| Taking 8 kinds of different water resource protection forests, including Platycladus orientalis (Linn.)Franco, Pinus tabulaefornis Carr., Robinia pseudoacacia L., Acer truncatum Bunge, Tilia amurensis,, coniferous and broad-leaved mixed forest, Larix princis-rupprechtii Mayr., Mixed broad leaved in Badaling forest center as study subject. Through research on the indexes of maintaining Ecosystem stability function, Hydrological function and Soil characteristic ecological function, using the Analytical Hierarchy Process to determine the Weight of each assessment indicator, and utilizing the mathematical model of the Synthetic Evaluation to evaluate the ecological function of the different kinds of water resource protection forests, obtained the ecological function conditions of each water resource protection forests, and proposed the working and regulative measures which were good for improving each forests's ecology function.(1) The total biomass of the different kinds of water resource protection forests in Badaling forest center ranging from 42.07 t/hm~2 to 83.77 t/hm~2. Decrease in turn is: Larix princis-rupprechtii Mayr., Tilia amurensis, Mixed broad leaved, Pinus tabulaefornis Carr., Acer truneatum Bunge, coniferous and broad-leaved mixed forest, Robinia pseudoacacia L., Platycladus orientalis (Linn.)Franco. Different forest displayed the obvious coherence in the vertical distribution pattern, the arbor layer biomass occupied the absolute superiority in the total biomass, the shrub biomass are in the middle and the herb biomass were least. Among eight different water resource protection forests, the various organs biomass of the arbor layer biomass occupied the proportion order was: the stem＞the branch＞the leaf.(2) The biodiversity of the different kinds of water resource protection forests in Badaling forest center decrease is in turn: Mixed broad leaved, coniferous and broad-leaved mixed forest, Acer truncatum Bunge, Tilia amurensis, Pinus tabulaefornis Cart., Robinia pseudoacacia L., Platycladus orientalis (Linn.)Franco, Larix princis-rupprechtii Mayr.. In general, the biodiversity of the mixed forests are higher than the pure forests'. The species richness and the species biodiversity displayed the tendency that the herb layer is higher than the shrub layer among the different kind of water resource protection forests, but the species evenness performed the trend that the shrub layer is higher than the herb layer.(3) The interception of the different kinds of water resource protection forests in Badaling forest center is very big, from 40.44mm to 61.41mm. In general, coniferous forest and the mixed forests' interception are bigger, and the broad-leaved forest' interception is smaller.(4) The litter thickness ranging from 15mm to 40mm; The litter layer biomass has more differences, Larix princis-rupprechtii Mayr. is the most by 22.85 t/hm~2, and Robinia pseudoacacia L. is least by 15.16 t/hm~2; The maximum moisture holding capacity of the litter is connected with the composition of the forests. The maximum moisture holding capacity of the litter is different from each other. The maximum moisture holding capacity of the litter of Tilia amurensis is biggest by 61.10 t/hm~2, The maximum moisture holding capacity of the litter of Platycladus orientalis (Linn.) Franeo is least by 28.35 t/hm~2.(5) Tilia amurensis's biggest water-holding capacity of soil is the most, Platycladus orientalis (Linn.)Franco's biggest water-holding capacity of soil is the least. In general, the water-holding capacity of soil of the most of broad-leaved forests and the mixed forests are higher than the coniferous forest'. The bulk density of Platycladus orientalis (Linn.)Franco. is the most by 1.28g/cm~3, The bulk density of Mixed broad leaved is the least by 1.07g/cm~3, the changing rules approximately is that the coniferous forest and the broad-leaved forest are bigger than the mixed forests. The soil total porosity ranging from 51.07% to 59.62%, the trend of the soil total porosity is opposite to the soil bulk density.(6) Through study on the Soil infiltration capability of the different kinds of water resource protection forests in Badaling forest center, the Soil infiltration capability of Mixed broad leaved is the fastest by 3.86mm/min, in the coniferous forests, the Soil infiltration capability of Platycladus orientalis (Linn.)Franco is slowest by 3.86mm/min. The research indicated that the coniferous and broad-leaved mixed forest and the broad-leaved forest infiltrating speed are bigger than the coniferous forest'.(7) The comprehensive ecological fimction of the eight kinds of water resource protection forests from large to small in turn is: Mixed broad leaved, coniferous and broad-leaved mixed forest, Tilia amurensis., Pinus tabulaefomis Carr., AcertruncatumBunge, Larix princis-rupprechtii Mayr., Robinia pseudoacacia L., Platycladus orientalis (Linn.)Franco. The comprehensive ecological function of Platycladus orientalis (Linn.)Franco. is only the Mixed broad leaved' 74.97%. The comprehensive ecological function of the broad-leaved forest are better than the pure forests. In the different water resource protection forests, the combination of each influence indicator as well as the resultant styles are different, therefore, maintaining the ecosystem stability function, Hydrological ecological function, Soil characteristic ecological function and the contributions to the comprehensive ecological functions are different each other. (8) In view of the different forests, the paper proposed the different management and the nurture measure including:①The density of the Larix princis-rupprechtii Mayr. is bigger than others, there are more rotted tree and blast tree in the forests, through cleaning up the deadwood to improve the structure and the hygienic condition, increase the penetrability in the forest in order to make the forest display arbor-shrub-herb three-dimensional disposition to improve the nutrient conditions and the physical structures of the soil greatly.②Regarding the big areas pure forests, such as Pinus tabulaefornis Carr., Acertruncatum Bunge and so on, using Mixed broad leaved, coniferous and broad-leaved mixed forest, Mixed forest of trees and shrubs and so on to resolve the question on trees simplification in water resource protection forests.③The canopy of Platycladus orientalis (Linn.)Franco is smaller and cannot make good use of the soil fertility, it should be replanted with the broad-leaf trees, such as quercus, Acer truncatum Bunge and so on, forming block mosaic mixed forests gradually.
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