The invention provides a bamboo
bonsai soil water retention
composite structure and a construction method thereof, and relates to the technical field of gardening cultivation, a gradient ceramsite drainage layer and a coarse ceramsite bottom layer are high in
porosity and rapid in drainage, a fine ceramsite upper layer
nano silicon dioxide
coating reduces the drainage speed, a gradient drainage channel is formed, and the drainage-
water retention contradiction is solved; dynamic
water balance is realized. The three-dimensional composite non-
woven fabric interlayer and the two modified non-
woven fabric sandwiched
water retention-ventilation functional layer prevent ceramsite from being mixed with upper soil, and the effect of assisting
water retention and ventilation is achieved. Ceramsite-
biochar composite particles of the
microorganism-mineral improvement layer are inoculated with a
phosphate-solubilizing and
potassium-solubilizing
microbial agent, so that nutrients are adsorbed and converted, and
nutrient loss is reduced. The breathable and water-retaining planting layer is formed by mixing
leaf mold,
perlite and bamboo fibers, microbial
fermentation organic fertilizer is added, the breathable and water-retaining planting layer is loose and breathable, nutrients are provided for
root system growth, the
root system microenvironment is optimized, healthy growth of the
root system is assisted, and cooperative regulation and control of dynamic
moisture balance and healthy growth of the root
system are achieved.