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引用本文:杨洪,易朝路,邢阳平,谢平.武汉东湖沉积物孔隙度与含水量.湖泊科学,2004,16(1):69-73. DOI:10.18307/2004.0110
YANG Hong,YI Chaolu,XING Yangping,XIE Ping.Porosity and Water Content of Sediments in Lake Donghu, Wuhan. J. Lake Sci.2004,16(1):69-73. DOI:10.18307/2004.0110
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武汉东湖沉积物孔隙度与含水量
杨洪1,2, 易朝路3, 邢阳平4, 谢平2
1.中国科学院测量与地球物理研宄所环境与国土研宄室, 武汉 430077;2.中国科学院水生生物研宄所东湖湖泊生态实验站, 武汉 430072;3.南京大学城市与资源学系, 南京 210093;4.华南热帯农业大学农学院, 儋州 5717003中国科学院水生生物研宄所东湖湖泊生态实验站, 武汉 430072
摘要:
对采自武汉东湖Ⅰ站、Ⅱ站的沉积物采用一种新的方法计算孔隙度:拍摄扫描式电子显微镜(SEM)图像,采用局部区域阈值化的方法对图像进行阈值化(thresholding)处理,运用自编程序求出孔隙度的垂直变化.结合含水量的垂直变化,分析孔隙度与含水量之间的关系,并对影响它们垂直变化的因素进行了讨论.结果表明:SEM图像局部区域阈值化法是研究沉积物孔隙度的有效方法;孔隙度与含水量表层较大,从表层到底层呈明显的下降趋势;孔隙度(K)与含水量(H)有比较好的正相关.运用拟合的相关方程式,可以由较易获得的东湖Ⅰ站和Ⅱ站的含水量反推较难获得的孔隙度.
关键词:  东湖  沉积物  阈值化处理  孔隙度  含水量  相关分析
DOI:10.18307/2004.0110
分类号:
基金项目:国家自然科学基金(4997108);中国科学院东湖生态系统实验站开放基金(200105)
Porosity and Water Content of Sediments in Lake Donghu, Wuhan
YANG Hong1,2, YI Chaolu3, XING Yangping4, XIE Ping2
1.Department of Environmental Science, Institute of Geodesy and Geophysics, CAS, Wuhan 430077, P.R.China;2.Donghu Experimental Station of Lake Ecology, Institute of Hydrobiology, CAS, Wuhan 430072, P.R.China;3.Department of Environment and Resource Sciences, Nanjing University, Nanjing 210093, P.R.China;4.Agriculture College, South China University of Tropic Agriculture, Danzhou 571700, P.R.ChinaDonghu Experimental Station of Lake Ecology, Institute of Hydrobiology, CAS, Wuhan 430072, P.R.China
Abstract:
Two undisturbed sediment cores of 95cm and 150cm at the Station I and Ⅱ in Lake Donghu, Wuhan, were collected respectively.A new method was used to calculate the samples' porosity with the following procedures: the images of the samples were taken in scanning electron microscope (SEM);thresholding of the images were taken by the selection method for local threshold;and the variations of porosity and water content with the depth were analysised by the self-made program.Furthermore, the factors that affect the variations of porosity and water content with the depth were discussed.The relationship of porosity with water content was studied as well.The results show that:(1) SEM images local thresholding method was a new feasible and effective method of researching sediments' porosity.The results were reliable.(2) At Station I and Station Ⅱ in Lake Donghu, sediment porosity fluctuated greatly in the surface layer due to water disturbance.Reduction of sediment porosity with depth was the results of decrease of the organic matter (OM) content and disturbance and increase of the gravitational compaction.Gravitational compaction was modelled by an logarithm equation that gave the sediment porosity as a function of burial depth.The variations of the sediment porosity with depth were modelled by logarithm equations.(3) In the surface layer, the water content exhibited an abrupt decrease with depth due to the decrease of bio-perturbation and organic matter content (OM).Under gravitational compaction, the water content exhibited an obvious decrease with depth from surface layer to substrate.(4)Porosity(K) was well correlated with water content(H), and they were both in positive correlation.The correlation equations were: H1=7.3571×K1-240.60(r=0.80);H2=2.65×K2-55.07(r=0.84).Using the equations, we could calculate porosity of the sediments at Station I and Station Ⅱ in Lake Donghu, which can not be easily made, from water content that can be easily obtained.
Key words:  Lake Donghu  sediment  porosity  water content  correlation analytis
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