本文選題：二氧化碳逸出通量　切入點(diǎn)：時(shí)空變化　出處：《生態(tài)學(xué)報(bào)》2017年22期

【摘要】：河流連接著海洋碳庫和陸地碳庫,河流碳逸出是全球碳收支的重要組成部分。本文以黃河上游和中游分界點(diǎn)—內(nèi)蒙古段頭道拐斷面為研究對象,采用Li-7000靜態(tài)箱法監(jiān)測了斷面4個(gè)采樣點(diǎn)在2013—2015年期間四季的CO_2逸出通量(FCO_2),并分析了FCO_2時(shí)空變化規(guī)律�；谘芯繑嗝嬷饕暮退瘜W(xué)指標(biāo)的野外監(jiān)測和室內(nèi)分析結(jié)果,探討了FCO_2的主要影響因素。結(jié)果表明斷面FCO_2介于14—186 mol m~(-2)a~(-1),平均值為84 mol m~(-2)a~(-1);水體CO_2分壓(p CO_2)介于467—2101μatm,平均值為995μatm;DOC濃度介于2.7—13 mg/L。FCO_2季節(jié)性差異明顯:夏季FCO_2為全年最大456 mmol m~(-2)d~(-1),冬季最小33 mmol m~(-2)d~(-1)。FCO_2在4個(gè)采樣點(diǎn)的空間差異顯著:河道右岸S4點(diǎn)處最大為392 mmol m~(-2)d~(-1);河道中部S2和S3點(diǎn)基本相同;河道左岸S1點(diǎn)最小為86 mmol m~(-2)d~(-1)。FCO_2與河道流速呈現(xiàn)較好的正相關(guān)關(guān)系,與p CO_2中等相關(guān),與p H負(fù)相關(guān),與風(fēng)速的相關(guān)性不明顯,說明對于該研究斷面河道流速較p CO_2對FCO_2的貢獻(xiàn)更大。本研究較為精細(xì)地探討了頭道拐斷面的水體CO_2逸出規(guī)律,表明即使在同一河道斷面,FCO_2也可能存在較大空間差異,流速較大處的FCO_2較大,因此在野外監(jiān)測FCO_2時(shí)需要在河道斷面選取具有代表性的采樣點(diǎn),特別是較大的河流。研究結(jié)果為黃河中上游CO_2逸出量評價(jià)和河道斷面FCO_2監(jiān)測點(diǎn)的布設(shè)提供了科學(xué)依據(jù)。
[Abstract]:Rivers are connected to marine and terrestrial carbon reservoirs, and river carbon emission is an important part of global carbon budget. This paper studies the section of the head of Inner Mongolia section, which is the boundary point of the upper and middle reaches of the Yellow River. The Li-7000 static box method was used to monitor the CO_2 emission flux of four sampling sites in the four seasons of 2013-2015, and the temporal and spatial variation of FCO_2 was analyzed. Based on the field monitoring and indoor analysis results of the main hydrological and hydrochemical indexes of the section, The main influencing factors of FCO_2 are discussed. The results show that the cross section FCO_2 is between 14 and 186 mol / m ~ (-1) with an average value of 84 mol / m ~ (-1), and the partial pressure of water CO_2 / CO _ 2 is between 467-2101 渭 atm and the mean value is 995 渭 / m ~ (DOC) between 2.7-13 mg/L.FCO_2, and summer FCO_2 is the maximum mg/L.FCO_2 value of 456#en7# in the whole year. The spatial difference of minimum 33 mmol m~(-2)d~(-1).FCO_2 in winter at 4 sampling sites is significant: the maximum value at S4 point on the right bank of the river is 392 mmol / m ~ (-1), and the S _ 2 and S _ 3 points in the middle of the channel are basically the same. The minimum S1 point on the left bank of the river is 86 mmol m~(-2)d~(-1).FCO_2, which has a good positive correlation with the channel velocity, a moderate correlation with p CO_2, a negative correlation with pH, and no significant correlation with the wind speed. The results show that the channel velocity of the study section is more important to FCO_2 than p CO_2. In this study, the escape law of CO_2 in the water body of the head road section is discussed in detail, which indicates that there may be great spatial differences even in the same section of the river channel. The FCO_2 where the velocity is higher is larger, so it is necessary to select representative sampling points in the channel section when monitoring FCO_2 in the field. The results of the study provide scientific basis for the evaluation of CO_2 emission in the upper and middle reaches of the Yellow River and the layout of FCO_2 monitoring points for river sections.
【作者單位】： 內(nèi)蒙古大學(xué)生態(tài)與環(huán)境學(xué)院;新加坡國立大學(xué);
【基金】：國家自然科學(xué)基金(91547110,51469018) 水利部公益性行業(yè)科研專項(xiàng)(20150104)
【分類號】：P332;P343.1

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