Geography analyzes the climate based on tree rings

Thick tree rings indicate that the climate is suitable during the growing season, and thin indicates that the climate is not suitable.

The tree's growth rings are one circle per year. If the wind and rain are good and the growth of the trees is normal, the thickness of the growth rings is uniform; If there is a lot of rain and the trees are growing vigorously, the growth rings will appear to be extraordinarily thick; If the weather is dry during the year, the growth of trees will be slow, and the growth rings will appear weaker.

Tree rings are innate, and it is impossible for anyone to change them. Based on this law of tree growth, scientists can calculate the climate change information of a region from 10 years to 100 years.

Well, it must be for the old tree to be able to save the age, that only the annual rings of the well, the thickness is not the same on the theory of well, all aspects are different um, because we can't say the good, but the experts who specialize in the study of the tree can tell, his annual rings are a circle, how much there is a cannon, every year by the disaster answer to the harm, well, he can record the tree's rings, too much to understand, but I know that it is recorded on the top is true.

The growth rings of the old tree are very clear, the rain is abundant, the wind and rain are smooth, its growth rings are thicker and wider, and the growth rings are relatively thin and narrow in drought and disaster years.

This is biological knowledge, an accumulation of experience and theoretical knowledge.

Can you see from the annual rings of Jian Dashu that the message of the day before the dawn is respectful?

Scientists study the growth rings of trees 3,500 years ago, which reveal global climate change.

Warm and wet - cold dry - warm and wet.

Falling sea levels.

Causes: Plant growth, fast growth in warm and humid environment, large plant cells, large interstitial spaces, loose and sparse wood; In cold-dry climates, plants grow slowly and have smaller cells, so the rings are dense.

As a result, the dense rings reflect a cold climate, low glacier melt, and a drop in sea level.

Latitude decreases from low latitude to high latitude.

Land and sea distribution At the same latitude, the land temperature is high in summer and the ocean temperature is low. In winter, land temperatures are low and ocean temperatures are high.

Topography Same latitude The higher the altitude, the lower the temperature.

The north side of the tree's growth rings is denser?

b. Question analysis: The growth of trees is directly affected by the factors of temperature and precipitation, and trees grow fast in the warm period and slow in the cold period. As can be seen from the tree rings in the diagram, the central and outer trees are growing vigorously, reflecting the change of climate from warm to cold to warm.

Comments: This question is not very difficult, and the change of temperature can be directly reflected from the sparse change of tree age shown in the figure. Pay attention to the relationship between temperature and sparse growth rings: dense growth rings reflect fast growth and warm climate.