Method for activating soil seed bank in large area of arid desert area

Abstract

The invention relates to a method for activating a soil seed bank in a large area of an arid desert area. The method provided by the invention utilizes a substance base which is contained in the soil seed bank, is used for restoring and recovering vegetation and has the property of accelerating the vegetation of a degenerated ecosystem to rapidly recover the potential; on the basis of abiding by a reproduction principle of plants in the arid desert area, artificial pilot and overflowing are respectively carried out at a rain distributing period of seeds of main dominant species and in a germination season of multiple seeds in the soil seed bank through utilizing limited water resources including brackish water of a recovering area, ecological water drained from a flood season and the like; and a seed source is artificially supplemented through combining a step of rinsing seeds, so that the large-area activation of the soil seed bank is realized; a vegetation community of the degenerated ecosystem of the arid desert area is recovered and restored, so that an ecological recovery process of the degenerated ecosystem is accelerated and a positive succession of a plant community structure and a species diversity is realized.

Description

technical field [0001] The invention relates to a technology for restoration and reconstruction of vegetation in degraded ecosystems in arid desert areas, in particular to a method for activating soil seed banks in large areas during the vegetation restoration process in degraded ecosystems in arid desert areas. Background technique [0002] The arid and semi-arid deserts and desertified land in Northwest my country cover an area of ​​nearly 1.5 million square kilometers, accounting for 15% of the country's land area. my country has become one of the most serious countries in the world suffering from desertification. Almost all desertifications begin with the degradation of vegetation communities, eventually evolve into the degradation of the entire desert ecosystem, and then reversely lead to the desertification of the entire region. Most of my country's arid and semi-arid desert areas are located in the hinterland of the continent, which is a typical continental arid clim...

AI Technical Summary

Problems solved by technology

Most plants in arid regions adopt the "r strategy" under harsh natural environmental conditions. The seeds of these species lose their vitality in a short period of time after the seed rain disperses. It will be difficult to germinate, resulting in weak renewal of the entire population; and some persistent soil seed banks are often due to the extremely dry surface soil in arid desert areas rich in soil seed banks, and the original seasonal surface water overflow process is changed and other factors The normal germination cannot be achieved due to the impact of the degraded ecosystem, resulting in the difficulty of regeneration and reproduction of all populations in the entire degraded ecosystem.

However, in some areas where the vegetation community is extremely degraded, the relatively long period of continuous vegetation decline and continuous decline in species diversity, coupled with artificial random digging and overgrazing, have led to a significant decline in the storage capacity of the soil seed bank and the renewal of the entire community. Restoration lacks a corresponding natural material base