Everyone began to talk about it, each expressing their opinions, and everyone had different opinions, Zeng Lu said thoughtfully: "I think the ancient country of Loulan disappeared in a vigorous war, because Loulan is a rich and fertile city-state, the country is rich and the people are strong, the people live and work in peace and contentment, 2000 Its location is particularly important, located on the main road of the Silk Road, so this is the place where the soldiers must fight, as a military land, in history, the Xiongnu, Tubo, Yueshi and other countries have ruled Loulan. Loulan is the Silk Road must pass through, the Han, Xiongnu and other nomadic countries, often provoked wars on the territory of Loulan, we can see in many cemeteries around Loulan City, we can clearly see that in the same area and the same period of cemeteries buried different races. So I think there were frequent wars at that time, and it was these endless wars that destroyed Loulan City. And Loulan is just a small and weak country, naturally not the opponent of these strong countries, so the kingdom of Loulan began to gradually weaken in the endless wars, and finally the northern power invaded, Loulan finally broke the city, it is possible that after Loulan was occupied, the occupiers carried out a massacre, and then evacuated, so Loulan was slowly annihilated by the wind and sand, and then abandoned, disappeared in the dust of history, and was forgotten by everyone. ”

Xiao Fei thought about it and gushed endlessly, and began to say in a beaming voice: "I think Loulan has been defeated by drought and water shortage, the ecology has deteriorated, and the upstream river has been intercepted and diverted, and people have to leave Loulan. Of course, speaking of this, we have to mention the background of global climate drought. I also read in a magical ancient book that about 10,000 years ago, the earth's environment underwent unprecedented changes, that is, from the dry and cold environment of the last glacial period to the humid environment of the post-glacial period, and on this opportunity, human culture also entered the Neolithic period from the Paleolithic Age. After 10,000 years, the geological environment has undergone three major stage changes, about 10,000 to 8,000 years ago for the warming period, about 8,000 to 3,000 years ago for the high temperature period (climate suitable period), and 3,000 years ago for the cooling period. These three environmental patterns have been confirmed by the study of geology, biology, chemistry and physics, but there are slight differences in the timing of the three phases due to different methods, locations or research objects. This change in the environment and climate has shaped the scope and mode of human activities. Taking Loulan as an example, the Neolithic Age human beings set foot here, the Bronze Age was prosperous here, and it was during the high temperature period, the Lop Nur Lake was vast and the environment was suitable. However, after entering the cooling zone, the water and soil environment deteriorated, the river water decreased, the lake shrank, and the desert expanded. Drought intensified around 2000 years ago, which was manifested in the occurrence of ice ingress in vast areas of northern China, the accumulation of loess, the extinction of lakes and marshes, and the retreat of the sea.

The ancient city of Loulan fell from about the second to the fourth century BC (from the Han Dynasty in the Central Plains to the Northern Wei Dynasty), which was a period of increasing drought. In fact, in this process of drought, not only the ancient city of Loulan disappeared, but also due to the expansion of the desert, the extinction of Niya, Karadun, Milan City, Niyang City, Khan City, Tongwan City and so on occurred successively. The demise of the ancient city of Loulan occurred in the context of the drought of northern China and even the world's climate, it is not an isolated space, but because Loulan is located in the arid interior, the changes in the human and natural environment here are more significant.

In addition to global climate change, the uplift of the Tibetan Plateau is the most important cause of regionality. Between 7 and 80,000 years ago, the Tibetan Plateau was uplifted rapidly. This uplift is decisive for the climate of northwestern China. Due to the geographical location of Lop Nur in the northwest inland of East Asia, warm and humid air currents from the Pacific and Indian Oceans rarely reach Lop Nur every year.

When the global climate changes, the entire western part of East Asia begins to see a trend of drought, desertification, and Gobiization. During this period, Lop Nur began to move from south to north. Around 70,000 years ago, the level of the lake dropped dramatically to the point where it finally approached the bottom. Due to the uneven topography of the lake bottom, the originally huge and unified ancient Lop Nur was decomposed into the current Taitema Lake, Kara and Shun Lake and the larger Lop Nur in the north. Among the regional factors, there was a major landslide event in the upper reaches of the Peacock River. The landslide completely blocked the channel of the Peacock River, cutting off the water supply to Lop Nur, although it remains to be studied whether it occurred before Lop Nur dried up.

In addition, Loulan has promulgated the world's earliest environmental protection law discovered so far, which can be described as a precedent for the era, which is really indispensable, and we don't seem to have any relevant laws now. Therefore, the migration of the river cut off the water source of Loulan, so that the residents had no water to drink, so they had no choice but to abandon the city and flee, and the ancient Loulan country gradually became desolate and disappeared in history, and the Russian explorer Przeval's Lop Nur wandering theory has attracted the attention of the world. He said that because the Tarim River, the Peacock River and other rivers converge at the mouth of the Lop Nur River, resulting in a large amount of sediment accumulation, the river channel is gradually silted up, coupled with the factors of crustal activity, so that the river naturally finds a new low and good place, and converges into new rivers and lakes, and the original Lop Nur gradually evaporates into a desert due to the lack of new water supply, coupled with the evaporation much higher than the rainfall. And we can get a glimpse of the leopard from the various documents found in these Loulan countries, the water source of Loulan is indeed becoming more and more scarce, there is not much left, some documents record the text calling on everyone to save water, the shortage of water will inevitably lead to the decline of agricultural productivity, food shortage, and will also force people who have lived here for a long time to find a new home. “

Xiao Fei said freely for a long time, I see that the things I searched for in Baidu data are similar, so there is no difference, it seems that he is secretly looking at the mobile phone, while talking endlessly to the people of us who do not listen.