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1.
了解区域土地资源的禀赋是合理组织土地资源利用的前提和基础,探讨土地资源禀赋的评价并对具体区域的土地资源禀赋进行研究具有十分重要的理论与现实意义。基于2001年-2014年陕西省农用地利用及国民经济发展相关数据,以陕西省11个地市农用地资源为研究对象,从农用地数量、质量、结构和效益4个维度构建指标体系评价陕西省农用地资源禀赋度并揭示其演变过程和空间分异特征。结果表明:（1）陕西省农用地资源禀赋总体发展趋势呈先下降后上升状态且等级格局变动明显,下降幅度最大的是商洛市,上升幅度最大的是铜川市,杨凌示范区农用地资源禀赋度在研究时段内保持最高。（2）陕西省农用地资源禀赋空间分异显著且与陕西省自然地理分区呈耦合关系,关中地区的农用地资源禀赋度最高,其次是陕北地区,陕南地区最低。今后应根据区域特点,采取针对措施,提高区域农用地资源禀赋。 相似文献
2.
基于粒子群优化投影寻踪模型的区域土地资源承载力综合评价 总被引：13，自引：3，他引：10
为了解决土地资源承载力评价中指标权重赋值客观性差的问题,提出了基于粒子群优化投影寻踪模型的土地资源承载力评价方法,并将其应用于2008年三江平原土地资源承载力综合评价中,结果表明,该方法不仅可有效避免指标赋权时的主观任意性,而且评价结果与实际相符,方法可行有效。评价结果显示,2008年三江平原区域整体土地资源承载力综合评价值为2.621,土地资源的利用对社会的发展和生态环境的保护支撑能力较强,但其对经济技术发展的保障程度较差;三江平原区域内各市县土地资源承载力差异较为显著,应结合区域资源特点,制定科学合理的土地开发利用方案和社会经济发展战略。 相似文献
3.
河南省土地资源承载力时空演变分析与预测 总被引：1，自引：0，他引：1
《水土保持研究》2020,(2)
为了探究土地资源的合理人口承载量,依据2000—2016年河南省相关数据,运用粮食生产波动指数模型、土地资源承载指数模型、土地资源限制度模型和灰色预测模型GM(1,1),借助ArcGIS软件对河南省总体和分地市土地资源承载力进行动态分析,并对河南省分地市2017—2026年土地资源承载力进行了预测。结果表明:(1) 2000—2016年,河南省总体土地资源承载指数呈现下降趋势,土地资源承载力由平衡有余转变至富裕级别。(2) 2000—2016年河南省分地市中,人口超载类型区集中在豫西山区(三门峡、洛阳和平顶山)以及经济相对发达的郑州和济源;17年间,土地资源承载指数均呈现出"西高东低"的特征;2016年与2000年相比,河南省各地市中土地资源限制度较低的地市数和人口数均减少明显,不受土地资源限制的地市数量增多,其中省会郑州的土地资源限制度由轻度转向中度,呈现恶化趋势,需单独关注。(3) 2017—2026年河南省除郑州和三门峡人口超载外,其余地市的土地资源承载力均呈现逐年上升的趋势,粮食盈余类型区的地市数量稳定,且盈余级别不断优化,表明区域土地资源承载力将会逐步增强,在未来仍满足经济发展需要和具备向省内外人口超载区域大量输出粮食的条件和基础。 相似文献
4.
内蒙古中部城市土地利用绩效及其障碍因素 总被引：3，自引：1，他引：2
[目的]评价内蒙古中部城市土地利用绩效,并分析其障碍因子,为提高该地区土地利用效率,合理调配和利用土地资源提供科学依据。[方法]结合中国西北部地区自然环境特点,从土地利用结构、土地利用程度和土地利用效益3个方面构建内蒙古中部呼包鄂3个城市土地利用绩效评价体系;运用TOPSIS方法和障碍度模型测算2004—2013年呼包鄂城市的土地利用综合、单项绩效水平和影响呼包鄂土地利用绩效障碍因子。[结果]2004—2013年内蒙古中部城市呼包鄂的土地利用综合绩效总体呈上升趋势,但土地利用绩效具有明显的差异性,呼和浩特市上升较快,包头市较平稳,颚尔多斯市较慢;土地利用结构和土地利用社会效益是主要的障碍因子。[结论]内蒙古中部城市土地利用综合绩效与目标区域的资源禀赋及政策实施密不可分,应加大土地的资本投入,加强城市公共设施建设和土地利用的社会效益,完善和优化土地利用结构以及提高土地利用深度和广度;同时,内蒙古中部城市之间有着密切的经贸和社会联系,其土地利用应从一体化角度去完善,形成产业聚集,促进整体的土地资源优化。 相似文献
5.
山东省土地适宜性空间分析及其优化配置研究 总被引：28，自引：7，他引：21
基于山东省自然、社会、经济统计资料及图形资料,运用GIS地理空间分析方法,对山东省土地适宜性进行评价,同时对区域土地资源自然质量指数、土地资源综合适宜度、相对适宜度进行研究。通过对适宜评价图和利用现状图的空间叠加,计算、分析了待调整土地资源的多度及重要值。以土地资源空间分析为基础,多度、重要值为依据,进行土地资源空间优化配置。结果表明,优化后农用地减少10994.82 hm2,林牧用地增加13083.56 hm2,未利用地减少1438.83 hm2。 相似文献
6.
福建省土地利用隐性形态与土地生态安全耦合协调分析 总被引：1，自引：1，他引：0
《水土保持研究》2020,(4)
为了摸清土地利用形态转型的规律,促进绿色经济的发展,以福建省9个设区市为研究对象,采用综合指数模型、耦合协调度模型和地理探测器方法,探讨了福建省土地利用隐性形态时空特征、转型模式并分析其与土地生态安全的耦合协调性特征。结果表明:福建省土地利用隐性形态指数总体呈上升趋势,形态上逐渐往高级发展,沿海城市土地利用隐性形态指数比内陆城市高。研究期内土地利用转型存在阶段性特征,在一定周期内呈现出"S型"的演化态势。土地生态安全水平总体呈波动上升态势,并与地区所处的土地隐性转型模式密切相关,西北内陆地区土地生态水平总体比东南沿海地区高。近15年来福建土地利用隐性形态与土地生态安全耦合协调度均值由0.44上升至0.61,沿海城市协调性高于内陆城市;协调性差异的主要影响因素是土地利用强度、土地产出效益和生态资源禀赋。应当将土地利用隐性形态转型及其与生态安全的协调发展规律应用到土地利用中,因地制宜地施行管理政策,促进城市间协同绿色发展。 相似文献
7.
开展区域土地生态脆弱性时空变化研究,有助于因地制宜地利用土地资源和保护脆弱生态环境,对区域可持续发展具有重要指导意义。以黑龙江省宁安市为研究区,运用研究区1991年、2000年和2010年3期遥感影像数据,通过景观类型脆弱度指数计算模型,计算了三个时期各个景观类型的脆弱度指数,并运用土地生态脆弱度指数计算模型测算分析了3个时期土地生态脆弱性的变化情况,最后对土地生态脆弱度指数进行普通克里格法插值,得出研究区土地生态脆弱性空间分布情况。结果表明:1991年、2000年和2010年各景观类型的脆弱度由高到低依次为:耕地建设用地其他用地水域草地林地;研究区61.7%的样本区土地生态脆弱度指数增大,中高脆弱区所占全区面积比重不断增加,轻微脆弱区面积比重逐年减少,土地生态脆弱性不断加剧;由1991年、2000年和2010年土地生态脆弱性分布图可知,研究区土地生态脆弱性的分布总体呈现中北部重,外延逐渐减轻,中高脆弱区逐渐扩大的态势。 相似文献
8.
四川农村人口土地和经济系统的协调发展及时空演变 总被引：3，自引：2，他引：1
本文利用量化分析法和GIS空间分析法,以四川省为例,研究了在快速城镇化背景下,农村人口、土地和经济协调发展的时空变化特征及问题,以探讨农村社会经济可持续发展的出路。研究结果表明:2014年,四川农村人口-土地-经济系统以勉强协调过渡类和良好协调发展类为主,但区域间差异较大,表现为优质协调发展与严重失调衰退现象并存;从时间特征看,2000—2014年农村人口-土地-经济系统协调发展的时序变化较大,轻度失调衰退区和勉强协调过渡区有所减少,良好协调发展区逐渐增多,2000年勉强协调过渡区和良好协调发展区分别占市(州)总数的61.90%和14.29%,到2014年则分别占总数的33.34%和52.38%,而优质协调发展区和严重失调衰退区均无变化,总体呈现良好发展态势;从空间特征看,协调发展度较高的地区主要分布在平原、丘陵地区,山地、高原等自然地理条件较差区域的协调发展度则较低。总体而言,由于受地形地貌、资源禀赋和地理区位等方面的影响,四川各市(州)农村人口、土地、经济发展水平和三者间的协调发展度存在较大差异,应根据区域发展特色与不足,确定农业发展目标和重点,促进农村社会经济的可持续发展。 相似文献
9.
江苏省土地利用协调性空间差异研究 总被引：2，自引：0，他引：2
土地利用协调性评价对指导区域土地资源可持续利用具有重要意义.本文阐明了土地利用协调性概念,从土地与经济系统、土地与环境系统和土地与丰七会系统3个方面建立土地利用协调性系统评价指标体系,利用主成分分析法确立各指标权重,构建系统协调度、系统发展度和系统综合协调度模型,对江苏省69个评价单元的土地利用协调性及其省域空间差异进行评价.结果表明:江苏省总体土地利用协调性属于中度协调,但各区域间空间差异显著,呈南北向南递减的分异特征及规律;土地利用协调性与经济发展水平呈负相关,表现出郊区高于市区的分异特征及规律;"四沿"产业带地区土地利用协调性空间差异明显.最后结合研究结论提出了部分政策建议. 相似文献
10.
江苏省土地利用效益系统耦合相对发展演变研究 总被引：1，自引：1，他引：0
社会、经济、生态系统协调共生对区域可持续发展、土地资源合理配置有深刻影响。本文引入耦合度、耦合协调度、相对发展度模型测算江苏省13市2001～2015年土地利用各系统耦合协调及相对发展值,并在此基础上对其时空演变格局进行分析,确定各市土地利用发展类型,同时运用主成分分析法研究区域土地利用效益的驱动因素。结果表明:(1)江苏省土地利用三维系统耦合协调度由2001年的0.1253稳步提升到2015年的0.5193,实现"拮抗-磨合-中度耦合"的跨越且仍有很大的上升空间;(2)苏北、苏中、苏南梯度差异显著,呈现"两极发展"空间格局,总体趋向于协调发展(3)各系统间相对发展度差异显著,社会经济发展趋于同步但总体超前于生态发展,制约因素已由"社会经济"变为"生态制约主导";(4)城市综合建设水平,土地集约利用水平,环境保护治理水平是影响区域土地利用效益的关键因素。最后依据研究确定各市土地利用发展类型及滞后原因,契合江苏省"1+3"重点功能区战略,为城市土地利用发展实施差别化的发展战略提供理论基础与现实依据。 相似文献
11.
低氮和干旱胁迫对富士和秦冠生长及氮素利用的影响 总被引：2，自引：2，他引：0
【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.
I.L. Boyd 《Biological conservation》2010,143(7):1664-1674
“Wicked” problems are those that are complex and that change when solutions are applied. Many conflicts in conservation fall into this category. The study approached the problem of how to constrain the apparent wickedness of a problem in the conservation management of a species by using simple empirical indicators to carry out iterative assessment of the risk to a population and to document how this risk evolves in relation to the addition of new data and the implementation of management actions. Effects of high levels of uncertainty within data and also concerning population structure were examined through stochastic simulation and by exploration of scenarios. Historical trends in the example used, the Steller sea lion, showed rapid declines in abundance in some regions during the 1980s. The current total population is 130,000-150,000 Steller sea lions through Alaska and British Columbia and this number has been stable since about 1990 in spite of regional differences in population dynamics. Regional differences in the sequence of changes in the number of pups and non-pups, suggested that an internal re-distribution of juveniles could have happened between 1980 and 1990. Current productivity also appears close to the long-term mean. Stochastic population projection using various scenarios showed that, based upon this history, the risk of extinction for the population has declined and is below reasonable thresholds for considering the population to be endangered. The trends in risk suggest that management actions taken since 1990 have probably been effective. Consequently, the conservation management objectives for the Steller sea lion are probably being met. The approach provides a mechanism, based upon experience and scenario analysis, for exploring future policy options and may help to constrain the debate amongst stakeholders about the cost-benefit trade-offs associated with different options. 相似文献
14.
Soil-profile distribution of primary and secondary plant-available nutrients under conventional and no tillage 总被引：1，自引：0，他引：1
Nutrient distributions under no tillage (NT) compared with conventional disk-and-bed tillage (CT) management in the warm, humid region of the southeastern USA need to be assessed so that future placement, quantity, and type of fertilizers can be altered, if necessary, to efficiently match crop demands. We determined soil-profile distributions of pH, N, P, S, K, Ca, Mg, Na, Zn, Fe, Mn, and Cu to a depth of 0.9 m at the end of 8.5 years of continuous CT and NT management on a Weswood silty clay loam (fine, mixed, thermic Fluventic Ustochrept) in southcentral Texas. Most dramatic changes occurred within the 0–0.05 m depth, where soil under NT had lower pH, Fe, and Cu than under CT, but greater P, K, Zn, and Mn. Greater P and K under NT than under CT also occurred below the till-zone (0.15–0.3 m). At a depth of 0–0.3 m, soil under NT contained greater amounts of extractable P, K, Zn, Fe, Mn, and Cu than under CT. Nitrogen fertilization had little effect on nutrient distributions, except resulting in greater extractable K at 0–0.05 m and greater nitrate at 0–0.15 m. Few changes in soil-profile distributions were observed for extractable S, Ca, Mg, and Na. Long-term continuous use of NT on this fine-textured, high-fertility (except for N) soil had no apparent adverse effects on nutrient distributions relative to CT, but enhanced conservation and availability of P, K, Zn, Fe, Mn, and Cu near the soil surface where crop roots proliferate. 相似文献
15.
《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
16.
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
17.
Yoav Bashan Bernardo Salazar Ma. Esther Puente Macario Bacilio Robert Linderman 《Biology and Fertility of Soils》2009,45(6):585-594
To evaluate the feasibility of long-term desert reforestation technology of mixed vegetation, cardon cactus (Pachycereus pringlei) seedlings from indoor and outdoor nurseries were planted in the field adjacent to one seedling of potential legume nurse
trees: mesquite amargo (Prosopis articulata), yellow palo verde (Parkinsonia microphylla), and blue palo verde (Parkinsonia florida). Some of the planting holes were also supplemented with common dairy compost. Additionally, the combinations of legume tree–cactus
were inoculated with either a consortium of desert arbuscular mycorrhizal (AM) fungi, plant growth promoting bacteria (PGPB;
the diazotroph Azospirillum brasilense Cd, and the phosphate solubilizer Paenibacillus sp.), or a mixture of all. The field experiments were evaluated periodically during 30 months for survival and growth. Cardons
reared in an outdoor screen house survived better in the field than those reared in a controlled growth chamber and hardened
later outdoors. Association with any legume nurse tree increased survival and enhanced growth of untreated cardons. For cardons
growing alone, application of either compost, AM fungi, and all the treatments combined increased survival. For these plants,
no treatment affected plant growth during the first 3 months after transplanting. Later, all treatments, except for AM fungi,
enhanced plant growth. However, only 2 years after transplanting the enhanced growth effect of AM fungi was also significant.
In the presence of the legume nurse trees, transient positive effects on cardon growth were recorded. General evaluation after
30 months of cultivation showed that the treatments positively affected cardon growth when growing alone or in combination
only with mesquite amargo but not with the other two legume trees. This study proposes that young legume trees have the capacity
to enhance survival and growth of cardon cactus, depending on the legume cactus combination. Additional treatments such as
compost or PGPB can either amplify the effect or else attenuate it. 相似文献
18.
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
19.
Detailed karyotypes and 4C DNA amounts have been studied in five cultivars of Cajanus cajan and 20 species belonging to Cajanus, Rhynchosia, Dunbaria, Flemingia and Paracalyx. C. cajan shows intraspecific variability and its karyotype is most similar to that of C. cajanifolius (sect. Cajanus) in the morphology and number of satellite chromosomes and the lack of any correlation between chromosome size within the complement and asymmetry. Karyotypes of C. lineatus and C. sericeus belonging to sect. Atylia are similar with respect to maximum r-index and the ratio of longest and shortest chromosomes in their respective complements. C. acutifolius (sect. Frutocosa) is distinct in having a very low ratio (1.44) between the longest and the shortest chromosomes, while in C. albicans, C. goensis, C. scarabaeoides (sect. Cantharospermum) there is no chromosome pair with r-index >2.0. C. mollis and C. volubilis (sect. Volubilis) show similarity with regard to ratio between the longest and the shortest chromosomes and a distinct chromosome pair with an arm ratio of 2.7 and C. platycarpus is distinct (sect. Rhynchosoides) in having the smallest ratio (1.36) between the longest and the shortest chromosomes. 4C DNA amounts in Cajanus and Rhynchosia vary between 3.28 pg to 11.69 pg and 4.92 pg to 11.13 pg respectively, while in Dunbaria, Flemingia and Paracalyx these vary between 4.70 and 7:06 pg. In the genus Cajanus karyotypic features and 4C DNA amounts agree with the sectional classification and bring out a close relationship between C. cajan and C. cajanifolius. This is supported by studies based on seed protein patterns, isozyme analysis, trypsin and chymotrypsin inhibitor patterns, RFLP and RAPD data and crossability relationships. A clear relation between DNA amount and abnormalities effecting the extent of pairing and recombination in interspecific hybrids shows the importance of this study in developing future breeding programme involving C. cajan and its wild relatives that are of potential value. 相似文献
20.
Several commercial fungicide seed treatments were evaluated for their possible effect on the survival of Bradyrhizobium japonicum on seeds and on the nodulation and yield of soybeans in a greenhouse and a field experiment. quinolate Pro (carbendazim and oxine copper), Vitavax 200FF (carboxin and thiram), and Monceren (pencycuron) had a small effect or no effect on the survival of B. japonicum and on the nodulation and yield of soybeans. They can thus be considered compatible with soybean seed inoculation. Germipro UFB (carbendazim and iprodione), Apron 35J (metalaxyl), and Tachigaren (hymexazol) decreased B. japonicum survival and the nodulation and yield of soybeans and thus cannot be considered compatible with soybean seed inoculation. 相似文献