本文關(guān)鍵詞：環(huán)境梯度及大型底棲動(dòng)物對(duì)于新西蘭Whangateau海灣潮間帶沉積物侵蝕性的影響　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 潮間帶 沉積物侵蝕性 Whangateau海灣 環(huán)境梯度 底棲動(dòng)物

【摘要】：海口海岸帶海水懸浮物的濃度和底床沉積物再搬運(yùn)對(duì)生態(tài)系統(tǒng)功能存在負(fù)面影響。因此,沉積物是否會(huì)再懸浮的研究在預(yù)測(cè)沉積物、生物棲息地以及生態(tài)系統(tǒng)的命運(yùn)都是至關(guān)重要的。本文在新西蘭Whangateau海灣19個(gè)取樣點(diǎn)中使用EROMES取芯器采集了57個(gè)沉積物樣本并測(cè)量了侵蝕速率,分析了樣品的沉積物粒徑、有機(jī)質(zhì)含量、孔隙度、葉綠素-α濃度、大型底棲動(dòng)物等參數(shù)。通過(guò)PRIMER軟件的MTDLM(The Marginal-test in DistLM)模型的計(jì)算,將上述參數(shù)歸并為M1,M2,M3組合。通過(guò)SWDLM(The Specified Step-wise in DistLM)模型的計(jì)算,將參數(shù)歸并為S1,S2,S3組合。研究了上述變量及變量組合對(duì)于沉積物侵蝕和懸浮潛力的影響。nMDS模塊樣品相似性計(jì)算結(jié)果表明,底棲動(dòng)物組合在實(shí)驗(yàn)樣品中相似性較差,反映了所取樣品具有廣泛代表性。樣品含泥量、平均粒徑和孔隙度分別占侵蝕閾值權(quán)重的7.6%、11.0%和16.2%;含泥量、平均粒徑、孔隙度和有機(jī)質(zhì)含量分別占侵蝕速率權(quán)重的8.8%、18.0%、25.3%和16.5%。MTDLM模型中組合M1變量群的中值粒徑、Paphies australis與含泥量分別占侵蝕閾值權(quán)重的11.6%,10.7%和10.6%;組合M2變量群的幼年Macomona liliana、Paphies australis、Prionospio aucklandica及平均粒徑分別占侵蝕速率權(quán)重的38.6%、24.4%、20%及18.1%;組合M3變量群的成年Macomona liliana、Perinereis vallata分別占侵蝕常數(shù)權(quán)重的21.5%及8.8%。SWDLM模型組合S1約占侵蝕閾值權(quán)重的28%;組合S2約占侵蝕速率權(quán)重的74.5%;組合S3約占侵蝕常數(shù)權(quán)重的21.5%。在潮間帶生態(tài)環(huán)境中,上述各種參數(shù)及組合均影響沉積物的侵蝕。沉積物侵蝕的初期,MTDLM模型的平均粒徑、中值粒徑、含泥量、葉綠素-α濃度、有機(jī)質(zhì)含量、孔隙度和SWDLM模型中的平均粒徑對(duì)沉積物侵蝕影響較大。生物因素對(duì)于沉積物的侵蝕和懸浮持續(xù)存在重要影響。葉綠素-α濃度與生物因素相關(guān)性較高,其對(duì)沉積物的侵蝕和懸浮的影響是通過(guò)生物變量間接實(shí)現(xiàn)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-偽 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-偽 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-偽 is highly correlated with biological factors. Its effect on sediment erosion and suspension is indirectly realized by biological variables.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q958.8;P736.21
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本文編號(hào)：1409324