Why are tumbleweeds defined as invasive in the United States, and why are they not proliferating in

Because this grass has been effectively controlled in our country, and there is no suitable environment for tumbleweeds to live in our country, it has not been flooded in our country.

Because our country has controlled the growth of this plant very well and has not caused serious effects on the environment and air, it is important to protect the living things.

Because China's protective measures are very good, and China's ecological environment is also very good, tumbleweed has not been flooded in China.

Tumbleweed are herbaceous, semi-shrub plants that often produce dense and prickly branches, and their fruits are spherical cyclides attached to vigorous branches. When the tumbleweed matures, it is a round ball that rolls around on the ground as soon as the wind blows. When they bounce, they leave seeds on their way, and some pests hitchhike on tumbleweeds and go to different places.

For such plant characteristics, in a place like the Great Plains in the United States, tumbleweeds become a paradise for them once a seed lands there. <>

Most of the places where tumbleweeds have invaded have been eroded. They act like a pump that sucks up scarce water, and many local plants die from lack of water. Then, when it starts its long journey, it destroys the topsoil as it rolls, further destroying the living space of other plants.

Not only that, tumbleweeds also like to pile up on the road, in front of the house, and often find that after waking up, the tumbleweed has buried its home. In addition to clogging gates and roads, tumbleweeds can damage power lines and farmland, as is the case with the 5,260 square kilometers of farmland now abandoned in Arizona. <>

But such a tumbleweed, which is rampant and domineering in North America, is difficult to survive in our country. Tumbleweeds are hard to grow in our country, let alone float around. In desert areas, there are a lot of wild camels and donkeys, and their diet consists of tumbleweeds, so before tumbleweeds grow, they are eaten by these animals.

In addition, tumbleweed is a genus of pigweed, which can be used as traditional Chinese medicine, and many people will eat the sprouts of tumbleweed as wild vegetables. <>

Tumbleweed is one of the food for camels**, which shows that tumbleweed in our country has almost no chance to dance freely. In fact, even if tumbleweed has a chance to grow, it doesn't leave little trace on our terrain. After all, in the Midwest, the mountains and rivers are crisscrossed, and tumbleweeds have to cross mountains and rivers, and even the northwest wind can hardly carry them anywhere.

Because the environment in our country is not very suitable for the growth of tumbleweeds, and we have the means to control tumbleweeds, it is difficult for them to appear in our country.

Mainly because of the environment, the area of China's mountainous areas is relatively large, and if the plant is floating in the mountainous area, it is very likely that the bridge limb will be hindered by the mountain peaks and the influence of the wind direction, resulting in the division of labor grass is difficult to spread in a large range, thus limiting the growth range of this plant.

Tumbleweed, refers to the plant that can roll with the wind after drying, and most of the plants that form tumbleweed are Russian spiny saphorns, which are an annual herbaceous plant that grows up to one meter long, with coarse bristles and milky small bumps next to the kaisui, and there are small thorns at the tip. The vitality of the sedan chair and the stress of the sedan chair are very strong, and they can be seen in the Gobi, sandy beaches, deserts or cultivated fields, and they are very easy to feed.

Running around in the United States, running to the overflowing tumbleweeds, why can't they run in China?

Because the environment in our country is not suitable for the growth of tumbleweeds, tumbleweeds basically do not grow in our country. The best place to grow tumbleweeds is the United States.

Tumbleweed, also known as spiny sand phorn, is a semi-arid grassland and desert-shaped vegetation. Tumbleweeds thrive when water is abundant, and in dry seasons, they break free from their roots and flutter with the wind. The desert of our country has been rainless for a long time, which is not suitable for the growth of this plant.

Because the environment in the United States is very suitable for the growth of tumbleweeds, which are not very adapted to the environment of our country, it is difficult to grow in our country.