Microclimate Effect And Simulation Of Plant Community Reconstruction In Mining Area

Because the plant community reconstruction in the mining area is disturbed and restored by human beings,the surface water and heat characteristics change,and the surface radiation balance and energy exchange process are very different from other regions,thus forming a unique microclimate.Therefore,it is necessary to study the microclimate of plant community reconstruction in mining area.In this paper,the temperature and relative humidity at 1.5 m of the surface of six reconstructed plant communities of Caragana korshinskii,Hippophae rhamnoides,Salix psammophila,poplar Caragana korshinskii,poplar Artemisia ordosica and Artemisia ordosica in Daliuta mining area were monitored continuously for 48 hours in summer,the temperature and relative humidity at 10 m,20 m,30 m,40 m and 50 m above the reconstructed plant communities of poplar,Artemisia ordosica,Salix psammophila,Artemisia ordosica and poplar were measured by temperature and humidity sensor device carried by UAV,the microclimate characteristics and differences of different reconstructed plant communities were statistically analyzed,and the dominant factors affecting the microclimate of reconstructed plant communities were determined.On this basis,typical Caragana korshinskii community and poplar Artemisia ordosica community were selected,Envi-met model was used to simulate the microclimate effects of vegetation allocation under different site conditions,and the differences of microclimate effects between Caragana korshinskii community and poplar Artemisia ordosica community were compared.The results show that:The microclimate effect at 1.5 m of the land surface is as follows:(1)The results showed that the temperature of the six reconstructed plant communities increased first,then decreased,and then increased in a single peak during the day and night,and the relative humidity curve was opposite to the temperature.(2)Caragana korshinskii community had significant effect of low temperature and high humidity.In daytime,the average temperature of Caragana korshinskii community was the lowest(31.62 ?),while the average relative humidity was the highest(56.81%);At night,the average temperature of Caragana korshinskii community decreased to 19.63 ?,and its relative humidity was still the highest(93.14%).(3)The dominant factor of temperature difference of plant community in daytime is site condition,while that in night is vegetation feature.The main factors of the difference of relative humidity in daytime plant community are vegetation characteristics and site conditions at night.The microclimate effect in the range of 10?50 m of land surface:(1)Comparing the temperature and humidity of the four reconstructed plant communities in the horizontal direction: there was significant difference in the temperature and humidity of the four reconstructed plant communities at 10 m from the surface(p < 0.05).The temperature of poplar Artemisia ordosica combination was lower than that of a single shrub or tree community,while the humidity was higher than that of a single shrub or tree community.(2)Comparing the vertical change rate of temperature and humidity of four reconstructed plant communities: the vertical decrease rate of temperature of poplar Artemisia ordosica tree irrigation combination was smaller,while the vertical increase rate of relative humidity was the largest.(3)Canopy height,canopy coverage,leaf height diversity and planting area index had significant effects on the temperature and humidity at 10 m from the land surface,and the effect of canopy height was the largest.Microclimate effects of vegetation allocation under different site conditions were as follows:(1)For Caragana korshinskii community,from the perspective of cost saving and improving microclimate effect,the area ratio of Caragana korshinskii to grass is recommended to be 1:4 under the condition of sunny slope with large elevation and gentle slope,and 1:5 under the condition of sunny slope with large elevation and gentle slope and shady slope with large elevation and flat site.(2)For the poplar Artemisia ordosica community,from the point of view of cost saving and improving microclimate effect,the area ratio of poplar to Artemisia ordosica is recommended to be 14:5 under the conditions of large elevation gentle slope on sunny slope,large elevation gentle slope on shady slope and large elevation flat site on shady slope,and the area ratio of poplar to Artemisia ordosica is recommended to be 6:13 under the conditions of large elevation flat site on sunny slope.The paper has 29 pictures,14 tables,and 120 references.