Precipitation regulates climate

Marsh wetland has the function of moistening climate and purifying environment, and is an important part of ecosystem. Most of them are negative landform types, with long-term water accumulation and dense plant growth, and there are intertwined residues under them. Submerged swamps generally have tens of centimeters of grass roots. The base is loose and porous, and has strong water-holding capacity, which can keep more than 3 ~ 15 times of its absolute dry weight. It can not only send water back to the atmosphere through plant transpiration and water evaporation, but also increase air humidity, adjust precipitation and play a good role in the natural circulation of water. According to experimental research, one hectare of swamp can evaporate 74 15 tons of water in the growing season, which shows its great role in regulating climate.

Wetlands play an important role in storing water, regulating river runoff, replenishing groundwater and maintaining regional water balance. It is a natural "sponge" for water storage and flood control. It can distribute uneven precipitation in time and space, and avoid floods and droughts by adjusting the throughput of wetlands.