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2022年内蒙生态调查回顾 | A Review of 2022 Inner Mongolia Forest Ecological Survey

· 博客 Blog


The Million Tree Project conduct forest ecological survey every summer. This year, the volunteers cannot participate the survey due to travel restrictions, but two young interns joined the team and carried on the forest survey work. They are the senior students from Guangxi Ecological Engineering College.

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The two students went to the forest sites with MTP staff very early in the morning when the sun just rose. Walking on the soft sandy land, they felt the landscape around very different from where they come. They walked from one sample site to another and counted the plants in each site to collect data. The numerous plants on the ground symbolized the vitality of the forest.

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被淹没的道路 The road to the forest site flooded

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被淹没的草地 The grassland flooded

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茁壮成长的树苗 The trees grew very strong in the summer


They visited three forest sites and 38 sample sites in a week and counted 19948 plants of 47 species in total. In the meantime, MTP team used the drone to take ariel photos and calculated the vegetation coverage by analyzing the photos. The results showed that the plants grew very well this year. The average vegetation coverage of the four forest sites ranged from 47.95% to 59.85%.  


To learn more from the forest survey, the team added a new element this year, investigating the wind speed in the sites, to understand how different types of vegetation mediate the wind above the ground in the forest sites.

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两位同学在迎风面测量风速 Two interns measuring the wind speed on the windward side


来源:科学出版社《沙漠生态学》赵哈林 著

Deserts are windy areas. Wind has energy, so there are windy and sandy movements driven by the wind energy in the deserts. These movements result in aeolian landforms. When wind meets the vegetation, the vegetation blocks wind. The kinetic energy in wind passes on to the vegetation, so not only the wind speed reduces, but also the wind direction changes. In this way, the vegetation plays a role in mediating the wind.

Source: Desert Ecology by Halin Zhao, Science Publisher


The measurements from the forest survey showed that different types of vegeation affect the wind speed in different ways.

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The vegeation can reduce the wind speed. The lower the vegetation layer is, the more remarkable the effect is. At the height of 0.2 meter, the effect of shrub reducing the wind speed is much more obvious than trees and grass.


At the height of 0.5 to 1 meter, the effect of trees and shrubs reducing the wind speed is more obvious than grass.


At the height of 2 meters, the effect of trees reducing the wind speed is more significant than shrubs and grass.


The wind speed on the leeward side is always lower than the wind speed on the top of the dune and on the windard side, due to the landscape.


Because this is the first time our team measured the wind speed in the forest sites during the summer, the database is limited. We will continue to collect data in other seasons to analyze and to evaluate how our tree planting project affects the regional mircroclimates.