Abstract: A method for estimating the organic carbon content of wetland soil with different restoration years, which relates to the technical field of carbon sink accounting. The method includes: setting a plurality of sampling points in a target research area, and collecting soil samples; preprocessing satellite image data and determining first input features, determining second input features according to geographic coordinates of the sampling points, and inputting the features into a regression prediction model to obtain a calculation result; generating soil organic matter content data distribution according to the calculation result; and dividing sample areas with different restoration years according to land use history or restoration measure records by using space-for-time substitution, and counting the soil organic matter content and total amount in each sample area according to the soil organic matter content data distribution to determine the organic carbon content of soil with different restoration years.

Abstract: A method for near-natural long-term breeding of economic crops in a wetland by using a returned farmland is provided, including the following steps: S1, selecting site of the returned farmland and restoring landform; S2, performing germplasm improvement treatment of Euryale ferox; S3, controlling sowing of the Euryale ferox seeds; and S4, germplasm improvement and ecological conservation.

Abstract: A method for rapid reconstruction of a food source habitat of Leucogeranus leucogeranus by using a returned farmland is provided, including following steps: S1, selecting degraded farmland plots; S2, constructing a connected plot network; S3, improving local soil habitat elements; S4, coating water chestnut bulbs; S5, cultivating the water chestnut bulbs; and S6, regulating and controlling and managing a hydrological environment.