整体森林生态效益价值呈下降趋势，特别是森林的涵养水源和保持水土效益价值在森林面积增加的情况下反而下降。
The whole ecological benefit shows downtrend, especially the area of nutrient waterhead and water and soil benefit in forest get large, and on the contrary the forest area lessens.
森林生态效益补偿制度的生命在于其价值和功能的实现。
The key of forest ecological benefit compensation system lies in realizing its values and functions.
但由于森林生态效益的外在性，使得其价值补偿无法实现，从而成为我国森林生态建设的根本性制约因素。
However, the externality of forest ecological effect makes its value cannot be compensated, which becomes principally limit factor for forest ecological construction.
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