1. A wetland is an area of land whose soil is saturated with moisture either permanently or seasonally.
2. A mild drought is brought about by less than average precipitation, dry air near the ground and slight insufficiency of soil moisture.
3. It occurs with deficiencies of precipitation, lack of soil moisture or low water levels in sources such as rivers and lakes.
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4. Yunnan has seen little rain for almost three years, resulting in low soil moisture levels.
5. This has led to a sharp decrease in the soil's moisture content.
6. Researchers said more ponds and reservoirs need to be built to restore soil moisture, and forest belts need to be in place to stabilize the soil.
7. The soil helps to preserve moisture, so it is not brushed off until the truffle is ready to be served.
8. Meteorological authorities called for measures to maintain soil moisture for the upcoming spring sowing.
9. The hotter weather will also reduce the moisture in the soil, cutting yields even further.