The invention discloses a fish habitat dividing method based on a hydrodynamic force condition. The fish habitat dividing method comprises the following steps of (1) determining a fish habitat dividing boundary range; (2) determining characteristic fish and hydrodynamic force characterization factors; (3) distinguishing fish habitats; (4) classifying the fish habitats; (5) classifying protection measures of the fish habitats; and (6) performing quantitative assessment on the protection of the fish habitats. Based on condition requirements of two types of hydrodynamic force characterization factors such as water current motion indexes, and water current energy indexes, and according to dividing principles that fish habitat protection ranges are partitioned, protection degree is graded, and protection contents are classified, repairing, dispatching and research and development work requirements of river fish habitats are planned and deployed at the source, the protection theory and the technical research system of the river fish habitats in China are filled and perfected, and the win-win of social benefits, economic benefits and environment benefits is realized.

Fish habitat dividing method based on hydrodynamic force condition

The invention discloses a quantification analysis method of fish habitat space characteristics influenced by gate dam regulation and control; the method comprises the following steps: investigating fish resource present situations in a research area, and screening a target fish; aiming at the screened target fish, and using indoor stress experiments and history data to build a quantification response relation curve of the target fish with respect to key habitat factors; gathering research area basic hydrology and landform data so as to build a water-power water environment model, and combiningthe quantification response relation curve of the target fish with respect to key habitat factor so as to build a habitat model facing fish habitats; introducing a landscape ecology theory and methodso as to evaluate the space characteristics of the habitat simulation result facing the fish habitat, and quantitatively analyzing the influences on the fish habitat space characteristics by the gatedam operations. The method can guide multi-gate dam river ecology restorations and protections, thus providing important theory and practice meanings for basin water resource planning and configurations.

Quantification analysis method of fish habitat space characteristic influenced by gate dam regulation and control

The invention provides a constructing method for a fish shelter under the stress of high silt concentration flood. The constructing method comprises the following steps that a suitable river reach is selected according to the water area fish resource state, a flood plain tidal wetland system is artificially constructed by adopting an ecological engineering measure, and the flood plain wetland hydrologic connectivity is improved so that the stress of the high silt concentration flood on fish can be avoided, specifically, A, the fish which needs protecting and the required habitat condition of the target fish are determined; B, the site of a shelter is selected; and C, the shelter is constructed. According to the fish shelter constructing method under the stress of the high silt concentration flood, a natural river bend on one side of a river bed and a wide river channel of a wetland can serve as construction areas under the condition that flood drainage is not affected; the continuity of the river channel is restored by excavating an overflow weir; the complexity and the hydrologic condition diversity of the river channel are improved; the shelter for sheltering the fish and other aquatic animals from the high silt concentration flood is provided; conservation of the species of the aquatic animals in a river is facilitated; and the contradiction between river water silt regulation and fish habitat protection can be effectively relieved.

Constructing method for fish shelter under stress of high silt concentration flood

The invention relates to methods for analyzing the growth environment of Apostichopus japonicus(Selenka), in particular to a method for selecting a site for bottom sowing propagation of Apostichopus japonicus(Selenka). The method comprises the steps: (1) screening growth environment evaluation factors; (2) establishing piecewise functions which adopt specific values of the evaluation factors as independent variables and suitability values of the evaluation factors as dependent variables; (3) determining the weight values of the evaluation factors; (4) collecting the specific values of the evaluation factors in a target sea area; (5) substituting the specific values of the evaluation factors into the piecewise functions related to the evaluation factors so as to obtain the suitability values, corresponding to the specific values of the evaluation factors, of the evaluation factors; and (6) adopting a suitability exponential model into the suitability values of the evaluation factors inthe target sea area and the weight values of the evaluation factors so as to obtain the habitat suitability index of the target sea area. Through the method for selecting the site for bottom sowing propagation of Apostichopus japonicus(Selenka), it can be ensured that Apostichopus japonicus(Selenka) can have a most suitable growth environment in different target sea areas, so that the survival rate of Apostichopus japonicus(Selenka) is improved.

Method for selecting site for bottom sowing propagation of Apostichopus japonicus(Selenka)

The invention relates to the technical field of ecological analysis methods, in particular to an animal habitat model construction method. The animal habitat model construction method comprises the following steps: acquiring living environment data of a target animal to obtain living environment factors of the target animal; collecting a target animal sample to obtain target animal distribution characteristics; analyzing the relationship between the distribution characteristics of the target animals and the living environment factors of the target animals; and constructing a target animal habitat model based on an artificial neural network algorithm by taking the living environment factor of the target animal as an input layer variable and the distribution characteristic of the target animal as an output layer variable. According to the animal habitat model construction method, the living environment factor of the target animal is changed, and the target animal distribution characteristics under the influence of the living environment factors can be obtained, that is to say, when the living environment of the target animal changes, the animal distribution characteristics can stillbe obtained, so that the animal habitat model construction method is wider in application range, and the constructed model is more accurate.

Animal habitat model construction method

A method for establishing standards of habitat suitability includes the steps: firstly, determining typical fish species needing to be researched and life stages of the typical fish species in a researched river reach, researching the life stages and life habits of key species, performing unit division for the researched river reach and acquiring river reach habitat data; secondly, by means of a multiple linear regression method, respectively establishing habitat suitability functions represented by habitat variables and the habitat suitability represented by species response, and obtaining the relation between the species response and the habitat variables by combining the habitat suitability functions and the habitat suitability; and finally, solving regression coefficients of the species corresponding to a habitat variable relational expression by means of a least square method, and obtaining the habitat suitability standards established by means of the multiple linear regression method. The method can take interaction among the habitat variables into consideration, and determines response of the species by means of accumulative effects of multiple environmental characteristics, so that simulated results are more reasonable.

Yujun Yi

Papers

Method for determining habitat suitability