| Construction of a set of the scientific, systematic and operational evaluation criteria and index system that is suitable for the benefit evaluation of forestry ecological engineering has been the problem which must be investigated and resolved, and also is a hot-spot problem in the domain of forestry science. To counter the hot-spot problem, based on the analysis for the characteristics of forestry ecological engineering benefit evaluation system and the theories and methods in realm of benefit evaluation, combined the traditional system theory and method, the modern system theory and method, the synthetical integration method and the generalized induction method in the realm of social science, the first study on the methodology of forestry ecological engineering benefit evaluation was made, the soft system method of induction integration (SSMII) was constructed. By means of SSMII, a set of a scientific and practical benefit evaluation index system of forestry ecological engineering was set up. As an example of the protective forest engineering of the Chuanjiang valley in the middle-upper reach of Changjiang river, based on a host of the field investigation reference, monitoring reference of the position and semi-position station, and forestry statistic reference, the comprehensive benefit evaluation study of protective forest engineering was made, problems existed in the construction of the protective forest engineering and the way to deal with them were put forward. Relation models between the comprehensive benefit evaluation value and the quantitative benefit value were also constructed by means of regression analysis methods. In brief, there are 4 main products or realizations with distinctive features combined by multi-speciality, multi-subject,multi-field, etc. as follows:1. Based on soft system method (SSM), system engineering method (SEM), synthetical integration method (SIM) and the generalized induction method (GIM)in the realm of social science, the soft system method of induction integration (SSMII) of forestry ecological engineering benefit evaluation is constructed. SSMII is composed of four related stages, analysis stage of objective and assignment: the distinct and accepted narrative system of complicated soft system problems with inexplicit objectives and indistinct structures is formed by means of the generalized induction method in form of expert meeting or advisory. Scientific disposal stage of problems: by means of structural analysis of problem system, unwell-defined problem is deal with, and transformed into well-defined problem with help of the soft system method. Seeking countermeasure stage: semi-structure problem is deal with by ways of synthetical integration method. Resolving problem stage: well-defined problem is deal with by ways of system engineering method, and resolved satisfactorily.2. According to SSMII, the constructing technique of index system and the calculating technique of indexes are systematically studied, a set of benefit evaluation index system is constructed, which conclude 3 A-class indexes, 11 B-class indexes and 39 C-class indexes, and weight of indexes is also calculated. By means of evaluation index system constructed, the trial evaluation of protective forest benefits is carried out, the result shows the valuation index system is rational and feasible, and applied to the comprehensive benefit evaluation of forestry ecological engineering.3. Based on practical needs of the forestry policy-making and administrative departments, a set of the simplified benefit evaluation index system is constructed in the light of SSMII, which conclude 39 A-class indexes, 8 B-class indexes and 14C-class indexes, and weight of indexes was also calculated. Meanwhile, present situation and development of forestry ecological engineering benefits (for example the protective forest engineering of Chuanjiang valley) are evaluated by the use of the simplified index system in levels of forest types, county, branch valleys and Chuanjiang valley. Four new achievemen...
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