The city walls of Summer State City were all made of loess. Not a single stone was used from the beginning to the end. However, when they were first built, they were very strong. Even a city wall made of stone might not be comparable to them. Naturally, the cost of a loess city wall was much cheaper than a stone city wall. Therefore, this was a very cost-effective way to build a city. It was very suitable for the construction of city walls in areas that lacked stone materials.
Of course, the current Tang dynasty already had a more cost-effective cement concrete material. It was better than using loess and stone. In fact, the cost was not high. This was because if a city wall was built with concrete, it only needed to be poured on the outermost and innermost sides. The middle could be directly filled with loess, or it could be used as a house. In short, concrete was definitely the best way to build a city. Moreover, with the development of railways, every city could obtain this kind of advanced building material at a lower cost. Thus, a relatively strong city wall could be obtained at the lowest cost.
Standing on the city wall of Summer State City, Ang Lee looked at the scenery outside the city. Next to him was Li Hanlu, who was accompanying him.
A breeze blew, causing Ang Lee's hair to flutter. Li Hanlu's hair also danced in the wind. Because it was the wind of early spring, it was a little cold. However, it was not cold enough to make people feel uncomfortable. It was a kind of wind that was not very comfortable.
There was a lot of vegetation outside the city, but it wasn't a lot. It appeared to be very sparse. This was different from the historical records of the Huxia Empire. According to the historical records, when the Huxia Empire built Tong Wan City, it was surrounded by abundant water and grass. It was an excellent environment with a pleasant climate. Otherwise, Helian Bobo wouldn't have chosen this place as the capital. The fact that he chose this place was enough to show the importance of this place. It also showed that the scenery of this place was very beautiful.
"There are sparse poplar trees and some weeping willows. In this season, these trees are bare. It makes people feel desolate."
Ang Lee looked at the small amount of vegetation outside the city and said.
Due to the increase of human activities, the environment here had been greatly damaged. For hundreds of years, this kind of damage was getting worse day by day. At this time, there was already a trend of desertification. If it was not treated, in another few hundred years, this place would really become a desert.
As the Huxia Empire designated this place as the capital city, the number of people who gathered here gradually increased. The environment began to be destroyed, and the continuous war made the surrounding area even more desolate. After the Huxia Empire was destroyed, the population here decreased, but there were still some people who lived here. Moreover, the destruction of the war was really great, causing the environment to change greatly. Later, in order to feed themselves, the people who lived here had to cultivate the land. After the population increased, they needed to expand the area of cultivated land. In this way, the ecological environment was constantly destroyed, and the ecological environment became worse and worse. Naturally, desertification followed.
"Yes! The trees in the north are like this. Once the weather comes, their leaves will fall. I heard from Man Man that there are many trees in the south that are green all year round. "
Li Hanlu said.
Ang Lee nodded and said, "Not only that. Some areas in the south don't have four seasons. There are only rainy and dry seasons. During the rainy season, it often rains, and the rivers can't hold it. During the dry season, there is no rain for several months, and many plants will be dried up.
"Rainy and dry seasons? That must be the wilderness far away in the south."
Li Hanlu said.
Ang Lee nodded in agreement and said, "There are indeed more evergreen plants in the south, but there are very few in the north. However, many of the evergreen trees in the south can be planted in the north. This way, the winter in the north won't be monotonous."
While strolling around Summer State City, Ang Lee found that there were almost no green plants on the roads inside Summer State City. This had a great impact on the environment. After all, with green plants, the city would look more vibrant. If all the roads in the city were bare trees, it would give people a very desolate feeling. This also had a great impact on people's mood. It would make people feel extremely bad, and even cause people to have symptoms of depression.
In the inner part of the capital, the trees on both sides of the road were mostly deciduous shrubs, such as weeping willows. These kinds of plants would be bare in the winter and would not have any vitality. However, some of the roads were planted with trees that were evergreen all year round. This would make the city seem very lively and lively all year round. For example, around Peace Square, there were many evergreen trees planted. Many of them were planted by the merchants of the shops themselves. This was also to better attract customers and for profit.
In Ang Lee's mind, evergreen plants should be planted on both sides of the roads in all cities, instead of shrubs that would lose their leaves in autumn. This had almost become a standard in later generations, but it had not been popularized in this era of the Tang dynasty. The plan to promote the evergreen trees on the roads in the city began to brew in Ang Lee's mind. It could be implemented at any time.
However, this was destined to be a long-term project that could not be completed in a short time. After all, there were so many cities in the Tang dynasty, and there were too many trees in them. Some trees had a history of hundreds of years. It would be too cruel to cut them down just like that, and it would destroy the sense of history of a city. Therefore, this needed to be carefully planned. The small trees could be cut down and replaced with evergreen trees all year round. It would be best if they were of good quality, and the low-quality evergreen trees were not needed. As for the deciduous trees that were more than a hundred years old, they should be preserved. It was really not easy for these trees to grow for so many years. Only with old trees could a city have a sense of history, and a city without old trees would appear to have no cultural heritage.
Historical background was very important to a city. A city with a historical background would give people a sense of belonging. It would make people's spirits have a good home. However, a new city wouldn't have this kind of feeling.
A sense of belonging was a very important thing. With a sense of belonging, people would be able to unite better and work harder towards the same direction, thus making a city more vibrant and lively.
"You're right, my husband! Take our mansion for example. Except for the orchard, most of the trees are evergreen all year round. It's really comfortable to stay here. Sometimes I even forget what season it is. "
Li Hanlu said with relief.
In his home on the outskirts of Chang 'an City, Li An had planted a large number of precious trees. Most of the trees in his residential area were of good quality and evergreen all year round. In the other yards, there were some deciduous flowers and trees. After all, some excellent trees and trees would lose their leaves in autumn, especially flowers and trees, which would lose their leaves almost as soon as winter came. However, these flowers were of great help to decorate the yard, so they had to be planted.
Ang Lee also found a very good way to let these flowers and trees not be seen in winter, but in spring, they could be appreciated.
This was naturally the flower pot technique. Planting precious flowers and trees in large flower pots. In spring, people could enjoy the flowers to their heart's content, and their mood would be better. In autumn, when the leaves fell, they could let the servants move all the flower pots in the yard away and store them in the corner of the yard where they were not often visited, so that they could be appreciated again in the next year. In this way, they could do both.
Of course, after all, this was Ang Lee's own home, so he could be so capricious. However, if it was on both sides of the roads in the city, it would cost too much to use this method. Naturally, he could do it in the prosperous areas of the capital, but forget about the other places! It was more reliable to plant trees that were evergreen all year round.
"Your husband feels that the streets of all the cities of the Great Tang should be lined with trees that are evergreen all year round. This way, when one strolls through the streets in the city during the winter, one will be able to see green. This will make one's mood very good. The roads outside the city can also be lined with trees. That's right, the sides of all the railroad tracks should also be lined with trees, especially in the desert. This way, the scenery along the road won't be so monotonous. We can even plant some Desert Poplar Trees in the Summer Province."
Even in summer, Xia Xia should not be a problem, "Ang Lee said.
In Summer, we can also plant some Poplar Trees in Summer City. "The resources of the Tang dynasty were limited, and the construction of the railway had consumed too many resources. Therefore, after the construction was completed, there were no trees with swords on both sides of the road. This was obviously not suitable, especially in the desert area. Tall trees should be planted on both sides of the railway. For example, the tall, drought-resistant Poplar Trees were very good trees. It was most suitable to plant them on both sides of the railway in Summer City.
In addition, since the people of Summer City already lived in Summer City, they should plant more trees, especially drought-resistant trees like the Poplar Trees. Only in this way could the ecology here be restored as soon as possible and the environment of Summer City return to its original appearance when Helian Bobo built Tong Wan City.
This was not Ang Lee's fantasy. The afforestation project of later generations had indeed played such a role. It was said that there was a very, very large desert. Originally, there was yellow sand everywhere, and human beings had no way to survive. However, under the organization of the imperial court, a large group of people entered the desert and used the artificial forest method to destroy the large-scale desert, turning the desert into a forest. This was simply an incredible miracle, but it was really done. As long as the method of afforestation was adopted, the desertified land could be turned into a forest again. Under certain circumstances, when human beings united, they could defeat some natural phenomena.
Li Hanlu nodded and asked softly, "Why are you planting so many Poplar Trees?"
Ang Lee pointed to the sand and dust in the distance from time to time and said, "Madam, please take a look. The climate here is already quite bad. When the wind blows, the sand and dust float up. This kind of environment is definitely not comfortable for people. It was not like this before. A few hundred years ago, this place was a paradise with abundant water and grass, but now there is a phenomenon of desertification. If this situation is allowed to develop, in a few hundred years, this place will become a real desert, and it will not be habitable. The people here can only leave their hometown and live in other places.
Since ancient times, many cities were built in deserts. Even in movies and TV series, there were scenes of a grand city standing in the middle of a desert. This made people very puzzled. There were many places to build a city, so why build a city in the middle of a desert? The environment in the desert was not very good. There was flying sand everywhere. There was no environment worse than here.
In fact, no one would choose to build a city in a harsh desert. This was a very stupid approach. Most of the time, cities in the desert were built before. When the city was built, this place was not a desert. At the very least, it should be an oasis with a water source. The city was built on an oasis. However, due to the continuous deterioration of the environment and the destruction of war, the environment outside the city became more and more desertified. From a distance, it looked like a city standing completely in the desert.
However, in the interior of such a desert city, there were usually oases and water sources. Therefore, even though there was sand everywhere outside the city, it was enough to have an oasis and water source in the city. This was also very beneficial for defending against foreign enemies. Other than sand, the enemy could not obtain anything useful outside the city. Once the fresh water they carried was cut off, it would be a dead end.
"Planting trees can make the Summer Province return to the previous Summer Province with abundant water and grass? It's that simple? "
Li Hanlu obviously did not dare to believe it. After all, she had never heard of such a thing. Naturally, she did not dare to believe it. Even everyone in this era would find it hard to believe.
"Simple? It's not simple! Planting trees in desertified land is not an easy task. It requires a lot of manpower and financial resources. Each tree has to be watered by water from far away. How can it be a simple task to ensure the survival of the trees? Without perseverance, how can it be done? "
Ang Lee said.
"There are tens of thousands of people in the Summer Province City. If one person plants one tree, that would be tens of thousands of trees. As long as we plant trees every year, we can completely turn the desert here into a forest. Moreover, the Desert Poplar is a local tree species here. First, we will carry out some seedlings and then distribute them to the people. Let every family plant trees.
That's not difficult at all. "Li Hanlu said in a relaxed manner.
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