What are the consequences of increased nitrogen deposition over terrestrial or aquatic ecosystems?

Nitrogen is one of the major abundant gas in the atmosphere occupying 78% by volume.

It plays an important role in controlling the aquatic and terrestrial ecosystem. The presence of high amount of nitrogen in the atmosphere can lead to the release of large amount of pollutants that includes ammonia and ozone, which can cause difficulty in breathing, visibility problems and at the same time, it will also the affect the growth and expansion of plants. It also can damages to the forests, soils, and water.

The presence of extremely large amount of nitrogen gas in the aquatic ecosystem can also influence the growth of aquatic plants and algae. When these organisms are present in a large number then it blocks the water in-taking path of these plants. It eventually consumes the dissolved oxygen as soon as they decompose, as a result of which it does not allow the light to penetrate into the deeper water (zones).

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.