求翻译：目前国内外关于森林植被水源涵养及水土保持功能的研究很多，在学术界普遍认为森林的水源涵养作用主要集中在森林的林冠层、林下灌草层、林下枯枝落叶层、林地土壤层四个层面上。是什么意思？

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At present domestic and foreign are very many about the forest vegetation water source self-control and the conservation of water and soil function research, in the academic circles thought generally the forest the water source self-control function mainly concentrates in under the forest forest cro

Water conservation at home and abroad on forest vegetation and soil and water conservation function of many, generally consider water conservation function of forest in academia are mainly concentrated in the forest canopy, understory, shrub and herb layers, forest litter, soil layer on four levels.