From the results of the experiment 1, it can be seen that there is little difference between the sound level values measured on the lawn and the concrete floor in the campus, which are all below 40 decibels, while on the road outside the school, it is 50.7 decibels, and at the school gate, it is 42.7 decibels. There is little difference between the sound level values of campus lawn and cement floor, because the leaves of grass are close to the ground, which does not hinder the sound transmission too much, so the sound absorption effect of small lawn is not great. The reason for the great difference in sound level values inside and outside the school is the different road distances. The green belt and teaching building formed by tall trees and lawns in the school have obvious noise absorption and blocking effects.

2. Analysis of adsorption of campus lawn on airborne particles.

According to the results of Experiment 2, the average weight of total suspended particles on campus lawn is 0. 19, and that on cement floor is 0.76. When students go to school, the lawn is 0.22, cement 1. 13. This shows that the lawn has obvious adsorption effect on suspended particles in the air, whether at ordinary times or when students are active frequently. The reason is that most lawn grasses in our school belong to Gramineae and Cyperaceae, and their leaves have a large amount of contact with air, which has a good dust retention effect.

3. Analysis of the influence of campus lawn on air temperature and humidity.

Experiment 3 shows that the daily temperature difference of lawn is smaller than that of cement floor, and the relative humidity is usually higher than that of cement floor. This is because the lawn absorbs more solar radiation, but less reverse radiation to the atmosphere. The leaves of lawn grass can take away heat and increase humidity through transpiration.

4. Analysis of the influence of campus lawn on campus biodiversity

From the collected specimens, it is found that carpet grass and Bermuda grass are planted in the football field, which are ideal sports lawns because of their deep and tough roots and criss-crossing underground. The rest of the campus is grass in Taiwan Province Province, which belongs to rest and ornamental lawn. A large number of insects in the campus lawn attract many birds to inhabit the campus, and form a food web with earthworms, insects and microorganisms in the lawn, which adds a lot of vitality to the campus and plays a positive role in protecting the biodiversity of the campus.