Wheat cultivation in association with Acacia nilotica (L.) Willd ex. Del. field bund plantation — a case study     

K. K. Sharma 《Agroforestry Systems》1992,17(1):43-51

The paper presents the results of a case study conducted to find out the influence of single row bund plantation of Acacia nilotica var. juquemontii on the growth and yield of associated wheat crop under irrigated conditions in Haryana, India. The indications are that the tree line does affect all crop parameters like height growth, shoot numbers, ear length, grain number and grain yield in the vicinity of trees upto 4 m distance from the tree line and establishes that as the distance from the tree line increases the growth and yield of wheat crop also improves. The effect on wheat crop was found more pronounced in the plots laid out towards the middle of the tree line as compared to plots towards the outer border.  相似文献   

四种中美洲热带松种源苗期试验^*          下载免费PDF全文

王豁然  王琦 《林业科学研究》1995,8(6):665-670

４种中美洲热带松台库努曼松、马克西姆松、墨西哥松和卵果松于１９９２年在广西、广东和福建的引种试验表明，它们的早期表现是成功的。１８个月生时的总平均树高依次为１．６２、１．３７、１．３３和１．５１ｍ，分别为对照湿地松树高１．２６ｍ的１２８％、１０８％、１０５％和１２Ｏ％；在福建岩溪林场，这４种热带松树高分别为当地马尾松平均高０．７５ｍ的２０９％、１６２％、１８１％和２１２％。２１个种源分别树种的方差分析表明，各自的种源间在高生长上都存在着显著差异。种源内个体间的变异范围较大，不同种源的个体变异幅度为８．８％～３９．９％。  相似文献   

干旱地区酸枣育苗技术   总被引：2，自引：0，他引：2  

马廷贵  何鹏力 《内蒙古林业科技》2007,33(4):38-39,42

通过干旱区酸枣育苗试验,对酸枣育苗苗圃地选择、整理、酸枣种子处理、育苗地和苗木管理等系列技术进行了研究和总结,旨在为干旱带枣产业发展及苗木培育提供技术参考。  相似文献   

安徽省毛竹实生苗造林苗木标准的探讨   总被引：2，自引：0，他引：2  

赵昌恒  方乐金 《竹子研究汇刊》2006,25(2):1-2,6

以不同规格毛竹实生苗造林3年生试验结果为依据,综合考虑毛竹实生竹苗的生物学特性、生境地区性、苗木优质性、生产可行性、经济许可性、综合代表性等因素,制订了安徽省毛竹实生苗标准。生产实践表明,该标准对促进和提高毛竹育苗技术水平具有较大的激励作用,促进了毛竹实生苗造林质量的不断提高。  相似文献   

短柄ISSR-PCR反应体系的优化   总被引：1，自引：0，他引：1  

丁丽亚  金则新  李钧敏 《福建林业科技》2006,33(1):45-47

以短柄(Quercus glanduliferavar.brevipetiolata)的DNA为材料,对影响PCR扩增效果的一些因素诸如模板DNA用量、Taq酶的用量、镁离子浓度、dNTP的浓度、引物用量和牛血清白蛋白浓度等指标进行筛选和优化。结果显示适合短柄ISSR-PCR分析最适宜的PCR反应条件为:10μL PCR反应体积中,1×Taq酶配套缓冲液(10 mmol.L-1Tris-HCl,pH9.0,50 mmol.L-1KCl,0.1%Triton X-100),0.75UTaq DNA聚合酶,2 mmol.L-1MgCl2,0.2 mmol.L-14×dNTP,12 pmol引物,10 ng模板DNA,2 mg.mL-1牛血清白蛋白。短柄ISSR扩增较适宜的退火温度为54.4℃。  相似文献   

激素及支持物对丰花月季快速繁殖的影响     

马纯艳  尤英豪  袁柄存 《吉林林业科技》2005,34(2):4-6

丰花月季的茎段(含腋芽)在MS 6-BA3．000 NAA0．400或MS 6-BA3.000 NAA0.005的培养基上，腋芽能顺利萌发，采用MS 6-BA3.000 NAA0．005可以从无菌苗诱导大量丛生芽，在继代培养中，不同含量的6-BA和NAA在诱导效率上有明显的不同。以沙子替代琼脂作为支持物，诱导初代腋芽的效率比琼脂高，幼苗的生根率和移栽成活率均很高。  相似文献   

8种育苗基质的思茅松嫩枝扦插育苗试验   总被引：11，自引：0，他引：11  

邓桂香  雷玮  李江  姜远标  万如雯 《西部林业科学》2005,34(4):58-61

为研究育苗基质与思茅松嫩枝扦插育苗效果间的关系,进行了8种不同基质的思茅松扦插育苗试验。结果表明,以河沙与锯末(1?2)为基质的扦插育苗成活率最高,平均成活率为82%;河沙与丹麦基质(1?2)的扦插苗平均不定根数量最多,达到5.2条/株;锯末基质扦插苗的平均不定根长最长,达5.50 cm/株;锯末与丹麦基质(1?1)的平均不定根最长值和单株不定根最长值最长分别为15 cm和21.7 cm。试验结果还表明,酸性基质有利于思茅松嫩枝扦插苗的成活,基质的总孔隙度大小影响着扦插苗根系的生长。  相似文献   

思茅松1-脱氧-D-木酮糖-5-磷酸合酶(DXS)基因的克隆及功能分析          下载免费PDF全文

王毅  周旭  毕玮  杨宇明  李江  王娟 《林业科学研究》2015,28(6):833-838

1-脱氧-D-木酮糖-5-磷酸合酶(DXS)是甲基-D-赤藓醇-4-磷酸(MEP)途径中的第一个酶,也是限速酶。本文根据思茅松(Pinus kesiya var. langbianensis(A. Chev.) Gaussen)树皮转录组数据分析结果,获得思茅松DXS基因片段,然后根据获得的基因片段设计特异引物,运用RT-PCR和RACE技术从思茅松树皮中克隆得到完整的DXS基因(PkDXS1)。PkDXS1基因的cDNA全长序列2888 bp,含有1个2223 bp的开放阅读框(ORF),编码740个氨基酸,该基因推断的蛋白与赤松(Pinus densiflora Siebold & Zucc)DXS蛋白的相似性为99%,与欧洲云杉(Picea abies(L.) H. Karst.)DXS的相似性为97%;经氨基酸序列比对,推断思茅松DXS具有高等植物DXS酶特有的叶绿体转运肽,二磷酸硫胺结合位点和转酮醇酶结构域。半定量RT-PCR检测表明树皮的创伤促进DXS基因的表达。  相似文献   

Response of slash pine planted on mounds in central and southwestern Louisiana     

James D. Haywood 《New Forests》1987,1(4):291-300

On two silt loam flatwoods in Louisiana, use of mounds as planting sites for slash pine (Pinus elliottii Engelm. var. elliottii) was shown to be more effective than planting without mounds (untreated control) after six growing seasons in the field. Mounds formed were of two sizes: low mounds made of 550 dm³ of soil and high mounds made of 1,000 dm³ of soil. One site was in central Louisiana and had two drainage classes: a somewhat poorly drained Caddo-Messer complex and a poorly drained Caddo soil. On both drainage classes, pine survival was not affected by treatment, but the incidence of fusiform rust galls on the main stem (caused by Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme Burdsall and Snow) was greater on trees planted on mounds. The second site was a poorly drained Caddo soil in southwestern Louisiana. At this site, there were fewer surviving pines on controls than on mounds, but the incidence of rust galls was not affected by treatment. At both sites, pines were taller and had a greater mean diameter at breast height on mounds than on controls. Mound size did not influence tree size at either site.  相似文献   

First-year freeze hardiness of pure species and hybrid taxa of Pinus elliottii (Engelman) and Pinus caribaea (Morelet)     

P. D. Duncan  T. L. White  G. R. Hodge 《New Forests》1996,12(3):223-241

Six pine taxa were compared for freeze hardiness following 2 whole plant freeze tests carried out in early and late winter 1993–94. Pure species included slash pine (Pinus elliottii var. elliottii Engelman) (PEE), Caribbean pine (Pinus caribaea Morelet) var. bahamensis (PCB), and var. hondurensis (PCH). The same six slash pine parents served as the female parents of the pure slash pine taxon and were control pollinated to create the F₁ hybrids of slash pine × Caribbean pine var. bahamensis (F1B), the F₁ of slash pine × Caribbean pine var. hondurensis (F1H), and the backcross of slash pine × (slash pine × var. hondurensis (B1H). Four traits related to adaptation (bud set, foliage/stem damage, survival) were compared. Significant differences existing among the three species at all temperatures for both freeze tests. The 3 hybrid taxa were intermediate to parental taxa for all measured traits and only at extreme temperatures was there an indication of hybrid vigor. However, inspection of foliage damage curves to estimate temperatures at which 50 percent damage occurs indicated that the hybrids deviated from the mid parent value toward the more freeze susceptible parent. Discriminant functions which included foliage damage and survival traits provided the best segregation of taxa groupings and the combining of canonical variable 1 for these discriminant functions placed hybrids intermediate to parental taxa. Parent × taxa interaction was significant, suggesting that within these taxa, family to family variation occurred, but different maternal parents were associated with the freeze hardly families in different taxa.This is Florida Agricultural Experiment Station Journal Series No. R-04852 of the Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL, 32611  相似文献