drought
Drought refers to a region of long-term no rain or high temperature and less rain, so that the lack of air and soil moisture. While drought is mainly related to sporadic or cyclical precipitation reduction. From the human factors to consider, man-made activities lead to drought mainly for the following four reasons: First, the population increased, resulting in a limited shortage of water resources. Second, the forest plants were human destruction, the loss of plant water storage, they extracted groundwater, resulting in reduced groundwater and soil water. Third, human activities cause a lot of water pollution, so that available water resources. Four is a waste of water. Drought is one of the most serious climate disasters affecting human society. It has the characteristics of high frequency, long duration and wide spread. The frequent occurrence and long-term droughts of drought will not only bring huge losses to the social economy, especially agricultural production, but also cause the ecological and environmental adverse effects such as water shortage, desertification and dust storms. ...