Project Update: May 2015 Work report



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Project Update: May 2015


    1. Work report

From October 2014 to April 2015, we completed the data collection in fieldwork and data analysis. The results are as follows:




  1. We analysed the status of red-listed tree species across differently protected zones in the Ta Xua Nature Reserve in north-western Vietnam, a rarely studied region located within a biodiversity hotspot. The study area covered an altitudinal range of 1000 to 1700 m asl and comprised: an undisturbed core zone; a low intensity traditional forest use buffer zone; and a forest restoration zone.

  2. In total, 18 red-listed tree species were recorded, of which 10 species are listed in different threatened degrees of the IUCN Red List and 16 species are listed in high conservation concern in the Vietnam Red List. Red-listed tree species richness (IUCN and Vietnamese Red Lists combined) amounted to 16 in the core zone, 10 in the buffer zone and five in the restoration zone. Most red-listed species, such as Fokienia hodginsii, reached their highest densities in the core zone, but one species (Quercus platycalyx) was quite abundant in the restoration zone.

  3. The multivariate analysis (canonical correspondence analysis (CCA)) was used to determine which ecology and human disturbance factors have strong effect on the appearance of threatened tree species. We found that for some red-listed tree species, canonical correspondence analysis suggested relationships between the presence of footpaths, canopy closure and basal area, which points to reduced abundance of red-listed tree species as a consequence of human activities.

  4. In the present study, the high number of red-listed tree species in the core zone illustrates the merits of strict protection measures, while the low number of red-listed tree species in the buffer and restoration zones indicates that these species are sensitive to selective logging and shifting cultivation. From a conservation point of view, low selective logging intensity seems to represent a better protection measure for threatened species than shifting cultivation.

    1. Future time and work schedule




      1. The results from this study will be presented and discussed with management committee of Ta Xua Nature Reserve, local rangers and local people.

      2. We are going to write a manuscript about the red-listed tree species abundance in differing levels of protection in the Ta Xua Nature Reserve in north-western Vietnam.



Table 1: Number of individual trees with DBH ≥ 6cm and conservation status of red-listed tree species. The results from 40 sample plots (20x20m) per each conservation zone.


No.

Scientific name



Species code

Vietnamese name

Number individuals

(dbh ≥ 6cm)

Conservation statusa

Core zone

Buffer zone

Re. zone

VN red list

IUCN

1

Aglaia spectabilis (Miq.) S.S. Jain & S.S.R. Bennet

Agla

Gội nếp

12

1

1

VU

LC

2

Canarium pimela K.D:Koenig

Canar.

Trám đen




1




VU

nl

3

Castanopsis cerebrina (Hickel & A.Camus) Barnett

Ca.cer

Sồi phảng

4

13

9

EN

nl

4

Castanopsis lecomtei Hickel & A.Camus

Ca.lec

Cà ổi Sapa

3

10




VU

nl

5

Castanopsis purpurella subsp. purpurella

Ca.pur

Dẻ gai đỏ

3







VU

nl

6

Castanopsis tessellata Hickel & A.Camus

Ca.te

Cà ổi lá đa

2







VU

nl

7

Cinnadenia paniculata (Hooker f.) Kostermans

Cinnade.

Kháo xanh

12




1

VU

nl

8

Cinnamomum balansae Lecomte

Cinnamo.

Vù hương




1




VU

EN

9

Dacrycarpus imbricatus (Blume) de Laub.

Dacry.

Thông nàng

2

2




nl

LC

10

Fokienia hodginsii (Dunn) A. Henry & H. H. Thomas

Fokie.

Pơ mu

11

4

1

EN

VU

11

Goniothalamus macrocalyx Bân

Gon.

Màu cau trắng

1







VU

VU

12

Lithocarpus vestitus (Hickel & A.Camus) A.Camus

Li.ves

Sồi lông nhung

3







EN

nl

13

Madhuca pasquieri (Dubard) H.J.Lam

Madhu.

Sến mật

35

2




EN

VU

14

Magnolia baillonii Pierre

Ma.bai

Giổi găng

1







VU

LC

15

Magnolia balansae A.DC.

Ma.bala

Giổi lông

1

2




VU

DD

16

Magnolia braianensis (Gagnep.) Figlar

Ma.bra.

Gổi nhung

1







EN

DD

17

Podocarpus neriifolius D.Don

Pod.

Thông tre lá dài

1







nl

LC

18

Quercus platycalyx Hickel & A.Camus

Qu.plat

Dẻ cau

7

7

29

VU

nl

Total

99

43

41

 

 

a Based on the Vietnam Red List and the IUCN Red List

VU vulnerable, EN endangered, LC least concern, DD data deficient, nl not listed.



Figure 1: Canonical correspondence analysis (CCA) shows the correlations between environmental and human disturbance variables and density red-listed tree species which were encountered more than once in the core and buffer zones. The first and the second axes explained 7.3%, and 5.8% of the variance of present data, respectively. Correlation threshold r2= 0.26. (BA = basal area, Fpath = footpath, abbreviation for species code as in Table 1).


    1. Some pictures

Picture 1: Forest landscape in the core zone of Ta Xua nature reserve at elevation approximately 1400 m to 1600 m a.s.l


Picture 2: Reconnaissance survey with some rangers and indigenous people


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