| In recent years,with the rapid development of national infrastructure and livelihood projects,a large number of exposed rock slopes have appeared,so it is urgent to cover with green and improve the environment.With the aim of green covering on bare rock slope,this paper probes into the covering technology through the investigation and analysis of the problem of bare rock slope,the development and test of"green covering mechanism",and obtains some understanding and achievements.?1?A set of"green covering mechanism"based on the characteristics of bare rock slope is developed,which can simulate the rock crack through the splitting state between keel grooves,and also simulate the sag state of uneven rock surface in practical engineering.The width and depth of rock crevice were simulated by changing the number of keel grooves and overburden thickness.The lifting and supporting steel tubes are provided with different slope angles.Supplementary light lamp and drip irrigation equipment to meet the needs of plant growth.In the future,the green covering of rock slope can simulate the actual engineering characteristics,and the green covering mechanism of rock slope can be used to carry out indoor feasibility study,and relevant parameters can be configured according to the actual demand,so as to reduce the uncertainty and error rate of actual green covering.?2?Plant growth law under the characteristics of rock slope was obtained by experiment:?1?Seedling emergence time:There was a positive correlation between the amount of water and the emergence time.Light and basal fertilizer had no significant influence on the emergence time.The earliest emergence was under the condition of high water supply and high slope.The seedling emergence time was covered with green mechanism C>B>A regardless of illumination.?2?Germination rate:Substrate and slope had no significant difference in germination rate?P>0.05?,water amount significantly affected the germination rate of seeds?P<0.05?,and the germination rate of the supplementary light group was1.36%?1.61%higher than that of the natural light group.?3?Plant height:Under different soil substrates,there were H1-3>H5-7-7 and H2-4>H6-8-8 covered with green mechanism A—D.The difference of plants was positively correlated with slope,and the effect of basal fertilizer on longitudinal growth was determined by slope,followed by light.The slope was negatively correlated with the rate of plant height decline,and the plant height at extreme growth was22.1%?280.6%different in the growth process.The plant height dynamics could be fitted by quadratic function model,and the correlation coefficient was R>0.83,which could basically master the plant height dynamics under the characteristics of rock slope.?4?Tiller number:The plant tiller was slow in the early stage,exponential growth in the middle stage and slow in the later stage.The tiller number was the highest in the controlled-release basal fertilizer group,and soil conditions had the most influence on tiller number.The number of tillers in the light group was the highest,and the water supply could not determine the number of tillers in the root.Under extreme growth,the tillering number varied from 48.2%to 125%in the growth process,and the tiller dynamics could be fitted by boltzmann curve with correlation coefficient R>0.91,which could be used as the dynamic tillering model of plants under the characteristics of rock slope.?3?Explore the green covering technology of bare rock slope under the theoretical guidance of"geo-environmental reconstruction method".On the basis of the actual habitat characteristics of exposed rock slope and the ecological geology theory,a scheme combining the rock slope,plants and experimental formula was successfully constructed.As a tentative exploration,the emerging geodetic reconstruction method is applied to the green covering of bare rock slope. |
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