Question

what is the difference between overuse and misuse of resources? ​

Answer 1

Misuse of natural resources; refers to excessive use, destructive use or achieving imbalance between resources either individually or in combination.

Answer 2

Answer:

Used irrigation water is often contaminated with salts, pesticides and herbicides. Industry and urban centres also return contaminated water to both surface and underground water resources.

One of the most conspicuous results of overuse is that some large rivers - including the HuangHe, the Colorado and the Shebelli - now dry up before reaching the sea. The Amu Darya River which feeds the Aral Sea (see box left) has been deprived of its entire water reserves for irrigating cotton plantations. The Yellow River in China did not complete its descent to the sea for a total of seven months during.

Dried-up rivers are a good example of the overuse of freshwater resources. Overuse in one place means deprivation in another. The flat fertile deltas of many rivers were once centres of high agricultural production. Where the rivers no longer flow, water for irrigation becomes unavailable, farmers go out of business and local production fails.

The causes are usually upstream development. Logging, road building and upstream agriculture often increase soil erosion, resulting in increased sedimentation. This leads to flooding in mid-stream areas and reduced water flows downstream. Sedimentation is also clogging the world's major water reservoirs, currently estimated to hold about 6000 km3 of water. About one percent of this - the equivalent of 60 km3 - is now being lost annually through sedimentation.

Irrigated agriculture has a significant impact on the environment. One positive impact is that high-productivity irrigation of a small area can often replace the use of a much larger area of marginal land for growing crops. However, abstraction of irrigation water from rivers and lakes can also jeopardize aquatic ecosystems such as wetlands, leading to losses in their productivity and biodiversity. This has important implications for human populations that once depended on the major inland fisheries that such areas previously supported and on the natural filtering action of wetlands which have historically been responsible for cleaning up much of the world's wastewater. Where wetlands have been eliminated in the name of irrigation, the results have usually been regretted.

The agricultural chemicals used in irrigated farming often contaminate surface runoff and groundwater. Potassium and nitrogen from fertilizer applications on both rainfed and irrigated land may be washed into groundwater or surface water where they can lead to algal blooms and eu trophication.

Explanation:

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