Extra points about rocky desertification areas? relevant information

Rocky desertification refers to the phenomenon of land degradation in tropical and subtropical humid and semi-humid climate conditions and the natural background of extremely developed karst, which is disturbed by human activities, so that the surface vegetation is destroyed, resulting in serious soil loss, large area of exposed bedrock or gravel accumulation. This is also an extreme form of land degradation in karst areas.

Typical case:

In Guizhou, many places have to consider "ecological migration", and Mashan area in Guizhou Province is a typical example. According to the survey, there are about 450,000 people who need to emigrate due to ecological deterioration in karst rocky desertification mountainous areas of Guizhou Province. The area of light rocky desertification in Guizhou Province is 35,920 square kilometers, accounting for 20.39% of the national territory. Among them, the area of light rocky desertification is 22733 square kilometers, the area of moderate rocky desertification is 105 18 square kilometers, and the area of severe rocky desertification is 2669 square kilometers. In addition, there are 437 14 square kilometers of land with potential rocky desertification trend. Judging from the distribution of rocky desertification in county-level administrative units, there are obvious rocky desertification phenomena in all counties (cities) except Chishui, Rongjiang, Congjiang, Leishan and Jianhe. In terms of spatial distribution, rocky desertification land is mostly distributed in the south and west of karst development, with Liupanshui, Southwest Guizhou, Qiannan, Anshun and Bijie having the largest area, showing the characteristics that the south is more important than the north and the west is more important than the east. Divided by county-level administrative units, rocky desertification area; There are 9 counties that account for more than 40% of the land area, less than 10% in 17 counties, and the rest are between10% and 40%. Among the 50 key poverty alleviation and development counties in Guizhou, 30 counties have rocky desertification areas accounting for more than 20% of the country's land area, and the places with serious rocky desertification are the poorest places in Guizhou.

By the end of 2005, the total area of rocky desertification land in China was 654.38+296,000 square kilometers, accounting for 28.7% of the karst area.

Guangdong, in Guangdong, 2 1 county (city, district) is plagued by rocky desertification. The karst area of the whole province is 15968490 mu, of which the rocky desertification area accounts for 45.6%, which is distributed in Ruyuan, Lechang, Yangshan, Yingde, Li Anping, Huaiji, Yangchun and other counties (cities).

"The rocky desertification areas in Guangdong are mainly distributed in the middle and upper reaches of Dongjiangyu, Xijiang and Beijiang, and the ecological location is very important." Xue Chunquan, dean of the Ecological Branch of Guangdong Forestry Investigation and Planning Institute, said that the Beijiang River basin accounts for 95% of the rocky desertification area in the province.

For the villagers in Nandong Village, shaping town, Lechang City, "rocky desertification" is a new word. Living in shaping town, one of the poorest areas in Guangdong, the serious rocky desertification makes the villagers feel helpless in their efforts to change poverty.

Due to the serious water shortage caused by rocky desertification, they can only get a little dry land per capita in the rainy areas in the south, with an annual output of several hundred kilograms of corn.

Like other places in Shaping, villagers in Nandong Village grow a lot of yellow smoke. Due to the high altitude, too little water and poor land, the yield of yellow tobacco per mu in Nandong Village is obviously lower than that in other areas.

In Guangxi, rocky desertification is the result of extreme land degradation in karst areas, and it is the number one ecological problem facing Guangxi. According to Chen Qiuhua, director of Guangxi Forestry Department, karst landforms are widely distributed in Guangxi. The karst area in the whole region is 65.438+0.25 billion mu, accounting for 35.2% of the total land area, involving 779 townships (forest farms) in 76 counties (cities, districts) of 654.38+00 cities. Among the land areas in karst areas, rocky desertification land reaches 35.68 million mu, ranking third in the country, second only to Yunnan and Guizhou. The population of karst area is more than 0/2 million, accounting for about a quarter of the total population of Guangxi. Due to the serious rocky desertification, the local economic and social development is very backward, and more than 90% of the poor people in Guangxi are distributed in rocky desertification areas.

The rocky desertification of 2.2 million mu of land in Nanyang, Henan Province may affect Danjiangkou Reservoir.

For people in the Central Plains, rocky desertification is a distant and unfamiliar term. Nowadays, rocky desertification really happened in the Central Plains.

Not long ago, the Provincial Forestry Department reported that there was rocky desertification in 2.2 million mu of land in Nanyang.

These rocky desertification lands in Nanyang not only can't grow plants, but also affect the draft safety, especially threaten Danjiangkou Reservoir, the water source of the Middle Route of South-to-North Water Transfer Project.