Propagation techniques on root turion sprout browse ofPopulus davidiana Dode     

Xing Ya-juan  Wang Qing-gui  Wang Yan-he 《林业研究》2001,12(2):143-145

The root segments selected from dominant trees ofPopulus davidiana Dode were taken as reproductive material and were buried in different depths to carry out the reproduction of root turion sprout. The affecting factors of gemination rate, survival rate, and height growth for cutting wood of root sprout were comparatively analyzed. The results showed that the best suitable substrate for burying root is pearlite, with a germination rate of 15.16%. 3–4-cm root segments has the highest rate of germination (12.4%). The mixture of sand and soil (2∶1) is the best cutting substrate, with a survival rate of 81.3%, while as to height growth of cutting wood, the mixture of turfy and soil (1∶1) is the best. The cutting woods selected from different positions of stem show difference in height growth. The cutting wood from top stem is higher obviously than those from middle or low stem. Biography: XING Ya-juan (1969-), female, assistant researcher in Forest Research Institute of Heilongjiang Province, Harbin 150040, P. R. China. Responsible editor: Song Funan  相似文献   

东方杉温室大棚扦插育苗技术     

尹中明  吴文 《江苏林业科技》2009,36(5):44-45

东方杉系杉科属间杂交新树种,半常绿高大乔木,具有耐水湿、耐盐碱、生长速度快、景观效果好、抗风等优良特性;东方杉不结实,且无性繁殖困难。该文介绍了东方杉温室大棚扦插设施准备,采穗圃营建,扦插育苗方法等育苗技术。应用于大规模苗木生产,平均成活率达到76.3%。  相似文献   

紫花苜蓿受冻害后促进根颈枝条再生方法的研究     

张宝田  穆春生  李志坚  周道玮 《中国草地学报》2003,25(5):48-51

对蔚县苜蓿根颈冻害后切除冻伤部分处理的比较研究结果表明,处理区的根颈苗数、地上高度、地上生物量、分蘖丛数是对照区的1.6～2倍;处理区苜蓿的各个数量指标的b值大于对照处理苜蓿b值,说明除冻害根颈后苜蓿的生长比不除冻害根颈部分的苜蓿生长更为合理。通过除去苜蓿冻害部位,防止根系继续腐烂,保护了未冻害部分,增加了苜蓿发芽的有效部位。同时,使根系与地面的距离变短或露出地面,增加光照强度,提高地温,促使未冻害苜蓿根系发芽,返青提前增加产量。  相似文献   

百合组培中鳞片处理及其颜色变化与鳞茎形成的关系   总被引：10，自引：0，他引：10  

王爱勤  何龙飞  温庆兰  林鉴钊 《园艺学报》2004,31(1):117-119

 研究了百合鳞片发育程度、切割段数、形态及生理变化、培养基的P 和K含量与鳞茎形成的关系。结果表明: 取中层鳞片、每片横切6 段的繁殖系数最高, 基部鳞片结鳞茎数最多, 且鳞茎发生最早。鳞片由基部向顶部繁殖系数递减。培养过程中鳞片颜色和形态变化依次为乳白色、浅黄、浅紫色、绿紫、鳞片干枯、鳞茎增大, 鳞片由浅黄变为绿紫色过程中叶绿素含量增加, 淀粉和可溶性糖含量下降。适当增加培养基中P、K的含量可提高鳞茎形成的数量和质量。  相似文献   

秃杉大径级用材林抚育采伐技术的研究   总被引：1，自引：0，他引：1  

刘佩云 《林业科技》2011,36(2):38-40

结合国家林业行业标准《秃杉速生丰产林》编制的要点,对秃杉大径级用材林抚育采伐进行了专项调查和研究;结合具体实际培育过程,有的放矢地提出了培育目标、分区生长指标以及抚育采伐的原则、对象和范围,为秃杉大径级用材林的培育提供了技术保障。  相似文献   

切根与不同形态氮素对板栗苗木根系构型及生长的影响     

王雪莹  郭素娟 《东北林业大学学报》2020,(4):15-19

为探明不同调控技术对板栗根系构型的影响和对板栗生长发育的作用效果,以期为培育高质量板栗苗木提供科学依据,采用大田板栗苗木为对象进行切根(切根深度分别为12、8、4 cm、CK)及不同形态氮素(尿素、硝酸钠、CK)追肥试验。结果表明:苗高生长量最大的处理为X2N2,地径生长量最大的处理为X4N1,不同处理苗木地径生长量差异性不显著;在同样切根深度的处理下,施用尿素的苗木在根系总根长、总表面积、总体积上均大于施用硝酸钠的苗木,也即NH^+4较NO^-3对板栗苗木根系生长发育具有更好的促进效果;X1N1、X2N1、X2N3处理在不同径级侧根的根长、根表面积、根体积上分别达到最高,差异性显著(P<0.05)。综合考虑苗木根系指标和形态指标,X2N1即切根深度8 cm结合施用尿素为板栗苗木根系的最佳调控处理。  相似文献   

Forage legumes in grass pastures in tropical Brazil and likely impacts on greenhouse gas emissions: A review     

Robert M. Boddey  Daniel Rume Casagrande  Bruno G. C. Homem  Bruno J. R. Alves 《Grass and Forage Science》2020,75(4):357-371

Beef cattle producers seldom use fertilizers for their pastures in tropical regions of Brazil. Slowly, this is changing but because of the need for repeated applications, N fertilizer is rarely applied. The introduction of a forage legume is an appropriate solution for this problem, but until recently adoption has been very low as the legumes generally have not persisted in the sward. We report research on how grazing management can affect the persistence of stoloniferous legumes in pastures of Brachiaria spp. and the problems of establishing and maintaining crown-forming legumes such as Stylosanthes spp. With suitable management, milk or bovine carcass yields can be equal or greater from mixed than from grass-alone pastures fertilized with 120 or 150 kg Nha^-1 year⁻¹. In addition to savings in CO₂ emissions from fossil fuels for the production and distribution of N fertilizers, nitrous oxide emissions from cattle excreta and legume residues are lower than those from N-fertilized brachiaria grass monocultures. Other studies indicate that enteric methane emissions from cattle may be mitigated when forage legumes are included in their diet. The use of forage legumes in mixed pastures for tropical regions is emerging as a feasible strategy to keep meat and milk production at acceptable levels with reduced greenhouse gas emission rates.  相似文献   

施肥对割草地羊草功能性状和化学计量学的影响     

白玉婷  代景忠  夏江宝  闫瑞瑞  杨红军  吕世杰  卫智军 《草地学报》2021,29(11):2442-2453

本研究以羊草（Leymus chinensis）为研究对象,测定羊草植物功能性状、营养元素和化学计量等多个指标,进行多角度综合系统的研究,阐释羊草割草地羊草种群对不同改良措施的响应特点及变化规律。运用单、双因素方差分析、相关分析和主成分分析方法对相关指标进行统计分析。结果表明：大多数羊草功能性状对施肥处理较为敏感,但随着施肥年份增加,部分指标敏感程度减弱;高浓度（N 10.5 g·m^-2+P 5.1 g·m^-2）施肥处理显著增加了株高和茎长,茎长成为羊草株高增长的主要因素;高浓度（N 10.5 g·m^-2+P 5.1 g·m^-2）施肥处理有利于羊草种群地上生物量的增加;羊草氮含量随着施肥年份增加逐渐增加,羊草氮含量与羊草C：N存在高度负相关,施肥（N 10.5 g·m^-2+P 5.1 g·m^-2）处理下羊草叶片和茎的C：N,羊草个体和叶片C：P最低。  相似文献   

不同处理对四季秋海棠扦插生根的影响研究   总被引：10，自引：1，他引：10  

柯存祥 《中国农学通报》2006,22(4):331-331

以四季秋海棠为材料，进行扦插生根研究。试验结果表明：不同季节、不同基质、不同植物生长调节剂对四季秋海棠扦插生根有很大的影响，其中秋季扦插，以河沙做基质，以30mg/LNAA、30mg/LIAA或50mg/LIBA处理的插条生根效果较好。  相似文献   

低温工艺条件下刀具的相变与耐磨性研究   总被引：6，自引：0，他引：6  

黄敏纯 《农业机械学报》2003,34(5):147-149,146

研究了低温工艺条件下高速钢刀具显微组织中回火马氏体和残留奥氏体相变过程，即从回火马氏体中析出大量弥散的碳化物，并伴随组织的超微细化和残留奥氏体的转变，提高了刀具的耐磨性，降低了被加工零件的表面粗糙度，延长了刀具的使用寿命。  相似文献