周琦 王金鳳 徐永勤 夏淑芳 沈鳳強(qiáng) 徐盧雨 陳卓梅
摘?要:采用動(dòng)態(tài)頂空采集法和熱脫附-氣質(zhì)聯(lián)用技術(shù),對(duì)不同季節(jié)和一天內(nèi)不同時(shí)間點(diǎn)樟樹(shù)葉片釋放的揮發(fā)性有機(jī)物(VOCs)成分含量及其變化規(guī)律進(jìn)行了分析。結(jié)果表明:全年樟樹(shù)葉片釋放的VOCs共計(jì)78種,其中萜烯類(19種)和烷烴類(18種)化合物種類較多;32種樟樹(shù)葉片釋放的揮發(fā)性成分相對(duì)含量在不同季節(jié)存在顯著差異(P<0.05);3月份釋放的VOCs種類最為豐富,萜烯類化合物相對(duì)含量最高(43.49%),主要為1-石竹烯、D-檸檬烯和α-蒎烯,其他月份釋放的VOCs則以烷烴類和醇類為主;春季,樟樹(shù)葉片在絕大多數(shù)時(shí)間點(diǎn)釋放VOCs以萜烯類化合物為主,且早上8:00釋放的萜烯類化合物相對(duì)含量最大。綜上結(jié)果認(rèn)為,樟樹(shù)是營(yíng)造保健型生態(tài)園林的理想樹(shù)種,其葉片釋放的VOCs中富含多種對(duì)人體健康有益的萜烯類化合物,春季的早晨是進(jìn)行森林康養(yǎng)活動(dòng)的最佳時(shí)間。
關(guān)鍵詞:樟樹(shù),葉片,揮發(fā)性有機(jī)物,季節(jié)動(dòng)態(tài),日動(dòng)態(tài)
中圖分類號(hào):Q945
文獻(xiàn)標(biāo)識(shí)碼:A
文章編號(hào):1000-3142(2020)07-1021-12
Abstract:Volatile?organic?compounds?(VOCs)?were?collected?in?different?seasons?and?different?times?of?the?day?by?dynamic?headspace?air-circulation?method,and?the?relative?contents?and?the?change?laws?were?also?analyzed?using?the?thermal?desorption?system?gas?chromatography/mass?spectrum?(GC-MS).?The?results?were?as?follows:Cinnamomum?camphora?leaves?released?78?types?of?VOCs?during?the?whole?year,and?the?types?of?terpenes?(19)?and?alkanes?(18)?were?more?abundant?than?those?of?other?compounds;?The?relative?contents?of?32?types?of?VOCs?had?significant?differences?(P<0.05)?among?different?seasons;?The?number?of?types?in?March?was?the?most?abundant,and?the?relative?contents?of?terpenes?reached?43.49%,including?1-Caryophyllene,D-Limonene?and?α-pinene,and?the?types?of?VOCs?released?from?C.?camphora?leaves?in?other?months?were?mainly?of?alkanes?and?alcohols;?In?spring,the?relative?contents?of?VOCs?released?at?most?of?the?time?were?all?mainly?of?terpenes,and?the?relative?contents?of?terpenes?released?at?8:00?am?were?the?highest.?Therefore,C.?camphora?is?an?ideal?species?for?ecological?and?heathy?landscape,and?the?VOCs?released?from?C.?camphora?leaves?are?rich?in?kinds?of?terpenes?compounds,which?are?beneficial?for?human?health,and?spring?and?morning?are?the?best?time?for?forest?recreation.
Key?words:Cinnamomum?camphora,leaves,volatile?organic?compounds(VOCs),seasonal?change,diurnal?change
植物揮發(fā)性有機(jī)物(volatile?organic?compounds,VOCs)是一種由植物次生代謝產(chǎn)生,且在常溫下主要以液態(tài)形式存在的有機(jī)物質(zhì)(陳洪偉等,2001;陳靜,2016)。不同植物的合成與釋放部位有所不同,對(duì)于絕大多數(shù)開(kāi)花植物而言,花釋放出VOCs的量最大、種類最為豐富(Knudsen?et?al.,2006),營(yíng)養(yǎng)組織(如葉和莖)是針葉樹(shù)、草本植物的VOCs主要來(lái)源(McConkey?et?al.,2000;?Vasso?et?al.,2006)。自然界中的VOCs組成十分豐富,種類在10?000種以上(楊小琴,2006),按結(jié)構(gòu)特點(diǎn)大致可分為萜烯類、烷烴類、芳香烴類、醛類、酮類、醇類、酯類、有機(jī)酸類和其他類型(Atkinson?&?Arey,2003;?Chen?&?Cao,2005)。這些植物源VOCs不僅具有吸引傳粉者(Raguso,2008)、防御天敵(Degenhardt?et?al.,2009;?Unsicker?et?al.,2009;?Ali?et?al.,2012)、殺菌抑菌(Huang?et?al.,2012)、抵御非生物脅迫(Dudareva?et?al.,2006;?Vickers?et?al.,2009)、促進(jìn)植物間信息交流(Cojocariu?et?al.,2004;Baldwin?et?al.,2006)、改變大氣組成(洪蓉,2002;Kaplan?et?al.,2006;?Bao?et?al.,2010)等重要生物生態(tài)學(xué)作用,而且具有緩解疲勞、強(qiáng)身健體(房城等,2010;Zhang?et?al.,2015)、調(diào)節(jié)精神(Cruz-López?et?al.,2001;佟棽棽和姚雷,2009;?Papiez?et?al.,2009)等保健作用。此外,一些VOCs會(huì)對(duì)環(huán)境造成一定負(fù)面影響(Renner?&?Münzenberg,2003)。由于溫度、濕度、光照等環(huán)境因子以及植物自身的生理狀態(tài)均會(huì)對(duì)部分VOCs釋放產(chǎn)生影響,使得植物源VOCs的釋放具有較強(qiáng)的季節(jié)和日變化動(dòng)態(tài)性(Padhy?&?Varshney,2005;鄧小勇,2009)。深入研究植物VOCs釋放特征和變化規(guī)律,可為大氣環(huán)境質(zhì)量預(yù)報(bào)提供科學(xué)的參考數(shù)據(jù),對(duì)合理的園林植物配置及其保健效果的預(yù)測(cè)具有重要意義。
樟樹(shù)(Cinnamomum?camphora)是樟科(Lauraceae)樟屬(Cinnamomum)常綠喬木,為亞熱帶常綠闊葉林的代表樹(shù)種;其枝葉繁茂,樹(shù)冠廣展,是優(yōu)良的綠化樹(shù)、行道樹(shù)、庭蔭樹(shù)及保健樹(shù)(李勇鵬等,2015)。樟樹(shù)各部位均具有不同的應(yīng)用價(jià)值,木材、根、枝、葉可提取樟腦和樟油,用于醫(yī)療與香料工業(yè);果核富含的天然色素和精油可供紡織品染色等工業(yè)用;同時(shí),根、果、枝和葉可入藥,有祛風(fēng)散寒、強(qiáng)心鎮(zhèn)痙和殺蟲(chóng)等功效。近些年,對(duì)樟樹(shù)的研究主要集中在組織培養(yǎng)快繁體系(杜麗,2005)、精油提取技術(shù)(黃婷,2016)、殺蟲(chóng)抑菌特性(Liu?et?al.,2006)、分子生物學(xué)(Yang?et?al.,2002;Kameyama,2012)等領(lǐng)域。作為含有大量具特殊香味有機(jī)物的樟樹(shù),吳楚材等(2006)和鄧小勇(2009)對(duì)其離體葉片釋放的VOCs成分進(jìn)行研究,任露潔等(2012)對(duì)以樟樹(shù)為主的典型群落中VOCs釋放日動(dòng)態(tài)進(jìn)行探究。然而,樟樹(shù)葉片VOCs釋放的季節(jié)動(dòng)態(tài)和日動(dòng)態(tài)變化可以為人們選擇適宜的季節(jié)和時(shí)間開(kāi)展森林康養(yǎng)提供依據(jù),但該部分的研究卻尚未見(jiàn)報(bào)道。本研究采用動(dòng)態(tài)頂空采集法對(duì)樟樹(shù)葉片不同季節(jié)和一天內(nèi)不同時(shí)間釋放的VOCs進(jìn)行采集,結(jié)合熱脫附-氣質(zhì)聯(lián)用技術(shù)對(duì)其組成和相對(duì)含量進(jìn)行檢測(cè)與分析,揭示樟樹(shù)葉片VOCs釋放的年動(dòng)態(tài)變化和日動(dòng)態(tài)變化規(guī)律,為合理利用樟樹(shù)的園林綠化與保健功能提供理論參考。
1?材料與方法
1.1?材料
試驗(yàn)樣地是浙江省杭州市余杭區(qū)國(guó)營(yíng)長(zhǎng)樂(lè)林場(chǎng)(119°50′?E、30°22′?N)。該林場(chǎng)位于浙江省杭州市,屬亞熱帶季風(fēng)氣候,全年平均氣溫15.8?℃,年降雨量1?350?mm,無(wú)霜期232?d。試驗(yàn)植株來(lái)自林場(chǎng)內(nèi)的天然樟樹(shù)林,生長(zhǎng)健康,無(wú)病蟲(chóng)害。
1.2?VOCs采集
分別在2017年3月、6月、9月和12月選擇晴朗無(wú)風(fēng)的天氣,于上午8:00—16:00間每2?h取一次樣,選擇同一位置生長(zhǎng)健康、枝葉繁茂且向陽(yáng)的枝條。利用ZC-Q便攜式雙泵大氣采樣器(浙江恒達(dá)),采用動(dòng)態(tài)頂空氣體循環(huán)采集法進(jìn)行樣品采集。采氣袋容積為0.1?m3,流量0.1?m3·min-1,采集時(shí)間為30?min,重復(fù)3次。同時(shí),每季節(jié)所取樣品中增加3個(gè)空白對(duì)照,不進(jìn)行VOCs采集,其他均為相同處理,用于校正本底影響。
1.3?VOCs成分測(cè)定
采用熱脫附-氣相色譜/質(zhì)譜聯(lián)用法(Thermo?Desorption?System/Gas?Chromatography/Mass?Spectirm,TDS-GC/MS)完成植物VOCs成分的測(cè)定。
色譜條件(7890A型,Agilent公司):HP-5MS彈性石英毛細(xì)管柱(30?m?×?250?μm?×?0.25?μm);載氣為高純氦氣;進(jìn)樣不分流;體積流量為1.0?mL·min-1;色譜柱初始溫度為40?℃,保持3?min,先以6?℃·min-1的速率升至112?℃,保持3?min,再依次以6?℃·min-1的速率升至250?℃和以10?℃·min-1的速率升至270?℃,保持5?min。
質(zhì)譜條件(5975A型,Agilent公司):電子轟擊(EI)離子源,電子能量為70?eV;掃描質(zhì)量數(shù)范圍為29~400?amu;離子源溫度為230?℃;接口溫度為280?℃;四級(jí)桿溫度為150?℃。
熱脫附條件(TD3型,德國(guó)Gerstel公司):系統(tǒng)載氣壓力20?kPa;進(jìn)樣口溫度250?℃;脫附溫度250?℃,保持10?min;冷阱溫度-100?℃,保持3?min;冷阱進(jìn)樣時(shí)溫度迅速升溫至260?℃。
1.4?數(shù)據(jù)分析
對(duì)于GC/MS分析所獲得的VOCs成分GC/MS原始數(shù)據(jù)總離子流圖(TIC),其各峰對(duì)應(yīng)的化學(xué)物質(zhì)信息利用Xcalibur?1.2軟件,經(jīng)檢索質(zhì)譜數(shù)據(jù)庫(kù)(NIST2008譜庫(kù))后,結(jié)合人工校對(duì)和解析,最終確定各VOCs成分。最后,采用面積歸一法計(jì)算各成分的相對(duì)含量。
相對(duì)含量=(某物質(zhì)峰面積/該物質(zhì)所在樣品中所有物質(zhì)的峰面積總和)×100%。
利用SPSS?22.0軟件對(duì)不同季節(jié)檢測(cè)到各成分相對(duì)含量進(jìn)行單因素方差分析和Duncan多重比較(P<0.05),未檢測(cè)到的成分分析時(shí)以0表示。方差分析前,先對(duì)數(shù)據(jù)進(jìn)行正態(tài)分布(Shapiro-Wilk?W?test)和方差齊性(Levenes?test)檢驗(yàn),對(duì)非正態(tài)的數(shù)據(jù)集進(jìn)行Z-score標(biāo)準(zhǔn)化。利用Excel?2013和Origin?8.5軟件完成圖表的繪制。
2?結(jié)果與分析
2.1?樟樹(shù)葉VOCs成分和相對(duì)含量的季節(jié)動(dòng)態(tài)變化
從樟樹(shù)葉片不同季節(jié)釋放的VOCs中鑒定出78種化合物(表1)。其中,檢測(cè)到的萜烯類和烷烴類化合物的種類最多,分別為19種、18種,共占檢測(cè)到所有化合物種類的47.44%;而檢測(cè)到的芳烴類、醛類、酮類、醇類、酯類、有機(jī)酸類和其他類化合物的種類為4~9種不等。各類化合物在不同季節(jié)的釋放情況有所不同,其中32種化合物在不同季節(jié)的相對(duì)釋放量存在顯著差異(P<0.05),烷烴類13種、萜烯類4種、芳烴類3種、醛類3種、酯類2種、酮類2種、醇類2種、有機(jī)酸類2種和其他類化合物1種。
對(duì)上述32種化合物的相對(duì)含量進(jìn)行Duncan多重比較,結(jié)果表明樟樹(shù)葉片所釋放的萜烯類化合物中,α-蒎烯、莰烯和樟腦在3月份的相對(duì)含量均顯著高于其他月份;L-薄荷醇僅在9月份檢測(cè)到,但相對(duì)含量較低(2.30%)。樟樹(shù)葉片的烷烴類化合物釋放量在不同季節(jié)間變化最大,共13種化合物的相對(duì)含量差異達(dá)到顯著水平;壬烷在12月份的相對(duì)含量顯著低于其他月份,癸烷在12月份的相對(duì)含量同樣顯著高于其他月份;2,2,4,4-四甲基辛烷和2,2,4,6,6-五甲基庚烷在6月和9月的相對(duì)含量顯著高于其他2個(gè)月份;此外,3月、9月和12月分別檢測(cè)到6種(2,4-二甲基庚烷、2,5-二甲基壬烷、4-甲基辛烷、4-甲基壬烷、2,6-二甲基壬烷、4-甲基癸烷)、2種(2,7,10-三甲基十二烷、3,5-二甲基辛烷)和1種(萘烷)特有的烷烴類化合物。芳烴類化合物在9月份的釋放量較為豐富,有3種芳烴類化合物(正丙苯、異丙苯、α-甲基苯乙烯)的相對(duì)含量顯著高于其他月份。同樣,樟樹(shù)葉片所釋放的3種醛類、2種酮類、2種醇類和1種其他類化合物在3月份的相對(duì)含量均要高于其他月份,且多數(shù)情況下達(dá)顯著水平。2種酯類化合物的相對(duì)含量則分別在3月(醋酸丁酯)、6月最高(磷酸三乙酯)。
各季節(jié)檢測(cè)到的樟樹(shù)葉片釋放的VOCs種類和相對(duì)含量變化情況如圖1所示。從圖1可以看出,4個(gè)季節(jié)釋放的VOCs種類均以萜烯類為主,其次是烷烴類。3月份檢測(cè)到的VOCs種類最多(54種),其中萜烯類化合物有17種,占種類總數(shù)的31.48%;6月、9月和12月分別檢測(cè)到27種、27種和25種VOCs,萜烯類化合物種類數(shù)分別占總數(shù)的25.93%(7種)、29.63%(8種)和20.00%(5種)。此外,3月份檢測(cè)到的烷烴類和酮類化合物種類明顯多于其他月份,其中酮類化合物在3月份共檢測(cè)到7種,而其他月份僅檢測(cè)到1種。
樟樹(shù)葉片釋放的各類VOCs相對(duì)含量的季節(jié)間變化規(guī)律與種類變化規(guī)律有所不同??傮w來(lái)看,3月—12月,萜烯類和酮類化合物的相對(duì)含量有降低趨勢(shì),醇類化合物的相對(duì)含量有升高趨勢(shì);烷烴類、芳烴類和其他類化合物的相對(duì)含量則總體呈先升高后降低的趨勢(shì),酯類和有機(jī)酸類化合物的相對(duì)含量則總體呈先降低后升高的趨勢(shì)。3月份的VOCs中相對(duì)含量最高的為萜烯類化合物,占總量的43.39%,遠(yuǎn)高于其他8類化合物,其主要物質(zhì)為1-石竹烯(11.66%)、α-蒎烯(10.70%)和D-檸檬烯(7.25%);其次是醇類和烷烴類化合物,分別占14.51%、11.99%。6月和9月檢測(cè)到的VOCs中,烷烴類化合物的相對(duì)含量均為當(dāng)月最高,分別為29.23%、36.35%,其主要化合物均為2,2,4,6,6-五甲基庚烷。12月檢測(cè)到的VOCs中,最高的為醇類化合物,占當(dāng)季節(jié)檢測(cè)到揮發(fā)物總量的37.41%,主要為2-乙基己醇(26.95%)和丁醇(10.46%)。
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