Shijiazhuang, China
Shijiazhuang, China

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Lu N.,Beijing Forestry University | Dai L.,Beijing Forestry University | Dai L.,Hebei Academy of Forestry | Wu B.,Beijing Forestry University | And 5 more authors.
Euphytica | Year: 2015

To explore the feasibility of intra specific hybridisation between Robinia pseudoacacia (common diploid) and other Robinia varieties, tetraploid R. pseudoacacia, R. pseudoacacia var. decaisneana (Carr.) Voss., R. pseudoacacia Frisia, and R. pseudoacacia “Idaho” were collected as male parents, and hybridisation trials were conducted over a period of three consecutive years. The average seedling emergence rates of the five hybridised combinations were ~2.3,2.0, 3.3, 1.3, and 0 % per year, respectively. To ensure maximum seedling emergence rates, we found that the best pollinating times were the blooming days. To investigate the causes of low crossability, we also examined pollen-tube growth and fruit setting rates. The results indicated that the causes of low crossability were abnormal pollen-tube growth, failed development of fertilised ovule, and poor seed germination. Low fruit-setting rates caused by emasculation may also lead to low crossability. © 2015 Springer Science+Business Media Dordrecht


Lu N.,Beijing Forestry University | Dai L.,Beijing Forestry University | Dai L.,Hebei Academy of Forestry | Wu B.,Beijing Forestry University | And 5 more authors.
Euphytica | Year: 2015

To explore the feasibility of intra specific hybridisation between Robinia pseudoacacia (common diploid) and other Robinia varieties, tetraploid R. pseudoacacia, R. pseudoacacia var. decaisneana (Carr.) Voss., R. pseudoacacia Frisia, and R. pseudoacacia “Idaho” were collected as male parents, and hybridisation trials were conducted over a period of three consecutive years. The average seedling emergence rates of the five hybridised combinations were ~2.3,2.0, 3.3, 1.3, and 0 % per year, respectively. To ensure maximum seedling emergence rates, we found that the best pollinating times were the blooming days. To investigate the causes of low crossability, we also examined pollen-tube growth and fruit setting rates. The results indicated that the causes of low crossability were abnormal pollen-tube growth, failed development of fertilised ovule, and poor seed germination. Low fruit-setting rates caused by emasculation may also lead to low crossability. © 2015, Springer Science+Business Media Dordrecht.


Wu Z.,Beijing Forestry University | Wu Z.,Cina National Bamboo Research Center | Zhang Z.,Beijing Forestry University | Wang Z.,Forestry Technology Promotion Stations of Henan Province | And 2 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2010

Simple sequence repeat (SSR) molecular marker systems were used to analyze the genetic diversity and genetic structure of 8 natural populations of Pistacia chinensis. Based on establishment of optimized PCR reaction system, nine pairs of SSR primers were selected from the primers which were designed for Pistacia vera L. Totally, 43 alleles at average of 4.78 for per locus were observed in the 8 populations and the average of polymorphic locus percentage (P) was 90.28%. The average of effective allele number per locus was 2.08, and the average of expected heterozygosity was 0.472, which showed the total genetic diversity of the populations at a moderate level. According to effective allele number and expected heterozygosity, the genetic diversity of the 8 populations from high to low were AK>TX>SP>HX>LY>LC >LZ>SX. The proportion of genetic differentiation among the populations accounted for 0.319, which indicated that P. Chinensis's variation mainly resulted from variation among populations. The 8 populations were divided into three types according to genetic distance. Fig 2, Tab 5, Ref 17.


Qie G.-F.,Chinese Academy of Forestry | Ren Q.-W.,Hebei Academy of Forestry | Li W.,Beijing Tsinghua Urban Planning and Design Institute | Yang Y.,Chinese Academy of Forestry | Wang C.,Chinese Academy of Forestry
Chinese Journal of Ecology | Year: 2011

Taking three types of residential areas in Beijing as the objects, this paper analyzed the tree species composition, relative important value, and three-dimensional configure in diameter at breast height (DBH), height, and crown coverage. In all types of the residential areas, there existed common key tree species, and also, unique dominant species. Populus tomentosa, Sophora japonica, and Platycladus orientalis were the common key species with higher important value; tall and straight species Paulewnia fortunei, Cedrus deodara, P. canadensis, and Ginkgo biloba were the important species in enterprise-institution residential areas; traditionally native species such as Ailanthus altissima, Fraxinus chinensis, and Ziziphus jujube were the essential components in Hutong residential areas; and excellent landscape tree species such as Robinia pseudoacacia, Pinus tabulaeformis, Salix babylonica, and S. japonica cv. Pendula had valuable traits in mixed residential areas. As for the tree species three-dimensional configure, the overall distribution in DBH, height, and crown coverage in the three types of residential areas all presented a great development potential, being still at a rapid growth phase. With larger green space, enterprise-institution residential areas had significantly higher tree density, crown coverage, average DBH, and height than the other two types of residential areas; due to the limited green land, Hutong residential areas were difficult to increase the green biomass to a higher level; whereas mixed residential areas had considerable potential in the increase of green space.

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