栽植的柠条、沙棘、紫花苜蓿、沙打旺、杨柴、草木犀6种常见水土保持植物的地上部分枝条为研究对象,研究枝条数量特征,确定其代表枝,从而为几种植物枝条生物力学性质的研究提供基础数据和相关参数。代表枝的确定将枝条以0.5 mm为一个径级进行分级,分别计算每个径级组的累计枝数量比例、累计枝长比例、累计枝表面积比例和累计枝干质量比例,取这4个值相对较大的径级组作为各自的代表枝。结果表明:柠条代表枝径级为0.5～1和1～1.5 mm,沙棘为1～1.5和1.5～2 mm,杨柴为0～0.5和0.5～1 mm,紫花苜蓿为0.5～1 mm,沙打旺为0.5～1和1～1.5 mm,草木犀为1～1.5 mm。因此,在内蒙古准格尔采煤矿区及相似地区,在植物防风抗蚀生物力学性质的研究中,建议以上述6种水土保持植物作代表枝径级为主要研究范围。

The biomechanical properties of branches is the basis for the study on effect of aerial part of plants on the windbreak and soil erosion reduction.In this paper the branches of six kinds of soil and water conservation plants（Caragana microphylia,Hippophae rhamnoides,Medicago sativa,Astragalus adsurgens,Hedysarum fruticosum,and Melilotus officinalis） in Waste Dump of Strip Mine in Heidaigou were taken as research object.Through studying the the characteristic of branch quantity,representative branches of plants were determined,thus the bais data and relevant parameter were supplied to the study of biomechanical properties of branches.The process of selecting representative branches is that：firstly,the diameters of branches were divided into several classes with distance of 0.5 millimeter.Then,the percentage of cumulative amount,cumulative length,surface area and dry weight of branches of each diameter class was calculated respectively,and diameter classes with high percentage of these values were selected as representative diameter classes.The results showed representative diameter classes of several plants,respectively,i.e.Caragana microphylia 0.5-1 mm,1-1.5 mm,Hippophae rhamnoides 1-1.5 mm,1.5-2 mm,Hedysarum fruticosum 0-0.5 mm,0.5-1 mm,Medicago sativa 0.5-1 mm Astragalus adsurgens 0.5-1 mm,1-1.5 mm,Melilotus officinalis 1-1.5 mm.In the study of the biomechanical properties of branches,it is recommended that in Inner Mongolia Zhungeer coal mining area and similar areas,representative diameter classes of the six kinds of soil and water conservation plant is the main study focus.