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      避雨設(shè)施葡萄對(duì)套種枇杷生長(zhǎng)與結(jié)果的影響

      2023-10-27 23:07:35許奇志鄧朝軍蔣際謀陳秀萍
      果樹(shù)學(xué)報(bào) 2023年10期
      關(guān)鍵詞:枇杷套種葡萄

      許奇志 鄧朝軍 蔣際謀 陳秀萍

      DOI:10.13925/j.cnki.gsxb.20230135

      摘? ? 要:【目的】分析比較避雨設(shè)施葡萄下微生態(tài)環(huán)境對(duì)套種枇杷生長(zhǎng)與結(jié)果的影響,為探討葡萄-枇杷套種模式提供依據(jù)?!痉椒ā吭?年生避雨設(shè)施葡萄下套種盆栽帶花蕾的新白8號(hào)枇杷3年生嫁接營(yíng)養(yǎng)袋大苗,以露地盆栽帶花蕾的新白8號(hào)枇杷3年生嫁接營(yíng)養(yǎng)袋大苗為對(duì)照,連續(xù)2 a(年)觀測(cè)比較枇杷樹(shù)體生長(zhǎng)發(fā)育和果實(shí)質(zhì)量差異?!窘Y(jié)果】避雨設(shè)施栽培葡萄的生長(zhǎng),使夏季(中午12:00)棚內(nèi)光照度降低了92.37%,溫度降低6.10 ℃,相對(duì)濕度提高20.87%;冬季棚內(nèi)溫度提高1.15~2.28 ℃。避雨設(shè)施葡萄下套種盆栽枇杷樹(shù)第2年的南北冠幅、樹(shù)高度、干周、葉幕層厚、枝梢數(shù)、枝梢質(zhì)量、葉片質(zhì)量顯著降低,花穗數(shù)、花穗大小顯著低于對(duì)照;單株產(chǎn)量是對(duì)照的69.67%,顯著低于對(duì)照;果穗質(zhì)量、單果質(zhì)量、可食率與對(duì)照差異不顯著;果實(shí)病蟲(chóng)害明顯減少,好果率提高12.89%~27.25%?!窘Y(jié)論】避雨設(shè)施葡萄下套種的枇杷可正常開(kāi)花結(jié)果,有一定產(chǎn)量,且果實(shí)病蟲(chóng)害減少,是一種可行的套種模式,但需進(jìn)一步研究適宜的配套栽培技術(shù),緩解避雨設(shè)施和葡萄生長(zhǎng)對(duì)套種枇杷生長(zhǎng)的蔭蔽影響。

      關(guān)鍵詞:葡萄;避雨設(shè)施栽培;套種;枇杷;枝梢生長(zhǎng);結(jié)果

      中圖分類號(hào):S663.1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1009-9980(2023)10-2149-11

      Effects of grapes in shelter facilities on tree growth and fruiting of interplanted loquat

      XU Qizhi, DENG Chaojun, JIANG Jimou*, CHEN Xiuping

      (Fruit Research Institute, Fujian Academy of Agricultural Sciences/Fujian Breeding Engineering Technology Center for Longan & Loquat, Fuzhou 350013, Fujian, China)

      Abstract: 【Objective】 In order to make full use of the limited space inside the horizontal grape trellis, this study observed and compared the differences in growth and fruiting between interplanted potted loquat trees under the grapes in shelter facilities and the potted loquat trees outside the facilities. The study will provide a reference for the application of “grape-loquat” interplanting model. 【Methods】 3-year-old loquat Xinbai No. 8 grafted trees with flower buds in the nutrition bag were interplanted with the 5-year-old grape Guipu No. 1 in the shelter facilities. 3-year-old potted loquat Xinbai No. 8 grafted trees with flower buds in the nutrition bags placed in the open air were used as the control. The effects of the ecological environment of the grape shelter facilities on tree growth, shoot growth quality, flowering quality, flowering shoot rate, leaf growth quality, fruit pest and disease incidence, fruit quality and yield per plant were observed for two consecutive years in interplanted potted loquat trees.【Results】 During the growth of the grapes, the shade effect on the loquat trees was highest when the grapes covered the trellis or during the period of growth of loquat summer shoots. The light intensity reduced by 92.37%, the temperature reduced by 6.10 ℃ and the relative humidity increased by 20.87% than that of the control at 12:00 am. During the post-harvest period of grapes or physiological differentiation period of loquat buds, there were a 76.70% decrease in light intensity, a 4.51 ℃ decrease in temperature and a 13.56% increase in relative humidity at 12:00 am. compared to the control. The lightest shade effect occurred in the period of grape winter pruning or growth stagnation period of young loquat fruit. The light intensity reduced by 15.90% and the temperature increased by 2.28 ℃ than that of the control at 12:00 am. In the potted loquat trees interplanted under the grapes, the number of shoot growth in the first year was 33.80% and significantly fewer than the control. There were no significant differences in tree crown width, tree height, trunk girth and canopy thickness between shaded loquat trees and the control. The number of shoot growth in the second year was 63.35% fewer than the control, and tree height, trunk girth and canopy thickness of shaded loquat trees were lower than the control by 29.04%, 26.40% and 44.65%, respectively. In the potted loquat trees interplanted under the grapes in shelter facilities, shoot length and leaf number in the first year were 36.30% and 32.33% lower than the control, respectively, with highly significant differences. Shoot thickness and panicle width were 17.91% and 21.86% lower than the control, respectively, with significant differences. Length and thickness of shoot, number of leaves, length and width of flowering spikes and number of flowering terminals in the second year were 57.44%, 29.38%, 49.56%, 47.13%, 50.71% and 42.51% lower than the control, respectively. The leaf length and width of summer shoots were significantly higher than that of the control; leaf length and width of spring shoots were significantly lower than that of the control, and no significant differences in leaf length and width in autumn shoots was found between the interplanted loquat trees and the control. The leaf thicknesses of spring, summer and autumn shoots were significantly smaller than that of the control. In the first year of the trial, due to the high rainfall during the fruit growing season, the rates of fruit cracking, anthracnose fruit and sunburn fruit for the interplanted potted loquat trees under grape shelter facilities were lower than that of the control by 16.65%, 26.20% and 7.93%, respectively. The rate of good fruit was 27.25% higher than that of the control. In the second year, the rate of fruit drop under the trellis was lower than that of the control by 14.03%. The rates of anthracnose, wrinkled, insect, and sunburn fruit were lower than that of the control by 14.28%, 3.88%, 3.04% and 3.73%, respectively. The rate of good fruit was higher than that of the control by 12.89%. In the first year of the trial, with no flower and fruit thinning, the spike weight and yield per plant of loquat trees in the trellis were 62.72% and 69.63% of those in the control, respectively. After flower and fruit thinning in the second year, the differences in cob weight, fruit mass, flesh thickness, soluble solids and flesh recovery of fruit from loquat trees in the trellis were insignificant compared to from the control trees; yield per plant was 69.67% of the control. 【Conclusion】 The loquat trees interplanted under the grapes in shelter facilities can grow and bear fruit normally, with lower incidence of fruit diseases and pests. It is a feasible model for interplant, but further research is needed on suitable supporting cultivation techniques to reduce the shading effect on the growth of interplanted loquat trees.

      Key words: Grapes; Grown in shelter facilities; Interplanting; Potted loquat; Shoot growth; Fruiting

      枇杷[Eriobotrya japonica (Thunb.) Lindl.]是我國(guó)南方特色常綠果樹(shù),其果肉柔軟多汁、酸甜適口,是深受消費(fèi)者喜愛(ài)的“早春第一果”。枇杷秋冬開(kāi)花、春末夏初成熟,露地栽培的枇杷在果實(shí)膨大期和轉(zhuǎn)色期遇晴雨交替、高溫等異常氣候時(shí)發(fā)生裂果[1]、日灼[2]等生理性病害,在夏梢抽生期常因強(qiáng)光、高溫影響枝梢生長(zhǎng)[3]。采用避雨設(shè)施栽培或樹(shù)冠覆蓋可避雨、遮陰防強(qiáng)光,是解決裂果、日灼等枇杷產(chǎn)業(yè)問(wèn)題的有效途徑。避雨棚膜能緩解“光合午休”,增強(qiáng)光合能力,有利于植株生長(zhǎng)發(fā)育[4]。枇杷夏季樹(shù)冠遮陰[5]、果實(shí)發(fā)育期避雨設(shè)施栽培[6]等,改善了生長(zhǎng)環(huán)境,達(dá)到提高品質(zhì)與產(chǎn)量、調(diào)節(jié)產(chǎn)期的效果。但設(shè)施栽培前期投入較大,要3~5 a(年)才可收回成本[7],制約了枇杷設(shè)施栽培模式的推廣。

      近年來(lái),避雨設(shè)施栽培在葡萄上的應(yīng)用越來(lái)越廣,以福建為例,2013年福建省葡萄種植面積8074 hm2,其中設(shè)施栽培面積776.33 hm2[7]。立體高效栽培是當(dāng)前葡萄設(shè)施栽培的一個(gè)重要方向,可充分利用設(shè)施大棚內(nèi)的有限空間,提高單位面積產(chǎn)量,獲取更高的經(jīng)濟(jì)效益[8]。水平棚架避雨栽培是福建葡萄設(shè)施栽培的主要種植模式[9]。水平棚架下有適合枇杷生長(zhǎng)的空間,探討利用現(xiàn)有葡萄栽培設(shè)施發(fā)展“避雨設(shè)施葡萄-枇杷”套種模式具有重要的產(chǎn)業(yè)意義。

      在枇杷花芽分化期利用遮陽(yáng)網(wǎng)適度遮陰可明顯降低樹(shù)冠內(nèi)部與地下的溫度,有利于枇杷枝葉生長(zhǎng)、提高枝梢抽穗率[5,10],也可促進(jìn)枇杷弱枝的花期提前[10]。夏季是葡萄生長(zhǎng)成熟期,枝、葉生長(zhǎng)量大,此時(shí)正是枇杷夏、秋梢生長(zhǎng)、花芽分化期,如過(guò)度蔭蔽會(huì)影響葉片光合產(chǎn)物累積,導(dǎo)致枇杷果實(shí)品質(zhì)下降[10-11],長(zhǎng)時(shí)間重度蔭蔽會(huì)造成落葉,甚至植株死亡[11];12月至翌年5月是葡萄落葉冬眠至萌芽開(kāi)花時(shí)期,其間棚架下光照充足、無(wú)遮陰,正是枇杷開(kāi)花結(jié)果、生長(zhǎng)發(fā)育和成熟期,有利于枇杷果實(shí)生長(zhǎng)。因此,枇杷與葡萄的物候期可以互補(bǔ),生產(chǎn)操作互不影響,臺(tái)灣地區(qū)已有在棚架葡萄下套種枇杷的研究報(bào)道[10]。枇杷夏梢生長(zhǎng)期、果實(shí)發(fā)育中后期受到短期、單一蔭蔽脅迫的影響已有報(bào)道,但枇杷在套種環(huán)境中受到持續(xù)、動(dòng)態(tài)蔭蔽,對(duì)樹(shù)體生長(zhǎng)和開(kāi)花結(jié)果的影響尚不明確,避雨設(shè)施葡萄套種枇杷的可行性尚未可知。為此,筆者利用葡萄水平棚架避雨栽培的動(dòng)態(tài)蔭蔽環(huán)境,研究避雨棚架及葡萄生長(zhǎng)對(duì)套種枇杷樹(shù)體生長(zhǎng)、枝葉質(zhì)量、成花質(zhì)量、果實(shí)病蟲(chóng)害和產(chǎn)量的影響,為探討避雨栽培葡萄下套種枇杷種植模式的可行性提供參考依據(jù)。

      1 材料和方法

      1.1 試驗(yàn)材料與試驗(yàn)設(shè)計(jì)

      試驗(yàn)連續(xù)2 a在福建省農(nóng)業(yè)科學(xué)院果樹(shù)研究所葡萄、楊梅基地進(jìn)行(福建省福州市),以避雨栽培葡萄下套種盆栽枇杷為處理,露地盆栽枇杷為對(duì)照。試驗(yàn)區(qū)避雨設(shè)施栽培葡萄為鍍鋅鋼管連棟拱形大棚,單跨寬度為8.0 m,棚頂距地面高度4.0 m,肩高度2.5 m,大棚頂部常年覆蓋的流滴膜已使用3 a,透光率87.0%~97.0%,邊膜除冬季低溫期封閉外均為開(kāi)放狀態(tài);葡萄水平棚架高度2.0 m;棚內(nèi)種植的葡萄品種為桂葡1號(hào),根域限制栽培模式,樹(shù)齡5 a,株距2.0 m,行距8.0 m,“一字形”整形,葡萄3月中旬發(fā)芽,4月底—5月初滿架,12月上旬落葉,12月底修剪。桂葡1號(hào)葡萄樹(shù)生長(zhǎng)旺盛,在開(kāi)花結(jié)果期間沒(méi)有修剪徒長(zhǎng)枝和過(guò)密枝。試驗(yàn)用的枇杷品種為新白8號(hào),選擇樹(shù)體大小和樹(shù)勢(shì)相近、帶花蕾的3年生嫁接大苗18株,移植在直徑60 cm、高度40 cm的無(wú)紡布營(yíng)養(yǎng)袋內(nèi)(圖1-A)。枇杷樹(shù)高度150 cm,冠徑140 cm,干周15 cm,枝梢數(shù)10~13個(gè)。枇杷試驗(yàn)樹(shù)9株置于棚內(nèi)2行葡萄樹(shù)之間,枇杷間的株距2.0 m,與葡萄主干的行距2.0 m;露地對(duì)照試驗(yàn)樹(shù)9株置于距避雨葡萄棚外10.0 m遠(yuǎn)的露地上,株距2.0 m。3株為1個(gè)試驗(yàn)小區(qū),3次重復(fù)。每株試驗(yàn)樹(shù)的樹(shù)盤上均放置1個(gè)滴灌頭,根據(jù)枇杷物候期及土壤濕度,設(shè)置一致的滴灌時(shí)間和滴灌量。試驗(yàn)第1年處理區(qū)和對(duì)照區(qū)均未疏花疏果,獲得的穗質(zhì)量、穗粒數(shù)、單果質(zhì)量等為自然坐果數(shù)據(jù)(圖1-B);試驗(yàn)第2年正常疏花疏果,根據(jù)結(jié)果枝生長(zhǎng)情況選留4~6粒·穗-1(圖1-C);試驗(yàn)樹(shù)其余修剪、套袋、施肥和病蟲(chóng)害防治等均按大田常規(guī)管理。

      1.2 測(cè)定內(nèi)容和方法

      1.2.1 田間調(diào)查與果實(shí)品質(zhì)分析 參照《農(nóng)作物種質(zhì)資源鑒定技術(shù)規(guī)程 枇杷》[12],分別于2017年和2018年5月、8月、11月枇杷的春梢、夏梢、秋梢葉片成熟時(shí)測(cè)量葉片的長(zhǎng)度、寬度、厚度;于每年11月調(diào)查枇杷的冠幅、樹(shù)高度、干周、葉幕層厚、枝梢數(shù)、花穗數(shù)等,并測(cè)量1年生枝梢長(zhǎng)度(夏梢+秋梢)、夏梢粗度和花穗大小,統(tǒng)計(jì)枝梢抽穗率。

      每年4月底—5月初枇杷果實(shí)成熟時(shí),調(diào)查單株果穗數(shù),測(cè)定單株產(chǎn)量,按試驗(yàn)小區(qū)每株采集成熟果穗各4穗,測(cè)定穗質(zhì)量,并調(diào)查果實(shí)病蟲(chóng)害情況;每試驗(yàn)小區(qū)隨機(jī)選取成熟果實(shí)各20粒,測(cè)定單果質(zhì)量、果肉厚度、果肉硬度和可溶性固形物含量,并統(tǒng)計(jì)可食率和單株產(chǎn)量。用精度0.01 g電子天平稱量單果質(zhì)量,用精度0.01 mm電子游標(biāo)卡尺測(cè)量果肉厚度,用GY-3型水果硬度計(jì)測(cè)定果肉硬度,用SRAP測(cè)糖儀測(cè)定可溶性固形物含量。

      1.2.2 微生態(tài)環(huán)境測(cè)定 于葡萄冬剪/枇杷幼果滯長(zhǎng)期(1月24日)、葡萄萌芽/枇杷幼果迅速膨大期(3月2日)、葡萄滿架/枇杷夏梢生長(zhǎng)期(6月30日)、葡萄采果后/枇杷花芽生理分化期(8月30日),分別在試驗(yàn)區(qū)和對(duì)照區(qū)各用3臺(tái)美國(guó)HOBO U12-012溫濕光度記錄儀,同步測(cè)定樹(shù)冠外圍的光照度、溫度和相對(duì)濕度,測(cè)定期為08:00—18:00,每1 h測(cè)定1次;選擇08:00、12:00和18:00共3個(gè)時(shí)間點(diǎn)分析棚內(nèi)葡萄架下枇杷和棚外枇杷的環(huán)境參數(shù)。

      1.3 統(tǒng)計(jì)分析

      數(shù)據(jù)用 Excel 2007進(jìn)行基礎(chǔ)統(tǒng)計(jì)和作圖,采用DPS 6.5 軟件進(jìn)行數(shù)據(jù)分析。

      2 結(jié)果與分析

      2.1 避雨設(shè)施葡萄對(duì)套種枇杷環(huán)境因子的影響

      由表1可知,在1月24日(葡萄冬剪/枇杷幼果滯長(zhǎng)期),08:00棚內(nèi)的溫度極顯著高于棚外,相對(duì)濕度顯著低于棚外,光照度是棚外的69.97%;12:00和18:00棚內(nèi)與棚外的相對(duì)濕度差異不顯著,12:00的光照度較棚外低15.90%、溫度高2.28 ℃,說(shuō)明了冬季的避雨設(shè)施在夜間有保溫、白天有增溫作用。3月2日(葡萄萌芽/枇杷幼果迅速膨大期),棚內(nèi)處理08:00、12:00和18:00的光照度分別較棚外低51.09%、29.42%和28.42%,溫度、相對(duì)濕度與棚外差異不顯著。6月30日(葡萄滿架/枇杷夏梢生長(zhǎng)期),除了08:00溫度差異不顯著外,棚內(nèi)的溫度、相對(duì)濕度和光照度均與棚外存在顯著或極顯著差異,12:00溫度較棚外降低6.10 ℃、相對(duì)濕度提高20.87%,3個(gè)時(shí)間點(diǎn)光照度分別降低了75.59%、92.37%、91.91%。8月30日(葡萄采果后/枇杷花芽生理分化期間),棚內(nèi)3個(gè)測(cè)定時(shí)間的光照度分別較棚外降低88.31%、76.70%、57.63%,12:00的溫度低于棚外4.51 ℃、相對(duì)濕度增加13.56%。避雨棚架及葡萄生長(zhǎng)均造成光照度不同程度降低,但不同時(shí)期的降低幅度不同。其中,葡萄滿架/枇杷夏梢生長(zhǎng)期影響最大,該期間的溫度和相對(duì)濕度也受到顯著影響,其次是葡萄采果后/枇杷花芽生理分化期,而葡萄冬剪/枇杷幼果滯長(zhǎng)期光照度受到的影響最小,其溫度反而較對(duì)照提高。這說(shuō)明避雨設(shè)施栽培葡萄冬季有增溫作用,夏季有降溫增濕效果。

      2.2 避雨設(shè)施葡萄對(duì)套種枇杷樹(shù)體生長(zhǎng)的影響

      由表2可知,試驗(yàn)第1年避雨設(shè)施葡萄下套種盆栽枇杷的枝梢數(shù)較棚外少33.80%,差異極顯著;冠幅、樹(shù)高度、葉幕層厚、干周均小于棚外,但差異不顯著。試驗(yàn)第2年,棚內(nèi)枇杷的樹(shù)高度、干周、葉幕層厚、枝梢數(shù)均極顯著小于棚外試驗(yàn)樹(shù),其中枝梢數(shù)比對(duì)照減少63.35%,樹(shù)高度、干周、葉幕層厚分別降低29.04%、26.40%、44.65%;棚內(nèi)枇杷的南北冠幅比棚外顯著減小。這說(shuō)明棚內(nèi)枇杷夏、秋季受葡萄棚架遮陰的影響,枇杷夏梢的側(cè)生枝抽發(fā)數(shù)量減少,并且影響夏秋梢的生長(zhǎng),使棚內(nèi)枝梢生長(zhǎng)數(shù)量減少。

      2.3 避雨設(shè)施葡萄對(duì)套種枇杷枝梢生長(zhǎng)和成花質(zhì)量的影響

      由表3可知,試驗(yàn)第1年避雨設(shè)施葡萄下套種的枇杷枝梢長(zhǎng)度、粗度、葉片數(shù)和花穗寬度分別比對(duì)照低36.30%、17.91%、32.33%和21.86%,差異極顯著,花穗長(zhǎng)度、花穗數(shù)與對(duì)照差異顯著,枝梢抽穗率與對(duì)照差異不顯著。試驗(yàn)第2年,套種枇杷的1年生枝梢長(zhǎng)度、粗度、葉片數(shù)、花穗長(zhǎng)度、寬度和花穗數(shù)分別是對(duì)照樹(shù)的42.56%、70.62%、50.44%、52.87%、49.29%、47.06%,差異極顯著;枝梢抽穗率與對(duì)照差異不顯著。這說(shuō)明了避雨設(shè)施栽培葡萄影響套種枇杷的枝梢質(zhì)量和花穗質(zhì)量。

      2.4 避雨設(shè)施葡萄對(duì)套種枇杷葉片質(zhì)量的影響

      避雨設(shè)施葡萄下套種枇杷的葉片質(zhì)量差異如圖2所示。棚內(nèi)枇杷的春梢葉片長(zhǎng)度、寬度是棚外的88.24%和91.31%,顯著或極顯著小于棚外;夏梢的葉片長(zhǎng)度、寬度是棚外的1.18倍和1.19倍,差異均達(dá)極顯著水平,秋梢葉片長(zhǎng)度、寬度與對(duì)照差異不顯著;棚內(nèi)枇杷的春梢、夏梢、秋梢葉片厚度是棚外的82.86%、75.00%和69.23%,均極顯著小于棚外。這說(shuō)明避雨設(shè)施栽培葡萄影響套種枇杷的春梢、夏梢、秋梢葉片質(zhì)量。

      2.5 避雨設(shè)施葡萄對(duì)套種枇杷果實(shí)病蟲(chóng)害的影響

      裂果、炭疽病、日灼、蟲(chóng)果等影響枇杷果實(shí)的商品性和經(jīng)濟(jì)價(jià)值。如表4和圖3所示,試驗(yàn)第1年由于果實(shí)生長(zhǎng)季雨水較多,避雨設(shè)施葡萄下套種枇杷的裂果率、炭疽病果率、日灼果率分別較對(duì)照減少16.65%、26.20%、7.93%,未發(fā)現(xiàn)皺果和蟲(chóng)果,好果率較對(duì)照高27.25%。試驗(yàn)第2年疏花疏果,果實(shí)生長(zhǎng)季干旱少雨,套種枇杷的落果率較對(duì)照低14.03%,炭疽病果率、皺果率、蟲(chóng)果率、日灼果率分別較對(duì)照低14.28%、3.88%、3.04%、3.73%,好果率較對(duì)照高12.89%。這說(shuō)明避雨設(shè)施栽培葡萄能有效減少套種枇杷果實(shí)病蟲(chóng)害發(fā)生,提高枇杷好果率。

      2.6 避雨設(shè)施葡萄對(duì)套種枇杷果實(shí)質(zhì)量的影響

      如表5所示,試驗(yàn)第1年,在未疏花疏果條件下,棚內(nèi)枇杷的果穗質(zhì)量、單株產(chǎn)量分別是棚外的62.72%、69.83%,極顯著或顯著低于棚外;棚內(nèi)枇杷的單果質(zhì)量、可溶性固形物含量分別是棚外的92.25%和90.58%,差異顯著;果肉厚度、硬度、可食率與棚外差異不顯著。試驗(yàn)第2年,統(tǒng)一疏花疏果,棚內(nèi)枇杷的果穗質(zhì)量、單果質(zhì)量、果肉厚度、可食率與棚外差異均不顯著;單株產(chǎn)量、可溶性固形物含量、果肉硬度分別是對(duì)照的69.67%、88.80%、84.72%,差異顯著。這說(shuō)明避雨設(shè)施栽培葡萄會(huì)影響套種枇杷的產(chǎn)量和果實(shí)品質(zhì)。

      3 討 論

      3.1 避雨設(shè)施葡萄對(duì)套種枇杷生長(zhǎng)環(huán)境的動(dòng)態(tài)影響

      已有研究表明,套種、遮陰等造成的蔭蔽脅迫會(huì)影響光照度、溫度和相對(duì)濕度,如大棚覆蓋的塑料薄膜會(huì)降低棚內(nèi)的光照度[13-14],而對(duì)溫度的影響因季節(jié)、天氣而異[14-16];棚內(nèi)溫度隨垂直高度的增加而升高[16],相對(duì)濕度亦受一定影響[14];遮陽(yáng)網(wǎng)在夏季遮陰樹(shù)冠,日平均氣溫和日平均相對(duì)濕度比棚外高,但最高氣溫、最大相對(duì)濕度較棚外低,日最低氣溫和最低相對(duì)濕度較棚外高[6];高位作物會(huì)對(duì)低位套種作物有蔭蔽作用[17],大幅降低光照度,影響溫度[18-19],對(duì)光質(zhì)也造成影響,紅光與遠(yuǎn)紅光比值降低[20];避雨設(shè)施栽培葡萄白天的光照度極顯著低于露地,午后的氣溫顯著高于露地、空氣濕度顯著低于露地[21],在4—5月,棚內(nèi)溫度較棚外高,且氣溫越高棚內(nèi)外的溫差越大,促進(jìn)了枇杷果實(shí)的生長(zhǎng)發(fā)育與成熟[7]。本試驗(yàn)中,避雨設(shè)施栽培葡萄的無(wú)滴膜和葡萄枝葉等共同作用,造成4個(gè)時(shí)期中午光照度較對(duì)照低15.90%~92.37%,光照度下降幅度為葡萄冬剪/枇杷幼果滯長(zhǎng)期<葡萄萌芽/枇杷幼果迅速膨大期<葡萄采果后/枇杷花芽生理分化期<葡萄滿架/枇杷夏梢生長(zhǎng)期;葡萄冬剪/枇杷幼果滯長(zhǎng)期因避雨棚邊膜封閉且透光率相對(duì)高,導(dǎo)致上午和中午的溫度顯著高于對(duì)照,葡萄滿架/枇杷夏梢生長(zhǎng)期,葡萄的生長(zhǎng)量最大,中午的溫度降低、相對(duì)濕度提高的幅度最大,葡萄采果后/枇杷花芽生理分化期間,中午的溫度對(duì)照較大幅度降低、相對(duì)濕度提高。已有研究認(rèn)為,樹(shù)冠內(nèi)相對(duì)光照度低于30%為無(wú)效光區(qū)域[22-23],用透光率分別為15%、2.25%遮陽(yáng)網(wǎng)持續(xù)遮陰脅迫下,枇杷落葉嚴(yán)重、干物質(zhì)含量明顯下降[11]。因此在葡萄的年生長(zhǎng)周期內(nèi),套種區(qū)的枇杷經(jīng)歷了“輕(葡萄冬剪期/枇杷幼果滯長(zhǎng)期)-中(葡萄萌芽期/枇杷幼果迅速膨大期)-重(葡萄滿架果實(shí)生長(zhǎng)期/枇杷夏梢生長(zhǎng)期)-較重(葡萄采果后/枇杷花芽生理分化期)”的持續(xù)動(dòng)態(tài)蔭蔽脅迫。

      3.2 避雨設(shè)施葡萄下的動(dòng)態(tài)環(huán)境因子變化對(duì)枇杷生長(zhǎng)的影響

      植物的生長(zhǎng)發(fā)育與光信號(hào)密切相關(guān),不同光強(qiáng)和光質(zhì)影響枝葉生物量、光合生態(tài)參數(shù),影響形態(tài)建成和物質(zhì)積累[20,24]。蔭蔽脅迫可誘導(dǎo)生長(zhǎng)素(indoleacetic acid,IAA)、赤霉素(gibberellins,GA)等參與介導(dǎo)響應(yīng),進(jìn)而影響生長(zhǎng)發(fā)育狀態(tài)[25]。荔枝全株遮陰后,新葉的比重顯著降低,葉片變得“大而薄”[26],顯著降低荔枝枝梢的生長(zhǎng)量[27]。但是,在樹(shù)體恢復(fù)期和主花期前期,蔭蔽度30%可以促進(jìn)胡椒葉片的糖積累[28]。枇杷成年樹(shù)要求較充足的光照,蔭蔽嚴(yán)重的樹(shù)冠會(huì)造成內(nèi)膛郁閉或骨干枝光禿,結(jié)果部位外移[3],果實(shí)生長(zhǎng)發(fā)育期持續(xù)高強(qiáng)度蔭蔽,會(huì)造成枇杷葉片變薄、落片,影響干物質(zhì)積累[11]。本試驗(yàn)中,由于受避雨設(shè)施葡萄的長(zhǎng)期蔭蔽脅迫,棚內(nèi)套種盆栽枇杷的枝梢數(shù)量、枝梢長(zhǎng)度、粗度、葉片數(shù)均明顯減少,而周政華等[5]認(rèn)為夏季不同遮光率的遮陽(yáng)網(wǎng)對(duì)枇杷新梢的數(shù)量、長(zhǎng)度、粗度等沒(méi)有影響。結(jié)論不同,可能與本試驗(yàn)遮陰時(shí)間長(zhǎng)、遮陰強(qiáng)度不同及品種反應(yīng)不同有關(guān)。棚內(nèi)枇杷種植第2年的南北冠幅、樹(shù)高度、干周、葉幕層厚、枝梢數(shù)均顯著減少,花穗變小、葉片薄但葉面積增大,與周琳耀等[26]研究結(jié)果相同,這是因?yàn)槭a蔽脅迫降低了紅光與遠(yuǎn)紅光的比值,有利于植株葉片變大,以增加生物量積累[29]。這說(shuō)明遮陰強(qiáng)度越大、持續(xù)時(shí)間越長(zhǎng),越不利于枇杷樹(shù)體生長(zhǎng)。因此,避雨設(shè)施栽培葡萄套種枇杷,在夏季葡萄開(kāi)花結(jié)果的生長(zhǎng)旺盛期,需加強(qiáng)葡萄的修剪,增加光照,減弱對(duì)枇杷夏梢和秋梢生長(zhǎng)的遮陰作用,此外還需對(duì)葡萄與枇杷的品種進(jìn)行篩選。

      3.3 避雨設(shè)施葡萄下的環(huán)境因子對(duì)枇杷結(jié)果的影響

      蔭蔽脅迫影響作物的光合速率[30-31]、礦質(zhì)營(yíng)養(yǎng)積累[26]、坐果率[32]、產(chǎn)量[33]和病害發(fā)生[13,32],適度遮陰會(huì)提高桃[22]、草莓[34]果實(shí)品質(zhì)。櫻桃果實(shí)膨大期適度遮陰可降低裂果率、增加單果質(zhì)量[35]。開(kāi)花早期遮陰對(duì)番茄果實(shí)產(chǎn)量影響較小,盛花期重度遮陰使產(chǎn)量降低[36]。本試驗(yàn)中,第1年未疏花疏果,葡萄遮陰顯著影響枇杷花穗數(shù)、花穗大小、果穗質(zhì)量、單果質(zhì)量和單株產(chǎn)量;第2年正常疏花疏果后,棚內(nèi)枇杷的單株產(chǎn)量較棚外顯著減少,對(duì)果穗質(zhì)量、單果質(zhì)量的影響不顯著。這是因?yàn)殍凌说慕Y(jié)果枝性狀與產(chǎn)量關(guān)系密切,而持續(xù)動(dòng)態(tài)蔭蔽脅迫下,光合產(chǎn)物的積累受到影響[11,31],造成枝梢數(shù)量與質(zhì)量下降,進(jìn)而顯著影響枇杷的開(kāi)花結(jié)果,降低產(chǎn)量。果實(shí)成熟期覆蓋遮陽(yáng)網(wǎng)[5]、設(shè)施栽培[37]可改善生長(zhǎng)環(huán)境,有效防止裂果,但設(shè)施內(nèi)溫度過(guò)高會(huì)導(dǎo)致果實(shí)日灼與皺果[37]。試驗(yàn)第1年,果實(shí)生長(zhǎng)季雨水較多,避雨設(shè)施葡萄下套種盆栽枇杷的裂果率、炭疽病果率、日灼果率明顯減少。第2年干旱少雨,棚內(nèi)枇杷落果率、炭疽病果率、日灼果率、皺果率顯著減少。這表明避雨設(shè)施葡萄可減少套種枇杷果實(shí)的病蟲(chóng)害,提高好果率。

      4 結(jié) 論

      避雨設(shè)施栽培葡萄的生長(zhǎng)發(fā)育,可動(dòng)態(tài)影響套種區(qū)的微生態(tài)環(huán)境,降低套種枇杷的枝梢、花穗的數(shù)量和質(zhì)量,而套種的枇杷可正常生長(zhǎng)、結(jié)果,且果實(shí)病蟲(chóng)害減少,說(shuō)明避雨設(shè)施栽培葡萄下套種枇杷是一種可行的種植模式,但需進(jìn)一步研究適宜的配套栽培技術(shù)。

      致謝:本試驗(yàn)得到本所葡萄和楊梅課題組的試驗(yàn)場(chǎng)地支持,一并致謝!

      參考文獻(xiàn) References:

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      收稿日期:2023-04-03 接受日期:2023-07-03

      基金項(xiàng)目:福建省屬公益類科研院所基本科研專項(xiàng)(2020R1028006,2016R1013-9);中央引導(dǎo)地方科技發(fā)展專項(xiàng)(2021L3022);國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2019YFD1000905);福建省農(nóng)業(yè)科學(xué)院科技創(chuàng)新團(tuán)隊(duì)(CXTD2021004-1);中國(guó)農(nóng)技協(xié)福建科協(xié)莆田枇杷科技小院

      作者簡(jiǎn)介:許奇志,男,農(nóng)藝師,主要從事果樹(shù)栽培、育種與種質(zhì)資源研究。Tel:13328279661,E-mail:xqzhi1839@163.com

      通信作者Author for correspondence. Tel:13774575126,E-mail:jjm2516@126.com

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