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Lu J.,Research Institute of Tropical Forestry
Wei sheng wu xue bao = Acta microbiologica Sinica

We identified four strains of plant growth-promoting bacteria (PGPB) and their plant growth-promoting ability. Four PGPB strains were genetically analyzed by PCR detection of nifH and 16S rRNA gene. Phosphate-solubilizing and nitrogen-fixation capacity were examined by spectrophotometric quantification and acetylene reduction assay, respectively. Effect of strain inoculation on plant growth was also evaluated. Phylogenetic analysis based on nifH and 16S rRNA gene sequences indicated that strain HN011 was mostly related to Vibrio natriegens, and SZ7-1 and SZ7-2 resembled Klebsiella oxytoca. Although similarity of 16S rRNA sequence showed that SZ002 belongs to Paenibacillus sp., nifH gene of SZ002 had high sequence similarity with Klebsiella genus. Phosphate solubilization showed that insoluble phosphate was well solubilized in the liquid medium by all four strains of PGPB, which also had high nitrogen-fixation capacity. Plant dry weight, total N and total P were higher in some inoculated than in the non-inoculated plants (P < 0.05). Our results showed that all four strains of PGPB isolated from mangrove had both phosphate solubilization and nitrogen fixation ability, resulting in beneficial effects on growth. Source

Peng P.,South China Agricultural University | Li K.,South China Agricultural University | Liang K.,Research Institute of Tropical Forestry | Xu K.,South China Agricultural University
Advanced Materials Research

In order to understand the effects of geographical provenances of teak on wood properties and improve the quality of afforestation in china, research was carried on wood properties of eight provenances of teak at age 27 in Ledong Country, Hainan Island. The slices revealed that the constructional characteristics from different geographical provenances of teak were very similar. But the effect of geographical provenance on teak wood properties was highly significant. The relationship results for properties of teak showed that properties of most wood species had the obvious relation with basic density, which can be used to guide the selection of the teak provenance in the early planting to improve the quality of teak. © (2012) Trans Tech Publications. Source

Lu J.K.,Research Institute of Tropical Forestry | Dou Y.J.,Research Institute of Tropical Forestry | Zhu Y.J.,Research Institute of Tropical Forestry | Wang S.K.,Research Institute of Tropical Forestry | And 2 more authors.
International Journal of Systematic and Evolutionary Microbiology

Three slow-growing rhizobial strains, designated RITF806T, RITF807 and RITF211, isolated from root nodules of Acacia melanoxylon grown in Ganzhou city, Jiangxi Province, China, had been previously defined, based on amplified 16S rRNA gene restriction analysis, as a novel group within the genus Bradyrhizobium. To clarify their taxonomic position, these strains were further analysed and compared with reference strains of related bacteria using a polyphasic approach. According to 16S rRNA gene sequence analysis, the isolates formed a group that was closely related to 'Bradyrhizobium rifense' CTAW71, with a similarity value of 99.9 %. In phylogenetic analyses of the housekeeping and symbiotic gene sequences, the three strains formed a distinct lineage within the genus Bradyrhizobium, which was consistent with the results of DNA-DNA hybridization. In analyses of cellular fatty acids and phenotypic features, some differences were found between the novel group and related species of the genus Bradyrhizobium, indicating that these three strains constituted a novel group distinct from any recognized species of the genus Bradyrhizobium. Based on the data obtained in this study, we conclude that our strains represent a novel species of the genus Bradyrhizobium, for which the name Bradyrhizobium ganzhouense sp. nov. is proposed, with RITF806T (= CCBAU 101088T = JCM 19881T) as the type strain. The DNA G+C content of strain RITF806T is 64.6 mol% (Tm). © 2014 IUMS. Source

Liao B.-W.,Research Institute of Tropical Forestry | Zhang Q.-M.,CAS South China Sea Institute of Oceanology
Wetland Science

This paper systematically summarized the change characteristic of mangroves and their species composition. The geographical distribution of mangrove plants and their growth status are greatly affected by many external factors, including air temperature, ocean currents, waves, bank slopes, salinity, tides, and sediment and so on. Mangroves in China are mainly distributed in the southeast coast of the tropical and subtropical coastal bays, estuaries and other areas under waters. From Hainan Island towards the north, climate zones extend from central tropical zone (the south of Hainan Island), to northern tropical zone (the north of Hainan Island, south of Leizhou Peninsula and Taiwan Island), to southern subtropical zone (Guangxi province, Guangdong province, Fujian province, the south of Taiwan Island and southern coastal areas of Fujian province), to northern subtropical zone (the north of Fujian province and coastal areas of Zhejiang province). The area and population diversity of mangrove plants decline significantly with increasing latitudes, and forest stand also transforms from arbor to shrub, which fully demonstrated the macroscopically control effect of air temperature for the geographical distribution of mangrove plants. In terms of mangrove cover change, the total area of mangroves in China has been dramatically shrunk from 250 thousand ha in history, to 42 thousand ha in 1950, and to 22.8 thousand ha in 2001. In 2001, descending order of existing area of mangroves in China's major provinces is: Guangdong province (9 084.0 ha), Guangxi province (8 374.9 ha), Hainan (3 930.3 ha), Fujian province(615.1 ha), Hong Kong Special Administrative Region (510 ha), Taiwan province (278 ha), Zhejiang province (19.9 ha), Macau Special Administrative Region (60 ha). For the species composition of mangrove plants, adding 2 species (Sonneratia apetala and Laguncularia racemosa) of successful introduced true-mangrove plants from abroad, now there is total 38 species of mangrove plants in China, including 26 species of true-mangrove plants and 12 semi-mangrove plants. Source

Tong F.-C.,University of South China | Xiao Y.-H.,Research Institute of Tropical Forestry | Wang Q.-L.,CAS Shenyang Institute of Applied Ecology
Journal of Forestry Research

Soil nematode communities were investigated in the Changbai Mountain in Broad-leaved Korean Pine forest, Korean Pine and spruce-fix mixed forest, Dark Coniferous forest, Erman's birch forest and Alpine tundra along different altitude gradients from 762 m to 2 200 m a. s. l. Soil animal samples were collected from the litter layer and the soil depth of 0-5 cm, 5-10 cm and 10-20 cm at each site in the spring of 2001 and 2002. In total 27 nematode families and 60 genera were observed. The dominant genera were Plectus Bastian and Tylenchus Bastian and most of them live in litter layer. The total number of soil nematode was significantly correlated with soil moisture (r=0.357; p<0.01). Nematodes were classified in bacterivores, fungivores, plant parasites, omnivores-predators, and omnivores according to known feeding habitats or stoma and esophageal morphology. Species richness of fungivorous nematode was higher than others in different vegetation communities and soil depths. The total number of soil nematode and trophic groups varied significantly (p<0.05) in response to different soil depths. The fungivore/bacterivore ratio (F/B) and the ratio of (fungivores + bacterivores)/plant-parasites (WI) also changed significantly (p<0.05) in different soil depths. In conclusion, soil moisture is proved to be one of the most important variables affecting nematode density and trophic composition, and the altitude gradient does not significantly affect the ecological indices of soil nematode such as trophic diversity (TD) and the Shannon index (H′). © Northeast Forestry University and Springer-Verlag Berlin Heidelberg 2010. Source

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