| 太湖五里湖沉降通量及其有机质分解率研究 |
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| 引用本文： | 胡春华,濮培民.太湖五里湖沉降通量及其有机质分解率研究[J].海洋与湖沼,2000,31(3):327-333. |
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| 作者姓名： | 胡春华 濮培民 |
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| 作者单位： | 中国科学院南京地理与湖泊研究所,南京,210008 |
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| 基金项目： | 中国国家科委和欧洲联盟科技部资助项目!C11＊ －CT93－0094（DG12HSMU） |
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| 摘 要： | 为了进一步探索重富营养化湖泊水质形成机理，１９９６年７月１９日－９月２日，在太湖北端湖湾重富营养化水体－－五里湖中层水体进行了试验。通过对微分方程的积分与数理统计分析，确定了该湖区该时段平均沉降通量为４０５ｇｄ＾－１ｍ＾－２，其中有机质沉降通量是无机沉降通量的３倍，有机质初始分解率为０．０１２５１ｈ＾－１，长期分解率为０．００６６２ｈ＾－１，１个月的时间就有８０％的有机质分解掉。这种作用造成许多重
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| 关 键 词： | 沉降通量 有机质分解率 太湖 五里湖 水质 |
| 收稿时间： | 1998/7/14 0:00:00 |
| 修稿时间： | 1999/1/12 0:00:00 |
DOWWARD FLUX OF SUSPENDED SUBSTANCE AND ORGANIC DECOMPOSITION RATE IN WULIHU BAY, TAIHU LAKE |
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| HU Chun-hua and PU Pei-min.DOWWARD FLUX OF SUSPENDED SUBSTANCE AND ORGANIC DECOMPOSITION RATE IN WULIHU BAY, TAIHU LAKE[J].Oceanologia Et Limnologia Sinica,2000,31(3):327-333. |
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| Authors: | HU Chun-hua and PU Pei-min |
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| Institution: | Nanjing Institute of Geography and Limnology, The Chinese Academy Of Sciences, Nanjing210008;Nanjing Institute of Geography and Limnology, The Chinese Academy Of Sciences, Nanjing210008 |
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| Abstract: | In order to explore furthter the water-quality-change mechnism in hypertrophic lakes, the test was undertaken for the griddle water layer in hypertrophic Wulihu Bay, northern Taihu Lake, during the period from July 19 to September 2 in 1996. On the basis of differential-equation integration calculus and mathmatical and physical statistics, it was found that in this part of the lake during the pened the downward flux was 405 gd~(-1) m~(-2) on average, and that the downward organic fluxes were three times more than the downward inorganic fluxes. The initial decomposition rate of organic substances is about 0.012 51 h~(-1), and the long-term decomposition rate is 0.006 62 h~(-1), the instantaneous decomposition rate (D, h~(-1)) may be described by the following eqution: D = 0.006 624 1 0.005 859e~(-0.006 624 1t), where t is bine (h). Around 80% of the organic substance was decomposited within a mouth. In many hypertrophic lakes it appears that transparency is low and chlorophyll-a is not high when suspended substances are domained by dead algae. After algae die, they drop progressively, mineralize and are decomposed simultaneously, then the remains and mineralized substances retum to water body, and the nutrientS are absorbed and utilized by the newborn algae. Thus, the water quality changes are for long periods in vicious circles in the hypertrophic lake. The effects of rinsing and dredging ect, which cannot break the vicious circle, are not very ideal. The phenomenon should be taken into account during harnessing the present hypertrophic lake. |
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| Keywords: | Downward flux of suspended substance Organic decomposition rate Taihu Lake Wulihu Bay |
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