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CAS Workshop on Ecosystem Succession Theory and Practice of Ecological Restoration Modeling the relationship between soil CO2
emission and environmental factors in lower subtropical China
Li
Yuelin Peng Shaolin (South
China Institute of Botany, Chinese Academy of Sciences, Guangzhou
510650, PR China.) Abstract:
Soil respiration is the primary path by which CO2 fixed
by land plants returns to the atmosphere, and a key process in
relation to the global change. The objective of this paper is to
provide a brief scientific assessment on the effects of soil
respiration, then find the relationship between land use and soil
carbon sequestration, especially the influence of vegetation
rehabitation. This study was conducted at the Heshan
Interdisciplinary Experimental Station (112˚54’ E,
22˚41’ N), Chinese Academy of Sciences in Guangdong province,
P R. China. The experimental area is typical of the region with low
hills (peak elevation of 98 m) and small catchments (each having an
area of about 5–8 ha). Trend surface analysis was used to quantify
the soil CO2 emission, A model which included
multivariate of environmental factors was constructed as follow: X=0.05194X1+0.06588X2+0.03668X3+0.02910X4-0.00723X5-0.00260X6+0.03640X7-2.39649 Y=-0.02692X1+0.04777X2+0.07208X3-0.01516X4+0.03760X5-0.00892X6-0.03561X7+
5.956623 Z1=
589.950261X -361.233304 Y + 60.661379 X2- 536.311504 X×Y-115.118974
Y2 +2075.431054 Z2
= 670.690726X- 276.622127 Y + 114.687170 X2-744.721084 X×Y-744.721084Y2
+2323.099949 where: X and Y are public factors; both of which are synthesis of all
the environmental factors. X1 is air temperature(℃)，X2 is wet-bulb temperature(℃)，X3 is absolute humidity(%)，X4
is dry-bulb saturated vapor press(hpa)，X5 is
relative humidity(%)，X6 atmosphere
pressure (hpa)，X7 is
ground temperature(℃). Z1 is the flux of soil CO2 emission at soil
surface (mg•m-2•h-1), while Z2
is the flux of soil CO2 emission at 5cm deep in the soil
(mg•m-2•h-1). Key
words: Forest soil CO2 emission; Trend surface analysis;
Subtropical forest soil of South China
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