Source: Sichuan Daily - Sichuan Guan News
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Sichuan Guan News Reporter Text/Wang Chengdong Shao Mingliang Picture/Video Hua Xiaofeng
"This place used to be a pool of mud." At 8:30 on November 17, Ziyang citizen Zhou Huafeng was practicing morning at the Sichuan Yuanxiang Cultural Plaza with his old friends. Less than three hundred meters ahead of the square, the water flow slowly drifted downstream. A green space extends to the distance between the square and the Tuojiang River.
The "fresh" hydrological ruler on the pier of the Tuojiang Bridge not far from the square reminds: This summer, the main stream of the Tuojiang River encountered a super strong flood peak. But why is the vitality of plants so tenacious in the desolation zone?
slimming zone refers to the area between the fluctuations and falls of rivers, lakes and reservoirs. Due to uncertain drought and humidity, generally speaking, it is difficult for plants to survive for a long time in the area where the desolation zone is located. However, on the side of the Tuojiang River main stream in Chengdong New District, Yanjiang District, Ziyang , the local area used ecological embankments and successfully used the desolation belt.
A piece of "audio rib land" with alternating drought and flood
is located at the junction of new and old urban areas, but the desolation zone along the river cannot be found for use
"This is the middle reaches of the Tuojiang River, and the terrain is relatively slow. In addition, the left bank of the main stream (in the northern hemisphere, under the action of the local rotation and deflection force, the water flow will erode the right bank and form silt and sand accumulation on the left bank), the area of desolation zones such as river beaches is relatively large." Ziyang City Deputy Director Wu Dengyu said that the desolation bandwidth in front of him is about 300 meters, and it extends throughout the Yanjiang District.
, this area has been destroyed for a long time. According to the relevant person in charge of Zhouci Community, Yanjiang Town, Yanjiang District, Ziyang, in order to make use of these depletion belts, the local area has been thinking of ways. But none of them ended in failure. The reason is that the local area has never been able to overcome the two obstacles of alternating drought and flood and water quality.
"I have built vegetable gardens and fish ponds before, but they have not yet finished it. I can only grow a few reeds." Zhou Liang, a resident of Zhouci Community, Yanjiang Town, Yanjiang District, introduced that the flow of the main stream of Tuojiang River is extremely different in seasonal and interannual periods, and it is difficult for agricultural industries to withstand the risks. If you build a green space, you need to solve the water quality problem - "The water is too smelly, and no one comes after the green space is built."
But these deterioration belts cannot be managed without treatment. The dividing line between the Ziyang East New District and the Ziyang Old Town District built in 2009 is the main stream of the Tuojiang River. In the eyes of citizens who come and go every day, this "small" plot of "doing nothing can be done" must find a suitable way out. Over time, even nearby villagers didn't care about this depletion zone - the accumulation of construction waste, littering and discharging of sewage, making this land even more "unsparing".
"Every year, the two sessions of the city, we will receive suggestions from a large number of representatives and commissioners. On the government website, citizens have many problems with urban depletion and decline." A relevant person in charge of Ziyang Municipal Water Affairs Bureau introduced that before the implementation of river chief system , the local government has not found a way to make this "scattered rib" rationally utilize.
A "rebirth road" of "dividing and conquering"
Control the source of pollution, divide three utilization lines, and open up a new paradigm of ecological embankment
There are two roadblocks in front of the utilization and desolation belt: improve water quality and create conditions for the next comprehensive utilization; find an ecological model that adapts to the natural conditions of the desolation belt.
The former, with the help of central and provincial environmental protection inspections, especially after the comprehensive establishment of the river chief system in 2017, Ziyang City immediately started the comprehensive management project of the Tuojiang main stream in the urban area and started to improve water quality.
"In the past, we buried a pipe and discharged water into the river. Now, we are all sent to the sewage treatment plant through the pipeline." Liu Jie, who works in the catering business in Chengdong New District, said that, with the help of the rain and sewage diversion project implemented by the city, residents along the river completely bid farewell to the direct discharge of sewage.
solved the water quality problem. Ziyang City invited provincial experts in agriculture, forestry and other fields to explore the construction of ecological embankments - that is, a new model of greening of the desolation belt.
"The general principle is that plants can survive in this environment and do not have to be too big. This will not affect the flow of the river."A relevant person in charge of the Water Affairs Bureau of Yanjiang District, Ziyang introduced that when exploring relevant models, in order to make the plant species more accurate and diverse, the local water affairs department has initially framed three utilization lines based on previous hydrological data - the flood flooding line once in 10 years, the flood flooding line once in 30 years, and the flood flooding line once in 50 years. The reason is that the smaller the flood recurrence period, the stronger the vegetation's moisture and water resistance must be.
In the winter of 2017, in the forestry and agricultural departments, according to the environmental characteristics of the three utilization lines, selected more than ten adaptable plants respectively. As the main force in ecological embankment construction, the evergreen and deciduous vegetation mixed and matched.
"If you go here, there are three observation decks. The height of the platform is three lines. The vegetation within each line is different. "Zhou Hua, who has moved to the riverside for 5 years, said that within the three lines, near the top of the dam are metasequoia, and down there are reeds, reeds, reeds and and other aquatic plants, which can not only survive in the special environment of the desolation zone, but also beautify the environment.
has no sewage and green belts. Now, Shurenyuan Township Cultural Square has become a popular recreational place for local residents.
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