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1.
冬小麦冠气温差及其影响因子研究 总被引：4，自引：1，他引：4
在冬小麦主要生育期，测定了3个不同水分处理冠层温度、气温、地面土壤温度以及土壤含水率和叶面积指数，计算了冠气温差和饱和差及相对湿度，并分析了冠气温差与土壤含水率和叶面积指数和饱和差及相对湿度间的关系。结果表明：不同的灌溉措施对冠气温差有显著的影响；14：00左右在冠层之上高度处的冠气温差能反映作物的水分特征，可以用此时刻的实测结果来检验遥感数据反演冠气温差的精度；在60～80 cm土层的土壤体积含水率能较好地反映14:00冠层之上冠气温差的变化情况，不同水分处理二者的关系显著，复相关系数分别为0.65809(节水灌溉)，0.99577(充分灌溉)，0.78206(不灌溉)；不同水分处理下的冬小麦主要生育期的叶面积指数与冠气温差相关性显著，冠层之上二者的相关系数分别为：0.76082(节水灌溉)，0.40548(充分灌溉)，0.99001(不灌溉)，这为区域遥感反演作物冠气温差来监测土壤含水率及作物估产提供了依据。 相似文献
2.
为探究作物冠层受阳光直射或阴影遮挡对无人机热红外遥感诊断作物水分胁迫、监测土壤含水率的影响，该研究以不同灌溉处理的夏玉米为研究对象，将热红外图像划分为光照冠层、阴影冠层、光照土壤、阴影土壤4个部分，分别提取光照温度与阴影温度后计算了11:00、13:00、15:00的冠气温差（冠层温度与大气温度之差，ΔT）、作物水分胁迫指数（crop water stress index，CWSI）、蒸发比（潜热通量与有效能量的比值，evaporative fraction，EF），并对比了3种指数在不同时刻使用光照温度（ΔTL、CWSIL、EFL）与阴影温度（ΔTS、CWSIS、EFS）后对土壤含水率的监测效果变化情况。结果表明：1）3种指数的监测效果会随时间发生变化，11:00与15:00时EF监测效果较好，13:00时CWSI监测效果较好，ΔT的监测效果较差但随时间波动最小；2）拔节期在区分光照温度与阴影温度后监测效果在11:00时提升幅度最大，EF、EFS、EFL的R2分别为0.54、0.65、0.78，CWSI、CWSIS、CWSIL的R2分别为0.47、0.64、0.70，抽雄期与灌浆期使用光照温度对监测效果提升不大，但使用阴影温度的指数监测效果有明显降低，在13:00时CWSIS较CWSI有最大降幅，R2降幅分别为0.11、0.06；3）在拔节期与抽雄期使用11:00的EFL，在灌浆期使用13:00的CWSI能取得最好的土壤含水率监测效果，预测土壤含水率的R2分别为0.75、0.75、0.89。该研究可以为无人机热红外监测土壤含水率提供参考。 相似文献
3.
夏玉米冠气温差及其影响因素关系探析 总被引：4，自引：0，他引：4
测定了夏玉米主要生育期四个不同水分处理的冠层温度、气温、土壤含水率、叶面积指数和株高,分析了冠气温差与土壤含水率、叶面积指数及株高间的关系。结果表明:不同的灌溉水质和灌溉量措施对夏玉米冠气温差有显著的影响;中午12~14时左右H1高度(2/3株高)处的冠气温差较H2高度(H1+50 cm)更能反映作物和土壤的水分特征,可以用此时刻的卫星遥感冠层温度结合地面气象站数据监测作物和土壤的旱情;80~100 cm土层的土壤体积含水率与节水灌溉处理的冠气温差之间存在良好关系(α=0.05),0~80 cm四个土层中以中午20 cm和40 cm处的土壤体积含水率与冠气温差相关关系最好且稳定,可以利用此关系评价作物的缺水状况;充足灌溉下的夏玉米主要生育期的叶面积指数与冠气温差也有显著的相关关系,节水灌溉下二者关系不显著,说明水分充足条件下叶面积指数对冠气温差的影响更大;株高与不同水分处理的冠气温差也有一定的相关关系,冠层2/3高度处二者的相关系数分别为:0.7027(淡水节水处理)、0.4150(淡水充足处理)、0.3683(咸水节水处理)、0.3062(咸水充足处理)。这为区域上遥感反演夏玉米冠气温差进而监测农田蒸散和土壤含水率提供了试验依据。 相似文献
4.
冠层—气温差监测和诊断冬小麦农田水分 总被引：8，自引：1，他引：8
以农田生态系统为研究单元，以ＳＰＡＣ的理论为基本原则，深入探讨了冠层－气温差与冬小麦农田土壤和作物水分状况的关系。在比较精确和连续的大田试验基础上，得出了冠层－气温差监测０￣５０ｃｍ土层相对含水量的模型及诊断冬小麦水分状况的指标，该模型和指标可直接用于指导灌溉。 相似文献
5.
土壤水分对夏玉米农田CO2通量和群体水分利用率的影响 总被引：6，自引：0，他引：6
利用ＣＯ2分析系统,配合波文比装置,在夏玉米全生育期连续测定农田冠层瞬时ＣＯ2浓度差及农田小气候特征量,并计算了农田冠层瞬时ＣＯ2通量密度、潜热通量和群体水分利用率。结果表明,群体光饱和点位移是受土壤水分影响的一个辐射能量范围,充沛的太阳辐射能量只有充足水分条件的耦合,才能发挥生产力效益;群体水分利用率与０～６０ｃｍ土层土壤平均相对含水率呈负相关,土壤相对含水率在３０.３％～８０％范围内,水分利用率随相对含水率的增加而降低。 相似文献
6.
为解决无人机遥感领域根据冠层光谱信息对猕猴桃果树根系土壤含水率（root soil water content, RSWC）进行反演时,现有算法对冠层图像信息分析不足的问题,该研究对传统卷积神经网络模型进行改进,提出一种复合视觉卷积回归神经网络（compound visual convolutional regression network, CVCRNet）,该网络复合两种不同尺寸卷积层对图像数据进行卷积特征提取,并使用全连接层对卷积特征值进行降维,从而直接以多光谱图像为分析对象对RSWC进行反演,充分利用多光谱图像内所有数据,提升反演精度。研究采集徐香猕猴桃果树果实膨大期（5—9月）冠层多光谱信息和深度40 cm处的RSWC,把基于图像的CVCRNet网络反演方法与基于植被指数的传统反演方法进行对比,CVCRNet训练结果在验证集R2为0.827,RMSE为0.787%,相较于传统方法在验证集R2为0.759,RMSE为0.983%,反演结果相关性有了明显提升,准确率也有得到一定提高。结果表明,改进后的CNN网络能够作为冠层信息反演的重要工具,在冠层复杂的场景下达成良好的土壤数据反演效果。 相似文献
7.
表层有效土壤水分参数化及冠层下土面蒸发模拟 总被引：1，自引：7，他引：1
通过观测田间微气象数据、土壤表层水分变化状况及荞麦作物冠层下土面蒸发等资料,引进一个表面体积含水率的函数,构建了基于表层有效土壤水分的土壤蒸发模型。该模型包含了土面蒸发的2个过程:水蒸气从土壤孔隙中扩散到地表面及水蒸气由地表面传输到大气中。模型中表层有效土壤水分参数不仅取决于表层土壤含水状况,而且受风速影响。采用波文比能量平衡法及微型蒸发器观测荞麦地实际蒸腾蒸发量及冠层下土面蒸发的变化规律,并验证模型精度。结果表明,所构建模型可以成功预测冠层下土面蒸发,其平均相对误差为13.5%。该研究对于实现土壤蒸发及作物蒸腾的分离估算,减少无效水分消耗具有重要意义。 相似文献
8.
长江中下游地区夏季温室黄瓜冠层温度模拟与分析研究 总被引：3，自引：0，他引：3
根据作物冠层能量平衡原理，建立了以温室内温度、湿度、冠层净辐射等为变量的温室作物冠层温度的模拟模型，并利用实测资料对模型的可靠性进行了检验，同时就温室内部温度、冠层净辐射、蒸腾速率对冠层温度的影响进行了敏感性分析。结果表明：模型能较好地预测长江中下游地区温室作物冠层温度，模型对该地区夏季(2002年6月24至7月12日，梅雨季节)温室内作物冠层温度预测值与实测值的决定系数(R2)和标准误(SE)分别为：0.8321，0.0037℃；建立的温室内部温度、相对湿度、净辐射和作物蒸腾速率的多元线性回归模型，其决定系数(R2)和标准误(SE)分别为：0.9996，0.8829℃；通过敏感性解释因子的分析表明，作物冠层温度对温室内部温度最为敏感，室内温度是预测冠层温度的主要因子。 相似文献
9.
基于无人机热红外图像的核桃园土壤水分预测模型建立与应用 总被引：2，自引：1，他引：1
为了解北方核桃园区的土壤水分状况,实现优化水资源配置的目的。该文于2016和2017年采用固定式热红外成像仪(A310 f)连续观测得到核桃主要生长季节午后(13:00和14:00)的冠层温度,并同步观测温度、湿度、辐射、风速、降雨量和0~80 cm不同土层深度的土壤体积含水量。并于2017年8月11日利用无人机热成像系统(TC640)对连续灌溉区域和干旱胁迫区域进行了图像采集。结果表明,40~60 cm土层深度可能是核桃树主要吸收水分的区域。冠层温度普遍高于空气温度,其变化范围在0~5℃之间,冠气温差与土壤含水量呈负相关,与太阳辐射呈正向关系,其中,土壤含水量的贡献值达到了75%。利用2017年13:00时的冠层与空气温差数据来建立的土壤水分预测模型,R2=0.64;同时,利用14:00时的实测数据对所建立模型进行验证,R2=0.61,表明该模型具有一定的拟合精度。最后,将模型用于诊断核桃区域水分状况,证明了其具有较好的实际应用效果。该研究首次将固定式热成像设备与无人机热成像系统相结合来研究树木的冠层温度,并成功实现了从理论模型到实际应用,从单株水平到区域尺度的转换。 相似文献
10.
黄淮冬麦区晚霜冻易发时段冠层内最低气温分布及估算 总被引：1，自引：0，他引：1
利用2016年和2017年3月中旬?4月下旬两次典型低温过程中,冬小麦田间不同高度逐小时气象观测数据,分析晚霜冻易发时段冬小麦冠层内最低气温出现高度及其变化规律,构建基于150cm高度处气象因子和地表0cm温度的冠层内最低气温估算模型。结果表明：（1）与150cm高度相比,两次典型低温过程中0℃以下气温在冠层高度附近出现时间更早,持续时间更长且温度更低;（2）最低气温总是出现在4/5冠层高度附近,并在2：00?6：00时段,尤以5：00左右发生频率最高;（3）冠层内最低气温与150cm高度处相对湿度、风速的相关性通过了0.01水平的显著性检验,与不同高度气温、不同土壤深度地温的相关性也通过了0.001水平的显著性检验,与地温的相关性随着土壤深度的增加而逐渐降低;（4）冠层内最低气温与150cm高度处气温、风速、相对湿度,以及0cm地温的偏相关系数大小排序表现为,气温＞风速＞地温＞相对湿度;利用以上因子构建基于多元线性回归函数的冠层内最低气温估测模型,其估测值与实测值拟合结果的决定系数达到0.967,均方根误差为0.915。说明基于气象台站常规观测数据构建冠层内最低气温估测模型具备一定可行性,可为冬小麦晚霜冻害的监测预报提供数据支持。 相似文献
11.
【目的】以富士（Fuji）、 秦冠（Qinguan）嫁接在平邑甜茶（Malus hupehensis Rehd.）上的当年生盆栽苗为试验材料,采用砂培方法,研究了缺氮胁迫和干旱对富士和秦冠生长情况、 光合参数、 植株各部位氮磷钾含量及氮素利用效率的影响,分析比较了低氮干旱条件下富士和秦冠生长及氮素利用的差异,以期为果树生产高效肥水利用提供理论指导。【方法】试验共设四个处理: 正常氮正常水（ZZ）、 低氮正常水（DZ）、 正常氮干旱（ZG）、 低氮干旱（DG）。氮素和水分均设置两个水平,分别为正常氮（6 mmol/L NO-3-N）、 低氮（0.3 mmol/LNO-3-N）、 正常供水（保持盆中砂子相对含水量为饱和含水量的80%~85%）、 干旱处理（保持盆中砂子相对含水量为饱和含水量的60%~65%）。【结果】富士和秦冠的生物量（茎和叶）、 株高茎粗等生长指标以及光合速率、 气孔导度、 蒸腾速率均为正常氮正常水（ZZ）＞低氮正常水（DZ）＞正常氮干旱（ZG）＞低氮干旱（DG）,并且相对应处理下秦冠的以上指标均高于富士;正常供水下,缺氮处理使富士、 秦冠的根冠比比正常氮处理均有所增加,富士提高了2.05%,秦冠提高了22.40%。富士和秦冠的氮、 磷、 钾含量均表现出正常氮正常水（ZZ）＞低氮正常水（DZ）＞正常氮干旱（ZG）＞低氮干旱（DG）; 氮、 钾元素含量在植株各部位的分布顺序依次是叶＞根＞茎,磷元素则是根＞叶＞茎;光合氮素利用效率（PNUE）和氮素利用效率表现为秦冠处理之间差异极显著,富士处理之间差异不显著;秦冠的PNUE和NUE明显高于富士,在低氮正常水（DZ）处理下,秦冠氮肥利用率比富士高42.07%,在低氮干旱（DG）处理下高64.14%;低氮胁迫下富士和秦冠的NUE显著提高,并且秦冠提高的幅度高于富士。【结论】施用氮肥能够显著提高富士与秦冠的干物质量,同等水肥条件下,秦冠生长优于富士;水分亏缺会减少叶片对氮的吸收,干旱条件下适度增施氮肥,可提高果树的抗旱能力;低氮干旱胁迫下秦冠的生长指标、 光合指标及氮素利用效率指标均优于富士,表现出较强的抗低氮干旱胁迫的能力。 相似文献
12.
Kyle Devey Michael Mucalo Gordon Rajendram Joseph Lane 《Communications in Soil Science and Plant Analysis》2015,46(4):72-80
Laser-induced breakdown spectroscopy (LIBS) is a new technique for the analysis of plant material. This study investigates the application of LIBS to pasture-based plant samples. The LIBS measurements were obtained from pelletized pasture samples (100 samples) that had been also analyzed by inductively coupled plasma–optical emission spectroscopy (ICP-OES) following microwave digestion for calibration and comparison purposes. Comparisons for elements sodium (Na), potassium (K), magnesium (Mg), calcium (Ca), manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), boron (B), phosphorus (P), and sulfur (S) showed that LIBS could be used for almost all the standard profile total elements with concentrations down to low mg/kg levels (observed error of Na: 0.024 percent, K: 0.18 percent, Mg: 0.016 percent, Ca: 0.073 percent, P: 0.017 percent, Mn: 31 mg/kg, Fe: 150 mg/kg, Zn: 6.6 mg/kg, and B: 1.1 mg/kg). Elemental analysis at less than mg/kg levels was not possible using LIBS. The elements S and Cu were particularly difficult to analyze with reliability using LIBS at the concentration levels found in the plant samples. Replacing microwave digestion and subsequent ICP analysis with a direct analysis of dried plant samples using LIBS has the potential to improve the productivity and reduce the cost of testing. 相似文献
13.
《中国生态农业学报》2014,(8)
正The Center for Agricultural Resources Research(CARR),the Institute of Genetics and Developmental Biology(IGDB),Chinese Academy of Sciences,invites applicants for several research group leader positions.CARR is one of the research organizations in Chinese Academy of Sciences(CAS).We seek nominations and applications from individuals who have expertise and a record of accomplishment in research areas related to ecology,agro-hydrology, 相似文献
14.
M.A. Callaham Jr. J.M. BlairT.C. Todd D.J. KitchenM.R. Whiles 《Soil biology & biochemistry》2003,35(8):1079-1093
The responses of tallgrass prairie plant communities and ecosystem processes to fire and grazing are well characterized. However, responses of invertebrate consumer groups, and particularly soil-dwelling organisms, to these disturbances are not well known. At Konza Prairie Biological Station, we sampled soil macroinvertebrates in 1994 and 1999 as part of a long-term experiment designed to examine the effects and interactions of annual fire, mowing, and fertilization (N and P) on prairie soil communities and processes. For nearly all taxa, in both years, responses were characterized by significant treatment interactions, but some general patterns were evident. Introduced European earthworms (Aporrectodea spp. and Octolasion spp.) were most abundant in plots where fire was excluded, and the proportion of the total earthworm community consisting of introduced earthworms was greater in unburned, unmowed, and fertilized plots. Nymphs of two Cicada genera were collected (Cicadetta spp. and Tibicen spp.). Cicadetta nymphs were more abundant in burned plots, but mowing reduced their abundance. Tibicen nymphs were collected almost exclusively from unburned plots. Treatment effects on herbivorous beetle larvae (Scarabaeidae, Elateridae, and Curculionidae) were variable, but nutrient additions (N or P) usually resulted in greater densities, whereas mowing usually resulted in lower densities. Our results suggest that departures from historical disturbance regimes (i.e. frequent fire and grazing) may render soils more susceptible to increased numbers of European earthworms, and that interactions between fire, aboveground biomass removal, and vegetation responses affect the structure and composition of invertebrate communities in tallgrass prairie soils. 相似文献
15.
Grete Skrede Berit Karoline Martinsen Anne-Berit Wold Stein-Erik Birkeland Kjersti Aaby 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(3):193-208
Abstract A 3-year study was carried out to investigate quality parameters in 14 tree fruit and berry species grown in southern Norway. The species were blueberry, apple, aronia, sour cherry, sweet cherry, red raspberry, strawberry, blackcurrant, gooseberry, red currant and elderberry, harvested along with wild bilberry, cloudberry and lingonberry. Significant differences between species were identified for all quality parameters. The coefficient of variation between species was lowest for pH (12.5%), dry matter (18.9%) and soluble solids (25.3%), followed by titratable acids (59.3%), total phenolics (83.8%), antioxidant capacity FRAP (85.7%) and antiradical power by the DPPH-assay (97.8%), total monomeric anthocyanins (132%) and ascorbic acid (137%). Average coefficient of variation within species were lower and ranged from 4 (pH) to 62% (ascorbic acid). Only the FRAP values were significantly affected by harvesting year with lower levels in 2004 than in 2005 and 2006. There were significant interactions between species and harvesting year for dry matter, soluble solids, pH, ascorbic acid and FRAP. The results indicate generic ranges in composition within species independent upon growing location and climate, and the composition of the tree fruits and berries is not likely to deviate from these ranges. It is concluded that desirable composition of tree fruits and berries and their products should primarily be achieved by selection among species rather than searching fors broadened variation within individual species. 相似文献
16.
《Communications in Soil Science and Plant Analysis》2012,43(7):865-877
Potassium (K) fixation and release in soil are important factors in the long-term sustainability of a cropping system. Changes in K concentration and characteristics of K fixation and release in rhizosphere and nonrhizosphere soils in the rapeseed (Brassica napus L.)–rice (Oryza sativa L.) rotation were investigated using a rhizobox system. The concentrations of different forms of K in both rhizosphere and nonrhizosphere soils decreased with plants compared to without plants, regardless of K fertilizer application. Potassium uptake by crops mainly came from the rhizosphere soil. In the treatment without K fertilizer (–K), the main form of K supplied by the soil to the crops was 1.0 mol L?1 nitric acid (HNO3) nonextractable K, followed by nonexchangeable K, and then exchangeable K. In the treatment with K fertilizer (+K), the main K forms supplied by the soil to the crops were exchangeable K and nonexchangeable K. The amount and rate of K fixation after one cycle of the rapeseed–rice rotation was greater in rhizosphere soil than in nonrhizosphere soil. The amount and rate of K fixation of soil in the +K treatment were significantly less than in the –K treatment. The cumulative amounts of K released with 1.0 mol L?1 ammonium acetate (NH4OAc) and 1.0 mol L?1 HNO3 extraction increased with the increasing numbers of extractions, but the K-releasing power of soil by successive extraction decreased gradually and finally became almost constant. The release of K was less in rhizosphere soil than in nonrhizosphere soil. The release of K in the +K treatment was similar to that in the –K treatment in rhizosphere soil, but the K release in nonrhizosphere soil was greater with the +K than the –K treatment. Overall, the information obtained in this study will be helpful in formulating more precise K fertilizer recommendations for certain soils. 相似文献
17.
Electron donor and pH relationships for biologically enhanced dissolution of chlorinated solvent DNAPL in groundwater 总被引：3，自引：0，他引：3
Biologically enhanced dissolution offers a method to speed removal of chlorinated solvent dense non-aqueous-phase liquid (DNAPL) sources such as tetrachloroethene (PCE) and trichoroethene (TCE) from aquifers. Bioremediation is accomplished by adding an electron donor to the source zone where fermentation to intermediates leading to acetic acid and hydrogen results. The hydrogen and possibly acetic acid are used by dehalogenating bacteria to convert PCE and TCE to ethene and hydrochloric acid. Reductive dehalogenation is thus an acid forming process, and sufficient alkalinity must be present to maintain a near neutral pH. The bicarbonate alkalinity required to maintain pH above 6.5 is a function of the electron donor: 800 mg/L of bicarbonate alkalinity is sufficient to achieve about 1.2 mM TCE dechlorination with glucose, 1.7 mM with lactate, and a much higher 3.3 mM with formate. Laboratory studies indicate that in mixed culture, formate can be used as an electron donor for complete conversion to ethene, contrary to pure cultures studies indicating it cannot. Various strategies can be used to add electron donor to an aquifer for DNAPL dehalogenation while minimizing pH problems and excessive electron donor usage, including use of injection-extraction wells, dual recirculation wells, and nested injection-extraction wells. 相似文献
18.
Aleš Lebeda Ivana Doležalová Eva Křístková Barbora Mieslerová 《Genetic Resources and Crop Evolution》2001,48(2):153-164
Staff members of the Department of Botany of Palacký University in Olomouc and Gene Bank Department – Workplace Olomouc, Research Institute of Crop Production in Prague, Czech Republic, conducted an expedition in seven European countries (Austria, Czech Republic, France, Germany, Italy, the Netherlands, Switzerland) in August/September 1999 to collect wild Lactuca spp. germplasm and study its geographic distribution, ecology and biodiversity. During the mission, more than 600 locations were visited resulting in the collection of 602 seed samples (accessions) of wild Lactuca species and 13 seed samples of related genera (Chondrilla and Mycelis). Lactuca serriola f. serriola, L. serriola f. integrifolia, L. saligna and L. viminea subsp. chondrilliflora were prevalent in southern Europe (Italy, France), however, only L. serriola was common in central and western Europe (Austria, Czech Republic, Germany, Netherlands, Switzerland). The greatest diversity of Lactuca species was found in France, where also the most seed samples (165) were collected. The most characteristic habitats with a high density of Lactuca spp. populations were observed along roads and highways, grassy ditches, ruderal communities, and dust-heaps. Natural infections by powdery mildew (Erysiphe cichoracearum) and downy mildew (Bremia lactucae) on some wild Lactuca spp. were observed. Recent observations concerning the geographic distribution, population structure, habitats, and natural occurrence of diseases of Lactuca spp. are discussed. This assemblage of genetic resources of Lactuca spp. can serve as the basis of future studies of species diversification, spatial population structure, plant microevolution, domestication processes, and genetic variability of host-parasite interactions. 相似文献
19.
Three slow-growing legume trees used for desert reforestation and urban gardening in the Sonoran Desert of Northwestern Mexico
and the Southwestern USA were evaluated whether their growth can be promoted by inoculation with plant growth-promoting bacteria
(Azospirillum brasilense and Bacillus pumilus), unidentified arbuscular mycorrhizal (AM) fungi (mainly Glomus sp.), and supplementation with common compost under regular screenhouse cultivation common to these trees in nurseries. Mesquite
amargo (Prosopis articulata) and yellow palo verde (Parkinsonia microphylla) had different positive responses to several of the parameters tested while blue palo verde (Parkinsonia florida) did not respond. Survival of all tree species was over 80% and survival of mesquite was almost 100% after 10 months of cultivation.
Inoculation with growth-promoting microorganisms induced significant effects on the leaf gas exchange of these trees, measured
as transpiration and diffusive resistance, when these trees were cultivated without water restrictions. 相似文献
20.
Y. Bashan J. J. Bustillos L. A. Leyva J.-P. Hernandez M. Bacilio 《Biology and Fertility of Soils》2006,42(4):279-285
Inoculation of wheat seedlings with the plant growth-promoting bacterium Azospirillum brasilense Cd was immobilized in alginate microbeads and, without applying any stress, significantly increased the quantity of several
photosynthetic pigments, such as chlorophyll a, chlorophyll b, and the auxiliary photoprotective pigments violaxanthin, zeaxanthin, antheroxanthin, lutein, neoxanthin, and β-carotene.
This resulted in greener plants with no apparent visible stress. After monitoring the quantity of photosynthetic pigments
for 4 weeks, we observed that inoculated plants had higher quantities of pigments in shoot and stem. The greatest difference
in the quantity of all pigments between inoculated and noninoculated plants occurred in the first week of growth. Regardless
of treatment, the quantity of pigments in stems was three to four times less than the quantity of these pigments in shoots.
Application of Azospirillum, either as liquid inoculant or as alginate microbeads, did not alter the positive effect of the bacteria on pigment production
or the positive response of the plants towards A. brasilense Cd inoculation. 相似文献