Seed crops are collected from both natural stands and plantations which may have been culled to form seed stands . 种子采自天然林和人工林，两者都可能是经过去劣留优作为母树林的。
2.
For smoke, which is the london ivy, had so wreathed itself round peffer's name, that the affectionate parasite quite overpowered the parent tree . 因为浓雾伦敦的长春藤，早已把佩弗的名字缭绕起来，这种痴情的寄生植物，竟然压倒了它的母树。
3.
Quantitative analysis of morphological differentiation and phylogenetic relationship among three species of distylium in chongqing 重庆蚊母树属物种形态分化及种间亲缘关系的分析
4.
For smoke , which is the london ivy , had so wreathed itself round peffer ' s name , that the affectionate parasite quite overpowered the parent tree 因为浓雾? ?伦敦的长春藤，早已把佩弗的名字缭绕起来，这种痴情的寄生植物，竟然压倒了它的母树。
5.
The paper also studied the survivorship , early growth and leaf photosynthetic characteristics of kandelia candel seedlings planted in the tidal mangrove area of zhangjiang estuar y of yunxuao , fujian 由花期转入果期的木榄繁殖体，种子不经休眠而在母树上发芽并从果实中伸出胚轴。
6.
Seeds , no matter it is from common maple or unique maple varieties , are mostly used as grafting rootstocks because they usually can not reproduce exactly the same unique characteristics as the parent tree 不管种子是来自一般的枫树或特别的枫树品种,因为通常他们无法再确切地长出与母树相同的独特特症,所以大都被用来作为嫁接的小苗
7.
Tests in korean pine seed stands in linkou forest bureau have approved that prescribed burning is an effective measure for the prevention of forest fires and the safety of korean pine seed stands , as well as for the control of forest diseases and insects and the promotion of the tree growth 林口林业局通过对红松母树林下的细小可燃物进行计划烧除实验，证明这种方法不但是预防森林火灾、保证红松母树林安全的有效措施，而且还可消除森林病害虫和增加林木生长量。
8.
Previous researchers have always determined the sp atial distribution patterns ( sdp ) of castanopsis kawakamii with a sample - dis tance method . however , the distribution patterns may be affected by the quadrat si ze and , in the course of analysis , the density differences among the cluster plots are not considered ; therefore , differences of cluster plot size and the dispersi on degree among individuals of cluster plots can not be known . authers of this pa per have determined the spatial distribution patterns of castanopsis kawakamii population in different habitats by means of non - quadrat distance method and a nalysed the pattern intensity and grain of the sdp . the pattern intensity is defi ned with the relative density differences and the pattern grain can embody the d ispersion degree of the individuals in the plots , and the dispersion degree among the plots . the determined results are as follows . the intensities of the species range in order from strong to week : litsea mollifolia p . kawakamii i . purpure a r . cochinchinensis c . kawakamii c . carlessii d . oldphamii s . superba . the gra ins of the species queue in order from coarse to close : s . superba = litsea mollif olia r . cohinchinensis c . kawakamii = i . purpurea c . carlessii p . racemosam d . oldp hamii . these determined results tally basiclly with the results authers of this paper have got in determining the same plots by means of aggregate index access ing method . in view of this , it is held that the sdp of c . kawakamii is closely related to the habitats and biological features 前人都是采用样方方法对格氏栲种群数量的空间格局进行测定，而格局分布有可能受样方大小的影响，且分析过程中没有涉及聚块间密度差的问题，因而无法掌握种群的聚块大小差别及聚块内个体间的离散程度.本研究采用无样方距离法，测定不同生境的格氏栲种群空间格局，分析格氏栲种群格局的强度和纹理.强度以聚块和间隙的密度差来定义，纹理则是体现聚块内个体间的离散程度与诸聚块间的分离程度.测定结果表明，格氏栲种群格局强度从高到低排列次序为：木姜子蚊母树冬青茜草树格氏栲米槠虎皮楠木荷；格局纹理从粗到细的顺序是：木荷=木姜子茜草树格氏栲=冬青米槠蚊母树虎皮楠.这一测定结果与作者采用聚集度指标测定相同样地格氏栲种群空间格局的结果基本相符.因此，格氏栲空间格局类型及分布与格氏栲生物学特性及生境的关系密切
9.
Forests for special uses : forests and trees mainly aimed at national defense , environmental protection and scientific experiments , inclusive of national defense forests , experimental forests , parent stands , environmental protection forests , scenic beauty forests , trees for sites of historical interests and the forests of natural protection areas （五）特种用途林：以国防、环境保护、科学实验等为主要目的的森林和林木，包括国防林、实验林、母树林、环境保护林、风景林，名胜古迹和革命纪念地的林木，自然保护区的森林。
10.
The propagules of b . gymnorrhiza and a . corniculatum undergo some growth before becoming detached from the parent plant . they accumulated large amounts of ions during the development while the level of ion concentrations are consistently lower in their embryos compared to leaves of parent plant . before detachment , the growth of hypocotyls were reduced , the water content declined , while the osmotic potential was approaching to or more negative than that of the solution on which their parent plant vegetating 另一方面维持较大比例的有机渗透调节剂，控制细胞液中盐离子的水平以减少代谢毒害；木榄成熟胚轴的密度接近或低于生境中海水的密度，适于随水漂浮和传播；胚轴内离子浓度呈下降趋势，但最终以达到和母树生境中的离子浓度水平相一致为目标。
