Are paddy fields perennial waters? Urgent! How paddy fields are graded

Not really! The paddy field only has water when the rice is planted, and the water is replenished every few days, and the water is no longer replenished when the rice is almost ripe, and when the rice is dry, it is almost time to harvest. However, the rice growing areas in China are not the same, and there are slight differences.

But no matter in the ** paddy field, there will be no perennial waters.

Yes, because there is a difference between paddy fields and feeling fields. In the south, paddy fields are mainly cultivated as rice-based food crops.

No, the cultivated land is divided into paddy fields and dry land, with paddy fields in the south and dry land in the north.

"Wetland" generally refers to lowland with a water depth of no more than 2 meters for temporary or long-term covering, meadows with more water-filled wetland soil, and coastal areas with a water depth of less than 6 meters at low tide, including various brackish and freshwater marshes, wet meadows, lakes, rivers, floodplains, and estuarine deltas.

peatlands, lakes and beaches, riverside depressions or floodplains, wet grasslands, etc. Article 3 of the 12-year Suzhou Wetland Protection Regulations defines "wetland" as: "humid areas and waters with perennial or seasonal water accumulation, suitable for the survival of wild animals and plants, and with the function of ecological monitoring and control, including natural wetlands such as lake sections, rivers, swamps, tidal flats, etc., as well as those passing through cities and county-level cities."

Constructed wetlands with special protection value, such as permanent rice fields determined by the people. Wish.

It is divided according to the fertility of the soil.

The eight categories of land are: cultivated land, orchard land, forest land, pasture land, residential and industrial and mining land, transportation land, water area, and unused land.

1) Cultivated land refers to the land where crops are planted, including newly opened wasteland, fallow land, rotational land, and grassland rotation land; land with scattered fruit trees, mulberry trees or other trees between crops; Shoals and tidal flats cultivated for more than three years include ditches, canals, roads and ridges that are less than a meter wide in the south and less than a meter in the north.

In the cultivated land, there are five secondary land types: irrigated paddy field, Wangtian field, irrigated land, dry land and vegetable land.

2) Garden land refers to the planting of perennial woody and herbaceous crops mainly collected fruits, leaves, rhizomes, etc., with a coverage of more than 50, or the number of trees per mu is greater than 70 reasonable trees, including fruit nurseries and other land.

3) Forest land refers to the land where trees, bamboos, shrubs, and coastal mangroves grow, excluding residential green land, as well as road protection and grass protection forests for railways, highways, rivers and ditches.

The forest land is divided into six secondary land types: forest land, shrub forest, sparse forest land, undeveloped forest land, trace land and nursery.

4) Pasture land refers to the land where plants and plants are mainly grown, and is used for animal husbandry. The coverage of herbaceous vegetation is generally more than 15, the arid area is more than 5, and the canopy density of trees is less than 10.

Pasture grassland is divided into three secondary land categories: natural grassland, improved grassland and artificial grassland.

5) Residential areas and industrial and mining land refer to the land used by enterprises and institutions such as industrial and mining, national defense, and places of interest and historic sites outside residential areas, including urban and rural settlements, independent residential areas, and residential areas.

Residential areas and industrial and mining land are divided into five secondary land categories: urban residential areas, rural residential areas, independent industrial and mining land, salt pans and special land.

6) Traffic land refers to all kinds of roads (including road protection forests) and their ancillary facilities and civil airport land outside residential areas.

The transportation land is divided into five secondary land categories: railways, highways, rural roads, civil airports, and ports and terminals.

7) Water area refers to land waters and land for water conservancy facilities, excluding flood discharge areas, tidal flats and tidal flats that have been cultivated for more than 3 years, forest land, residential areas, roads, etc.

The water area is divided into 9 secondary land categories: river water surface, lake water surface, reservoir water surface, pit pond water surface, reed land, tidal flat, ditch, hydraulic structure, glacier and permanent snow cover.

8) Unused land refers to unused land, including hard-to-use land.

Adult damselflies are generally accustomed to moving, foraging, courting, and laying eggs near the waters inhabited by larvae. Due to the difference in species, some damselflies are accustomed to inhabit flowing streams, ravines, ravines, or still water ponds, lakes, swamps, puddles, paddy fields and other waters.

Some like to inhabit rivers and creeks with strong currents. On the whole, the family and the family all appear in flowing waters, while most of the family of microcockroaches appear in still waters, and the family of pipecocks can be seen in both types of waters. Generally, the larger damselflies prefer to rest in the fast-flowing streams, while the smaller ones prefer to stay in the water purification basin.

It is mostly active in grassy ditches, and can be found in most places in China that cover such environments. It is also commonly found in Dar es Salaam, Tanzania, indicating that it does not grow exclusively in temperate climates.

The sea level is the base of 0 meters, and the so-called altitude is the height relative to the sea level, so more than 0 meters is naturally not the ocean.

The plane of the ocean under a standard atmospheric pressure condition is the plane of elevation.