渤海生态锥体的结构和变化
Change the structure and variations of the ecological pyramid in the Bohai Sea
结果表明:(1)两类棉田系统的食物网结构、营养层、生态锥体、生态效率等基本特征相似,在能量分配方面有量的差异;
The food web , trophic levels , ecological pyramid and ecological efficiencies are similar in the two ecological systems .