both hands and climbing along the small stone steps cut on the steep wall, 54-year-old Liu Yanlin climbed to a narrow platform less than one meter wide halfway up the mountain, almost sticking to the stone wall. "This is a'micro-landform utilization patent verification test area 'and a nutritional'supply station' for lianas on their way to long-distance climbing.". "We create the right water and soil conditions for the terrain, hoping that when they reach this height, they can take root. We also plant several vines here to give them a chance to cover the higher parts of the mountain."
Liu Yanlin inspected the growth of woody vines in the "Micro-landform Utilization Patent Verification Test Zone" halfway up the mountain. Photographed
by Su Kaiyang, a reporter from Xinhua News Agency, in late spring and April, the western mountainous area of Shijiazhuang is green. As a technical specialist in the field of ecological restoration of mine geological environment, Liu Yanlin, who works in the Land and Resources Exploration Center of Hebei Geological and Mineral Exploration and Development Bureau, once again came to the familiar test site to inspect the growth of plants.
This test site in the mountains, located in Donghushen Village, Bailuquan Township, Luquan District, Shijiazhuang City, was originally an abandoned mine. The reporter drove all the way to the working platform, carefully walked through the steep slope full of gravel, and then followed Liu Yanlin here.
"This is a key research and development project in Hebei Province, which we have declared in cooperation with Hebei Agricultural University and Beijing Academy of Agricultural and Forestry Sciences, aiming at integrating a set of key technologies for the management of" white stubble mountain "and providing important technical support for the ecological restoration of mine geological environment in Hebei Province." Liu Yanlin said proudly. Looking up, surrounded by a 240-meter-long cliff, the white mountain with bare rocks is almost vertical, the highest point is about 70 meters, the vines distributed at the bottom are flourishing, and the highest kudzu vine has climbed to nearly 30 meters.
This is a test site located in Donghushen Village, Bailuquan Township, Luquan District, Shijiazhuang City. Photographed
by Su Kaiyang, a reporter from Xinhua News Agency, extensive mining in history left a large number of steep sections with exposed rocks in open-pit mines, also known as "White Stubble Mountain". This ecological "scar" has also become a hard nut to crack in the restoration and management of the mine environment.
"We are here to conduct plant screening tests.". Nine woody vines, such as Parthenocissus tricuspidata and Wisteria sinensis, were planted under eight slope aspects, and different growth conditions such as soil thickness, irrigation and fertilization were simulated. Liu Yanlin said that during the experiment, there was 24-hour care by staff in order to select the most suitable "plant doctor" for the treatment of "white stubble mountain".
Because of the steep slope and poor soil and water storage capacity, "White Stubble Mountain" has almost no plant growth conditions, and its ecological restoration has always been recognized as a technical problem in the industry. For Liu Yanlin, who was engaged in engineering geology and environmental geology in his early years, the work of mine environmental restoration is very challenging. "This is a highly professional work, which involves the knowledge of geology, hydrology, environment, soil and water conservation, mechanics, agronomy and even aesthetics. It can be said that business learning is always on the way."
In order to collect first-hand data, Liu Yanlin and his colleagues have irregular working hours, irregular life and rest, and common exposure to the wind and the sun. "If we need to observe the growth of plants at close range, we will climb to its height. If we need to monitor the damage of insects to plants at night, we will continue to work at night."; If we need to carry out photosynthetic experiments in midday sunshine or observe the impact of topography on soil erosion during heavy rainfall, we will operate according to the needs of scientific research, and will not consider whether we are tired or not. Liu Yanlin said.
This is Liu Yanlin inspecting the growth of Amorpha fruticosa seedlings at the site of a completed mine environmental restoration and control project. When Qu Lanjuan, a reporter from Xinhua News Agency, went down the mountain
together, the reporter found that Liu Yanlin's shoes were unusual. These are not ordinary hiking shoes. We often walk in the mountains, where there are piles of stones everywhere. Shoes should be skid-proof, wear-resistant and puncture-proof. This toe box is hard shell and lined with steel plate. Roughly speaking, he has worn out nearly 100 pairs of shoes, because once the soles are worn through and cracked, there will be potential safety hazards. In January
2022, Liu Yanlin, as one of the main drafters, formally implemented the Technical Regulations for Planting Wooden Vines on High and Steep Rock Wall Greening, which became the local standard of Hebei Province. As a successful exploration of the key technology of vegetation restoration in "White Stubble Mountain" of Taihang Mountains, it provides valuable experience for mine restoration and management in northern China. Data from the Department of Natural Resources of
Hebei Province show that in the past five years, 3877 mine sites have been restored and harnessed in Hebei Province, covering an area of 319.4 million mu. The environment of abandoned mines has been effectively improved, and some of them have become tourist punch cards, industrial parks or agricultural demonstration zones.
"I remember 20 years ago, when I was walking in the western mountainous area of Shijiazhuang, I was often covered with dirt and mud, and the car was filled with dust.". It is now lush and green, and has become the'back garden 'of the city. We often observe creatures like fireflies, which are very demanding on the environment. In Liu Yanlin's view, this is the best reward that nature has given to himself and his colleagues for their hard work.
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