HIỆN TRẠNG, XU THẾ VÀ DỰ BÁO BIẾN ĐỘNG ĐA DẠNG SINH HỌC RẠN SAN HÔ VÙNG VEN BỜ TỪ ĐÀ NẴNG ĐẾN BÌNH THUẬN

Hgi nghi Khoa hgc ky niem 35 ndm Vien Khoa hgc vd Cong nghe Viet Nam - Hd Ngi 10/2010

HIEN TRANG, XU THE VA DlT BAO BIEN D Q N G DA DANG SINH
HOC RAN SAN HO VUNG VEN BO TlT DA NANG DEN BINH THUAN
STATUS, TREND AND PREDICTION OF BIODIVERSITY OF CORAL
REEFS IN THE COASTAL WATERS FROM DA NANG TO BINH
THUAN
Nguyen Van Long, Vo SI Tuan, Hoang Xuan Ben,
Phan Kim Hoang, Hiia Thai Tuyen
Vien Hai duong hoc. So 01 - Ciu Da, Nha Trang, Khanh Hda
Email: nvanlong@dng. vnn. vn
Tom tat:
Tap hgp vd phdn tich cdc tu lieu khdo sdt tgi 9 khu vuc trong diim trong vimg
biin ven ba tir Dd Ndng den Binh Thuan dugc tiin hdnh trong nhiiu ndm qua
phdn dnh mdt thirc trgng rdng tinh trgng cdc rgn san hd trong khu vuc ndy khdng
cdn duy tri trong tinh trgng tdt. Do phii san hd sdng chi xip a mirc trung binh
(khodng 2I,l%-44,7%) vd mat dp cdc nhdm ngudn lgi cd gid tri thue phdm cao
(cd vd ddng vdt khdng xuang sdng lan) diu da bi khai thdc cgn kiet. Sd lieu so
sdnh theo thai gian giira giai dogn 1994-1997 vd 2004-2008 cho thdy cdc rgn san
hd bi suy gidm chdt lugng, trong dd sd lugng rgn cd chdt lugng tdt gidm tir 16,7
% xudng 10,7 %, rgn a mirc trung binh gidm tir 50 % xudng 39,3 % vd rgn cd
chdt lugng xdu tdng tir 0,0 % lin 17,9 %. Nhdm cd rgn cd kich thirac nhd (I10cm) tdng theo thai gian (ngogi trir viing ven ba Ninh Hdi-Ninh Thuan), trong
khi dd nhdm cd cd kich thuac Idm vd cd gid tri thue phdm cao lgi thi hiin xu
huang gidm (ddi vai nhdm kich thuac 11cm - 20cm) hoac khdng thay ddi (ddi vai
nhdm kich thirac > 20cm) do mat do cdn lgi qud thdp. Ngudn lgi ddng vgt khdng
xuang sdng lan diu the hiin xu thi thay ddi khdng rd rdng theo thai gian do mat
dg cdn lgi tren rgn qud thdp, ngogi trir sir gia tdng mat do tdm hiim, hdi sdm vd
cdu gai den tgi khu vuc Cii Lao Chdm. Kit qud du bdo trong giai dogn 5 ndm sdp
den (2011-2015) cdc rgn san hd trong viing biin ndy vdn tiip tuc bi suy thodi
ddng ki (trung binh 0,02-6,35%), trong khi dd tdc do phuc hdi du bdo vdo khodng
0,0 % - 7,89 % tiiy theo tirng khu vuc.

Abstract:
Data analysed from recent studies at nine key locations in the coastal waters
from Da Nang to Binh Thuan indicate that the coral reefs are not in good
condition. Cover of living corals ranged between 21.1-44.7% and density of target
resources offish and macro-invertebrates were extremely rare. Comparisons of
change betM'een the period of 1994-1997 and 2004-2008 show that the quality of
coral reefs declined from 16.7% to 10.7%) for the reefs in good condition, from
50% to 39.3% for the reefs in fair condition and increased from 0.0%> to 17.9%
for the reefs in bad condition. Density of small fish (1-IOcm in length) increased
with an exception of a decline being recorded in Ninh Hai - Ninh Thuan whereas
density of large and target fish declined for the fish at size class of 11-20cm or
were no change for the fish at size class of > 20cm between periods due to low
density. There were no changes in density of most of indicators of macroinvertebrates between periods due to low density remaining on the coral reefs
285


Tiiu ban: Khoa hgc cong nghe Bien

ISBN: 978-604-9I3-015-I

with an exception of increase in density of lobsters, seacucumbers and sea urchins
found at Cu Lao Cham. Predictions of the trend of change in the period of next
five years (2011-2015) indicate that the conditions of coral reefs in this area will
be significantly degraded with degradation rate ranging between 0.02 - 6.35%,
whereas recovery rate will be taken place between 0.0-7.89% depending on
locations.
Md dau
Ran san hd dugc tim thiy tren 100 qude gia va cac vimg lanh thd nam d nhiet ddi va
can nhiet ddi. Mac dii chilm dien tich khdng ldn (6 x 10^ km^) nhung hang nam ran san hd da
cung cip tren 10 % tdng san lugng nghe ca ciia the gidi [11].

C) Viet Nam, viec sir dung va khai thac tai nguyen he sinh thai rart san hd phuc vu cho
cac muc tieu phat triln kinh te - xa hdi da va dang ngay cang trd nen phd bien, Vi vay, cac ran
san hd ciing dang phai ddi mat vdi hang loat cac tac ddng bat lgi nhu khai thac qua miic, khai
thac buy diet, d nhiem, phat trien viing ven bd va tram tich, tai bien thien nhien, sir himg nd
ciia sinh vat dich hai, xam thue ciia hai mien tren pham vi toan qude hoac theo timg khu vuc
[17].
Vimg ven bd tir Da Nang den Binh Thuan dugc xem la khu vuc cd dieu kien thuan lgi
cho sir tdn tai va phat trien ciia cac ran san hd [17]. Trong nhirng thap ky vira qua, da cd nhieu
de tai nghien cuu va giam sat lien quan den ran san hd da dugc tien hanh trong vimg bien nay.
Vi vay, viec tap hgp cac ngudn tu lieu hien cd nham danh gia tinh trang suy thoai, xu the bien
ddng da dang sinh hoc va ngudn lgi lam co sd dir bao va de xuat cac phuang an phuc hdi tai
nguyen he sinh thai ran san hd d viing bien nay trong thdi gian sap den la het siic can thiet.
1. Tai lieu va phu'ong phap xu* ly so lieu
1.1. Ngudn tdi lieu sir dung
Cd the ndi rang cac nghien ciiu ve ran san hd theo dinh hudng bao tdn va khai thac
ben virng trong dai ven bien tir Da Nlng din Binh Thuan mdi chi dugc quan tam tir nhiing
nam 1993 cho den nay. Ngudn tu lieu sir dimg trong bao cao nay chii yeu dugc tap hgp va
tdng quan tir cac cdng trinh cdng bd, cac bao cao tdng kit va chuyen dl thudc cac dl tai, duan da dugc tien hanh tai khu vuc nay trong nhirng nam gin day d cac viing biin ven bd Da
Ning [3], Quang Nam [8, 15, 21], Binh Djnh [4, 16, 19], Phu Yen [14], Khanh Hda [1, 5, 17,
20], Ninh Thuan [6, 10, 13], Binh Thuan [9, 12].
1.2. Phdn tich vd xu ly so lieu
Do phuang phap nghien ciiu cd su khac nhau va mot sd khu vuc dugc khao sat lap lai
giiia cac de tai, di; an nen viec phan tich dii lieu thanh phin loai se dugc tap hgp o^ung cho tit
ca cac chuyin dilu tra. Dii vdi so lieu hien trang, chiing tdi chon ngudn sd lieu thu thap tir
cac de tai, du an thue hien trong nam gin nhit.
De thuan lgi cho viec so sanh va ddi chieu, ngudn sd lieu mat do cua ca ran va nguIn
lgi sinh vat day kich thudc ldn thu thap tir cac chuyin khao sat cua cac dl tai, du an se dugc
chuan hda vl cimg gia tri mat do (con/1 OOm^).
Phan chia chat lugng ran dugc dua theo tieu chuin cua English et al. (1997) [2]. Du
bao kha nang phuc hdi dugc tinh toan dua tren tie dp suy thoai trir cho tdc do phuc hdi trung

binh tai cac khu vuc dugc bao ve nghiem ngat trong 5 nam qua rdi nhan vdi dien tich du kiln se
dugc quan ly nghiem ngat theo kl hoach dl xuit va phe duyet tai cac khu vuc trong 5 nam tdi.
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Hgi nghi Khoa hgc ky niem 35 ndm Vien Khoa hgc vd Cong nghe Viet Nam - Hd Ngi 10/2010

2. Ket qua nghien ciru va thao luan
2.1, Hien trang ran san hd
Sd lieu do phu san hd sdng tai timg khu vuc trong viing bien Nam Trung Bd dao ddng
trong khoang 21,1-44,7% (trung binh 29,6 ± 2,5%), trong dd cac khu vuc cd do phii cao la
vjnh Ca Na {44,1%), ven bd Binh Djnh (35,7%) va cac khu vuc kha cd gia trj do phii kha
tuong duong nhau (Bang 1). Nhin chung, cac ran khu vuc phia nam tir Phii Yen [14] din Ninh
Thuan [10] cd do phii cua rong va thanh phan san hd vd vun cao ban so vdi cac khu vuc khac.
Dieu nay phan anh thirc trang rang cac ran san hd trong khu vuc nay dang phai chju nhieu tac
ddng va tinh trang suy thoai dien ra phd bien va cao hon so vdi cac khu vuc khac.
Sd lieu phan tich trong Bang 1 cho thay cd sir khac nhau kha ldn mat do ca ran giira
cac khu vuc trong viing biin Nam Trung Bd, dao ddng tir 87,3-140,5 con/1 OOm^ (trung binh
con/100m ), trong dd khu vuc vjnh Nha Trang va ven bd Da Nlng cd mat do cao nhit (tuong
ling 139,1 va 140,5 con/lOOm^). Hau het cac khu vuc trong vimg bien tir Da Nlng din Binh
Thuan uu the bdi nhdm ca canh (62,4-110,5 con/1 OOm^) nhung lai kem phong phu ciia nhdm
ca thirc phim (8,9-30,0 con/1 OOm^) va nhdm ca dir (0,4-5,8 con/1 OOm^). Cac khu vuc ven bd
Da Nang, Phii Yen va vjnh Nha Trang cd mat do cao ciia nhdm ca canh, cdn cac khu vuc cd
mat do cao cua nhdm ca thue pham va ca dii la Cii Lao Cham, ven bd Binh Dinh, Phii Yen va
vjnh Nha Trang.
Mat do cac nhdm ddng vat day ldn chi thj cd mat do thap, ngoai trir cau gai den. Mat
do dao ddng tir 4,8 din 95,4 con/lOOm^ (trung binh 35,0 ± 10,8 con/lOOm^), trong dd cao nhit
tai viing Da Nang va thap nhat la ven bd Ninh Thuan (Bang 1).
Bdng I. Do phii (%) san hd sdng vd mat do (con/100m ) cua mdt sd nhdm ngudn lgi
sinh vgt rgn san hd a cdc khu vuc chu yiu viing ven ba Nam Trung Bd.

TT

Khu w c

1
2
3
4
5
6
7
8
9

Da Nlng

So diem

•

Cii Lao Cham
Binh Dinh
Phu Yen
Van Phong
Nha Trang
Cam Ranh
Ninh Thuan
CaNa
Trung binh
s.e.

19
10
8
11
10
12
3
10
10

Do phii san ho
song
22,8
29,9
35,7
32,8
24,6
23,3
31,0
21,1
44,7
29,5
2,5

Mat do ca
ran
140,5
92,4
87,3

93,8
121,7
139,1
115,5
93,2
106,8
110,0
6,8

Mat do dong vat day
Idn
95,4
24,7
45,9
20,9
18,0
4,8
35,0
10,8

w

2.2. Bien dong da dang sinh hoc ran san ho
2.2.1. Do phii vd tinh trgng suy thodi
Phan tich sd lieu giam sat tai cac dilm cd dinh d Cii Lao Cham, vjnh Van Phong, vjnh
Nha Trang, ven bd Ninh Hai-Ninh Thuan va vjnh Ca Na cho thiy tinh trang cac ran san hd
khdng cdn trong dieu kien tdt va cd xu hudng suy giam chit lugng theo thdi gian. So ran cd
chit lugng tot giam tir 16,7% (giai doan 1994-1997) xudng 10,7% (2004-2008). Tuang tu sd
ran trung binh ciing giam tir 50% (1994-1997) xudng 39,3% (2004-2008). Sd ran rit xiu tang
287

ISBN: 978-604-913-015-

Tiiu ban: Khoa hgc cong nghe Bien

din tir 0,0% (1994-1997) len 17,9% (2004-2007). Dilu nay cho thiy ring ran san hd tai cac
khu vuc trong viing bien tir Da Ning den Binh Thuan dang diln biin theo chilu hudng xau di
va phin nhilu trong sl dd bj suy thoai dang ke.
Sd lieu biin ddng do phu ciia 3 thanh phan chinh tren ran (gdm san hd sdng, san ho
Cling va san hd mim) phan anh thue trang la hau het cac ran san hd diu bj suy giam ve chat
lugng trong vdng 14 nam qua, trong dd muc do suy giam do phii ciia san hd sdng dao ddng
2,8-16,8% (trung binh: 9,7%), san hd cirng giam 2,7-13,1% (trung binh 7,5 %) ya san hd mem
giam 0,1-6,4 % (trung binh 2,1 %) (Bang 2). Nhin chung, cac ran san hd tai hau het cac khu
vuc cd xu hudng giam manh do phii san hd sdng, dac biet san hd cimg trong giai doan 1994 1997 din giai doan 2000-2004 nhung lai giam rit it trong giai doan tir 2004-2008, ngoai trir
khu vuc Cii Lao Cham giam manh trong giai doan tir 2004-2008.
cac phan tich va tinh toan tic do suy thoai cua ran san hd trung binh hang nam cho
toan viing biin la 0,99% ddi vdi san hd sdng, 0,83% dii vdi san hd ciing va 0,18% ddi vdi san
hd mim. Cac khu vuc cd tic do suy thoai cao la ven bd Ninh Hai - Ninh Thuan, vjnh Nha
Trang va Cii Lao Cham (1,20-1,26%/nam), khu vuc vjnh Van Phong va vjnh Ca Na cd tdc do
suy thoai < 1%/nam. Cac phan tich va tinh toan tic do suy thoai ciia ran san hd trung binh
hang nam cho toan viing biin la 0,99% ddi vdi san hd sdng, 0,83%) ddi vdi san hd cung va
0,18% dii vdi san hd mim. Cac khu vuc cd tdc do suy thoai cao la ven bd Ninh Hai - Ninh
Thuan, vjnh Nha Trang va Cii Lao Cham (1,20-1,26%/nam), khu vuc vjnh Van Phong va vjnh
ca Na cd tic do suy thoai < 1%/nam. Ddi vdi viing bien Nha Trang va ven bd Ninh Hai Ninh Thuan, sir suy thoai chii yeu la do cac tac ddng nhu lang dong tram tich, biing nd sinh
vat djch hai (Sao Bien gai va 6c gai Drupella), neo dau tau thuyen, du Ijch [7, 17]. Sir suy
giam nhanh do phii d viing bien Cii Lao Cham chii yeu do tac ddng true tiep cua 2 can bao
Xansang va Cimeron va lugng nude ngot vdi ham lugng tram tich cao tai ra tir sdng Thu Bdn
vao nam 2006 [8].
Bdng 2. Su suy gidm do phii trung binh cua san hd tgi cdc khu vuc gidm sdt viing ven ba Nam

Trung Bd theo thai gian.
TT Khu virc

So
diem

Do phu san
ho song (%)

Do phu san
ho cifng (%)

Do phu san
hd mem

Khoang
thoi gian

(%)

1

Cii Lao Cham

5

-16,8

- 10,4

-6,4

1994-2008

2

van Phong

5

-2,8

-2,7

-0,1

2003-2006

3

Nha Trang

8

-16,2

-13,1

-3,1

1994-2007

4

Ninh Thuan

6

-6,3

-6,5

0,2

2002-2007

5

CaNa

5

-6,3

-4,9

-1,4

1995-2006

2.2.2. Cd rgn san hd
Sd lieu giam sat tai cac khu vuc tir 1994 din 2008 cho thay mat do trung binh tdng sd
va nhdm ca kich thudc 1 -10cm cd xu thi tang theo thdi gian d hau het cac khu vuc, trir vimg
ven bd Ninh Hai - Ninh Thuan cd xu hudng giam. Dii vdi nhdm ca kich thudc 11-20cm cd
xu hudng giam vl mat do d Cii Lao Cham va Ca Na nhirng lai tang tai Ninh Hai - Ninh
Thuan, vinh Nha Trang va vjnh Van Phong (Hinh 1). Xu the bien ddng mat do cua nhdm ca
kich thudc > 21cm khdng rd rang do mat do tai cac dilm ran giam sat qua thap. Mat do nhdm
ca thue phim (target fishes) va nhdm ca dii (predatory fish) cd xu hudng giam hoac khdng
288


Hgi nghi Khoa hgc ky niem 35 ndm Vien Khoa hgc vd Cong nghe Viet Nam - Hd Ngi 10 2010

thay ddi d hau het cac khu vuc, trir vjnh Van Phong. Ngugc lai, nhdm ca canh (ornamental
fishes) lai cd sir gia tang mat do theo thdi gian, ngoai trir khu vuc ven bd Ninh Hai - Ninh
Thuan.
• 1994-95 S2002 H 2003 ^ 2 0 0 4 S 2005 ffl 2006 0 2007 • 2 0 0 8
800 1
600
o
o
400 -

%

200 4

IB

i

n
Van Phong

Cu Lao Cham

Nha Trang

Ninh Thuan

CaNa

Hinh I: Biin ddng mat do tdng sd cd rgn san hd tgi mot sd khu vuc gidm sdt trong viing biin
tir Dd Ndng din Binh Thuan theo thai gian.
2.2.3. Ddng vdt ddy kich thuac lan (Macro-invertebrates)
cac phan tich va so sanh mat do ciia mot sd nhdm sinh vat chi thj theo thdi gian cho
thay ngudn lgi ddng vat day kich thudc ldn tren cac ran san hd trong viing bien tir Da Nang
den Binh Thuan cdn lai khdng dang ke, ngoai trir cau gai den {Diadema spp.). Mat do ciia trai
tai tugng {Tridacna spp.) giam ddi chut hoac khdng thay ddi do cdn lai qua it (< 1
con/100m ), trong dd giam dang ke nhat tai Cii Lao Cham. Tuong tu, dc dun {Trochus spp.)
hien dien vdi mat do rat thap va ciing phan anh xu the thay ddi khdng rd rang d tat ca cac khu
vuc. Mat do tdm hiim {Panulirus spp.) va Tdm Bac sT {Stenopus hispidus) cung cd mat do rat
' r

' \

'

r

-y

thap d hau het cac nam giam sat (< 0,2 con/100m ), trong dd khu vuc vjnh Ca Na va Cii Lao
Cham cd mat do tdm hiim cao nhat. Nhin chung, sir thay ddi mat do cua tdm hum va Tdm Bac
sT the hien khdng rd rang do mat do cdn lai tren ran qua thap, ngoai trir sir gia tang mat do cua
tdm hiim tai khu vuc Cii Lao Cham (tir 0,0 con/1 OOm^ vao nam 2002 len 1,2 con/1 OOm^ vao
nam 2008). Mat do hai sam cd gia trj thue pham rat thap d hau het cac nam giam sat (trung
'

-y

\

'

'

-y

binh < 0,5 con/100m ) va tang dan theo thdi gian tai Cii Lao Cham (tir 0,5 con/100m trong
nam 2002 len 2,1 con/1 OOm^ vao nam 2008). Cau gai den giam dang ke hoac it thay ddi mat
do theo thdi gian d hiu het cac khu vuc, trir sir gia tang d Cii Lao Cham va giam d vjnh Van
Phong, vjnh Nha Trang. Mot sd chi tieu khac theo nhu Oc Tii va {Charonia tritonis), Cau Gai
Biit chi {Heterocentrotus mammilatus) va Cau Gai So dira {Tripneustes gratilla) deu khdng
dugc ghi nhan tren cae mat cat giam sat d tat ca cac khu vuc theo thdi gian.
2.3. Du" bdo xu the bien dgng vd khd ndng phuc hdi
Kit qua phan tich sd lieu do phii san hd sdng trong cac khu vuc dugc quan ly nghiem
ngat giai doan 2003-2008 cho thay sir gia tang do phii san hd sdng chi dugc ghi nhan tai vjnh
Nha Trang (trung binh tang 0,16%/nam), trong khi dd gia tri nay giam d Cii Lao Cham (3,98%/nam) va Ninh Hai-Ninh Thuan (-0,68%/nam).
Nhu vay cd the du bao rang trong giai doan tir 2010-2015, khu vuc Cii Lao Cham cd

toe do phuc hdi cao nhat (7,89 %) so vdi tic do suy thoai cua giai doan 2002-2008, tiep theo
la viing ven bd Ninh Hai - Ninh Thuan (5,41%) va vjnh Nha Trang (1,17%), trong khi dd khu
vuc vjnh van Phong va vjnh Ca Na cd tie do phuc hdi khdng dang kl (0,0-0,12%) (Bang 3).

289


Tieu ban: Khoa hgc cong nghe Bien

ISBN: 978-604-913-015-

Bang 3. Du bdo tdc do suy thodi hdng ndm tgi cdc khu vuc trong diim viing ven ba tic
Dd Ndng din Binh Thuan giai dogn 2010-2015.
T
T

Khu vuc

Toe do suy
thoai giai doan
2002-2008 (%)

Toe do suy
thoai giai doan
2010-2015 (%)

Toe do phuc
hoi giai doan
2010-2015 (%)

1

Cii Lao Cham

- 14,24

-6,35

7,89

2

van Phong

-3,50

-3,50

0

3

Nha Trang

-2,97

-1,80

1,17

4

Ninh Thuan

-6,25

-0,84

5,41

5

caNa

-0,14

-0,02

0,12

Ket qua tinh toan trong Bang 3 ciing phan anh mdt thue trang rang trong giai doan 5
nam sap den, ran san hd tai cac khu vuc trong diem trong viing ven bd tir Da Nang den Binh
Thuan van tiep tuc bj suy thoai dang ke, cao nhat la Cii Lao Cham (-6,35%), trung binh: -1,27
%/nam) va tiep theo la vjnh Van Phong (-3,5%, trung binh: -0,7%)/nam), vjnh Nha Trang (1,80%, trung binh: -0,36%/nam). Khu vuc ven bd Ninh Hai-Ninh Thuan va vjnh Ca Na cd tic
do suy thoai du bao thap nhat, tuong ling -0,84% (trung binh: -0,17%)/nam) va -0,02% (trung
binh: -0,004%/nam).
3. Nhan xet
- Tinh trang cac ran san hd trong vimg bien ven bd tir Da Ning din Binh Thuan khdng
cdn duy tri trong dieu kien tdt va dang trong tinh trang bj suy thoai d nhilu nai. Do phii san
hd sing chi dat Ichoang 21,1 - 44,7 % (trung binh 29,6 ± 2,5 %). Ngudn lgi sinh vat ran, dac

biet cac nhdm ddi tugng cd gia trj thue pham cao cdn lai rit it va dilu nay phan anh thue trang
la ngudn lgi dang khai thac qua miic. Ngudn lgi ddng vat day ldn ciing da bj khai thac can
kiet, ngoai trir cau gai den.
- Cac phan tich va so sanh cho thay cac ran san hd trong vimg bien nay cd xu hudng
suy giam chat lugng va suy thoai theo thdi gian. TIC do suy thoai ciia ran san hd hang nam la
0,99%, trong dd khu virc ven bd Ninh Hai-Ninh Thuan, vjnh Nha Trang va Cii Lao Cham cd
tie do suy thoai ldn nhit (1,20-1,26%/nam) va thip nhit d vjnh Van Phong va vjnh Ca Na (<
1 %/nam). Cd su gia tang mat do tdng sd va nhdm ea kich thudc nhd (1-10 cm va 11-20cm)
theo thdi gian d hau hit cac khu vuc, trong khi dd cac nhdm ea cd kich ldn (21-30cm va > 30
cm) cd gia trj thue pham bj suy giam hoac khdng thay ddi theo thdi gian. Phin ldn cac nhdm
chi thj ngudn lgi ddng vat day thudc nhdm than mim, giap xac va da gai quan trong diu thi
hien xu thi giam hoac khdng thay ddi dang kl theo thdi gian do mat do cdn lai qua thap,
ngoai tru su gia tang mat do ciia ciu gai den d khu vuc Cii Lao Cham giira nam 2004 va 2008.
- Kit qua du bao trong giai doan 5 nam sip din tir 2010-2015 cho thiy cac ran san hd
tai khu vuc trong diem trong viing ven bd tir Da Ning din Binh Thuan van tilp tuc bj suy
thoai dang ke vdi tdc do dao ddng trong khoang 0,02-6,35%, trong do cao nhat la tai Cii Lao
Cham (6,35%) va vjnh Van Phong (3,50%). Tie do phuc hdi d mot sd khu vuc ran trong vimg
bien nay giai doan 2010-2015 dugc du bao dao ddng trong khoang 0,0-7,89%, trong dd cac
khu vuc cd kha nang phuc hdi cao rihit la Cii Lao Cham (7,89%), Ninh Hai-Ninh Thuan
(5,41%) va vjnh Nha Trang (1,17%), trong khi dd khu vuc vjnh Van Phong va vjnh Ca Na cd
tic do phuc hdi khdng dang kl (0,0-0,12%).

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Hgi nghi Khoa hgc ky' niem 35 ndm Vien Khoa hgc vd Cong nghe Viet Nam - Hd Ngi 10/2010

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