这种植物能长到15米高，改变了水文和营养物质的平衡而从根本上改变了森林组成结构。
It can grow up to 15 meters tall and is "fundamentally changing" the forest architecture, he says, altering the hydrology and nutrient balance.
山核桃树皮的皮层均由9 - 12层富含营养物质的薄壁细胞组成，其机械性能在一定程度上影响着树皮对溃疡病抗性。
The cortex of bark was consist of 9-12 layer nutrient element parenchyma so its mechanical capability have influence on the resistance to the disease.
外生菌根真菌与很多植物形成互利共生关系，在营养物质交换和碳循环等方面起着关键性的作用，是森林生态系统的重要组成部分。
Ectomycorrhizal ( EcM) fungi form mutualistic symbioses with many tree species and are regarded as key organisms involved in nutrient and carbon cycling in forest ecosystems .
谷类作物的须根系主要由不定根组成，在营养物质和水分吸收中发挥重要作用。
The fibrous root system in cereals comprises primarily adventitious roots (ARs), which play important roles in nutrient and water uptake.
海湾沉积物中的有机质和氮、磷营养物质丰富与否，直接反映了底质环境的优劣。底质环境的好坏在一定程度上又直接影响生物的生存、发育及种类组成。
The abundance of organism, nitrogen and phosphorus in the sediment directly reflect the bottom environment which, influences to a certain extent the organisms, their variety and composition.
它和铁元素一起参与红细胞的产生，实际上，它是一种让铁溶进血红蛋白的营养物质，是具有携氧能力的红细胞的组成部分。
Thiss goes along with iron when it comes to regulating red blood cell production, and it's actually the nutrient that allows iron to be incorporated into hemoglobin;
它和铁元素一起参与红细胞的产生，实际上，它是一种让铁溶进血红蛋白的营养物质，是具有携氧能力的红细胞的组成部分。
Thiss goes along with iron when it comes to regulating red blood cell production, and it's actually the nutrient that allows iron to be incorporated into hemoglobin;
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