He J.,Beijing Forestry University |
Zhao X.,Beijing Forestry University |
Zhang C.,Beijing Forestry University |
Jia Y.,Sichuan Academy of Forestry Science |
And 4 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2011
The ice and snow damages to the evergreen broad-leaved forest in the Jiulianshan National Nature Reserve in Jiangxi, China were studied, and the correlations between damage degrees with tree characteristics and topographical factors were analyzed. The results showed: The forest was dominated by Castanopsis species (DBH 10 cm), and Pinus massoniana (PM), C. carlesii (CC), C. fargesil (CF), and CC were found highest for top breakage ratio (TOB), trunk breakage ratio (TRB), uprooting ratio (UR) and mean damage index (MDI); while Machilus thunbergii (MT), CF, Liquidambar formosana (LF), and Diospyros morrisiana (DM) were lowest. The TOB had extremely significantly positive correlation with DBH (F<0.01), H (PO.01), and extremely significantly negative correlation with H/DBH (P<0.01); TRB had extremely significantly negative correlation with DBH (P<0.01); UP had extremely significantly negative correlation with DBH (P<0.01); and MDI was not significantly correlated with DBH, H, and H/DBH (F>0.05). The TOB was the highest under the conditions of DBH 50 cm, 21 ≤H<23 m or 20≤H/DBH<40, and the lowest with 10≤DBH<12 cm, 5≤H<7 m or H/DBH 120; the TRB was the highest under the conditions of 10≤DBH<12 cm, 13≤H<15 m or 100≤H/DBH<110, and the lowest with 42≤DBH<44 cm, 7≤H<9 m or H/DBH 120; the UR was the highest under the conditions of 20≤DBH<22 cm, 11≤H<13 m or 90≤H/DBH<100, and the lowest with 36 ≤DBH<38 cm, DBH 40 cm, 5≤H≤7 m, H 27 m, 20≤/H/DBH<40 or /V/DBH 120. At the mean damage degree, the MDI was the highest under the conditions of 22≤DBH<24 cm, 15≤H<17 m or 100≤H/DBH<110, and the lowest with 40≤DBH<42 cm, 5≤H<7 m or H/DBH 120. The TRB ratio or MDI in different aspect classes had extremely significantly positive difference (/><0.01), MDI was the highest under the condition of N-NE area. Every damage index in different slope classes had no significant difference (P>0.05), MDI was the highest under the condition of 30°∼40° area. Fig 4, Table 1, Ref 38.
Gao J.,Chengdu University of Traditional Chinese Medicine |
Gao J.,Key Laboratory Breeding Base of Co founded by Sichuan Province and MOST |
Zhang W.,Sichuan Academy of Forestry Science |
Li J.,Sichuan Academy of Forestry Science |
And 3 more authors.
Biochemical Systematics and Ecology | Year: 2016
Phoebe zhennan S. Lee et F. N. Wei (Lauraceae), is the main source of Gold Phoebe, a rare and extremely valuable wood in China. However it has undergone a dramatic decline. In this study, we used 12 amplified fragment length polymorphism primer combinations to assay 92 accessions, which were highly representative of the entire P. zhennan germplasm. It revealed that P. zhennan consisted of three genetic populations, named as SCZ (central Sichuan), CQH (eastern Sichuan, Chongqin, Hubei and Hunan) and YG (Yunnan and Guizhou), probably owing to natural selection caused by topography differences. The CQH population further diverged into two geographical sub-populations: CD-CQ (SCD and west region of Chongqin) and HB-HN (eastern side of Chongqin, Hubei and Hunan). The loci were moderately polymorphic (40.4%). The genetic distance between SCZ and YG was the highest, between CD-CQ and HB-HN the lowest. Pairwise fixation indices (FΦPT) between any inferred populations were significant. This rare species exhibited low genetic diversity; therefore, the results provided significant data related to the conservation and management of P. zhennan. That is, with this genetic information, land managers are equipped with better tools allowing them to more effectively protect this species and its limited genetic diversity. © 2015 Elsevier Ltd.