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title = {{Mycorrhizal weathering of apatite as an important calcium source in base-poor forest ecosystems}},  journal = {Nature},  }  @article{Berner_1992,  doi = {10.1016/0016-7037(92)90300-8},  url = {http://dx.doi.org/10.1016/0016-7037(92)90300-8},  year = {1992},  month = {aug},  publisher = {Elsevier {BV}},  volume = {56},  number = {8},  pages = {3225--3231},  author = {Robert A. Berner},  title = {{Weathering plants, and the long-term carbon cycle}},  journal = {Geochimica et Cosmochimica Acta},  }