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A large percentage (about 90 percent) of the nutrient and organic matter capital is in the soil of a ________?

A large percentage (about 90 percent) of the nutrient and organic matter capital is in the soil of a ________ ecosystem.

I’m not sure, but I think it looks very very likely that it’s either a., b., or e. I’m feel positive the answer is NOT c. tropical forest, because I’ve heard the story there often enough: the overall growth there is huge and lush, even though tropical soils tend to be not very fertile; therefore tropical tree and plant growth holds an exaggerated share of the organic matter and nutrients.

Going farther, I fairly doubt it’s either chaparral or desert, because I believe relatively little volume of plants grow there, so there’s not going to be too too much organic matter (organic matter I believe is considered to be dead and decomposed or partially decomposed life, mostly plant matter I think). Most “deserts” I think (and the ones I think they question may mean, here) , are have ‘hot” tendencies (not all “deserts”–because technically as I understand it, barren arctic places are also considered deserts), and organic matter tends to get destroyed and depleted in high heat, such as lying dead on the top of the ground in a hot desert. Therefore I think most of the organic matter and its part of the nutrients, in a hot desert, is in the living plants, not the soil. So the answer is probably not deserts.
Chaparral,is what, land with somewhat open but not lush or too heavy growth of scattered trees or small trees, and other stuff? And I think the reason chaparral may be (if I understand right what it is) light or sparse in plant growth, is unfavorable conditions such as dry tendencies. So therefore, fairly much like a desert, and so , partially the things going on may be similar to a desert, I think. If there were high organic matter in chaparral’s soil, the high organic matter would hold more of the limited rainwater or snowmelt that shows up, and the growth would be heavy, not light like in chaparral. So there must not be high organic matter in chaparral, so the answer cannot be chaparral.

Deciduous forests can grow on poor soil, and even grow thickly and big if there is enough water. Poor soils may or may not have low organic matter; probably for the purpose of this question, they are “not” thinking of one exception I can think of: a deciduous forest in a swamp (mine has a soil that’s about 90 per cent organic matter–I had it tested). So if this general kind of forest USUALLY is on soil of low organic matter (I suppose this is generally true, though probably with a big big exception of the millions and millions of acres of peat or muck type forests of this type), and often its soil is also shallow and infertile, then probably the wording of the question wants deciduous forests to be ruled out.
Therefore, “DaDa” the answer “must” be Temperate Grassland! Some of the soils of grasslands in the United States plains area, are still some ten feet deep (originally many, before erosion, were twenty or thirty feet deep) and without doubt all that soil can hold a lot of fertility and organic matter. We have a winner.
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