Datang: I was exposed by Princess Changle

Upon hearing this, Li Yunhe replied calmly: "The first question is to ask me, why are there frequent floods in the Yellow River Basin?"

"Yeah, that's a good question! Isn't that what I want to know?" Li Shimin nodded and said happily.

"Then what do you say?" Li Shimin asked curiously.

"Student replied, it is natural that the common people violated the law and wantonly burned mountains and forests and reclaimed wasteland."

"Nowadays the cultivator gains strength, and within the four seas, there are high mountains and ravines, and there are also plentiful rivers and valleys."

"This has also caused the current situation where there are gusts of wind howling, a mountain of rubble as big as a bucket, and hurricanes rolling stones all over the forest."

"Humans follow the earth, the earth follows the sky, the heavens follow the Tao, and the Tao follows nature."

"Ignorant people wantonly reclaim wasteland, which is extremely destructive to the vegetation on the Yellow River Plateau!"

"This has also triggered a series of ecological problems in the Yellow River Basin, accumulating over time and indirectly leading to the current Yellow River flood disaster!"

Li Yunhe replied calmly and eloquently.

"Well, yes, it makes sense!" Li Shimin nodded when he heard the words, and agreed with his face.

Afterwards, Li Shimin asked curiously: "Then what does King Jin say to your answer?"

"My master said lightly that this was just one of the reasons. Then he asked me why the flood broke out at this time, and what caused the flood?" Li Yunhe said calmly.

"Well, that's right! King Jin really got the point. Then how did you answer?" Li Shimin asked curiously.

"The autumn water is here, and the rivers are filled with rivers. The grass people thought about it carefully and felt that it was caused by the continuous torrential rain this summer."

"Master nodded happily. Then he said slowly, the cause of the flood in the Yellow River is far more than this."

Li Yunhe recalled and said lightly.

"Oh? Then what else caused the current flood?" Li Shimin asked curiously with a puzzled expression.

The voice just fell.

Li Yunhe then said calmly and slowly: "Master said eloquently that flood problems like this should be analyzed from two aspects: natural causes and human-made causes."

"The natural causes of frequent floods in the Yellow River are mainly caused by factors such as landform, climate, soil, and vegetation."

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Chapter 326 Governance strategy!

"In terms of geomorphology, the Yellow River Basin is located in the transition zone of various geographical elements, and various geographical elements are intersected with each other, and the ecological environment is relatively fragile."

"In terms of terrain, the Loess Plateau has few flat lands, many slopes, broken ground, and frequent geological disasters such as landslides, mudslides, and subsidences."

"In terms of soil quality, because the loess structure is loose, porous and vertically oriented, the soil material is easily soluble in water and easily eroded."

"In terms of precipitation, the precipitation in the Yellow River Basin is concentrated in the summer flood season, and there are many heavy rains in the summer flood season."

"In terms of vegetation, because the vegetation has suffered severe damage, the surface of most areas is exposed."

The voice just fell.

Fang Xuanling couldn't help but praised happily: "Yeah, not bad! King Jin's analysis is very reasonable, we have never thought about such a problem before!"

"Then what's the artificial reason?" Fang Xuanling asked curiously.

Li Yunhe explained calmly after hearing the words: "My master said that there are four reasons for man-made as follows."

"One is because the economy of the Yellow River Basin in the Tang Dynasty has developed rapidly in recent years, and the population has increased sharply. To solve the food problem, the people have opened up steep slopes, over-cultivated, and a large number of trees have been felled, making the surface unprotected, vulnerable to erosion, and loose. .”

"The second is excessive woodcutter harvesting, deforestation, and destruction of vegetation and trees, making the surface gradually lack of vegetation protection."

"The third is war and building palaces. A large amount of vegetation was burned or felled for building timber."

"Fourth, the excessive use of cultivated land, the cycle of barren makes the surface lose the protection of natural vegetation or crops, thins the soil layer of cultivated land, loses soil nutrients, and reduces the fertility of cultivated land, resulting in a decrease in grain yield per mu."

"These acts of man-made destruction have caused the deterioration of the local ecological environment, directly or indirectly inducing and exacerbating natural disasters."

"In the season of frequent rainstorms in summer, a large amount of sediment flows into the Yellow River, and the sediment content of the Yellow River increases sharply."

"A large amount of sediment is deposited on the downstream riverbed, which raises the upstream riverbed and becomes a suspended river on the ground, which intensifies the impact of the storm and flood on the embankment, and poses a greater threat of flooding."

As soon as the words fell, Li Shimin and all the ministers suddenly realized.

Afterwards, Changsun Wuji asked curiously with a puzzled face, "Then how to deal with the flood in the Yellow River?"

Li Yunhe smiled slightly when he heard the words, and said lightly: "Master just used this question to test me."

"Master said that only by analyzing and clearly understanding the causes of the Yellow River flood, can we better start to solve the cause of the Yellow River flood."

"Then how do you answer?" Li Shimin asked curiously after hearing the words.

Li Yunhe talked calmly and eloquently: "I am frank and right. The water of the Yellow River is very turbid. It is called one stone of water and six buckets of mud."

"We can learn from the historical experience of Jia Rang in the Western Han Dynasty's "Three Strategies for River Control" to make the river wide and slow, to flow floods, to divert the course reasonably, to build canals and gates, to develop irrigation from the Yellow River, to divert floods, to repair and raise the height of the river. Fortify the embankment."

"In addition, in the future, we must avoid competing for land with the river, pay more attention to agriculture and mulberry, and pay attention to the silting, dredging, dredging, soil improvement and drainage of the river."

The voice just fell.

"That's right, your management strategy is very appropriate." Li Shimin nodded when he heard the words, and praised happily.

Li Yunhe was startled when he heard the words, then frowned, and said in a deep voice: "But Master said that this is only a temporary solution, not the root cause, and it is far from enough to solve the Yellow River flood from the root cause."

"You can also solve the flood of the Yellow River by adapting measures to local conditions in his ten strategies for treating the Yellow River."

"One is to plant more trees and grasses, return farmland to forests and grasses, expand the planting area of ​​forests and grasses, increase vegetation coverage, conserve water and soil, and strengthen water and soil conservation."

"Master said this is one of the fundamental measures to control the flooding of the Yellow River."

"Secondly, in the cultivation area, land leveling, cultivation, field management, fertilizer application, rotation and intercropping and the construction of forest protection nets shall be vigorously adapted to local conditions."

"At the same time, carefully select and breed fine varieties, develop plastic film, sprinkler irrigation and drip irrigation technology, scientific fertilization, etc., improve soil fertility, maintain water and soil, and develop scientific agricultural production."

"The third is to close slopes for forestry and grass cultivation and build horizontal terraces in gentle slope areas."

"Fourth is to build check dams, small reservoirs and shelter forests in valleys."

"Fifth is water and sediment regulation, flood diversion and silt release, mechanical dredging of the river, using engineering facilities and dispatching methods, through the impact of water flow, the silt of the Yellow River is sent to the sea in due course, thereby reducing the siltation of the Yellow River bed and increasing the flood discharge capacity. "

"Build a high dam reservoir in the canyon to reduce flood and retain sediment, regulate water and sediment, transport high-concentration sediment, store clear water and discharge mud."

"Flood and sediment are widely used in the watershed, such as diverting floods to flood the land, irrigation with high sand and muddy water, and using dredgers to release silt to strengthen dams."