共查询到16条相似文献，搜索用时 375 毫秒
1.
沙地云杉林植物区系特征的研究 总被引：1，自引：0，他引：1
根据野外调查,分析了沙地云杉林的植物区系成分,进行了种子植物的统计并得出结论:在沙地云杉林中,共有161种植物,分别属于49科,123属。其中1种蕨类植物,2种裸子植物,158种种子植物。共有10种地理成分分布类型,其中以达乌里-蒙古成分占优势,内蒙古自治区的特有成分只有沙地云杉一种。根据优势成分分析,发现在乔木层中只有沙地云杉和白桦达到存在度的4~5级,灌木层中只有黑果木旬子木达到5级。根据相似系数比较发现:沙地云杉林有56.8%的科、47.4%的属、47.4%的种与大针茅草原相同;有60.8%的科、22.3%的属、7.2%的种与长白山的典型暗针叶林相同,因此沙地云杉林仍然属于暗针叶林范畴。 相似文献
2.
在我国内蒙古自治区森林草原过渡带中,从林窗内到周围环境进行沙地云杉(Piceamongolica)幼苗的调查以阐明其梯度变化。在沙地森林区,选择了一个形成年龄长达30年的大林窗,从林窗中央向周围森林作2个5m宽的样带,对沙地云杉幼苗动态进行了监测。幼苗距离林窗中心越远,个体越高,数量也越多。在林窗内,有很多幼苗,但是大多数的幼苗在它们长大之前就死亡了。相对于林木高度的动态变化,幼苗的死亡率在样带中的分布基本上有着相似的规律。沿着森林的边缘,幼苗的生长可能由于林窗中边缘光线渗透而得到暂时的提高。文中还讨论了自然森林的更新动态。结果表明在沙地云杉林里林窗干扰带能产生一个非均质的环境促进物种的更新,从而决定了该森林是一个多年龄层次的森林类型。图6参37。 相似文献
3.
4.
多伦县沙地云杉混交林物种多样性研究 总被引：1，自引：0，他引：1
以多伦县沙地云杉林3条样带的群落调查数据为基础,研究了沙地云杉混交林的物种组成结构,分析了3个典型群落乔木层、灌木层、草本层的物种多样性。结果表明:沙地云杉混交林植物种类丰富,乔木层、灌木层、草本层共有植物71种,群落垂直结构分层明显;多伦县沙地云杉与白桦混交林物种多样性较丰富,在群落梯度上,群落Ⅰ为52种,群落Ⅱ为45种,群落Ⅲ为47种,物种丰富度指数大小顺序为群落Ⅰ>群落Ⅲ>群落Ⅱ;群落的物种多样性指数变化规律大致相同,均为草本层>灌木层>乔木层;3个典型群落的物种均匀度指数变化规律基本一致,为乔木层最大,灌木层其次,草本层最小。通过对多伦县沙地云杉混交林物种多样性的研究,为加强沙地云杉生物多样性的保护和经营管理提供理论依据。 相似文献
5.
不同方法提取三种生态型沙地云杉总DNA的比较 总被引：1，自引：0，他引：1
沙地云杉为内蒙古特有树种,干旱适应性强,是我国西部重要造林树种。在长期适应干旱生态条件的过程中沙地云杉形成了紫果型、绿果型和红果型3种生态型。前期研究证明:紫果型沙地云杉有更强的抗旱能力,绿果型抗旱能力弱,红果型处于二者之间,是一个比较典型的过渡类型。本文从分子生物学的角度,详细叙述了沙地云杉总DNA的提取过程、方法,并对已知的植物DNA提取方法作了针对性的改良;对实验过程提取DNA的影响作了分析。为今后针对进行沙地云杉的植物基因研究和生物工程打下基础,对扩大沙地云杉造林面积和西部大开发的生态环境建设具有重要的指导意义。 相似文献
6.
7.
内蒙古白音敖包自然保护区境内的天然云杉林,是红皮云杉林还是白扦林?国内学者长期以来就有争论。这种争论已经在近年来公开出版的一些重要著作中明显地反映出来。例如《中国主要树种造林技术》(260页)和《内蒙古植被》(784页)的作者,认为白音敖包的云杉是红皮云杉;而《中国植被》(511页)和《中国的自然保护区》(146页)及《内蒙古植物志》(第一卷)的作者却认为是白扦。为了弄清这个问题,本刊将在科普园专栏中陆续地刊登一些有关文章,欢迎广大科技工作者踊跃来稿、参加讨论。 相似文献
8.
9.
10.
沙地云杉引种实验 总被引：1，自引：0，他引：1
刘瑞芬 《内蒙古林业调查设计》2008,31(6)
沙地云杉是我国珍稀濒危树种,为了扩大这一树种的造林范围,2003年将其树种从内蒙古克什克腾旗的白音敖包引种到呼和浩特,对其适应性进行了观察。结果表明:沙地云杉在呼和浩特市生长正常,两年高生长达6.73 cm,物候期比原产地提前30d,保存率为35.5%,因此沙地云杉有引种成功的可能性。 相似文献
11.
Picea mongolica is an endemic and endangered species in China. Ecosystem made ofPicea mongolica is a special sandy forest ecosystem in China. It is found at ecotone between forest and steppe, or agricultural district
and pas toral area. Based on investigation, this paper discussed the formation and distribution ofPicea mongolica and studied its nature according to ecotone theory. It is clarified thatPicea mongolica belongs toPicea meyeri series. That is to say, it became a local race through long-term adaptation to the local climate, then formed allopatric
semi-species, and finally turned into a taxonomical species.Picea mongolica forest is a super zonal climax community developing in ecotone between forest zone and steppe zone.
Foundation item: The study was supported by National Natural Science Foundation of China (39670133, 39900019, 30070129).
Biography: ZOU Chun-jing (1968-), male, Ph.D, associate researcher fellow in Institute of Applied Ecology, Chinese Academy of Science,
Shenyang 110015, P. R. China
Responsible editor: Chai Ruihai 相似文献
12.
《林业研究》2021,(1)
Picea mongolica is a conifer with a limited distribution in China and its taxonomic status is controversial.In order to explore genetic differences between P.mongolica and other nearby Picea species and to investigate its taxonomic status,phylogenetic relationships were analyzed between P.mongolica and Picea koraiensis,Picea meyeri and Picea wilsonii by three chloroplast gene sequences matK,chIB and atpA.The length of joint chloroplast sequence is 2379 bp.The fifteen haplotypes were identified by haplotype network analysis,among which two were major haplotypes and nine were unique.In addition,the genetic diversity of the sample collection species was inferred.Based on the haplotype network and Neighbor Joining phylogenetic tree analysis,P.mongolica was located on the basal clade of the phylogenetic tree which had more primitive taxa,and the genetic diversity of P.mongolica was highest.The significant differences between P.mongolica and these other Picea species were identified by this research. 相似文献
13.
基于28个20mx90m样地的调查数据,利用Lotka-Volterra模型,本文分析了长白山北坡阔叶红松(Pinuskoraiensis)林和云冷杉林(也叫暗针叶林)群落交错区优势树种之间的竞争及动态。结果显示:在自然条件下,群落将向两个方向分化,一是以云杉(PiceajezoensisandP.koraiensis)和冷杉(Abiesnephrolepis)为优势的群落,并在达到平衡时冷杉占绝对优势(相对优势度的77.1%):另一种是以红松或云冷杉和阔叶树占绝对优势的针阔混交林,并在达到平衡时,阔叶树在阔叶红松林中占相对优势度的50%,在云冷杉一阔叶林类型中占66%。同时,本研究说明:(1)阔叶红松林和云冷杉林都是长白山气候顶极群落:(2)交错区具有过渡性质:(3)森林群落的分化结果说明演替的方向受局部生境的影响。图1表3参24。 相似文献
14.
15.
Hideyuki SHIMIZU 《中国林学(英文版)》2011,13(3):189-197
Picea mongolica W. D. Xu is an endemic and endangered species which is only found in semi-arid areas of northern China. It has been widely used as an afforestation tree in the establishment of the Three-North Shelterbelt System for its adaptation to arid soils and as a virescent tree in urban gardens and streets for its beautiful shape. Due to different microenvironments, P. mongolica populations may differentiate into many ecological groups with different adaptive abilities. Long-term adaptation to a dry environment makes P. mongolica differentiate into different ecotypes. Typical ecotypes are P. mongolica f. purpurea (Fp), P. mongolica f. rubra (Fr) and P. mongolica f. viridis (Fv). Our results show that cone size is clearly not uniform among different ecotypes; the largest cones are found in the Fv ecotype and the smallest in Fp. There were also distinct differences between these ecotypes in terms of height and length of squama. At the molecular level, the zymograms of peroxidase and lipase prove the existence of different ecotypes in P. mongolica. The results are useful for investigating and managing this rare spruce species in China. 相似文献