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1.
【目的】研究覆盖条件对茶园小气候及碾茶品质的影响,筛选出利于碾茶品质的覆盖方式,为提高碾茶生产质量提供理论依据。【方法】以龙井43为试验品种,黑色遮阳网为覆盖材料,设3种遮光度（55%、75%、95%）、2种覆盖高度（直接覆盖高0.6 m、棚式覆盖高1.8 m）、3种覆盖时间（15、20和25 d）,共18组覆盖处理,以不覆盖为对照。在秋春季两季进行试验,分析不同覆盖处理对茶园小气候、鲜叶产量、叶绿素含量、碾茶中生化成分及感官品质的影响。【结果】覆盖能有效降低茶蓬面光照强度和光合有效辐射,降低日最高温,缩小气温日较差,提高空气湿度。棚式覆盖对于茶园小气候的稳定效果优于直接覆盖。覆盖后茶树鲜叶中叶绿素总量增加,秋季和春季分别以遮光度75%+直接覆盖15 d处理和遮光度95%+棚式覆盖15 d处理的叶绿素含量最高,分别比对照高33.86%和57.27%。覆盖使碾茶中氨基酸含量增加,秋季和春季分别以遮光度95%、直接覆盖25和20 d的氨基酸含量最高,分别高于对照127.55%和144.06%。覆盖后碾茶中茶多酚含量降低,覆盖天数与茶多酚含量呈负相关,秋季和春季分别以遮光度95%+棚式覆盖25 d和遮光度75%+直接覆盖25 d处理的茶多酚含量最低,分别低于对照54.04%和55.19%。覆盖使碾茶中咖啡碱含量提高,秋春两季均以遮光度95%+直接覆盖20 d处理的咖啡碱含量最高,分别比对照高58.91%和62.98%。秋季覆盖使水浸出物含量有所降低。高遮光度和长时间遮光处理不利于茶树干物质积累,秋春两季产量均以遮光度95%+直接覆盖处理的产量最低。覆盖后碾茶外形颜色绿润、汤色黄绿明亮、有清香、滋味清爽,感官品质高于未覆盖处理。【结论】覆盖有利于稳定茶园小气候。延长遮光时间、提高遮光度可提高碾茶品质,过度遮阴会导致产量降低。使用遮光度95%的遮阳网棚式覆盖25 d后碾茶综合品质最优,可在生产中推广应用。  相似文献   

2.
代飞  张昆  段凯  邓道茂  王修林 《安徽农业科学》2007,35(33):10741-10742
[目的]有效解决小棚漂浮育苗不易成功的问题。[方法]用松枝(杉枝)、遮阳网、草扇进行遮光,于2002~2004年研究了遮光对小棚漂浮育苗的影响。[结果]随着遮光程度的增加,出苗率呈逐渐上升趋势,在遮光度达25.0%,出苗率接近100%,再增加遮光程度,出苗率稳定在90%以上。遮光度在20.0%~30.0%时,烟苗素质好,随着遮光程度增加,烟苗素质逐渐减弱。遮光时间从播种至小十字期比较适宜,遮光的最关键时期是刚开始出苗时。湿松枝(杉枝)遮盖棚面对烟苗出苗率效果最好,其次为遮阳网>草扇>对照。遮光能稳定小棚内温度,4种遮光方式的效果为草扇>松枝(杉枝)>遮阳网>未遮光(对照)。遮光还能有效减轻自然灾害对烟苗的伤害。[结论]透光率70.0%~80.0%的遮阳网对小棚漂浮育苗的效果最好。  相似文献   

3.
代谢组学解析遮阴对茶叶主要品质成分的影响   总被引：2，自引：1，他引：1  
【目的】 茶叶生产上常采用遮阴处理来提高其品质,然而,黑暗遮阴对茶叶品质的影响尚未清楚。本文重点研究黑暗遮阴对茶叶中主要品质成分的影响,以期更加详细了解遮阴与茶叶品质的关系。【方法】利用遮阳网对茶树进行中度（65.0%）、黑暗（99.7%）两个遮阴处理,不遮阴作为对照;采用紫外分光光度法检测总多酚、总氨基酸、总黄酮的含量,同时采用超高效液相色谱-四级杆-飞行时间质谱（UHPLC-Q-TOF/MS）对茶叶中的主要品质成分进行详细调查。【结果】 与对照相比,中度遮阴显著降低了茶叶的总氨基酸、总黄酮含量（P<0.05）,轻微降低了总多酚含量,增加了酚氨比;黑暗遮阴显著降低了总氨基酸和总黄酮含量,显著增加了总多酚含量和酚氨比（P<0.05）。主成分分析（PCA）表明,两个遮阴处理明显改变了茶树叶片的代谢组。进一步鉴定得到了87个化合物,包括2个生物碱、18个氨基酸、12个儿茶素类、8个儿茶素二聚体类、19个黄酮（醇）糖苷、5个香气糖苷、6个核苷（酸）、9个酚酸、8个其他化合物;与对照相比,82个化合物在遮阴处理后出现显著差异（P<0.05）。遮阴后,生物碱含量显著增加;氨基酸呈现多样性变化,半数以上氨基酸含量显著下降;部分儿茶素类及二聚儿茶素类物质的含量在中度遮阴后显著降低,然而大部分儿茶素类和儿茶二聚体素类物质的含量却在黑暗遮阴后显著上升;绝大部分黄酮（醇）糖苷的含量在遮阴后出现显著下降,且遮阴程度越高,下降越多;大部分香气糖苷含量在遮阴后显著上升;大部分核苷（酸）含量在遮阴后显著降低;多数酚酸的含量在遮阴后显著上升。【结论】黑暗遮阴后,生物碱、儿茶素类及儿茶素二聚体类等物质含量显著上升,氨基酸含量显著下降,酚氨比显著上升,预示黑暗遮阴处理可能不利于提高茶叶的品质。  相似文献   

4.
【目的】探究遮阴及复光下茶树主要碳氮代谢物动态变化,为茶树遮阴及复光过程中鲜叶适制性的选择提供理论依据。【方法】开展大田试验,以黄金茶1号、湘妃翠和金萱茶树品种为试验材料,设遮阴度80%和95%,分别在遮阴前、遮阴第12 d和复光后第1、3和5 d取1芽2叶,检测新梢可溶性糖、黄酮、咖啡碱、氨基酸组分和儿茶素组分等指标,分析遮阴及复光下茶树新梢碳氮代谢物和品质变化规律。【结果】遮阴下,3个茶树品种的茶多酚含量显著下降（P<0.05,下同）,黄金茶1号和湘妃翠的酚氨比降至4~5,简单儿茶素/酯型儿茶素降至0.23~0.42。黄金茶1号在遮阴度80%处理下酚氨比和叶绿素a/b显著低于遮阴度95%;与遮阴度80%处理相比,湘妃翠和金萱在遮阴度95%处理下酚氨比和叶绿素a/b显著降低,水浸出物和可溶性糖含量增加,且金萱在遮阴度95%处理下儿茶素品质指数显著高于遮阴度95%。复光后,3个茶树品种游离氨基酸的变异系数均大于茶多酚;湘妃翠和金萱的酚氨比大于7,儿茶素品质指数高于遮阴前。遮阴及复光过程中,3个茶树品种的水浸出物、黄酮和表没食子儿茶素没食子酸酯（EGCG）含量在复光第5 d最高。遮阴及复光下金萱茶多酚和游离氨基酸含量的变异系数低于黄金茶1号和湘妃翠;遮阴第12 d,遮阴度95%处理下湘妃翠和遮阴度80%处理下黄金茶1号的主要碳代谢物含量最低,主要氮代谢物含量最高。【结论】茶树为适应环境变化进行碳氮代谢调整,从而改变鲜叶的适制性。遮阴环境及复光前期茶树鲜叶适制名优绿茶,复光后期茶树鲜叶更适制优质红茶。  相似文献   

5.
《农业科学学报》2023,22(7):2041-2053
Light deficiency is a growing abiotic stress in rice production. However, few studies focus on shading effects on grain yield and quality of rice in East China. It is also essential to investigate proper nitrogen (N) application strategies that can effectively alleviate the negative impacts of light deficiency on grain yield and quality in rice. A two-year field experiment was conducted to explore the effects of shading (non-shading and shading from heading to maturity) and panicle N application (NDP, decreased panicle N rate; NMP, medium panicle N rate; NIP, increased panicle N rate) treatments on rice yield- and quality-related characteristics. Compared with non-shading, shading resulted in a 9.5–14.8% yield loss (P<0.05), mainly due to lower filled-grain percentage and grain weight. NMP and NIP had higher (P<0.05) grain yield than NDP under non-shading, and no significant difference was observed in rice grain yield among NDP, NMP, and NIP under shading. Compared with NMP and NIP, NDP achieved less yield loss under shading because of the increased filled-grain percentage and grain weight. Shading reduced leaf photosynthetic rate after heading, as well as shoot biomass weight at maturity, shoot biomass accumulation from heading to maturity, and nonstructural carbohydrate (NSC) content in the stem at maturity (P<0.05). The harvest index and NSC remobilization reserve of NDP were increased under shading. Shading decreased (P<0.05) percentages of brown rice, milled rice, head rice, and amylose content while increasing (P<0.05) chalky rice percentage, chalky area, chalky degree, and grain protein. NMP demonstrated a better milling quality under non-shading, while NDP demonstrated under shading. NDP exhibited both lower chalky rice percentage, chalky area, and chalky degree under non-shading and shading, compared with NMP and NIP. NDP under shading decreased amylose content and breakdown but increased grain protein content and setback, contributing to similar overall palatability to non-shading. Our results suggested severe grain yield and quality penalty of rice when subjected to shading after heading. NDP improved NSC remobilization, harvest index, and sink-filling efficiency and alleviated yield loss under shading. Besides, NDP would maintain rice’s milling, appearance, and cooking and eating qualities under shading. Proper N management with a decreased panicle N rate could be adopted to mitigate the negative effects of shading on rice grain yield and quality.  相似文献   

6.
There is limited information about the combined effect of shading time and nitrogen(N) on grain filling and quality of rice. Therefore, two japonica super rice cultivars, Nanjing 44 and Ningjing 3, were used to study the effect of shading time and N level on the characteristics of rice panicle and grain filling as well as the corresponding yield and quality. At a low N level(150 kg N ha~(–1), 150 N), grain yield decreased(by 21.07–26.07%) under the treatment of 20 days of shading before heading(BH) compared with the no shading(NS) treatment. These decreases occurred because of shortened panicle length, decreased number of primary and secondary branches, as well as the grain number and weight per panicle. At 150 N, in the treatment of 20 days of shading after heading(AH), grain yield also decreased(by 9.46–10.60%) due to the lower grain weight per panicle. The interaction of shading and N level had a significant effect on the number of primary and secondary branches. A high level of N(300 kg N ha~(–1), 300 N) could offset the negative effect of shading on the number of secondary branches and grain weight per panicle, and consequently increased the grain yield in both shading treatments. In superior grains, compared with 150 N NS, the time to reach 99% of the grain weight(T_(99)) was shortened by 1.6 to 1.7 days, and the grain weight was decreased by 4.18–5.91% in 150 N BH. In 150 N AH, the grain weight was 13.39–13.92% lower than that in 150 N NS due to the slow mean and the maximum grain-filling rate(GR_(mean )and GR_(max)). In inferior grains, grain weight and GR_(mean) had a tendency of 150 N NS150 N BH150 N AH. Under shaded conditions, 300 N decreased the grain weight due to lower GR_(mean) both in superior and inferior grains. Compared with 150 N NS, the milling and appearance qualities as well as eating and cooking quality were all decreased in 150 N BH and 150 N AH. Shading with the high level of 300 N improved the milling quality and decreased the number of chalky rice kernels, but the eating and cooking quality was reduced with increased chalky area and overall chalkiness. Therefore, in the case of short term shading, appropriate N fertilizer could be used to improve the yield and milling quality of rice, but limited application of N fertilizer is recommended to achieve good eating and cooking quality of rice.  相似文献   

7.
The objective of the current study is to investigate the effects of different stages of shading after anthesis on grain weight and quality of maize at cytology level.The shading experiments were conducted in the field from 2005 to 2006,with a common maize cultivar(TY2)as the experimental material.Plants were given stress using horizontal shading net and the light intensity was reduced by 55%.Field-grown maize plants were shaded at 1-14 d(S1),15-28 d(S2),and 29-42 d(S3)after pollination,respectively.Control plants(S0)were grown under natural light.Grain weight,quality,endosperm cell proliferation,cob sugar content,and grain pedicel vascular bundle cross section area were measured.The ultrastructural changes of endosperm cells and endosperm transfer cells were observed after pollination.The result indicated that the grain weight,starch content,endosperm cell number,and volume were declined after shading.On the contrary,the proportion of embryo and endosperm,protein content,and fat content in grain increased.Shading treatments significantly delayed the development of the starch granules and remarkably reduced the endosperm filling status.Among the three treatments.the number of the grain endosperm was the least under shading stress at 1-14 d after pollination.However,the volume of starch granules and the substantiation of endosperm under shading treatment at 15-28 d after pollination were the worst.Compared with the control(natural sunlight without shading),the soluble sugar of maize cob increased significantly,while there was no obvious change in vascular structure of small cluster stalk.The number of protein body in maize endosperm was influenced markedly by low light at different stages after pollination.Low light decreased the volume of the grain endosperm transfer and the cell wall extensions of the basal transfer cells became thinner and shorter under shading treatment than those of the control.Furthermore,the degree of connection and the capacity of the nutrient transport were decreased and the mitochondrion number of the transfer cell was reduced after shading.The change in grain quality after shading was observed due to increase in the proportion of embryo and endosperm.The morphology and functions in endosperm transfer cell and the shortage of energy restricted the nutrient transport greatly with shading at different stages,suggesting that an impeded flux may be one of the important reasons for the reduction of maize grain weight of maize grain at later growth stage under low light condition.  相似文献   

8.
为探讨弱光胁迫对谷子农艺性状、小米品质及蒸煮特性的影响，并为黄土高原低洼地带谷子种植提供理论数据，以长生13号为材料，2018—2019年重复调查其在4种遮光程度(正常自然光照为A1、遮光面积30%为A2、遮光面积50%为A3、遮光面积70%为A4)下的农艺性状、产量、干物质量、小米品质及蒸煮特性变化情况。结果表明：遮光程度的增加显著降低了谷子穗粗、穗重、穗粒重、单株干物质量和产量，其中A1处理与A4处理间的产量减幅2018年为1 695.11 kg·hm-2、2019年为1 774.95 kg·hm-2；相对叶绿素含量（SPAD）也是随着遮光程度的增加而降低，其中A4处理SPAD均值比A1处理2018年减小2.18、2019年减小2.68；而峰值粘度、直链淀粉、胶稠度、脂肪含量均是随着遮光程度的增加而先增后减。相关性分析表明，产量与遮光程度呈显著负相关，2018、2019年相关系数分别为-0.899、-0.917。  相似文献   

9.
Tree peony seed is unique for its super-high content of unsaturated fatty acid and is thus considered as an important source of woody oil. However, photosynthetic production is greatly reduced under high light intensity and air temperature during the seed filling period, which negatively affects seed yield and quality. The objective of this study was to determine if appropriate shading improves yield and quality of seed in oilseed peony. In this study, oilseed peony trees were shaded by different density polyethylene nets from four weeks after flowering to harvest stages to form light, moderate, and severe shadings, equivalent to about 80, 40, and 20% of full solar exposure, respectively. The effects of different shadings on some physiological parameters, yield and yield components, and nutritional composition of seed were examined. Averaged across two years, light shading increased the actual net photosynthetic rate (Pn) by 16.8%, the maximum net photosynthetic rate (Pmax) by 81.4%, chlorophyll (Chl) content by 52.8%, auxin (IAA) content by 38.1%, and gibberellic acid (GA3) content in leaves by 6.3%; it decreased the accumulation of H2O2 in leaves by 24.8%, malondialdehyde (MDA) by 22%, and endogenous abscisic acid (ABA) by 8.8%, indicating that leaf senescence in late season was considerably delayed. Light shading increased seed yield, and contents of crude fat and unsaturated fatty acids by 9.7, 5.6, and 9.6%, respectively, while moderate or severe shading significantly reduced all the three parameters. Light shading increased seed weight, but moderate or severe shading reduced seed weight or follicle density. The improved seed yield under light shading was mainly due to increased seed weight, while the reduced seed yield under moderate or severe shading was mainly attributed to reduce follicle density and seed weight. The improved seed weight and content of unsaturated fatty acids under light shading was possibly due to the delayed leaf senescence. The overall results indicated that light shading is beneficial to yield and quality parameters of seed in oilseed peony. Cultivating oilseed peony under a light shading environments such as partially closed forests would better increase total output and income per unit land area than that under full solar exposure.  相似文献   

10.
抹茶是一种以覆盖茶鲜叶加工而成的蒸青茶（碾茶）为原料,并用专用工具（石磨）碾磨出来的茶产品,其原料的品质直接影响抹茶的品质。本试验以径山地区的主要品种“鸠坑”、“迎霜”为试材,通过不同覆盖遮荫栽培技术的对比试验,研究其对鲜叶性状及茶叶中多酚类、氨基酸类、叶绿素等生化成分的影响。结果表明,覆盖遮阳处理技术不仅能明显提高芽叶的鲜嫩度,而且能明显提高茶叶中的叶绿素和游离氨基酸的含量,同时又能有效降低茶叶中多酚类物质的含量,从而又使鲜叶原料的酚氨比大幅度降低。所以,这对全面提升抹茶品质至关重要。  相似文献   

11.
不同遮荫度下茶树生理生化特性的研究   总被引：7，自引：1，他引：6  
2009年春季,在与果树问作的茶园中选取遮荫度为15%、30%、50%的茶树,以其相邻的未遮荫茶树作对照,研究了不同遮荫度下茶树的生理生化特性,旨在为复合茶园构建中遮荫度的合理设置提供理论依据.研究结果表明:遮荫能促进茶树新梢提早萌发,对新梢叶数量无显著影响,但芽重和鲜叶产量都有所提高;遮荫茶树呼吸强度均有所下降,因而净光合强度提高,进而增加鲜叶产量;遮荫茶树的茶多酚含量下降,其氨摹酸、咖啡碱含量则有所提高,使得酚氨比变小,水浸出物含量提高,有益于改善绿茶的品质,且50%遮荫较15%和30%遮荫更适于茶树的生长发育.品种对茶树生理生化特性均有影响,所以在对茶叶产量和品质进行评价时,应考虑品种的差异性.  相似文献   

12.
花后不同时期遮光对玉米粒重及品质影响的细胞学研究   总被引：10，自引：4，他引：6  
【目的】从细胞学角度探讨玉米花后不同时期遮光对玉米籽粒重量及品质的影响。【方法】以普通玉米泰玉2号为材料,大田条件下分别于授粉后1—14d(S1)、15—28d(S2)及29—42d(S3)遮光55%,以大田自然光照条件下生长的玉米作为对照(S0),对不同遮光处理下玉米粒重、品质、胚乳细胞增殖变化及穗轴可溶性糖含量进行了分析测定,对小穗柄维管束截面积、胚乳细胞及胚乳传递细胞的超微结构进行了观察。【结果】各时期遮光使籽粒重量、淀粉含量、胚乳细胞数量和体积降低,籽粒胚/胚乳比、蛋白质含量、粗脂肪含量升高。遮光延迟了淀粉粒的发育,降低了胚乳细胞的充实度;前期遮光籽粒胚乳细胞数目最少,中期遮光淀粉粒体积最小,胚乳细胞的充实状态最差。遮光后穗轴中可溶性糖含量升高,小穗柄维管束截面积无明显变化;遮光使胚乳细胞中蛋白质体增多,胚乳传递细胞变小,传递细胞壁内突变稀、变短,不同层次间连接程度下降,养分传输能力降低,胚乳传递细胞中线粒体数量减少。【结论】花后不同时期遮光改变了玉米籽粒品质,系籽粒中胚比重增加及胚乳细胞内含物比例变化所致。遮光后胚乳传递细胞形态与功能的变化及较低的线粒体数量限制了养分的传输,"流"不畅是生育后期遮光玉米粒重降低的重要原因之一。  相似文献   

13.
为研究遮荫时间对信阳地区薮北种茶树化学成分的影响,对薮北种进行7天、10天、15天三种不同的遮荫时间处理,以不遮荫的薮北种茶树作为对照,分析其化学成分的变化,探究较适宜薮北种茶树种植的遮荫天数。结果表明：遮荫处理后茶多酚和水浸出物含量有所降低,游离氨基酸和咖啡碱含量增加,酚氨比降低,可溶性糖含量与遮荫影响不大。遮荫7天的效果最好,茶多酚和水浸出物含量较其他遮荫条件高,咖啡碱、游离氨基酸和可溶性糖含量最高,酚氨比低于对照,绿茶品质相对其他遮荫时间处理较好。  相似文献   

14.
Reproductive output from enlarged or reduced magpie broods showed that each female generally lays a clutch of optimal size. This size varies considerably between females. Approximately 85 percent of the within-years variation in clutch size was associated with differences between territories. Colonial bird species, lacking individual foraging territories, have a smaller clutch size variation than territorial species.  相似文献   

15.
夏季遮荫对猕猴桃生长发育的影响   总被引：3，自引：0，他引：3  
以中华猕猴桃翠玉和美味猕猴桃米良一号为试材,研究不同遮荫强度对猕猴桃生长发育的影响。结果表明:适度遮荫具有显著的保叶保果效果,能显著提高猕猴桃当年的果实产量、品质和贮藏性;翠玉的最适遮荫强度在25%左右,米良一号最适遮荫强度为50%左右。过度遮荫会降低果实的内在品质,并使植株翌年萌芽率与花量下降。  相似文献   

16.
光照强度对辣椒果实品质代谢的影响   总被引：4，自引：0，他引：4  
本试验以辣椒(Capsicum annuum var.Longrum)为材料,系统研究了不同遮荫条件对其果实品质的影响。结果表明,随着光照强度的减弱,果实的重量和体积,可溶性果胶,可溶性糖、抗坏血酸、有机酸、干物质及辣椒素的含量都有不同程度的降低。弱光下果实中叶绿素含量较高,分解速度较慢,而茄红素的合成则相对延迟。  相似文献   

17.
高温干旱季节茶园覆盖遮荫的综合效应研究   总被引：5，自引：0，他引：5  
夏、秋季高温低湿期选择金萱、白叶单丛、英红九号3个茶树品种生产茶同进行覆盖黑色遮阳网试验,探讨了遮荫对茶园田间气候因子、茶树生理、茶叶产量及品质的影响.结果表明,通过遮荫处理,茶园的田间气温、极端高温、温度日较差、光照强度均显著降低,空气湿度明显增加,田间气候明显改善;茶鲜叶中的苦涩味物质茶多酚、咖啡碱含量降低,氨基酸含量显著增加,酚氨比值显著降低,茶叶品质明显改善.但在实际生产中,茶园遮荫需根据茶树品种的耐荫特性确定适宜的遮光度和遮荫时间,否则将影响茶树光合作用和茶叶产量.  相似文献   

18.
不同遮荫处理对绿茶品质的影响   总被引：6，自引：0，他引：6  
苦涩味重是影响夏、秋绿茶品质的重要因素。通过对不同季节的茶园进行不同程度的遮荫处理,对茶叶中与茶汤苦涩味相关的主要化学成分进行分析。结果表明,遮荫处理能使茶叶中氨基酸含量增加;茶多酚含量、酚氨比比值降低,优化了氨基酸和儿茶素组分,同时叶绿素含量也增加,从而提高了绿茶的品质。遮荫处理对于夏茶的影响较大,秋茶次之,春茶的影响较小,且双层黑色遮荫网的效果优于单层黑色遮荫网的效果。  相似文献   

19.
李天福  王彪  曾永平  张杰 《安徽农业科学》2012,40(33):16071-16074
[目的]研究不同遮阳处理对烤烟(Nicotiana tabacum L.)生长及产质量的影响,明确光照条件与烤烟生长的相互关系。[方法]供试烤烟品种为K326。于烤烟团棵期用生产上常用的黑色遮阳网进行遮阳处理,A处理为60%的网孔密度,B处理为90%的网孔密度,另设一个对照CK(不遮阳)。A、B每处理栽植120株,3次重复,对照种植80株,不设重复。各处理及对照小区周围设两行保护行,南北向排列,行株距为120 cm×50 cm。[结果]遮阳不利于烤烟的地上部分干物质积累和生育期的正常进程。60%遮阳度处理有利于烤烟叶长、叶面积、株高、总叶数、茎叶夹角和地下部分干鲜比的增加,90%遮阳度处理促使烤烟节间距显著增加。随着遮阳度的增加,烤后烟叶产量、产值、均价、上中等烟比例上均较对照明显下降。此外,不同遮阳处理对烟田田间小气候的影响也较为显著。[结论]该研究可为烤烟适生性分析和种植区划提供理论基础。  相似文献   

20.
【目的】研究果粮间作模式下,果树遮阴程度对间作冬小麦籽粒产量和营养品质的影响,为新疆南疆果粮间作模式的选择和优化提供理论依据。【方法】以扁桃-冬小麦(新冬20号)间作模式为研究对象,设置轻度遮阴(日平均光照强度为自然光强度的75%)和重度遮阴(日平均光照强度为自然光强度的30%)2个处理,以大田条件为对照。分别测定不同处理条件下冬小麦籽粒产量构成指标、淀粉含量及组分、蛋白质含量及组分及氨基酸组分和含量。【结果】轻度遮阴条件下间作冬小麦单位面积有效穗数和单位面积产量均显著提高;总淀粉含量、直链淀粉/支链淀粉均升高;谷蛋白/醇溶蛋白、氨基酸含量降低。重度遮阴条件下单位面积产量及产量构成指标均显著降低,淀粉相对含量及直链淀粉/支链淀粉对对照无显著差异;醇溶蛋白含量显著升高,氨基酸评分提高。【结论】果粮间作模式下,果树树阴移动营造的轻度遮阴条件有利于冬小麦籽粒产量的形成,籽粒淀粉品质提高;重度遮阴条件下籽粒产量大幅降低,籽粒蛋白质相对含量提高,蛋白质和氨基酸品质有所改善。  相似文献   

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