Cicadas sing less and less. What happened this summer?

Catching cicadas as a child is like catching them all summer. Deep in the shade is the world of cicadas, and the song "cicada, cicada" is a unique music in midsummer. When I grow up, I don't know if life is too hasty or if I have lost my childlike innocence. The cicada song has begun to fade out of my memory, and the occasional cicada song in the distance can't arouse ripples in my heart. What calls me to welcome the arrival of summer is no longer a clear and loud cicada, but a wave of heat waves coming from the road.

But now the cicada calls up memories of my childhood. Some time ago, my mother was ill, and after treatment, she was transferred to a quiet big hospital, where there are many trees and a good environment, which is very suitable for postoperative recovery, so I go to the hospital to visit my mother every Sunday. On this day, I took fruit and food as usual and went to the hospital where my mother lived by car. The weather was fine and I was relaxed all the way.

Not far from the hospital, I got off the bus and wanted to go directly to my mother's ward, but several clear and loud calls attracted me. It's like the call from the banyan tree by the pond when I was a child, calling for summer one after another, and suddenly bringing me into the world where the sky is blue, the breeze is like a Buddha's face, the trees are dancing and the flowers are in full bloom. The sound of nature is so harmonious and beautiful.

By the time I came to my senses, almost everyone had left. I looked at my mobile phone. I still had time, so I continued to look at the cicadas in the trees, listen to their moving songs and feel the breath of summer. I haven't calmed down so much for a long time, so close to nature. When you think about it, when you grow up, life is too hasty and the surrounding environment has changed a lot. I missed many beautiful things in nature, including the sound of cicadas. Because in recent years, it has been rarely heard in both urban and rural areas, and cicadas are becoming less and less.

First, eat. Food is the most important thing for people. China people are fastidious and like eating, so cicadas can't escape from China people. In the past, under the condition of insufficient original ecology and social productivity, people's capture of cicadas was not enough to offset the reproductive speed of cicadas. However, with the people living and working in peace and contentment and a large population, the consumption of cicadas is increasing. It usually takes 3-7 years for a cicada to grow into an adult, and the longest cicada even sleeps underground for 17 years. What we eat in one gulp is hard-working life, and most of them have not even propagated, so the number of cicadas will inevitably be greatly suppressed.

Second, seal. The growth process of cicadas begins with eggs. Every year from June to August, when the fertilized female cicada reaches the spawning stage, she will use a pointed ovipositor to tie a small hole in the twig of the tree and lay her eggs in the wood of the tree. Then, after about 15-30 days of development, the larvae hatch out, or are blown to the ground by wind and rain or withered with branches due to skin shedding, and then the larvae will drill into the ground and suck the roots.

However, in recent years, on the one hand, due to the overuse of pesticides and fertilizers, the soil structure has changed, which has hardened the soil, and it is known that larvae have no moist and beneficial soil to drill; On the other hand, with the acceleration of urbanization, hardened land is everywhere, and larvae can't get into the soil at all, or even if they finally break through the ground after 81 difficulties, they are blocked by cement. So cicadas will naturally decrease accordingly.

Third, destruction. Although the disappearance of vegetation will not affect human life in the short term, it is fatal and even extinct for many animals. Cicada is greatly influenced by vegetation. When a large number of vegetation is cut down, cicada larvae lose the sap of the roots of the plants on which they depend, and naturally cannot survive. Moreover, in today's frequent housing construction, land damage is very serious. Perhaps today it is still a peaceful and beautiful mountain, and tomorrow it will be excavated with the rise of buildings. In this process, I don't know how many growing larvae were buried.

Fourth, tolerance. Although there are fewer and fewer cicadas, especially in cities and some places with serious environmental damage, it is basically difficult to hear the sound of cicadas, but even so, many people are still very concerned about the occasional cicada, and feel that the cicada's voice is harsh and not tolerant enough. So this is also a reason for the decrease of cicadas. When people think that the sound from nature is noise and want to eliminate it, cicadas are farther away from people's lives.

Cicada is a favorite image of creators and a unique symbol of summer. In ancient times, there was a quiet artistic conception of "the bright moon surprises the magpie, and the breeze chirps at midnight". Today, there is a lively scene of "cicadas calling for summer on banyan trees by the pond". Knowing that it gives summer a chance also makes the city less dead and cold.

There are fewer and fewer cicadas in summer now, and they can hardly be heard, which is mainly related to human beings. People's consumption of them, the drastic changes in the living environment caused by human beings, and human tolerance for them all make this little guy who has been dormant in the dark underground environment for three years and only sings for 20 days in summer less and less. Maybe one day, later generations will never understand the artistic conception in Bai Juyi's ancient poems. "On the seventh day of June, cicadas on the river began to sing. In the deep leaves of heather, there are two or three sounds at dusk. "