中文摘要：

在表面沉积从的磷(P) 种类一浅， hypertrophic 湖，达恩奇湖，中国，被 P 分别调查并且 < 啜 class= “ a-plus-plus ” > 31 P 原子磁性的回声(NMR ) 光谱学在一个地区性的海藻的花蕾期间。另外，他们对 overlying 水的潜在的贡献也被评估。P 的易变的部分由 NH 提取了 < 潜水艇 class= “ a-plus-plus ” > 4 Cl，酸式碳酸盐 dithionite 和 NaOH 从 340.6 ～ 1,725.8 ? mg ? kg < 啜 class= “ a-plus-plus ” > 为 20.5 的 1 , 财务 ?% 67.2 ? 全部的 P 的 % 。P 恢复的二拍子的圆舞抽取方法精炼以前被执行 < 啜 class= “ a-plus-plus ” > 31 P NMR 分析。由联合 EDTA 预告的处理和 NaOH 或混合试剂，沉积 TP 和器官的 P 的恢复率从 31.8 ?% ～ 69.3 ?% 并且从 19.8 ?% ～ 51.7 ?% 。< 啜 class= “ a-plus-plus ” > 31 P NMR 结果显示出那 ortho-P， monoester-P 是在沉积的最丰富的 P 部件沉积的可引出的 P，由 diester-P 和 pyro-P 列在后面。ortho-P， diester-P 和 pyro-P 的和的空间分发检测了由 < 啜 class= “ a-plus-plus ” > 31 P NMR 与易变的 P 集中由分别决定了相应很好。两个在水列与全部的 P 展出了重要积极关联，建议内部装载可以是为湖生态系统的 P 的重要来源。除 ortho-P 以外的源於生物的 P 可以贡献浮游植物生长，与是的相对比例 4.4 ?% 18.7 ?% 。易变的 P 部分的版本造成了有机物的海藻的花蕾，和腐烂，跟随花蕾事件，消费了氧并且提高了 pH 价值。这合作依赖可能导致一个邪恶周期。各种各样的 P 种类的转变机制仍然保持模糊并且值得进一步的调查。

英文摘要：

Phosphorus（P） species in surface sediments from a shallow,hypertrophic lake,Lake Dianchi,China,were investigated by P fractionation and ^31P nuclear magnetic resonance（NMR） spectroscopy during a regional algal bloom.In addition,their potential contributions to the overlying water were also evaluated.Labile fractions of P extracted by NH4C1,bicarbonate dithionite and NaOH ranged from 340.6 to 1,725.8 mg kg^-1,accounting for20.5%-67.2%of the total P.A two-step extraction method refinement of P recovery was performed before the^31P NMR analysis.Recovery rates of sedimentary TP and organic P,by combining EDTA pretreatment and NaOH or mixed reagents,ranged from 31.8%to 69.3%and from19.8%to 51.7%.^31P NMR results showed that ortho-P and monoester-P were the most abundant P components in the sediment extractable P of sediments,followed by diester-P and pyro-P.Spatial distribution of the sum of ortho-P,diester-P and pyro-P detected by P NMR corresponded well with the labile P concentration determined by fractionation.Both exhibited a significant positive correlation with the total P in the water column,suggesting that internal loading may be an important source of P for the lake ecosystem.Biogenic P other than ortho-P may contribute to phytoplankton growth,with the relative proportion being 4.4%-18.7%.The release of labile P fractions fueled algal bloom,and the decay of organic matter,following the bloom events,consumed oxygen and elevated the pH value.This co-dependence might lead to a vicious cycle.Transformation mechanisms of various P species remain ambiguous and are worthy of further investigation.