Environmental Engineering Reference
In-Depth Information
Chapter 3
F
LUXES OF
CO
2
AND
CH
4
UNDER
D
IFFERENT
T
YPES
OF
C
OASTAL
S
ALT
M
ARSHES OF THE
Y
ELLOW
R
IVER
D
ELTA
:
D
YNAMIC
C
HANGES AND
D
RIVING
F
ACTORS ACROSS
D
IFFERENT
S
EASONS
Luping Song
1,3
, Lihua Zhang
1
, Hong-Bo Shao
1,2,
,
Liwen Zhang
1
and Bingchen Wang
2
1
Key Laboratory of Coastal Biology & Bioresources Utilization, Yantai Institute of
Coastal Zone Research (YIC), Chinese Academy of Sciences(CAS), Yantai, China
2
Institute for Life Science, Qingdao University of Science & Technology,
Qingdao, China
3
University of Chinese Academy of Sciences, Beijing, China
A
BSTRACT
Coastal salt marsh is one of the important composition of coastal land type.
However, our knowledge about greenhouse gas (GHG) turnover between the atmosphere
and the saline soils is very limited. In order to evaluate the potential of CO
2
and CH
4
consumption in salt marsh, the characteristics of methane (CH
4
) and carbon dioxide
(CO
2
) fluxes and the environmental factors from the coastal salt marsh in the Yellow
River Delta across four vegetation types (bare flat,
Suaeda glauca
,
Phragmites australis
and
Tamarix chinensis
) were observed in situ with static-chamber and GC methods from
April to December in 2012, and the seasonal variation and the key factors affecting CH
4
and CO
2
fluxes were discussed. We found that these coastal salt marshes were the source
of CO
2
all the years round, specifically, the CO
2
emissions varied from 2.287 mg/(m
2
·h)to
331.371 mg/(m
2
·h), and the mean CO
2
flux was 77.107 mg/(m
2
·h), which indicated that
the coastal salt marsh was the source of CO
2
all the years round. The order of CO
2
fluxes
of different vegetation types was bare flat<
S. glauca
<
P. australis
<
T. chinensis.
Correspondence address: Professor HB SHAO, Institute for Life Sciences, Qingdao University of Science &
Technology (QUST), Qingdao 266042, China; Tel: +86-535-2109191; E-mail: shaohongbochu@126.com
