1990-2018年东江流域土地利用变化及其驱动力

[目的] 分析东江流域1990-2018年土地利用时空变化特征及驱动机制，为该流域土地利用优化提供科学参考。[方法] 利用流域土地利用数据及统计年鉴数据，结合土地利用评价指标、主成分分析法及灰色关联分析法分析流域土地利用变化特征及其驱动机制。[结果] ①东江流域1990-2018年土地利用以耕地和林地为主，流域建设用地面积持续增加，其余地类面积均呈减少趋势，耕地和林地是建设用地面积的主要来源；②流域土地利用综合指数逐年增加，变化率为0.038，土地利用处于上升发展阶段；③流域土地利用变化驱动力主要为经济增长、人口增长、社会富裕程度和农业发展；各类驱动因子对各土地利用类型的驱动作用不同。[结论] 1990-2018年，东江流域土地利用结构不断优化，土地利用集聚程度增加，随着粤港澳大湾区的建设开发，未来流域内土地开发利用活动将更加频繁。     

宁夏沿黄生态经济带耕地的时空演变及驱动力

[目的] 研究耕地空间分布格局与演变的驱动机制,为严守耕地保护红线及宁夏沿黄生态经济带制定耕地资源保护政策与措施,优化耕地保护格局提供参考。[方法] 利用土地变更调查数据和社会经济数据,采用核密度、空间自相关、土地利用动态度、转移矩阵、二元Logistic回归模型等方法,分析2010—2018年宁夏沿黄生态经济带耕地的空间分布、时空演变及其驱动机制。[结果] ①研究区耕地的空间分布呈现出明显的差异性,整体以中、低密度区分布为主,且由低、高密度区向中密度区演变;②耕地空间分布呈正相性,高—高聚类区域主要集中在银川平原,低—低聚类区域分布在灵武市东部、沙坡头区中西部等生态相对脆弱区;③研究区耕地的双向流转是以未利用地—耕地—建设用地为主的生态转换系统,耕地数量稳中有增;④耕地动态度变化有明显的空间聚类现象,且与距离城市的距离成正比,与城市规模成反比;⑤自然条件因子是耕地增加的主要驱动因素,社会经济因子是耕地减少主要驱动因素。[结论] 宁夏沿黄经济带耕地保护基本实现动态平衡。耕地变化是以一定的自然条件因子为基础,受经济、人口等社会经济因子综合作用下的效益择优过程。     

生态脆弱区土地利用变化及驱动力——以河北省张北县为例

[目的]研究河北省张北县的土地利用变化及其驱动因素,为该区域土地管理决策和土地资源可持续利用供科学依据。[方法]以1989,1995,2000,2010年TM遥感影像为数据源,运用遥感、地理信息系统、数理统计分析等技术与方法,系统分析了张北县土地利用变化的时空特征,剖析了土地利用变化的驱动因素。[结果]张北县主要地类为耕地、林地和草地,1989—2010年土地利用数量变化主要表现为耕地和草地面积的减少,林地和建设用地面积的增加,其中2000—2010年土地利用变化更为剧烈;地类转换主要表现为耕地、草地向林地转变以及耕地、草地向建设用地的转变;空间变化主要表现为东部坝头地区林地增加明显,中部平原地区建设用地扩张明显。[结论]近20年来张北县土地利用变化明显,主要受自然及社会经济因素综合影响。此外政策因素也是该区域土地利用变化的主要驱动因素。     

基于耦合FLUS-InVEST模型的广州市生态系统碳储量时空演变与预测

[目的] 探讨城市建设用地扩张下土地利用变化对碳储量的影响,揭示碳储量时空演变和未来空间分布趋势,为城市规划和生态脆弱区实施精准保护提供科学参考。[方法] 本文通过耦合FLUS-InVEST模型,基于解译的土地利用数据和未来土地预测,反演1990—2018年广州市土地和碳储量时空变化特征,分析建设用地扩张与碳储量分布规律,并评估未来碳储量潜力。[结果] 广州市土地类型变化特征表现为建设用地的迅速扩张,主要侵占耕地和林地;1990—2018年碳储量减少2.47×10⁶ t,其中2000—2005年降幅最大;高密度碳储量主要分布在北部森林一带,低密度碳储量主要分布在珠江下游;建设用地和低密度碳储量的重心迁移具有高度的一致性;预测2018—2034年碳储量下降1.20×10⁶ t。[结论] 广州市建设用地扩张对碳储量影响显著,未来西北和东部部分区域碳储量流失风险较大。     

滇桂黔石漠化片区生态系统碳储量时空演变及其驱动因子

[目的]探究特殊生态脆弱区——滇桂黔石漠化片区的生态系统碳储量时空演变规律及其驱动因子，为科学评估其生态治理效果、优化土地利用格局、提高生态系统碳储量、提升生态系统碳汇能力等提供理论参考。[方法]综合运用土地利用转移矩阵、InVEST模型和地理探测器等方法，分析滇桂黔石漠化片区1990—2018年土地利用变化特征、生态系统碳储量时空演变规律及空间分异驱动因子。[结果]滇桂黔石漠化片区城市建设蓬勃发展，石漠化治理效果良好。研究期内，建设用地和水域面积分别增加116.38%和76.40%,以石漠化裸岩石质地为主的未利用地则减少47.45%并主要转化为草地和林地；滇桂黔石漠化片区生态系统碳储量呈波动下降趋势，2018年降至30.61亿t,较1990年减少了0.52%。建设用地扩张对耕地和林地的侵占是碳储量减少的主要原因；滇桂黔石漠化片区生态系统碳储量空间分布差异明显，始终维持西南较高、南部次之、北部较低的空间分异特征，整体依次对应云南片区、广西片区以及贵州片区；滇桂黔石漠化片区生态系统碳储量空间分布差异受自然地理要素和社会经济要素共同作用，但人类活动影响最为显著。“距离县中心”始终是影响力最...     

近30年来滇中城市群生态用地变化轨迹时空演变特征及其驱动机制

[目的]生态用地在维持生态平衡和支撑经济发展方面发挥着重要作用。研究滇中城市群生态用地的时空演变特征和驱动机制对优化生态安全格局、推进云南生态文明建设、筑牢国家西南生态安全屏障具有重要现实意义。[方法]利用Google Earth Engine(GEE)云平台对滇中城市群1990—2020年生态用地进行识别的基础上,采用变化轨迹分析、热点分析和地理探测器对滇中城市群生态用地时空变化轨迹和驱动机制进行了探索。[结果](1)滇中城市群生态用地变化以非生态用地与林地互换为主,并集中发生在林地和非生态用地的过渡地带,而生态用地内部之间(林地和草地)的转换主要发生在研究区北部和南部的山地区域。(2)生态用地变化以低频次变化为主,高频次较少,频次变化在元江干热河谷、金沙江干热河谷区域、滇东滇东南喀斯特地带表现出明显的聚集效应。(3)耕地面积变化是影响滇中城市群生态用地变化的主要驱动力,社会经济因素对生态用地的影响力显著高于自然因素,在自然环境、耕地扩张、生态修复政策等多重驱动下,多因子交互作用对生态用地变化更具解释力。[结论]滇中城市群生态用地破碎,自然环境的改变和人类活动的日益增强极易导致生态用...     

抚仙湖流域生态用地时空演变及其驱动因素

[目的] 研究生态用地时空演变规律及形成机制，为维持区域生态平衡和保障生态文明建设提供科学参考。[方法] 运用土地利用变化幅度、洛伦兹曲线、基尼系数、回归分析及GIS技术等方法，分析2010-2018年抚仙湖流域生态用地时空演变特征及其形成机理。[结果] ①抚仙湖流域生态用地以耕地、林地和水域及水利设施用地为主。8 a来，耕地面积减少5.15 km²，林地面积减少1.94 km²，草地面积减少0.81 km²，园地面积减少0.19 km²，其他土地面积减少1.40 km²，水域及水利设施用地面积增加0.03 km²。②流域各种生态用地空间分布差异较大，耕地、林地空间分布较均匀，洛伦兹曲线比较靠近绝对均匀线，基尼系数居0~0.25之间。草地、园地、水域及水利设施用地和其他土地分布相对集中，洛伦兹曲线下凹程度较大，基尼系数多处于0.5之上。生态用地空间分布不均的趋势有所加强。③从驱动机制来看，导致流域生态用地时空变化的主要驱动因素为人口密度、城镇化水平、政策、到主要公路距离、到水域距离、到城镇建成区距离。[结论] 研究时段内，抚仙湖流域生态用地时空变化较显著，其变化是自然条件、社会经济条件及空间区位条件多种因素协同作用的结果。     

广东省1992-2015年土地覆被变化的时空差异及其成因

[目的] 从地形和社会经济两个因素出发探讨广东省土地覆被变化的时空差异及成因，为土地资源的可持续利用提供依据。[方法] 基于1992-2015年间广东省土地覆被数据，使用土地利用动态度、土地利用转移矩阵、灰色关联分析等方法量化土地覆被变化的时空特征与差异。[结果] 广东省土地覆被变化以2000年为节点可分为前期（1992-2000年）和后期（2000-2015年）两个阶段。前期耕地面积显著增加，建筑用地面积增速缓慢；后期耕地面积减小，建筑用地面积扩张迅速。地形因素造成土地覆被变化存在空间差异性。在高程低，坡度缓的区域土地覆被变化主要是耕地转化为建筑用地，而在坡度中等区域主要是林地转为耕地。社会经济因素造成土地覆被变化呈现较明显时间差异性，多种因子驱动广东省土地覆被发生变化。但对于不同的土地覆被类型，驱动因子前后期的关联度大小不同，土地覆被发生变化是多种因子驱动叠加的结果。[结论] 地形因素会造成土地覆被变化的空间差异，而社会经济因素导致土地覆被变化的时间差异。     

1990-2015年阿克苏市建设用地的扩展与驱动力

[目的]探讨新疆阿克苏市建设用地扩展特征及其驱动因素和存在的问题,为绿洲城市发展和建设决策提供一定的利用依据。[方法]以1990,2000,2010,2015年的Landsat TM/ETM⁺卫星遥感影像为数据源,借用ENVI进行监督分类,得出阿克苏市4个时间段的建设用地、耕地、林地、水体、未利用地等信息。应用建设用地扩展强度、速度,重心坐标转移、紧凑度、弹性系数等指标,研究阿克苏市建设用地变化规律。[结果]1990年建设用地面积为18.34 km²,2015年建设用地面积为91.61 km²,25 a里总扩展面积为73.24 km²,净增加了1990年的4倍。建设用地扩展中主要占用的土地类型为未利用地和耕地,面积分别为43.84,28.04 km²。建设用地重心坐标向EN,WS,WS方向迁移,靠近交通路线移动。1990-2000年重心坐标移动距离不大,移动距离为243.7 m。2000-2010年移动距离为832.2 m。2000-2015年移动距离最大（为1 568.2 m）,扩展形状为面状和条带状。建设用地外围紧凑度一直呈下降趋势,从1990年的0.201下降到2015年的0.066,城市空间形态越来越复杂。[结论]阿克苏市1990-2015年建设用地不断往外扩展。阿克苏市建设用地扩展速度在研究期间一直高于人口增长速度,而两者之间差距不断扩大,弹性系数为1990-2000年2.3,2010-2015年10.13,城市扩展与人口增长高度不合理。非农业人口因子、经济因子、政策因子、交通因子是引起阿克苏市土地利用变化最主要的驱动因素。     

2005-2018年澜沧江下游流域景观生态安全时空变化及其驱动因素

[目的] 分析澜沧江下游流域景观生态安全时空变化规律和驱动机制，为该流域及流经国家的人与自然协调可持续发展提供科学依据。[方法] 以2005，2010，2015和2018年4期遥感影像为数据源，通过景观指数和GIS空间分析方法评价流域景观生态安全，采用双变量空间自相关方法明确城市、道路、河流、高程、坡度、气温和降水等因素对景观生态安全的驱动作用。[结果] ①2005—2018年，澜沧江下游流域的整体景观生态安全度呈先升后降的变化特征。其中，北部和中西部景观生态安全较差，东部、南部和东南部较好，但也有恶化趋势；②各景观类型中，景观生态安全度从大到小为：水域 > 林地 > 草地 > 耕地 > 建设用地 > 裸地。其中，林地和草地的景观生态安全度存在波动，耕地和水域的景观生态安全度一直上升，而建设用地和裸地的景观生态安全度持续下降；③距城市距离、距道路距离、气温和降水等社会和气象因素对景观生态安全时空变化的驱动作用最强，距河流距离也对景观生态安全的时空变化有一定解释作用，而高程和坡度等地形因素并非澜沧江下游流域景观生态安全时空变化的主要驱动因素。[结论] 应尽量降低由人类活动引起的生态环境负荷，积极发挥气象因素对生态安全的正向效应，促进澜沧江下游流域的人与自然协调可持续发展。     

“绿色革命”以来大气CO2浓度升高对C3作物营养品质的影响

自20世纪60年代"绿色革命"以来,育种技术和农耕技术的发展促进了农作物产量的大幅提升,然而作物的营养品质出现下降趋势。在相似的遗传背景下,大气CO_2浓度升高会使单位体积农作物产品的营养元素含量下降,因此"绿色革命"至今,农作物产品的营养元素下降可能受大气CO_2浓度升高影响。通过植物生长箱模拟"绿色革命"初期和目前的大气CO_2浓度水平(310μmol/mol和400μmol/mol),针对主要C_3作物水稻、小麦和大豆,研究"绿色革命"以来大气CO_2浓度升高对其籽粒的C、N、Fe、Zn元素含量的影响,结果表明:CO_2浓度升高对3种作物籽粒的C元素含量几乎没有影响,变化幅度在±1.5%之间;籽粒的N、Fe、Zn元素含量普遍呈现下降趋势,但均未达到显著水平。     

Potential of wild species for genetic enhancement of some semi-arid food crops

Discovery and incorporation of genes from wild species provide means to sustain crop improvement, particularly when levels of resistance in the cultigens are low and virulent strains of pests and pathogens overcome the host plant resistance. The extent of utilization and the potential of the wild genepool for genetic enhancement were reviewed in five important food crops viz. sorghum, pearl millet, chickpea, pigeonpea and groundnut grown in the semi-arid tropics. Introgression from compatible wild germplasm in the primary gene pool resulted in transfer of new cytoplasmic male sterility systems in pearl millet and pigeonpea, development of high protein, cleistogamous flower and dwarf pigeonpea lines and foliar disease resistant groundnut cultivars. Utilization of wild species in secondary and tertiary gene pools has been generally limited due to sterility, restricted recombination or cross incompatibility. Nevertheless, these species are extremely important as they contain high levels of resistance to several important biotic and abiotic stresses. Several of them, like those belonging to the Parasorghum section and the rhizomatous Arachis species are sources of multiple resistances and hold great promise to sustain crop productivity.     

Faculty positions:Center for Agricultural Resources Research,Chinese Academy of Sciences

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     

Soil-profile distribution of primary and secondary plant-available nutrients under conventional and no tillage

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.     

Assessing the effectiveness of conservation measures: Resolving the “wicked” problem of the Steller sea lion

“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.     

Collection and preliminary evaluation of native turfgrass accessions in Italy

Despite a raising interest on turfs in Italy, all theavailable varieties of this kind in the Country are of foreign origin, and areoften poorly adapted to the prevailing climatic conditions. This prompted tobegin a collection activity of indigenous turfgrass species, with the ultimategoal of identifying promising materials for future breeding based on localgenetic resources. The collection was carried out in three areas of Italy, viz.the northern Po Plain, the coastal region of Liguria, and the island of Sardiniathat are characterised, respectively, by subcontinental, warm temperate, andtypical Mediterranean climate. Altogether, 141 sites were visited, yielding 226accessions belonging to eight species of potential interest for turfs:Poa pratensis, Poa trivialis,Festuca rubra, Festuca arundinacea,Lolium perenne, Agrostis stolonifera,Agrostis tenuis, and Cynodon dactylon,this last being a warm-season grass. Poa pratensis andCynodon dactylon were mostly collected in northern Italyand Sardinia, respectively, whereas Festuca arundinacea andLolium perenne were rather ubiquitous. The collection sitesranged from 0 to 1040 m asl, but sites over 750 m wereonly visited in the inner part of Sardinia. All the accessions, collected aswhole plants, were transplanted at Lodi, northern Italy, where they are beingevaluated. Their preliminary evaluation for traits of importance for turf use,such as sward colour and overall quality, highlighted the great variation andthe occurrence of interesting accessions in all species. Other characters wererecorded, bearing specific importance in individual species, and in all casespromising accessions were identified. The germplasm of Festucarubra, Festuca arundinacea, and Loliumperenne proved highly infected by endophytic (symbiotic) fungi of thegenus Neotyphodium.     

Enhanced establishment and growth of giant cardon cactus in an eroded field in the Sonoran Desert using native legume trees as nurse plants aided by plant growth-promoting microorganisms and compost

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.     

Karyotypic and genome size variation in Cajanus cajan (L.) Millsp. (pigeonpea) and some wild relatives

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.     

Effect of some fungicide seed treatments on the survival of Bradyrhizobium japonicum and on the nodulation and yield of soybean [Glycine max. (L) Merr.]

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.     

Leaf position and genotype differences for mineral element concentrations in sorghum grown on tropical acid soil 1

Mineral element deficiencies and toxicities are common problems associated with sorghum [Sorghum bicolor (L.) Moench] production on acid soils. To better understand some of the mineral element problems and the analysis of plant tissue of sorghum plants grown on acid soils, four sorghum genotypes were grown on an acid Oxisol at Carimagua, Colombia limed with dolomite at 2 and 6 Mg ha^‐1.

Samples for mineral element analyses were obtained from leaves at different positions on the four genotypes. Concentrations of P and Mg were highest in the flag leaf (Leaf No. 1) and decreased as the position on the plant declined from the top of the plant for plants grown at 2 Mg lime ha^‐1. Similar decreases in P, Mg, K, and Zn concentrations occurred in plants grown with 6 Mg lime ha^‐1. Concentrations of Ca, S, Si, Mn, Fe, Cu, and Al increased as leaf position declined from the flag leaf for plants grown at 2 and 6 Mg lime ha^‐1. The higher lime supply enhanced Ca and reduced Mn and Fe concentrations in leaves. Differences in mineral element concentrations for the four genotypes used were fairly extensive. The elements to show the greatest range among genotypes were Al and Si and the elements to show the least range among genotypes were P, K, and S. Care should be used in collecting leaf samples for plant analysis and genotypic differences for accumulation of mineral elements should be considered in interpretation of results.