The invention discloses a method for in-situ restoration of a
saline-alkali land
ecosystem in the Yellow
River delta by using triarrhena lutarioriparia and
biochar, and belongs to the technical fieldof
saline-alkali
land improvement. According to the addition of the
biochar, specifically, calculation is conducted according to the
soil pH, the
salt content and the soil property, the
soil pH of coastal salt-alkali land of the Yellow
River delta is 8.5, the
salt content is 0.75%, the soil is sandy clay
loam in property, the content of
organic matter is low, and the application amount of the
biochar is 2-4% of the weight of the soil. An application method comprises the steps that (1) the land is leveled; (2) the specific addition amount of the biochar is calculated according to the soil density and planting depth of an improvement site, the specific addition amount of the biochar is 2-4% of the weight of the soil, and a calculation method for the weight of the soil is that the weight of the soil is equal to a product of the surface area of the improvement site, the planting depth and the soil density; (3) a calculated amount of biochar is evenly laid on the surface of the soil, and soil turning and even mixing are conducted; (4) aging is conducted for three days after even mixing, and
miscanthus of triarrhena lutarioriparia can be planted. By means of the technical scheme, the in-situ restoration of the
saline-alkali land
ecosystem in a coastal area of the Yellow
River delta can be achieved, physiochemical characteristics and biocenosis structures of the soil of the restored saline-alkali land are greatly changed, and the restored saline-alkali land is suitable for the survival and
normal growth of
miscanthus.