D. Observed patterns in plant species diversity were likely due to what biologic

Question

D. Observed patterns in plant species diversity were likely due to what biological processes? Explain.

**if you are unsure about any answers, that is okay, but please indicate which you are not 100% sure of so I know which to double check

Question 2. To test how predicted increases in nitrogen deposition might affect a temperate grassland ecosystem, researchers set up the following experiment: over a 1-year period, experimental plots were fertilized with excess nitrogen while control plots remained unmanipulated. At the end of the experiment, they measured aboveground biomass (an index of NPP, P = 0.033) and plant species diversity (P = 0.005): O2.0 700 600 a 500 400 300 200 OL 1.6 1.2 CO 1.0 Control Experimental Control Experimental plots plots plots plots

Explanation / Answer

As net primary production (NPP) in many terrestrial ecosystems is N-limited and tropical rain forests – generating one-third of global terrestrial NPP – exert a considerable influence on the world’s carbon (C) budget, human alterations of the N constraints on possibly N-limited NPP of some tropical ecosystems might have a drastic efect om global carbon cycle.

Here  Fine root biomass allocated to the 10-20 cm mineral soil in the N-fertilized plots increased two-fold compared to the control, probably because the changed vertical distribution of mineral N allows fine roots to forage for other limiting nutrients, e.g. phosphorus, in the mineral soil without being constrained by the low N availability of the unamended mineral soil.

b.Continuous increase in nitrogen probably caused the growth of invasive species .Fast growing non-native plants respond positively to increased nitrogen . Slow growing native species are adapted to low levels of nitrogen and are therefore less able to effectively utilize additional nitrogen . This leads to serious global consequences because ecosystem processes such as water use, plant productivity, and pest and disease cycles may become more variable as plant diversity declines.

Also eutrophication may be another reason .

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