Resource Allocation Strategy and Soil Driving Factors of Vegetation Concrete Restoration System Under Co-Operating Environment

Abstract

The ecological function optimization strategy of vegetation directly affects the self-stability and engineering sustainability of the vegetation concrete ecological restoration system, which is the key to the successful restoration of an ecosystem. To clarify the survival strategies of slope protection plants and their response mechanisms to the soil environment in the process of vegetation concrete ecological restoration, the resource allocation strategies and soil driving factors of typical slope protection plants, such as Cynodon dactylon (Linn.) Pers. and Indigofera amblyantha, in a co-operation environment mode, were investigated by controlled simulation experiments. The results showed that (1) the co-operating environmental model had a significant effect on the biomass (leaf, stem and root) and root shoot ratio of slope protection vegetation; (2) the sensitivity of plant biomass in the co-operating environmental model was leaf biomass ratio > root biomass ratio > stem biomass ratio, and the most sensitive organ was the leaf; (3) a common allometric growth index for the plants of all slopes existed, the root and leaf grew at the same rate, and the plant roots and stems showed allometric growth with the synergistic effect of rainfall and slope; (4) the total nitrogen content of soil had a significant correlation with the vegetation R/S (root shoot ratio) (p < 0.05) due to the synergistic effect of vegetation type and slope, while the total phosphorus content of the P3 slope had a significant negative correlation with the vegetation R/S (p < 0.05). The co-operating environmental model significantly affected the spatial distribution of vegetation biomass and had the greatest impact on leaf biomass. The contents of soil nitrogen and phosphorus were the key soil driving factors that affected the distribution pattern of plant biomass. The resource allocation characteristics of different vegetation and its response to soil factors had species specificity.

Keywords

• disturbed slope, vegetation concrete, ecological restoration, biomass, soil factor