發(fā)布時(shí)間：2018-07-11 10:32

  本文選題：長江中游 + 網(wǎng)湖��； 參考：《環(huán)境科學(xué)》2017年09期

【摘要】：通過對(duì)網(wǎng)湖沉積巖芯中正構(gòu)烷烴含量和組成特征的分析,探討了網(wǎng)湖近百年來的湖泊環(huán)境變化.結(jié)果表明,網(wǎng)湖沉積巖芯中正構(gòu)烷烴的碳數(shù)范圍在n-C14~n-C33之間,其中以高碳數(shù)組分為主,并具有明顯的奇偶優(yōu)勢,反映了沉積物有機(jī)質(zhì)以大型水生植物和陸生植物貢獻(xiàn)為主,較低的2n-C31/(n-C27+n-C29)比值指示陸源輸入中以木本植物輸入為主.根據(jù)正構(gòu)烷烴參數(shù)指示的沉積物有機(jī)質(zhì)來源變化特征,近百年來網(wǎng)湖水體環(huán)境變化具有如下3個(gè)階段:20世紀(jì)50年代以前,網(wǎng)湖與長江水體交換頻繁,湖泊水體處于低營養(yǎng)環(huán)境狀態(tài),沉積物正構(gòu)烷烴高/低分子量正構(gòu)烷烴比值(H/L)和陸/水生類脂物比值(TAR)較高,沉積物有機(jī)質(zhì)主要來源于陸生植物和大型水生植物,湖泊浮游藻類貢獻(xiàn)少;20世紀(jì)50~80年代,H/L和TAR值明顯下降,中、短鏈正構(gòu)烷烴的比例略有升高,表明陸源植被對(duì)沉積物有機(jī)質(zhì)的貢獻(xiàn)降低,水生植物和浮游藻類貢獻(xiàn)的有機(jī)質(zhì)增加,但較低的2n-C17/(n-C23+n-C25)值表明浮游藻類有機(jī)質(zhì)較低,此時(shí)湖泊水體較為穩(wěn)定,湖泊受長江水位影響減小,湖泊營養(yǎng)水平有所升高;1980s以來,總體上湖泊受流域人類活動(dòng)影響明顯,湖泊水體營養(yǎng)水平升高,沉積物正構(gòu)烷烴表現(xiàn)為H/L和TAR值升高后下降,正構(gòu)烷烴總量和2n-C17/(n-C23+n-C25)比值顯著升高,2000年后尤其明顯,表明湖泊沉積物有機(jī)質(zhì)輸入增加,其中湖泊浮游藻類貢獻(xiàn)明顯增加.
[Abstract]:Based on the analysis of the content and composition of n-alkanes in the depositional core of the reticustrine lake, the changes of the lake environment in the last hundred years are discussed. The results show that the carbon number of n-alkanes is in the range of n-C14n-C33, in which the high carbon array is dominant, and the advantages of parity and even are obvious, which indicates that the organic matter of sediments is mainly contributed by macroaquatic plants and terrestrial plants. The lower ratio of 2n-C31 / (n-C27 n-C29) indicates that woody plant input is the main input. According to the source characteristics of organic matter in sediments indicated by normal alkane parameters, the environmental changes of the water body of the net lake in the last hundred years have three stages: before the 1950s, the water bodies of the net lake and the Yangtze River are exchanged frequently. The lake water was in a low nutrient environment, and the ratio of normal alkanes (H / L) and lipids (tar) in sediments was higher. The organic matter in sediments was mainly derived from terrestrial plants and macroaquatic plants. The contribution of phytoplankton in lakes was less than that in the 1950s and 1980s, and the ratio of n-alkanes of short chain and middle chain decreased obviously, indicating that the contribution of terrestrial vegetation to sediment organic matter decreased, and that of aquatic plants and phytoplankton increased. However, the lower value of 2n-C17 / (n-C23n-C25) indicates that the organic matter of phytoplankton is low, the lake water is stable, the lake is affected by the Yangtze River water level and the lake nutrition level has been increased since 1980's, and the lake is obviously affected by the human activities in the basin. The nutrient level of lake water increased, the normal alkanes in sediments decreased after the increase of H / L and tar values, the total amount of normal alkanes and the ratio of 2n-C17 / (n-C23 n-C25) increased significantly, especially after 2000, which indicated that the input of organic matter in lake sediments increased. Among them, the contribution of phytoplankton in lakes is obviously increased.
【作者單位】： 中國科學(xué)院南京地理與湖泊研究所湖泊與環(huán)境國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);
【基金】：國家自然科學(xué)基金項(xiàng)目(41373017,41576171)
【分類號(hào)】：X524

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李華,王紅旗,齊永強(qiáng);土壤正構(gòu)烷烴微生物降解變化實(shí)驗(yàn)分析[J];環(huán)境科學(xué)研究;2003年05期

2 王文巖;張娟;王林權(quán);侯紅;李發(fā)生;李雪芳;;西安城郊土壤中正構(gòu)烷烴的分布、來源及其影響因素[J];農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào);2014年04期

3 康躍惠,盛國英,傅家謨,麥碧嫻,張干,林崢,閔育順;珠江澳門河口沉積物柱樣品正構(gòu)烷烴研究[J];地球化學(xué);2000年03期

4 宮景霞;正構(gòu)烷烴氣相色譜指紋法鑒別海面溢油源[J];福建環(huán)境;2002年06期

5 呂曉霞;翟世奎;;長江口沉積物中正構(gòu)烷烴的分布特征及其環(huán)境指示意義[J];環(huán)境科學(xué)學(xué)報(bào);2008年06期

6 郭方琴;張成君;張?jiān)?劉艷;黃雅娟;;蘭州市大氣沉降塵中正構(gòu)烷烴分布及環(huán)境意義[J];環(huán)境科學(xué)與技術(shù);2009年02期

7 張淑紅;楊廣禮;梁峰;;商丘市包河沉積物中正構(gòu)烷烴的分析[J];環(huán)境保護(hù)科學(xué);2010年05期

8 劉剛;李久海;徐慧;吳丹;;麥草及其煙塵中正構(gòu)烷烴的組成[J];環(huán)境科學(xué);2013年11期

9 鄭金樹,張珞平,J.G.奎恩;廈門港重油污染源的脲重結(jié)晶正構(gòu)烷烴指紋鑒別[J];海洋環(huán)境科學(xué);1990年04期

10 陳偉琪,張珞平;正構(gòu)烷烴氣相色譜指紋法鑒別海面溢油源一事例研究[J];臺(tái)灣海峽;2002年03期

相關(guān)會(huì)議論文 前2條

1 孫菲;馬啟敏;;風(fēng)化過程對(duì)船舶燃料油組分及其指紋特征的影響研究[A];2013中國環(huán)境科學(xué)學(xué)會(huì)學(xué)術(shù)年會(huì)論文集（第八卷）[C];2013年

2 李勝勇;李先國;鄧偉;唐旭利;;南黃海表層沉積物正構(gòu)烷烴的分布特征及來源研究[A];2012中國環(huán)境科學(xué)學(xué)會(huì)學(xué)術(shù)年會(huì)論文集（第二卷）[C];2012年

相關(guān)博士學(xué)位論文 前1條

1 劉曉秋;吉林省主要類型土壤中正構(gòu)烷烴分布特征及其意義[D];吉林大學(xué);2013年

相關(guān)碩士學(xué)位論文 前10條

1 楊元策;內(nèi)蒙古高砷含水層沉積物有機(jī)質(zhì)特征研究[D];中國地質(zhì)大學(xué)(北京);2015年

2 王亞會(huì);燃料油和原油混合油種正構(gòu)烷烴分布特性的研究[D];大連海事大學(xué);2016年

3 吳明哲;藏北地區(qū)近百年間鈣華沉積物中正構(gòu)烷烴及多環(huán)芳烴大氣沉降變化[D];中國地質(zhì)大學(xué)(北京);2016年

4 符崇W，

本文編號(hào)：2114839