Researchers at Lanzhou University have made a series of progress in the research on the research on the construction of large -scale vegetation construction of the Loess Plateau

The Loess Plateau, located in the Yellow River Basin, has a very important position in my country's economic and social development and ecological security. It is also the focus of the ecological protection of the Yellow River Basin and high -quality development of major national strategic focus. In order to improve the coverage of the Loess Plateau and the control of soil and soil, the country has implemented the implementation of the forest (grass) project in the 1990s. Since the implementation of the project for more than 20 years, a large amount of sloping land has been converted into grassland and forest land. The level of regional vegetation coverage has increased significantly, and the yellow mud sediment has been significantly reduced. Vegetation construction can have an impact on the hydrological climate of the Loess Plateau by changing the type of land use type, vegetation coverage and surface reverse rates. How to scientifically evaluate and understand the large -scale water climate effect of the large -scale vegetation construction of the Loess Plateau is a hot scientific issue that has attracted much attention.

Studies have shown that the return of farmland to forests (grass) projects has caused the regional steaming water consumption to increase sharply, consumed the original limited water resources, resulting in sharp decrease in the yellow mellia flow, which exacerbates the regional drought and water shortage trend. However, these existing conclusions only consider the hydrological effects of the land surface one -way, and ignore the feedback effect of the regional climate. The construction of large-scale vegetation can affect the interaction between the atmosphere-land surface by changing the characteristics of the land surface, and then affect the regional climate. The changes in the regional climate will further affect the water and heat distribution of the surface of the surface, and then have a new impact on the hydrological processes such as land precipitation, steaming and distribution, vegetation cutting, and soil seepage. When evaluating the impact of large -scale vegetation construction, the two -way role of land and atmosphere is needed at the same time. However, the feedback effect of large -scale vegetation construction on the Loess Plateau at present is unclear, and the impact of large -scale vegetation construction on regional climate needs to be answered urgently.

In response to the above -mentioned scientific issues, the team of young researchers at the Green Development Research Institute of the Yellow River Basin of Lanzhou University, Professor Zhang Baoqing's team carried out a numerical simulation research on the hydrological climate of the Loess Plateau, and the relevant research results were continuously published on the local academic journal Journal of Geophysical Research: Atmospheres. Study based on land gas coupling models, poly source remote sensing observation data and climate re-analysis data, quantitative assessment of the impact of large-scale vegetation construction on regional temperature, precipitation, water vapor transmission, and water vapor-precipitation conversion. The response mechanism of the plateau returning farmland to the forest (grass) project mainly obtained the following two scientific understanding.

First, the turmoil caused by large -scale vegetation construction has caused a significant decrease in the reverse illumination rate, which has caused increased net short -wave radiation, which also leads to an increase in heat flux. Although the potential heat flux has also increased significantly, in terms of inter -annual scale, the energy process caused by the energy process caused by the radiation effect is stronger than the energy processes caused by non -radiation (steaming). Temperature increase effect (Figure 1).

Figure 1: The large -scale vegetation construction of the Loess Plateau on the regional temperature impact mechanism diagram

Second, the construction of large-scale vegetation has significantly increased the regional steaming, making the atmosphere of near the surface more moist, enhancing the positive feedback effect of soil moisture-vegetation-precipitation room, leading to strong water vapor spokes and increased clouds, increasing the recycling of precipitation and recycling Rate, and strengthening the regional atmospheric water circulation, eventually caused vegetation to have a positive effect on the increase in the amount of drop in the Loess Plateau (Figure 2).

Figure 2: The large -scale vegetation construction of the Loess Plateau on the influence mechanism of the regional atmospheric water circulation

The above research work provides a new perspective to understand the regional climate effect of vegetation construction in the Loess Plateau, which helps to deeply understand the impact of artificial afforestation on the regional climate, and to explore the interaction relationship between human activities and climate. The ecological protection and high -quality development of the Yellow River Basin, as well as sustainable management of vegetation restoration and reconstruction, has important theoretical and practical significance.

The thesis link:

Large-SCALE AFFORESTATAN Enhances Precipity by Intensifying The Atmospheric Water Cycle Over The Chinese Loess Plateau

https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022jd036738

Large-SCALE AFFORESTATAON OOVER the LOESS PLATEAU in CHINA Contributes to the Local Warming Trend

https://agupubs.onlinelibrary.wiley.com/doi/full/1029/2021jd035730

Source | Propaganda Department of the Party Committee of Lanzhou University (Lan University News Network)

Edit | von Yifu

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