主题：【已应助】求助4篇文献，谢谢大家相助

【篇号】:1
【作者】Howard-williams, C. and Allanson, B. R.
【文章标题】Phosphorus cycling in a dense potamogeton pectinatus l. Bed.
【期刊名，年份，卷（期），起止页码】Oecologia 1981. 49(1):56-66.
【全文链接】http://link.springer.com/article/10.1007/BF00376898
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【篇号】:2
【作者】Van Cappellen, P. and Berner, R. A.
【文章标题】A mathematical model for the early diagenesis of phosphorus and fluorine in marine sediments; apatite precipitation.
【期刊名，年份，卷（期），起止页码】American Journal of Science 1988. 288(4):289-333.       
【全文链接】http://www.ajsonline.org/content/288/4/289.extract
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【篇号】:3
【作者】Ahlgren, J., Tranvik, L., Gogoll, A., Waldeback, M., Markides, K. and Rydin, E.
【文章标题】Sediment depth attenuation of biogenic phosphorus compounds measured by p-31 nmr.
【期刊名，年份，卷（期），起止页码】Environmental Science & Technology 2005. 39(3):867-872.
【全文链接】http://pubs.acs.org/doi/abs/10.1021/es049590h
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【篇号】:4
【作者】Guppy, C. N., Menzies, N. W., Moody, P. W. and Blamey, F. P. C.
【文章标题】Competitive sorption reactions between phosphorus and organic matter in soil: A review.
【期刊名，年份，卷（期），起止页码】Soil Research 2005. 43(2):189-202.       
【全文链接】http://www.publish.csiro.au/?paper=SR04049
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