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        豆科綠肥對(duì)幼齡膠園土壤養(yǎng)分及葉片氮含量的影響及作用路徑分析

        2025-07-09 00:00:00張婧旻李彩蘭薛欣欣吳曉霜羅雪華王禹張永發(fā)任常琦趙春梅王文斌
        熱帶作物學(xué)報(bào) 2025年6期

        摘""要:為明確不同豆科綠肥在幼齡膠園土壤改良效果及橡膠樹氮素吸收的影響,本研究選取柱花草、葛藤和山毛豆3種豆科綠肥進(jìn)行間作種植,分析其對(duì)土壤養(yǎng)分的影響作用;采用15N自然豐度(δ15N)和偏最小二乘路徑分析(PLS-PM),解析綠肥對(duì)土壤氮含量及橡膠樹葉片氮素吸收的影響路徑。結(jié)果表明:與自然生草對(duì)照相比,葛藤和柱花草處理顯著提高土壤堿解氮含量,增幅分別為30.54%和31.25%,但速效鉀含量降低8.40%和6.87%;葛藤處理對(duì)土壤有機(jī)質(zhì)和有效磷含量的提升效果最為明顯,增幅分別為12.60%和30.94%。柱花草處理對(duì)橡膠樹葉片全氮含量的提升效果相對(duì)較高(增幅為25.86%)。相關(guān)性分析和偏最小二乘路徑分析進(jìn)一步表明,豆科綠肥與土壤堿解氮和全氮含量呈顯著正相關(guān),且具有顯著正向效應(yīng)。綜上所述,在本研究條件下,豆科綠肥主要通過提高土壤堿解氮含量來促進(jìn)橡膠樹葉片對(duì)氮素的吸收和積累。因此,在幼齡膠園管理中,合理選擇或混種豆科綠肥,可提升土壤和橡膠樹氮含量,有利于實(shí)現(xiàn)膠園生態(tài)系統(tǒng)的可持續(xù)生產(chǎn)。

        關(guān)鍵詞:綠肥;橡膠樹;土壤養(yǎng)分;氮含量;15N自然豐度中圖分類號(hào):S794.1;S714.8""""""文獻(xiàn)標(biāo)志碼:A

        Influence"of"Soil""Nutrients"and"Leaf"Nitrogen"Content"in"Young"Rubber"Plantations"Intercropped"with"Different"Leguminous"Green"Manures:"A"Pathway"Analysis

        ZHANG"Jingmin1,"LI"Cailan2,"XUE"Xinxin1*,"WU"Xiaoshuang1,"LUO"Xuehua1,"WANG"Yu1,"ZHANG"Yongfa1,"REN"Changqi1,"ZHAO"Chunmei1,"WANG"Wenbin1*

        1."Rubber"Research"Institute,"Chinese"Academy"of"Tropical"Agriculture"Sciences"/"Soil"and"Fertilizer"Research"Center,"Chinese"Academy"of"Tropical"Agricultural"Sciences"/"Key"Laboratory"of"Biology"and"Genetic"Resources"of"Rubber"Tree,"Ministry"of"Agriculture"and"Rural"Affairs"/"State"Key"Laboratory"Incubation"Base"for"Cultivation"amp;"Physiology"of"Tropical"Crops,"Haikou,"Hainan"571101,"China;"2."College"of"Tropical"Crops,"Yunnan"Agricultural"University,"Pu’er,"Yunnan"665099,"China

        Abstract:"Stylosanthes"guianensis,"Pueraria"phaseoloides,"and"Tephrosia"candida"were"selected"to"investigate"the"impact"mechanisms"of"green"manures"on"soil"physicochemical"properties"and"nitrogen"content"in"rubber"tree"leaves,"through"the"analysis"of"natural"abundance"of"15N"(δ15N)"and"partial"least"squares"path"analysis"(PLS-PM)"to"elucidate"the"effects"of"different"leguminous"green"manures"on"soil"improvement"and"nitrogen"uptake"in"young"rubber"plantations."Results"showed"that"P."phaseoloides"and"S.guianensis"treatments"significantly"increased"soil"alkaline"nitrogen"by"30.54%"and"31.25%,"respectively,"while"reducing"available"potassium"by"8.40%"and"6.87%,"compared"to"natural"grass"cover."P."phaseoloides"treatment"had"the"strongest"effect"on"increasing"soil"organic"matter"and"available"phosphorus"content,"with"increases"of"12.60%"and"30.94%,"respectively."S."guianensis"treatment"had"the"strongest"effect"on"increasing"the"total"nitrogen"content"in"rubber"trees"leaves"(an"increase"of"25.86%)."Correlation"analysis"and"PLS-PM"indicated"a"significant"positive"correlation"between"leguminous"green"manures"and"soil"alkaline"nitrogen"and"total"nitrogen"content,"with"a"significant"positive"effect."In"conclusion,"under"the"conditions"of"this"study,"leguminous"green"manures"promoted"the"absorption"and"accumulation"of"nitrogen"in"rubber"tree"leaves"by"increasing"soil"alkaline"nitrogen"content."The"rational"selection"or"mixed"planting"of"leguminous"green"manures"can"improve"the"nutrient"absorption"efficiency"of"rubber"trees"and"contribute"to"the"sustainable"production"of"rubber"plantations.

        Keywords:"green"manure;"rubber"tree;"soil"nutrients;"nitrogen"content;"15N"natural"abundance

        DOI:"10.3969/j.issn.1000-2561.2025.06.008

        天然橡膠作為國家重要的戰(zhàn)略物資和熱帶地區(qū)農(nóng)業(yè)經(jīng)濟(jì)的支柱產(chǎn)業(yè),其可持續(xù)生產(chǎn)對(duì)保障國家經(jīng)濟(jì)安全具有重要意義[1]。橡膠樹(Hevea"brasiliensis"Muell."Arg.)是天然橡膠的主要來源,其生長和產(chǎn)量不僅取決于遺傳特性,更與土壤肥力狀況和養(yǎng)分管理水平密切相關(guān)[2-4]。在眾多營養(yǎng)元素中,氮素作為植物生長發(fā)育的關(guān)鍵限制因子,對(duì)橡膠樹的生物量積累和膠乳合成具有顯著的調(diào)控作用[5-6]。特別是在幼齡膠園階段,由于橡膠樹根系尚未完全發(fā)育,其養(yǎng)分吸收能力相對(duì)有限,這使得土壤改良措施的實(shí)施尤為重要。

        種植豆科綠肥作為一種環(huán)境友好型的土壤改良措施,在農(nóng)業(yè)生態(tài)系統(tǒng)中的應(yīng)用價(jià)值日益凸顯[7-9]。其獨(dú)特的生物固氮能力不僅能夠提高土壤氮素含量,還能通過根系分泌和殘?bào)w分解等途徑改善土壤理化性質(zhì)[10-11]。在膠園生態(tài)系統(tǒng)中,間作豆科綠肥能夠有效促進(jìn)橡膠樹根系發(fā)育,提高土壤有機(jī)質(zhì)和有效氮含量[12]。已有研究顯示,膠園-柱花草間作系統(tǒng)可顯著增加土壤全氮和堿解氮含量[13],間種葛藤可調(diào)節(jié)土壤酸堿度,提高土壤肥力[14-16]。然而,現(xiàn)有研究多集中于單一豆科綠肥品種的效應(yīng)評(píng)估,對(duì)不同豆科綠肥的作用機(jī)制缺乏系統(tǒng)性比較。特別是豆科綠肥影響幼齡膠園“土壤—植物”系統(tǒng)氮素循環(huán)的作用路徑尚不完全清楚。

        基于此,本研究選取柱花草、葛藤和山毛豆3種典型豆科綠肥,利用15N自然豐度(δ15N)和偏最小二乘路徑分析,系統(tǒng)分析不同豆科綠肥對(duì)土壤養(yǎng)分和橡膠樹葉片氮含量的影響及其作用路徑,評(píng)估其在膠園土壤改良中的潛力,旨在為膠園土壤改良和綠色可持續(xù)發(fā)展提供理論依據(jù)。

        1""材料與方法

        1.1""試驗(yàn)地概況

        試驗(yàn)在海南省儋州市中國熱帶農(nóng)業(yè)科學(xué)院試驗(yàn)場紅城隊(duì)進(jìn)行。該地區(qū)屬于典型的熱帶海洋性季風(fēng)氣候,年均氣溫21.5~28.5"℃,年均日照時(shí)數(shù)2100"h,年均降水量約1600"mm,其中7—9月的降雨量占全年總降雨量的70%。試驗(yàn)地為幼齡膠園,于2021年11月開墾定植,種植材料為一年生的熱研917芽接苗,株行距為3.0"m×7.0"m,橡膠樹種植后下一年進(jìn)行綠肥種植田間試驗(yàn)。土壤類型為花崗巖發(fā)育的磚紅壤。

        1.2""方法

        1.2.1""試驗(yàn)設(shè)計(jì)""本研究采用隨機(jī)區(qū)組設(shè)計(jì),共設(shè)置4個(gè)處理,分別為:(1)自然生草(CK);(2)葛藤;(3)山毛豆;(4)柱花草。每個(gè)處理小區(qū)面積均為150"m2,并進(jìn)行3次重復(fù)。綠肥于2022年5月播種,生長期間,試驗(yàn)區(qū)域不施用肥料,以模擬自然生長條件。綠肥種植采用穴播法,葛藤播種密度為20"cm×30"cm,播種量為20"kg/hm2;山毛豆播種密度為20"cm×30"cm,播種量為30"kg/hm2;柱花草播種密度為40"cm×40"cm,播種量為15"kg/hm2。綠肥出苗后1個(gè)月,所有處理均進(jìn)行人工去除雜草,之后在綠肥覆蓋的情況下無需再進(jìn)行除草。自然生草區(qū)則每2個(gè)月進(jìn)行一次人工控萌。

        1.2.2""樣品采集與指標(biāo)測定""(1)樣品采集。于橡膠樹落葉時(shí)期(2024年1月),在每個(gè)試驗(yàn)小區(qū)內(nèi)隨機(jī)取3個(gè)1"m×1"m的樣方,分別采集3種綠肥和自然生草樣品。所有樣品經(jīng)烘干粉碎后,測定其全氮和δ15N自然豐度。同時(shí),使用土鉆采集與綠肥樣方對(duì)應(yīng)的土樣,將0~20"cm土層的樣品充分混勻后裝入密封袋。去除混合土樣中的石塊、根系等雜物后,將土樣風(fēng)干、研磨,并過1"mm篩,用于測定土壤的基本理化性質(zhì)。此外,選取與綠肥小區(qū)對(duì)應(yīng)的橡膠樹,采集其樹上尚未掉落的葉片樣品,用于測定橡膠樹葉片全氮和δ15N自然豐度。

        (2)指標(biāo)測定。土壤pH采用土水質(zhì)量比為1∶5的電位法測定,有機(jī)質(zhì)采用重鉻酸鉀外加熱法測定,堿解氮采用堿解蒸餾法測定,速效磷采用NH4F-HCl浸提-連續(xù)流動(dòng)分析儀法測定,速效鉀采用乙酸銨浸提-火焰光度法測定。

        土壤和植物樣品中全氮含量及15N自然豐度(δ15N)釆用元素分析儀(Thermo"Flash"EA1112)-穩(wěn)定性同位素質(zhì)譜聯(lián)用儀(GV"IsoPrime"JB312)測定。δ15N的計(jì)算式:

        1.3""數(shù)據(jù)處理

        采用SPSS"26.0軟件單因素方差分析顯著性;利用Origin"Pro"2022軟件進(jìn)行數(shù)據(jù)繪制,并對(duì)綠

        肥和橡膠葉片氮含量與土壤理化性質(zhì)進(jìn)行相關(guān)性分析;利用R語言的“PLS-PM包”分析豆科綠肥通過改變土壤氮含量,進(jìn)而影響幼齡橡膠樹葉片氮含量的作用路徑。

        2""結(jié)果與分析

        2.1""不同綠肥對(duì)膠園土壤理化性質(zhì)的影響

        如表1所示,與對(duì)照相比,柱花草、葛藤和山毛豆處理均對(duì)土壤養(yǎng)分含量產(chǎn)生了明顯影響。柱花草和葛藤處理顯著提高了土壤堿解氮含量,分別增加30.54%和31.25%;土壤有機(jī)質(zhì)和有效磷含量在各綠肥處理下較對(duì)照均有所提高,其中葛藤處理的提升幅度最為明顯,分別增加12.60%和30.94%。柱花草和葛藤處理的速效鉀含量較對(duì)照分別降低8.40%和6.87%,而山毛豆處理速效鉀含量則較對(duì)照增加29.01%。此外,不同綠肥處理下土壤pH呈現(xiàn)下降趨勢,但各處理較對(duì)照差異不顯著。與對(duì)照相比,柱花草、葛藤和山毛豆處理的pH分別降低5.58%、1.46%和3.00%。

        2.2""不同綠肥對(duì)膠園土壤全氮和碳氮比(C/N)的影響

        不同綠肥處理均在一定程度上提高了土壤全氮含量(圖1A)。與對(duì)照相比,葛藤處理的土壤全氮含量顯著增加13.91%,柱花草和山毛豆處理的土壤全氮含量分別增加2.61%和4.78%。在土壤碳氮比方面(圖1B),柱花草處理的土壤碳氮比較對(duì)照增加1.38%,而葛藤和山毛豆處理的土壤碳氮比分別下降1.24%和3.32%,但各綠肥處理之間的差異均不顯著。

        2.3""不同綠肥對(duì)橡膠葉片氮含量的影響

        如圖2A所示,各綠肥處理的全氮含量較對(duì)照均有不同程度的提升,分別增加16.21倍、0.45倍和0.69倍。其中,葛藤處理的全氮含量顯著高于對(duì)照,且較柱花草和山毛豆處理分別增加10.84倍和9.18倍,但3種處理間差異不顯著。在橡膠樹葉片全氮含量方面(圖2B),與對(duì)照相比,柱花草、葛藤和山毛豆處理均對(duì)橡膠樹葉片全氮含量產(chǎn)生了積極影響,分別增加25.86%、16.28%和18.06%。

        2.4""不同綠肥對(duì)橡膠葉片及土壤δ15N值的影響

        如圖3A所示,各綠肥處理的綠肥15N自然豐度(δ15N)存在顯著差異。與對(duì)照相比,柱花草、葛藤和山毛豆處理的δ15N值分別顯著降低2.90倍、2.74倍和2.26倍。其中,柱花草處理的δ15N值明顯低于葛藤和山毛豆處理,分別降低8.48%和33.90%。在橡膠葉片δ15N值方面(圖3B),葛藤處理的橡膠葉片δ15N值顯著高于柱花草和山毛豆處理,分別增加146.31%和85.37%;而柱花草處理的橡膠葉片δ15N值則顯著低于對(duì)照、葛藤和山毛豆處理,分別降低2.63倍、3.16倍和1.32倍。不同綠肥處理的土壤δ15N值均有明顯提升(圖3C),其中,山毛豆處理土壤δ15N值較對(duì)照顯著增加了1.01倍。

        2.5""綠肥氮含量與膠園土壤理化性質(zhì)、葉片氮含量的相關(guān)性

        圖4相關(guān)性分析顯示,綠肥全氮與土壤全氮、有機(jī)質(zhì)含量呈顯著正相關(guān)。綠肥δ15N值與土壤堿解氮含量呈極顯著正相關(guān)。橡膠葉片δ15N值與土壤全氮含量呈顯著正相關(guān)。在土壤理化性質(zhì)方面,有機(jī)質(zhì)與堿解氮、土壤全氮分別呈顯著正相關(guān)和極顯著正相關(guān)(Plt;0.001);土壤δ15N值與堿解氮、有效磷含量均呈顯著正相關(guān)。

        2.6""綠肥對(duì)膠園土壤和葉片氮含量的作用路徑

        偏最小二乘路徑模型分析結(jié)果顯示(圖5),綠肥氮含量對(duì)土壤氮含量的直接影響路徑系數(shù)為0.700,而通過影響土壤堿解氮含量和δ15N值的間接影響路徑系數(shù)均為0.719。此外,綠肥氮含量對(duì)橡膠葉片氮含量具有極顯著正效應(yīng),直接和間接影響的路徑系數(shù)分別為0.8727和0.0209。

        3""討論

        3.1""綠肥對(duì)幼齡膠園土壤養(yǎng)分影響及作用路徑

        種植豆科綠肥是農(nóng)業(yè)生態(tài)系統(tǒng)中改善土壤質(zhì)量和提升養(yǎng)分有效性的重要措施[15-16]。本研究結(jié)果表明,與自然生草對(duì)照處理相比,豆科綠肥處理使土壤全氮含量增加2.61%~13.91%,柱花草和葛藤處理顯著提高土壤堿解氮含量,分別增加30.54%和31.25%。這一結(jié)果與朱亞瓊等[8]的田間試驗(yàn)研究一致,表明豆科綠肥在促進(jìn)土壤氮積累方面的積極作用。豆科植物通過與根瘤菌形成共生固氮體系,將大氣中的氮?dú)廪D(zhuǎn)化為植物可利用的氮素形態(tài),這一過程不僅直接增加了土壤氮庫,還通過加速礦質(zhì)養(yǎng)分的釋放來增強(qiáng)土壤的供氮能力[7,"16]。不同豆科植物在固氮能力上存在種間差異,這可能與根瘤菌的宿主特異性、固氮酶活性及環(huán)境適應(yīng)性等因素有關(guān)[17-19]。其中,葛藤作為多年生藤本植物,其快速生長特性和廣泛的覆蓋面積,能夠?yàn)橥寥捞峁┐罅坑袡C(jī)殘?bào)w和氮源[16-17,"20]。這種持續(xù)的有機(jī)質(zhì)輸入促進(jìn)了固氮微生物群落的繁殖,還加速了氮素的礦化過程[21]。

        偏最小二乘路徑模型結(jié)果顯示,綠肥通過影響土壤氮含量調(diào)控土壤氮庫。這與王桂花等[17]研究結(jié)果相互印證,他們發(fā)現(xiàn)橡膠園間作葛藤可顯著提高0~20"cm土層全氮含量,并促進(jìn)氮素在植物-土壤系統(tǒng)中的循環(huán)。豆科植物的生物固氮作用使植物呈現(xiàn)較低的δ15N值[22]。而微生物在有機(jī)質(zhì)分解過程中優(yōu)先利用14N,導(dǎo)致殘留物中15N富集[23]。這解釋了本研究中豆科綠肥δ15N值的動(dòng)態(tài)變化特征。豆科植物的生物固氮作用為土壤-植物系統(tǒng)提供了氮源,而橡膠樹的氮素吸收則驅(qū)動(dòng)了土壤氮庫的周轉(zhuǎn)。這種相互作用不僅影響了系統(tǒng)的氮素平衡,也通過同位素分餾效應(yīng)改變了土壤-植物系統(tǒng)中不同氮庫δ15N值的分布特征[24-27]。

        此外,豆科綠肥處理使土壤速效鉀含量降低6.87%~8.40%,這可能是因?yàn)槎箍凭G肥在快速生長期間對(duì)鉀素的需求量較大,導(dǎo)致土壤中速效鉀的消耗[21],在實(shí)際應(yīng)用豆科綠肥時(shí)應(yīng)注重鉀素的平衡管理。在土壤有機(jī)質(zhì)和磷素方面,豆科綠肥表現(xiàn)出積極的改良效果。葛藤處理使土壤有機(jī)質(zhì)和有效磷含量分別增加12.60%和30.94%,這與吳志祥等[28]在幼齡膠園的研究結(jié)果一致。豆科綠肥的根系分泌物和殘?bào)w分解為土壤微生物提供豐富的碳源,促進(jìn)微生物群落的生長和代謝活動(dòng)[28-29]。同時(shí),微生物的分解作用進(jìn)一步釋放土壤中的礦質(zhì)養(yǎng)分,形成良性的養(yǎng)分循環(huán)[30-31]。這種正向反饋機(jī)制不僅提高土壤肥力水平,還增強(qiáng)土壤生態(tài)系統(tǒng)的穩(wěn)定性和可持續(xù)性。

        3.2""綠肥對(duì)幼齡橡膠樹葉片氮含量影響及作用路徑

        海南橡膠樹多分布于高溫多雨的熱帶氣候區(qū),強(qiáng)烈的礦物風(fēng)化和有機(jī)質(zhì)分解作用導(dǎo)致土壤氮素含量普遍偏低[32-33]。綠肥處理對(duì)橡膠葉片氮素含量產(chǎn)生了積極影響。與對(duì)照處理相比,不同綠肥處理均提高了橡膠樹葉片全氮含量,其中柱花草處理的效果最為突出,增幅達(dá)25.86%。王桂花等[17]研究結(jié)果也發(fā)現(xiàn),橡膠-柱花草間作系統(tǒng)中橡膠樹的植株氮含量顯著高于單一種植橡膠樹處理。這表明柱花草不僅能夠通過生物固氮作用增加土壤氮庫,還能有效促進(jìn)橡膠樹對(duì)氮素的吸收和利用。這與綠肥處理對(duì)土壤氮含量的增加趨勢相同,豆科綠肥可能是通過生物固氮作用,提高土壤中可供植物吸收的氮素含量,促進(jìn)橡膠樹葉片氮素含量的增加[16,"34-35]。偏最小二乘路徑模型結(jié)果進(jìn)一步揭示了豆科綠肥影響橡膠樹葉片氮素含量的作用路徑,綠肥通過直接增加土壤中的有效氮含量,進(jìn)而影響橡膠樹的氮素營養(yǎng)。然而,盡管綠肥顯著提高了土壤全氮含量,其對(duì)橡膠葉片氮素含量的提升幅度相對(duì)有限。這種差異可能與橡膠樹作為多年生喬木的特性有關(guān):其養(yǎng)分吸收和分配過程容易受到物候期、氣候條件以及樹齡等因素的影響[2-3,"35]。在后期的試驗(yàn)中,還需通過采集全年樣品進(jìn)行測定與評(píng)估,并在較長時(shí)間尺度上進(jìn)行試驗(yàn),收集分析數(shù)據(jù),以更準(zhǔn)確地分析綠肥對(duì)橡膠樹葉片氮素含量的效應(yīng)。

        4""結(jié)論

        3種豆科綠肥均能夠提高土壤氮素含量并促進(jìn)橡膠樹葉片氮素吸收,但效果存在顯著種間差異。柱花草在促進(jìn)橡膠樹氮素吸收和提升土壤氮素含量方面表現(xiàn)最為突出。葛藤則在改善土壤堿解氮、有機(jī)質(zhì)和有效磷含量方面效果顯著,而山毛豆對(duì)氮素的提升效果相對(duì)有限。合理選擇或混種豆科綠肥,有助于構(gòu)建高效的膠園養(yǎng)分循環(huán)體系,推動(dòng)橡膠產(chǎn)業(yè)的綠色可持續(xù)發(fā)展。

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