Digging new ponds can be much more useful to wildlife than planting trees - trees will self-seed if land is left alone whereas ponds are much less likely to create themselves. Often it is easier and cheaper to create a new pond than to dredge an existing one. It may be that your pond is in a marshy area and you may be better off digging small shallow pools rather than undertaking big excavations. In deciding how much you should be dredging your pond or ponds you may want to do a sort of "loss vs benefit analysis" - ponds which are soak-aways from heavily-fertilised agricultural areas are likely to be poor in wildlife and by dredging you may be able to remove polluted sediments and hopefully create silt traps and ways to buffer the pond from future pollution.
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