Shuyun was a little thirsty, took a sip of water, and then continued: "With the continuous reproduction of human beings, not only did the population of the middle and lower reaches of the Yellow River increase, but people also learned to build houses and cultivate farmland. This necessitated extensive felling of trees, and the destruction of pastures. That's why the original clear water of the Yellow River has become what it is now, full of sediment and turbid. ”

Kangxi frowned and said, "You mean that because of the decrease in plants, the Yellow River will continue to flood?" ”

"Let's just say that, of course, this situation didn't happen overnight. Human civilization, whether it is the preservation of fire, artificial fire, hunting, building houses, heating, cooked food, all have to do with wood. And it is precisely because the trees seem to be too common, and they can be seen everywhere. And the flammability and indestructibility of wood make people ignore its importance. In fact, plants can not only maintain water and soil, but also prevent wind and sand fixation.

At that time, Chang'an City, the ancient capital of the Han and Tang Dynasties, was large in scale and flourished for a while, but many later dynasties changed several times, but they were all abandoned. Lack of water is one of the most important reasons, after nearly a thousand years of development, the construction of palaces and houses, and the increasing population, all of which have caused serious damage to vegetation, environmental degradation, and a decrease in water sources. There is also the legendary Loulan Ancient Kingdom in the Western Regions, which is also because it does not see the importance of plants, and constantly cuts down, but does not replant, so this legendary extremely beautiful and rich Western Regions power was buried by yellow sand overnight, resulting in the destruction of the country. ”

Hearing this, Kangxi was shocked and shocked. muttered in disbelief, "I didn't expect it, I really didn't expect it."

"I'm not alarmist. Many of the changes around us happen unconsciously, when people wake up. It's often too late. Take our capital as an example, in the autumn and winter seasons in recent years. There are always days when the wind and sand are particularly strong, which has never been done before, because the Mongolian grazing population has been expanding and the pastures have been destroyed. These seemingly ordinary flowers and trees are actually closely related to the survival and development of our human beings. ”

Shuyun looked at Kangxi, who was listening to her story with a serious face, and continued: "So the first point I put forward to control the Yellow River is to extensively plant trees and grasses on both sides of the Yellow River and in the basin, focusing on the Loess Plateau, 'returning farmland to forest, returning grazing land to grassland', and restoring vegetation." This is a fundamental solution to reduce the amount of yellow sand entering the country. This method is great for many wind-blown sands. It is suitable for areas with few water sources and frequent floods and mudslides. Of course, this is also a long and slow process, '10 years of trees, 100 years of people.' Maybe our generation can't do it all, and we need our future generations to continue to work hard. However, 'the merit is in the present generation, and the benefit is in the future.' Our future generations will benefit from this. ”

Kangxi frowned and thought for a long time, then asked, "Is it really because the plant was destroyed?" How do you know the Tao? Shuyun, it's not that I don't believe you. If you do what you say, a lot of farmland will be expropriated. What about those who have lost their land and homes? I need a strong reason to explain to the Manchu civil and military and the people of the world. ”

Shuyun thought for a moment and said, "According to the changes in rock strata and geology, what I said can be reflected. But the ministers and the people don't understand this, and even if they tell them, they don't necessarily believe it. ”

Shuyun was a little embarrassed. Then he pondered for a moment before saying, "When I have a question that I don't understand, I always ask myself questions." Many problems will also be solved. So now I'm going to try to explain it in this way.

First of all, before the summer. The record of water control started from Yu, but there was no reason for what to do before? Emperor Yan is known as "Shennong's". Teaching people to sow seeds and harvesting ushered in the era of agriculture. This means that people did not cultivate farmland until now. So what do they feed on, I think it must be nothing more than fishing and hunting. It was precisely because of Emperor Yan that people began to cultivate farmland and build houses to settle down. This requires large areas of flat, fertile land. Therefore, the destruction of forests and pastures is inevitable.

Xuanye, have you found a phenomenon, starting from Yu, after generations of development, the number of floods of the Yellow River is increasing, but its water volume is decreasing year by year, and even the phenomenon of interruption has occurred in the past hundred years. These questions will be discovered as long as you look through the history books. What is the reason, everything has a reason, right? Moreover, why did most people live in the Central Plains of the Yellow River Basin in ancient times? No one is stupid, and who wants to live there if it's not good and floods are frequent? It is because of the abundant water, abundant products, warm climate, fertile land and many other benefits. People will build it as a home. ”

Kangxi obviously understood, and didn't need Shuyun to continue to explain, so he nodded and continued Shuyun's words, "Yes, whether it's nomadic or farming, it's inseparable from water." Presumably, people at that time would not have dug wells like they do now. In addition, if you want to irrigate a large area, a few wells are not enough. Living along the river is a natural choice. In addition, it is difficult to survive the winter without adequate clothing, and it is also necessary to live in a warmer climate. There are too many people, and it is not uncommon for this situation to be caused today. ”

Then Kangxi clenched his fists and said, "'Return farmland to forest, return grazing to grassland.'" The merit is in the contemporary, and the benefit is in the future. "That's right, Shuyun, I've decided. No matter how much resistance I encounter, I will continue to do it. ”

Shuyun held Lao Kang's hand and said with a smile, "Xuan Ye, I believe you will be able to do it." You will bring a good living environment to future generations, and they will always be grateful to you. ”

Kangxi nodded solemnly. Obviously, Shuyun is very good at seizing the opportunity, and with a word, he inspired this extremely proud and somewhat arrogant emperor in his heart.

After a while, when Lao Kang's mind calmed down a little, Shuyun said again, "What I said above is a long-term plan. At present, the river control strategy to be adopted is "blocking, draining, removing, digging, and comprehensive treatment" and other measures, which can properly solve the sediment problem by treating both the symptoms and the root causes, and combining near and far. Adopting the principle of "blocking the upper and lower discharges, and separating the two sides of the strait" can effectively control floods. The organic combination of the two is to form an engineering system for flood control and silt reduction. Divert water into the Yellow River, so that the flow rate and the sediment content are compatible, and only the "big water belt and big sand" can achieve the best sediment transport and siltation reduction effect. The second is the construction of large-capacity reservoirs, which can effectively control and regulate the water volume of the Yellow River. ”

Then Shuyun began to write and draw on the paper again, and told Kangxi about the construction method and function of the reservoir, and also roughly pointed out the location where each reservoir should be built based on the information of the previous life. As for whether the location is correct or not, and the specific design plan of the reservoir, it will be determined after a specific inspection by river officials and craftsmen. After all, 'there is no voice without investigation'. Shuyun did not inspect the entire basin of the current Yellow River, which was later diverted. Besides, you can't do everything alone. Everyone does things, and everyone shares the credit. This is the best reason in officialdom.

After Shuyun said this, she pondered for a moment. He also wrote down the manufacturing method of cement and handed it to Kangxi. Shuyun actually didn't want to let cement come out so early, after all, there is no dust removal and environmental protection equipment now. The production of cement can cause great harm to the environment and the health of workers. But you can't build a reservoir because of choking, you can't do it without cement.

So Shuyun emphasized to Kangxi, "Although this cement is a very good building material, it is widely used, whether it is to build houses, bridges, roads, or embankments, it is very easy to use." However, in the production process, the water source and "Shuyun wanted to say air, but after thinking about it, people at this time still didn't know what air was in the Dao, and when Lao Kang asked, he had to struggle to explain, and it was not good to say too much to Kangxi at one time, and it would be too prominent for Shuyun to be too prominent.

So after a pause, it was changed to "and people's bodies are harmful." So Shuyun implored the emperor to be sure to put the production site away from the crowd and wear masks for the workers. Also, Xuanye, you must promise me" Shuyun looked at Kangxi seriously and said heavily, "If you have to, don't produce cement on a large scale." ”

Kangxi saw that Shuyun was so serious, and he also knew that Lu Dao was very important, and Shuyun was always thinking about himself, so he solemnly assured Shuyun.

Then Lao Kang said, "Shuyun, these river control strategies you said are very practical, but there are too many contents, and I can't remember them all for a while." In this way, it is better for you to write down all this you said, and then I will take it back to the palace and Jin Fu to study it carefully. ”

As soon as Shuyun heard this, she immediately stopped cooking. "Oh, Xuan Ye, I was too tired just now, I can't do it, I have a headache, and the baby in my belly is not comfortable." "It's not because Shuyun is lazy and doesn't want to write those strategies. Instead, I want Lao Kang to feel that she is an ordinary little woman, who will be tricky and lazy. Although he is erudite and talented, he is also very righteous. But there are also many disadvantages. Such a talent can make Lao Kang, a suspicious emperor, more at ease and loved.

Lao Kang got angry when he saw Shuyun's lazy appearance, and you are lazy, you are lazy, and you even talk about the child in your belly, what kind of person. I really want to slap her ass twice. But looking at the round belly, I really can't get my hands on it.

After enduring it and enduring it, I still couldn't help but yell, "You will pretend, you will sit down for me." You say, I'll write it. ”

Shuyun grimaced and wailed, "Huh? And say, oh my God? Still don't let people live? My heart was so broken that I took it out like dumpling filling. ”

Kangxi "fluttered", amused by Shuyun's words, and shook his head helplessly, "It's all messy, you just follow me to be poor." Don't be fooled, say it."

Shuyun began to talk to Kangxi about the conditions with a flattering face, "Let me say it again, but you have to promise me one condition." ”

Lao Kang is so angry. Who just begged me to tell me about this river business? Oh, wait until I get it to life, it's just for you to repeat it again. In the blink of an eye, he began to make conditions with me. ~ I want to see what conditions you Qi Shuyun wants to put forward to me. ～

So Lao Kang shouted out a word "say" with a calm face.

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