| 巢湖十五里河沉积物磷吸收潜力及对外源碳的响应 |
| 摘要点击 1495 全文点击 577 投稿时间：2018-12-23 修订日期：2019-01-11 |
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| 中文关键词 磷吸收潜力 生物非生物吸收 沉积物 外源碳添加 巢湖 |
| 英文关键词 phosphorus uptake potential biotic and abiotic uptake sediment carbon addition Chaohu Lake |
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| 中文摘要 |
| 2017年7月（夏季）和2018年1月（冬季），在巢湖十五里河干流的城乡梯度方向选择5个代表性采样点位，采集表层沉积物样，利用实验室培养法，测算沉积物磷的总吸收潜力SPUlive、非生物吸收潜力SPUkill和生物吸收潜力SPUbiotic，评估不同外加碳源（乙酸钠、葡萄糖及两者的混合溶液）对SPUbiotic的影响水平.结果表明，十五里河沉积物SPUlive存在时空差异性，且表现为SPUkill高于SPUbiotic；未添加碳源时，夏季和冬季的SPUkill均值分别为3.016 μg·（g·h）-1和3.368 μg·（g·h）-1，SPUbiotic均值分别为0.784 μg·（g·h）-1和0.323 μg·（g·h）-1，夏、冬两季的非生物吸收潜力存在显著差异性；添加外源碳后，不仅SPUbiotic有了较大幅度的提升，生物因素在沉积物磷吸收中的贡献率水平也有了明显提高，且两者均表现为添加乙酸钠效果最显著，添加葡萄糖效果次之，混合碳源的效果相对较弱.由沉积物磷的生物吸收对外源碳的响应情况，可以判定十五里河沉积物磷吸收存在一定程度的碳限制性. |
| 英文摘要 |
| Surficial sediments were collected from five sampling sites in the mainstream of the Shiwuli River along an urban-rural gradient in the Chaohu Lake basin during July 2017 (summer) and January 2018 (winter). The total uptake (SPUlive), abiotic uptake (SPUkill), and biotic uptake (SPUbiotic) of phosphorus by sediments were measured, and uptake responses to different carbon sources (i. e., sodium acetate, glucose, and a mixture of both) were explored quantitatively through incubation experiments. The results showed that SPUlive had obviously spatiotemporal variations across the five sites, and SPUkill was higher than that of SPUbiotic. Under no carbon added, the mean values of SPUkill were 3.016 μg·(g·h)-1 and 3.368 μg·(g·h)-1, and the average values of SPUbiotic were 0.784 μg·(g·h)-1 and 0.323 μg·(g·h)-1 in summer and winter, respectively. Moreover, significant differences were found in abiotic phosphorus uptake between the two months. In the presence of carbon addition, both the value of SPUbiotic and the contribution rate of biotic phosphorus uptake showed a distinct increase. In general, the magnitude and rate of biotic uptake of phosphorus by sediments was highest when sodium acetate was added, followed by glucose, while the effect of mixed carbon was the worst. The responses of biotic phosphorus uptake to carbon addition suggested that the uptake potential of phosphorus by sediments in Shiwuli River was restricted by the carbon availability to some degree. |
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