Conclusions
Along with time going by, plant growth, the plant-resources relation should be considered. In a growing season, as plant grows, plant growth goes into the fast growth stage, the leaves were totally expansion and the plant-resources relation may goes into the critical period of plant- resources relationship regulation If the available resources are lower than resource use limit by plants (Guo 2021a and 2021b). Plant was very sensitive to resources storage in this period. If the duration of resource scarcity is more than the critical period of plant- resources relationship regulation or plant density is more than soil water carrying capacity, showing that resource shortage is serious and serious influence soil and water conservation vegetation restoration and the plant-resources relation must be regulated by cutting some trees and reduce plant density in this stage based on vegetation carry capacity to realize high-quality and sustainable development of soil and water conservation vegetation.
In view of the important of the potential of soil and water conservation vegetation restoration in the process of high-quality development and soil and water conservation vegetation restoration is close related with vegetation carrying capacity and vegetation carrying capacity change with forest age because precipitation change with years (Guo 2014) and vegetation types and location, we should strengthen the studies of the plant-resources relationship and decide vegetation carrying capacity and the limit of forest vegetation restoration at different years in order to promote the high-quality sustainable management of soil and water conservation vegetation and get maximal soil and water conservation beneficial to match the People’s yearning for a better life and the need for soil and water conservation(Guo 2020,2021a and b).