The paper dealt with the defect of present value accounting,discussed the average value,distribution and marginal value of forest and pointed out the problems of ecological construction that should be paid attention to.

Calculation of economic recoverable reserves of oilfield with marginal analysis method;

The authors study the marginal values, economic outputs and economic profits of various well stimulations by means of the theory and method of marginal analysis and the statistics analysis of the field data in recent years.

When the priori probabilities and likelihood functions of the local detectors are unknown, the optimal detection fusion models at the fusion center are derived based on the combination of Bayesian assumption with marginal analysis method.

Using the fractal theory,elasticity analysis and marginal yield analysis,the regressive model on the fractal dimension of soil granular structure to soil aggregate content and structure damage percentage was figured out to study the effect on the soil granular structure in different mixed proportion stand C.

In this paper, the fractal theory, elasticity analysis and marginal yield analysis were used to study the soil aggregation structure in different management patterns.

Based on the fractal theory,elasticity analysis and marginal yield analysis,this paper studied the fractal model of soil cluster structures under different precious hardwood stands in the central subtropical region of China.

By combining the principle of marginal analytical method with the time value factor of fund, the dynamic state model about the optimization of cut_off grade in open_pit mine and its adjustment of service life year by year are built, and the practical calculation is carried out.