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1.
克里雅河绿洲在空间分布上几乎与于田县行政区划中的人居区域相吻合。利用于田县经济增长和生态环境数据,构建绿洲经济增长和生态环境的指标体系,运用熵权法得到绿洲经济增长综合指数和生态环境综合指数,通过相关系数分析和耦合协调度模型对绿洲经济增长与生态环境耦合协调进行分析。结果表明:1)克里雅河绿洲经济增长和生态环境综合指数都呈上升的趋势,但经济发展综合指数的增长趋势大于生态环境综合指数的增长趋势。2)克里雅河绿洲经济增长和生态环境综合指数的关系相对密切,经济增长和生态环境的协调度C围绕起均值0.4954上下波动,调和指数T和耦合协调度D总体呈上升趋势。3)耦合协调度变化量ΔD和环比增长率r在小波动中呈现增长趋势。 相似文献
2.
利用2009~2013年相关数据,在城市生态环境与农村生态环境耦合协调关系评价指标体系构建的基础上,运用熵权法确定指标权重,同时引入耦合度与耦合协调度模型,定量计算云南城市生态环境与农村生态环境的耦合度与耦合协调度,并结合耦合度阶段与协调度类型划分标准对两者间的耦合协调关系进行定量评价。研究表明:从综合指数看,云南城市生态环境综合指数波动较大,农村生态环境综合指数变化比较平稳,且城市生态环境综合指数增幅小于农村生态环境综合指数增幅;从耦合度看,云南出现由农村生态环境滞后向城市生态环境滞后的转变,城市生态环境与农村生态环境耦合度经历了从磨合阶段到高水平耦合阶段的变化,两系统间的发展方向越趋有序,关系越趋稳定;从协调度看,云南城市生态环境与农村生态环境协调度呈上升趋势,耦合协调类型从低度协调转变为中度协调并最终呈现良好协调的发展态势。 相似文献
3.
[目的]构建宁夏回族自治区固原市原州区生态环境系统和社会经济系统之间的耦合度和耦合协调度模型,以期为区域的协调发展调控提供科学依据。[方法]基于固原市原州区2002—2016年生态环境和社会经济的数据,构建原州区区域生态系统指标评价体系,采用熵值赋权法计算各个评价指标的权重以及综合评价指数,通过建立耦合度、耦合协调度模型和灰色预测度模型,得到并预测该区域生态环境系统和社会经济系统的耦合度和耦合协调度发展趋势以及耦合协调类型。[结果] 2002—2016年,固原市原州区社会经济系统评价指数稳定上升,受生态环境压力的影响,生态系统综合评价指数呈现先下降后波动上升的趋势,前者的发展速度快于后者;耦合度和耦合协调度不断上升,耦合协调类型从经济滞后中度失调型发展为生态环境滞后的濒临失调型;通过模型预测,2017—2025年生态环境系统和社会经济系统之间耦合度及耦合协调度将逐渐升高,耦合协调类型会不断向理想状态发展。[结论]固原市原州区由于经济发展水平快于生态环境建设力度,从而制约了该区域整体的协调发展。因此为实现原州区区域生态系统的可持续发展。还需大力加强对生态环境的建设。 相似文献
4.
[目的]开展生态环境与贫困的耦合分析,为生态脆弱区的精准扶贫和可持续发展提供科学建议。[方法]以典型生态脆弱区——四川省藏区为例,采用耦合度与耦合协调度模型,对2008—2017年四川省藏区生态环境与贫困耦合状况进行动态定量分析和测度。[结果]①2008—2017年四川省藏区生态环境与贫困耦合发展呈现较低水平的平稳态势,耦合度数值维持在0.072 2～0.706 3之间,且表现逐年上升的变化趋势,2011年则波动下降。②2008—2017年四川省藏区生态环境指数呈逐年递增态势,数值维持在0.0295～1.000 0之间。且贫困指数也呈逐年增加趋势,数值维持在0.006 3～0.995 4之间,但2011年则波动下降。③除2011年波动下降外,2008—2017年四川省藏区生态环境与贫困耦合协调度呈逐年增加趋势,耦合协调度维持在0.035 9～0.839 4之间,且耦合协调度与耦合度变化趋势基本一致。④2008—2017年四川省藏区生态环境与贫困耦合协调度呈现低水平耦合发展、耦合过渡提升至高水平耦合协调贫困滞后3个不同阶段。[结论]未来四川省藏区应以生态保护与贫困减缓为关键点和突破点,以实现生态脆弱区社会经济和环境系统的可持续发展。 相似文献
5.
西安市城市化与城市生态环境耦合协调发展研究 总被引：3，自引：0，他引：3
以西安市为例,构建了城市化水平综合指标体系和生态环境综合指标体系,并应用灰色关联度模型及耦合协调度模型对二者关系进行了研究。结果表明:①1996—2010年,西安市城市化水平综合得分不断提高;②西安市生态环境综合水平呈现波动中向良性方向发展的态势;③灰色关联度分析表明,人均耕地面积等生态环境压力指标是影响西安市城市化的最主要因素,而人口密度等社会经济城市化指标是胁迫生态环境的主要原因;④西安市城市化与城市生态环境耦合度的时序变化表现出明显的波动性,耦合度以颉抗阶段为主,耦合协调度基本处于中高度协调水平。 相似文献
6.
宁夏六盘山连片特困区生态环境与经济发展耦合协调研究 总被引：1，自引：0，他引：1
以宁夏六盘山贫困地区为例,建立了耦合协调度评价指标体系,综合运用熵权法、耦合协调度模型以及地理探测器等方法对研究区2006—2016年生态环境与经济发展耦合协调度做出了时空变化分析。结果表明:（1）研究期间,宁夏六盘山生态环境与经济发展耦合度和耦合协调度呈现同步稳定增长的变化态势,生态环境与经济发展耦合度和协调度指数呈现出先减后增的变化趋势,说明生态系统与经济系统之间相互作用程度不断增强,内部协调程度进一步提升。（2）从空间分异来看,耦合协调低值区主要分布在经济发展落后且生态环境质量较差的西北和南部地区,高值区主要分布在经济发展水平、城市化水平较高的行政中心区域,耦合协调度由西北向东南呈现出低—高—低的空间分布格局;耦合协调度高、低值区的分布主要受经济发展水平、城市化水平、资源禀赋等条件的限制。（3）基于地理探测器探测影响耦合协调度空间分异因素的结果可知:人均GDP、GDP增长率、农村人均纯收入、森林覆盖率、建成区绿化覆盖率、人均公园绿地面积、环保投资额占GDP比重、人均牧草地面积和人均水资源量等因子的q值均大于0.9,是影响六盘山区生态环境与经济发展耦合协调度空间分异的主导因素,也是区域经济发展和生态建设过程中应关注的重要因素。 相似文献
7.
宁夏回族自治区生态环境与经济发展耦合协调研究 总被引：3，自引：0，他引：3
为了研究区域生态环境与社会经济协调发展状况,以宁夏回族自治区为例,通过构建评价指标体系,综合运用熵权法、耦合协调度模型、剪刀差方法以及耦合度模型对宁夏生态环境与社会经济发展状况、耦合协调水平以及耦合度演化趋势进行了综合分析。结果显示:研究期间宁夏生态环境系统综合发展指数呈波动上升的变化趋势,社会经济发展水平逐年上升;耦合协调指数由0.3225上升至0.5962,说明区域生态环境与社会经济的关系不断缓和,趋向于协调发展;剪刀差呈先减后增的“U”型变化趋势,说明两系统发展差异呈先减小后增大的变化态势;宁夏生态环境与社会经济发展耦合度介于(45°,90°],说明两系统处于协调发展阶段,而耦合度整体呈上升态势,说明经济发展与生态环境之间的矛盾开始显现。基于耦合模型所建立的耦合协调度,较好地反映了宁夏生态环境与社会经济之间交互胁迫的耦合发展过程,对于正确认识宁夏生态与经济系统耦合发展规律,促进宁夏生态与经济协调发展具有重大意义。 相似文献
8.
宁南山区生态环境与社会经济的耦合协调发展 总被引：2，自引：1，他引：1
[目的] 研究宁南山区生态环境与经济系统的协调发展状况,为该区可持续发展提供科学依据。[方法] 以宁南山区为研究区,基于该区9个县的各项生态与经济基本指标,构建自然生态系统与社会经济系统指标体系,使用熵值法确定各指标权重,计算自然生态系统和社会经济系统综合指数。在此基础上,利用耦合度模型和耦合协调度模型分析社会经济系统与生态环境系统的耦合协调状态以及演变趋势。[结果] ①在2000—2017年,宁南山区各县社会经济发展水平逐步上升,自然生态系统综合指数整体呈波动下降趋势。②宁南山区各县耦合度呈现先上升后稍有下降的趋势,但整体范围保持在[0.89,1] ,处于较高水平。③宁南山区耦合协调度类型属于协调发展类。2015—2017年盐池县的协调度有所下降,同心县的协调度上升程度较低,其余县均保持上升趋势。[结论] 近些年,随着经济水平的提高,宁南山区生态环境承载力逐渐不能适配其快速发展的社会经济,生态与经济之间的矛盾逐渐显露。耦合协调度模型较好地反映了宁南山区生态环境与社会经济之间交互胁迫的发展过程,为正确认识宁南山区生态与经济系统耦合发展规律提供了依据。 相似文献
9.
《水土保持研究》2020,(4)
为了阐释西安市土地利用效益与城镇化的耦合协调机理,明确二者的耦合协调程度,通过构建土地利用效益与城镇化水平指标体系和评价模型,计算了土地利用效益与城镇化水平评价指数、耦合协调度以及灰色关联度,剖析了二者的耦合协调发展关系和相互影响程度。结果表明:(1) 2005—2015年西安市土地利用效益指数、城镇化指数以及综合评价指数逐年增长,两者在发展中相互促进,土地利用效益指数增长速度略大于城镇化指数,经济效益在土地利用效益中占据主导地位,经济、生态城镇化指数在城镇化水平指数中占比最大;(2)土地利用效益与城镇化的耦合协调度逐年递增,耦合协调阶段由失调衰退阶段最终转变为协调发展阶段,耦合协调状态由濒临失调转变为优质协调,两者的协调发展关系更加紧密;(3)土地利用效益与城镇化水平之间存在相互影响的关系,经济效益以及生态效益对城镇化水平的影响程度较高,经济城镇化、生态城镇化、社会城镇化以及教育城镇化对土地利用效益均有较为重要的影响;(4)土地利用效益与城镇化是两个相互促进、紧密相关的协调发展系统,在推动经济社会不断发展的同时,也要加强生态环境保护以及合理规划城市用地,实现土地利用效益与城镇化协调发展。 相似文献
10.
[目的] 探索河南省城市化与生态环境耦合协调状态的空间聚集特征,提出相关的发展建议,为河南省城市可持续发展提供科学的参考。[方法] 通过构建城市化与生态环境评价体系,利用改进的耦合协调度模型,研究2008—2018年河南省城市化与生态环境发展水平及耦合协调度,对河南省17个地级城市耦合协调度进行时空格局分析。[结果] 2008—2018年全省耦合度值都在0.9以上,耦合协调度呈波动上升趋势;多数城市的城市化水平低于生态环境水平,各市城市化与生态环境的耦合协调度等级有基本不协调、基本协调、协调、高级协调;城镇化与生态环境耦合协调存在空间正相关性,有西部和中部耦合协调度高、东南部耦合协调度低的聚类特征。[结论] 河南省整体城镇化进程加快,经济城市化和生态环境压力分别对城市化和生态环境两大系统产生了重要影响。应加强郑州市中心城市的发展,推动河南东南部城市的发展。 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.
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
20.
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