环境梯度及大型底栖动物对于新西兰Whangateau海湾潮间带沉积物侵蚀性的影响

发布时间：2018-01-11 11:19

  本文关键词：环境梯度及大型底栖动物对于新西兰Whangateau海湾潮间带沉积物侵蚀性的影响　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

  更多相关文章： 潮间带 沉积物侵蚀性 Whangateau海湾 环境梯度 底栖动物

【摘要】：海口海岸带海水悬浮物的浓度和底床沉积物再搬运对生态系统功能存在负面影响。因此,沉积物是否会再悬浮的研究在预测沉积物、生物栖息地以及生态系统的命运都是至关重要的。本文在新西兰Whangateau海湾19个取样点中使用EROMES取芯器采集了57个沉积物样本并测量了侵蚀速率,分析了样品的沉积物粒径、有机质含量、孔隙度、叶绿素-α浓度、大型底栖动物等参数。通过PRIMER软件的MTDLM(The Marginal-test in DistLM)模型的计算,将上述参数归并为M1,M2,M3组合。通过SWDLM(The Specified Step-wise in DistLM)模型的计算,将参数归并为S1,S2,S3组合。研究了上述变量及变量组合对于沉积物侵蚀和悬浮潜力的影响。nMDS模块样品相似性计算结果表明,底栖动物组合在实验样品中相似性较差,反映了所取样品具有广泛代表性。样品含泥量、平均粒径和孔隙度分别占侵蚀阈值权重的7.6%、11.0%和16.2%;含泥量、平均粒径、孔隙度和有机质含量分别占侵蚀速率权重的8.8%、18.0%、25.3%和16.5%。MTDLM模型中组合M1变量群的中值粒径、Paphies australis与含泥量分别占侵蚀阈值权重的11.6%,10.7%和10.6%;组合M2变量群的幼年Macomona liliana、Paphies australis、Prionospio aucklandica及平均粒径分别占侵蚀速率权重的38.6%、24.4%、20%及18.1%;组合M3变量群的成年Macomona liliana、Perinereis vallata分别占侵蚀常数权重的21.5%及8.8%。SWDLM模型组合S1约占侵蚀阈值权重的28%;组合S2约占侵蚀速率权重的74.5%;组合S3约占侵蚀常数权重的21.5%。在潮间带生态环境中,上述各种参数及组合均影响沉积物的侵蚀。沉积物侵蚀的初期,MTDLM模型的平均粒径、中值粒径、含泥量、叶绿素-α浓度、有机质含量、孔隙度和SWDLM模型中的平均粒径对沉积物侵蚀影响较大。生物因素对于沉积物的侵蚀和悬浮持续存在重要影响。叶绿素-α浓度与生物因素相关性较高,其对沉积物的侵蚀和悬浮的影响是通过生物变量间接实现的。
[Abstract]:The concentration of suspended matter and retransport of bottom sediment in Haikou coastal zone have negative effects on ecosystem function. Therefore, the study of whether sediment will be suspended again is used to predict sediment. The fate of habitats and ecosystems is critical. In this paper, 57 sediment samples were collected from 19 sampling sites in Whangateau Bay, New Zealand, using a EROMES coring device. The erosion rate was measured. The sediment particle size, organic matter content, porosity and chlorophyll-伪 concentration were analyzed. The parameters of macrobenthos were calculated by MTDLM(The Marginal-test in DistLM model of PRIMER software. The above parameters were merged into the combination of M _ (1) M _ (2) M _ (2) M _ (3) and calculated by the SWDLM(The Specified Step-wise in DistLMmodel. The influence of the above variables and their combinations on sediment erosion and suspended potential was studied. The similarity of benthic assemblage in experimental samples is poor, which indicates that the samples are widely representative. The average particle size and porosity of the samples account for 7.6% of the weight of erosion threshold, respectively. 11.0% and 16.2B; Soil content, average particle size, porosity and organic matter content account for 18.0% of the weight of erosion rate, respectively. In the model of 25.3% and 16.5. MTDLM, the median particle size and sediment content of M1 variable group are 11.6% of the weight of erosion threshold, respectively. 10.7% and 10.6; The infant Macomona liliana Paphies australis of a group of M2 variables. The weight of Prionospio aucklandica and average particle size in erosion rate was 38.6% and 18.1%, respectively. Adult Macomona liliana combined with M3 variable group. Perinereis vallata account for 21.5% and 8.8. SWDLM model of erosion constant, respectively. S1 is about 28% of erosion threshold weight. Combination S2 accounts for 74.5% of the weight of erosion rate; In the intertidal ecological environment, the above parameters and combinations all affect the erosion of sediment. The average particle size of MTDLM model in the early stage of sediment erosion. Median particle size, mud content, chlorophyll-伪 concentration, organic matter content. Porosity and average particle size in SWDLM model have great influence on sediment erosion. Biological factors have an important effect on sediment erosion and suspension. The concentration of chlorophyll-伪 is highly correlated with biological factors. Its effect on sediment erosion and suspension is indirectly realized by biological variables.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：Q958.8;P736.21
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