The next morning.

"Xiaobai, go!"

Xu Ming got on a four-wheel drive off-road vehicle, followed Xiaobai behind him, waved his hand and embarked on a journey northward.

First of all, what was to cross was a coniferous forest with a depth of more than ten kilometers. It could only be passed by walking, which took him more than an hour.

Arrived at the mountainside of the northern mountains.

Xu Ming estimated that the altitude was about 500 meters.

The vision in front of me suddenly became clear and I entered the grassland area.

Why do areas with higher altitude and colder temperatures grow less tall trees, but mostly low grass plants?

This is mainly related to temperature, light and water.

Generally, the higher the altitude, the lower the temperature. Once a freezing disaster occurs, the ice ridges on the branches will crush the trees. It is not uncommon to freeze tens of thousands of acres of trees overnight, but grasses rely on their root systems to survive. Even if the ice and snow are two or three meters thick, the temperature will rise the following year and can continue to germinate.

The second is light. The light in high-altitude areas is very strong and has a huge transpiration effect. However, the soil at high places is difficult to store water. Once there is no rainfall for a long time, trees are prone to drought and grass evaporation will be much smaller, so they can survive without much rainfall.

In addition, the grassland is strong. In order to resist strong winds, many grasses grow together in clusters. If trees cannot form large areas of forests, they cannot withstand the destruction of strong winds.

However, the grassland that Xu Ming stepped on was evenly distributed and continuous, with greenness and greenness like a carpet, which was pleasing to the eye.

When I lowered my head and observed, the green grass under my feet was all bile-leafed, with heart-shaped leaves and thicker, like bean seedlings.

Xu Ming called it "two-leaf clover".

Then he took out the motorcycle, twisted the accelerator, and galloped quickly on the Twin Leaf Prairie.

The 15-centimeter-wide muscle tire made the motorcycle run very smoothly, but the two-leaf clovers under the wheels were in trouble. For a moment, many innocent two-leaf clovers were affected and were driven into the soil, leaving a conspicuous driving trace.

The long-eared rabbit Xiaobai followed behind and swept past like a gust of wind, and more of the two-leaf clovers were suffering.

Considering the recovery speed of the ecology here, it is unknown how long it will take for those places that have been destroyed to recover.

Of course, Xu Ming didn't think that was a big problem, and he didn't think he had such great destructive power.

Moreover, sometimes destruction is not necessarily a bad thing.

Like Blue Star, it has experienced five mass extinctions in a total of 2 billion years since the birth of eukaryotes.

Some are caused by volcanic eruptions, some are caused by climate change, and some are caused by impacts from outside asteroids.

Each time a biological extinction occurs, at least more than 70% of biological species will be extinct.

But in several cruel elimination competitions, animals appeared, including millions of insects, rich and diverse plants, fungi, viruses and other microorganisms, all over the soil, water sources and even volcanoes, 10,000 meters deep sea, etc.

Blue Star has become a planet with tens of millions of creatures.

What about the world of your own?

How many extinctions have been experienced here?

Xu Ming didn't know, but from the phenomenon of seeing only plants but not animals, we can tell that the planet under his feet should have not experienced any mass extinction.

In addition, the day and night are equally long, and the year is like spring. On average, there is a more severe weather change every five hundred years.

This planet will probably remain intact for a long time, and it can be said to be as stable as an old dog.

Xu Ming didn't know if others liked this unchanging environment, but he personally said that he was very adaptable and liked it very much.

Continue north.

It took only half a day to travel at least hundreds of kilometers.

Because mountain roads are difficult to walk, they cannot walk straight, so they can only walk around in a curve and take a flat road that is easy to walk on. The actual distance is only about fifty kilometers.

According to the data on the air pressure gauge, the altitude here has reached about 2,000 meters.

At this altitude, the atmospheric pressure is only 75% of the plain and the oxygen content is only about 80% of the normal, which can have a certain effect on the human body and make it easier to get tired, etc.

Fortunately, with Xu Ming's physical fitness, this has not had a big impact on him.

However, because the terrain is more rugged and the road is narrower, and it is full of gravel, off-road vehicles, motorcycles, scooters and other means of transportation cannot be used. Xiaobai instead uses the most. He can only use Xiaobai with a rope and order it to move forward to the left and right.

In addition, Xu Ming noticed a phenomenon that at an altitude of 2,000 meters, you can see a small amount of grass vegetation downwards. Further upwards, even grass disappears, and there is only a barren state of no grass.

Why is this the case?

Xu Ming, based on his own senses, the temperature in the two thousand meters above the world is still above 10 degrees, water resources are not scarce, and there is sufficient light. Why can't even grow grass?

There are not even bryophytes.

If it is placed on the Blue Star, this environment will still be a paradise for plants.

"It's still a question of carbon dioxide concentration!"

"This altitude, carbon dioxide concentration is diluted to the point where the plants cannot grow at all, and the synthetic nutrients cannot withstand consumption, so it has become a forbidden area for plants, with only one wasteland."

I climbed up this mountain with some difficulty.

Xu Ming took a break for a while.

Then I opened the vortex of time and space, went back to the villa to make lunch, and made a simple meal with two dishes and one soup, plus a golden durian bag... During the exploration, I lived a little hard life.

Xiaobai enjoyed half a pot of pearl rice, a handful of red dates, two carrots, and two golden durian bags... Because it has worked hard, the food can be said to be a lot better.

afternoon.

Keep going.

In order to reduce the detour, Xu Ming spent more than four hours directly crossing the two towering mountains in front of him that seemed ordinary but were actually nearly three thousand meters above sea level, which made him very tired.

Xiaobai was almost exhausted. During the process of climbing the mountain, it replenished six golden durian bags to ensure sufficient energy supply.

But these hard work is totally worth it.

During the process of cutting down giant fir trees, the "golden mountain" that had taken root in his heart with a telescope on the top of the tree was now ahead of him.

Just cross the river in the valley below.

Under the red sunset that was about to set, the "golden mountain" was even more golden, as if it was added with special effects, which was very eye-catching.

But then Xu Ming's attention was attracted by another landscape.

Light.

Silver-white, with stars and dense light.

Especially after the stars set.

In the valley, on the flat areas on both sides of the river, a large area of ​​self-luminous herbs grew, like the ground after the rain in anime, with a lot of diamonds scattered by people, and crystal light shining everywhere.

Xu Ming was a little stunned.

I couldn't help but take out my phone and took pictures of this "Gather of Light".
Chapter completed!