試題詳解

87. Quantities of mineral nutrients in soils of tropical rain forests are relatively low because

(A) the decomposition of organic refuse and reassimilation of chemicals by plants occur rapidly.

(B) nutrient cycles occur at a relatively slow rate in tropical soils.

(C) the standing crop is small.

(D) microorganisms that recycle chemicals are not very abundant in tropical soils.

(E) the high temperatures destroy the nutrients.