root-mean-square quantity

Root exudates markedly altered in species and quantity under heavy metal stress.

在重金属胁迫下,植物根系分泌物种类和量会发生显著变化.

When the root system reaches in certain content range, there is obvious increase with the increase of root content Rw to cohesion C, angle of internal friction is up to the growth but root quantity not very obvious.

当根系达到一定含量范围内时，粘聚力C随含根量Rw的增加有明显的增大，内摩擦角Ψ随含根量的增长并不太明显。

The morphological indexes include plant height, leaf area, the length of the main root, the quantity of the first branched root, the length of the longest branched root, the root volume and the dry weight of root and plant, et al.

测定的形态指标包括株高、叶面积、主根长度、侧根数、最长侧根长度、根系体积、根干重和地上部分干重等；

The three forms of the Compartment Model can describe the change of soil moisture in different season. ( 3) The thesis evaluates the suitability of fruit tree under the soil moisture content quantity according to the root distribution and soil moisture content of different layer.

苹果园深层土壤水分变化可用隔室模型进行描述。（3）综合考虑果树根系分布和不同土层土壤水分含量，定量评价了土壤水分含量对苹果树生长的适宜性。

There is a great quantity of aerenchyma and secretory canals distributed in root, stem and leaf.

根 、 茎、叶中均有发达的通气组织和分泌道分布.