The invention discloses multi-layer
response type ecological seed paper and a preparation method thereof. According to the invention, the microencapsulated seed adopts a
sodium alginate and
chitosan double-layer
coating process, and the pH response characteristic is combined, so that the problem of seed damage caused by high temperature or
mechanical pressure in the traditional seed paper
processing process is effectively solved. The
sodium alginate gel layer forms a
physical barrier through ionic crosslinking, so that direct
impact of a
processing environment on the seeds is isolated; the pH sensitivity of the
chitosan coating ensures that the seeds are only released under the soil neutral condition, and poison of acidic or alkaline environment to seedlings is avoided. When the
soil moisture content exceeds a threshold value, the hydrogel grid structure is rapidly expanded and disintegrated, and the slow-release
fertilizer and the
nitrogen-fixing
flora are synchronously released. According to the dual intelligent
response system, the
survival rate of the seeds is increased, accurate space-time matching of
nutrient release and seed
germination is achieved, and in a mine remediation scene, heavy
metal adsorption and soil microbial
community reconstruction can be completed at the same time by adjusting the aperture of the hydrogel and the variety of probiotics.