EFFECTS OF SOIL TEMPERATURE AND MOISTURE ON SOIL SURFACE CO<sub>2</sub> FLUX OF FORESTS IN NORTHEASTERN CHINA

doi:10.17521/cjpe.2006.0038

Abstract

Abstract:

Forest ecosystems in northeastern China play an important role in both local and national carbon budgets because of their large area extent and huge amount of carbon storage. The spatial and temporal changes in soil surface CO₂ flux (R_S), the major CO₂ source to the atmosphere from terrestrial ecosystems, directly influence the local and regional carbon budgets. However, few data on R_S were available for this region. In this study, we used an infrared gas exchange analyzer (LI_COR 6400) to measure the R_S and related biophysical factors, and examined soil temperature and moisture effects on soil respiration for six secondary temperate forest ecosystem types: Mongolian oak (dominated by Quercus mongolica), poplar_birch (dominated by Populus davidiana and Betula platyphylla), mixed_wood (no dominant tree species), hard_wood forests (dominated by Fraxinus mandshurica, Juglans mandshurica and Phellodendron amurense), Korean pine (Pinus koraiensis) and Dahurian larch (Larix gmelinii) plantations. Our specific objectives were to: 1) compare the soil temperature, soil moisture, R_S, and Q₁₀ (temperature coefficient) of the six forest types; 2) quantify the seasonality of R_S and related environmental factors; and 3) determine the environmental factors affecting the R_S, and construct models of R_S against the related environmental factors.

Soil temperature, soil moisture and their interactions significantly (p < 0.01) influenced the R_S, but their effects depended on forest type and soil depth. These factors could explain 67.5%-90.6% of the variations in the R_S data. During the growing season, the soil temperature at 10 cm depth in the different forest types did not differ significantly but soil moisture did. The R_S for the oak, pine, larch, hardwood, mixed_wood, and poplar_birch stands varied from 1.89-5.23, 1.09-4.66, 0.95-3.52, 1.13-5.97, 1.05-6.58, and 1.11-5.76 μmol CO ₂·m^-2·s^-1, respectively; the Q₁₀ values for those stands were 2.32, 2.76, 2.57, 2.94, 3.55 and 3.54, correspondingly. The seasonality of R_S was driven mainly by soil temperature and moisture, and was roughly consistent with that of soil temperature. The broad_leaved forests had a higher soil respiration rate than those of coniferous forests probably because of a more suitable soil thermal and moisture regimes and other biological factors.

The temperature sensitivity coefficient of soil respiration (Q₁₀) showed a convex_type curve along a soil moisture gradient. The Q₁₀ tended to increase when soil moisture increased from 30.19 to 40.7, and then declined probably because the extremely high soil moisture content in the hardwood forest may impede activities of soil microbes and plant roots, and thus decrease decomposition rates and soil CO₂ emission. Our study strongly recommended that estimation of soil surface CO₂ flux from forest ecosystems should consider the comprehensive effects of both soil temperature and moisture on soil respiration so as to reduce uncertainties of ecosystem carbon budget studies in this region.

Key words: Soil surface CO₂ flux, Soil respiration, Temperate forest, Soil temperature, Soil moisture, Q₁₀

YANG Jin_Yan, WANG Chuan_Kuan. EFFECTS OF SOIL TEMPERATURE AND MOISTURE ON SOIL SURFACE CO<sub>2</sub> FLUX OF FORESTS IN NORTHEASTERN CHINA[J]. Chin J Plant Ecol, 2006, 30(2): 286-294.

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https://www.plant-ecology.com/EN/Y2006/V30/I2/286

Figures/Tables 6

References 30

[1]	Boone RD, Nadelhoffer KJ, Canary JD, Kaye JP (1998). Roots exert a strong influence on the temperature sensitivity of soil respiration. Nature, 396,570-572.
[2]	Chen QS (陈全胜), Li LH (李凌浩), Han XG (韩兴国), Yan ZD (阎志丹), Wang YF (王艳芬), Yuan ZY (袁志友) (2003). Influence of temperature and soil moisture on soil respiration of degraded steppe community in the Xilin River Basin of Inner Mongolia. Acta Phytoeclogica Sinica (植物生态学报), 27,202-209. (in Chinese with English abstract)
[3]	Chen QS (陈全胜), Li LH (李凌浩), Han XG (韩兴国), Yan ZD (阎志丹), Wang YF (王艳芬), Zhang Y (张焱), Xiong XG (熊小刚), Chen SP (陈世苹), Zhang LX (张丽霞), Gao YZ (高英志), Tang F (唐芳), Yang J (杨晶), Dong YS (董云社) (2004). Temperature sensitivity of soil respiration in relation to soil moisture in 11 communities of typical temperate steppe in Inner Mongolia. Acta Ecologica Sinica (生态学报), 24,831-836. (in Chinese with English abstract)
[4]	Davidson EA, Belk E, Boone RD (1998). Soil water content and temperature as independent or confounded factors controlling soil respiration in a temperate mixed hardwood forest. Global Change Biology, 4,217-227.
[5]	Fang C, Moncrief JB, Gholz HL, Clark KL (1998). Soil CO ₂ efflux and its spatial variation in a Florida slash pine plantation . Plant and Soil, 205,135-146.
[6]	Goulden ML, Munger JW, Fan SM, Daube BC, Wofsy SC (1996). Measurement of carbon sequestration by long_term eddy covariance, methods and a critical evaluation of accuracy. Global Change Biology, 2,169-182.
[7]	Kang SY, Doh SY, Lee DS, Lee DW, Jin VL, Kimball JS (2003). Topographic and climatic controls on soil respiration in six temperate mixed_hardwood forest slopes, Korea. Global Change Biology, 9,1427-1437.
[8]	Keith H, Jacobsen KL, Raison RJ (1997). Effects of soil phosphorus availability, temperature and moisture on soil respiration in Eucalyptus pauciflora forest . Plant and Soil, 190,127-141.
[9]	Landsberg JJ, Gower ST (1997). Applications of Physiological Ecology to Forest Management . Academic, San Diego, California, 354.
[10]	Liu JJ (刘建军), Wang DX (王得祥), Lei RD (雷瑞德), Wu XQ (吴钦孝) (2003). Soil respiration and release of carbon dioxide from natural forest of Pinus tabulaeformis and Quercus aliena var. acuteserrata. Scientia Silvae Sinicae (林业科学), 39(2),8-13. (in Chinese with English abstract)
[11]	Luo YQ, Wan SQ, Hui DF, Wallace LL (2001). Acclimatization of soil respiration to warming in a tall grass prairie. Nature, 413,622-625.
[12]	Ohashi M, Gyokusen K, Saito A (1999). Measurement of carbon dioxide evolution from a Japanese cedar (Cryptomeria japonica) forest floor using an open_flow chamber method . Forest Ecology and Management, 123,105-114.
[13]	Post WM, Emanuel WR (1982). Soil carbon pools and world life zones. Nature, 298,156-159.
[14]	Pypker TG, Fredeen AL (2003). Below ground CO ₂ efflux from cut blocks of varying ages in sub_ boreal British Columbia . Forest Ecology and Management, 172,249-259.
[15]	Raich JW, Potter CS (1995). Global patterns of carbon dioxide emissions from soils. Global Biochemical Cycles, 9,23-36.
[16]	Raich JW, Tufekcioglu A (2000). Vegetation and soil respiration: correlation and controls. Biogeochemistry, 48,71-90.
[17]	Raich JW, Schlesinger WH (1992). The global carbon dioxide efflux in soil respiration and its relationship to vegetation and climate. Tellus, 44B,81-90.
[18]	Raich JW, Potter CS, Bhagawati D (2002). Interannual variability in global soil respiration, 1980-94. Global Change Biology, 8,800-812.
[19]	Rayment MB, Jarvis PG (2000). Temporal and spatial variation of soil CO ₂ efflux in a Canadian boreal forest . Soil Biology and Biochemistry, 32,35-45.
[20]	Russell CA, Voroney RP (1998). Carbon dioxide efflux from the floor of a boreal aspen forest I. relationship to environmental variables and estimates of C respired. Canadian Journal of Soil Science, 78,301-310.
[21]	Savin MC, Gorres JH, Neher DA (2001). Biogeophysical factors influencing soil respiration and mineral nitrogen content in an old field soil. Soil Biology and Biogeochemistry, 33,429-438.
[22]	Scott_Denton LE, Sparks KL, Monson RK (2003). Spatial and temporal controls of soil respiration rate in a high_elevation, subalpine forest. Soil Biology and Biochemistry, 35,525-534.
[23]	Tian H, Melillo JM, Kicklighter DW, McGuire AD, Helfrich J (1999). The sensitivity of terrestrial carbon storage to historical climate variability and atmospheric CO ₂ in the United States . Tellus, 51 B ,414-452.
[24]	Valentini R, Matteucci G, Dolman AJ, Schulze ED, Rebmann C, Moors EJ, Granier A, Gross P, Jensen NO, Pilegaard K, Lindroth A, Grelle A, Bernhofer C, Grünwald T, Aubinet M, Ceulemans R, Kowalski AS, Vesala T, Rannik Á, Berbigier P, Loustau D, Guemundsson J, Thorgeirsson H, Ibrom A, Morgenstern K, Clement R, Moncrieff J, Montagnani L, Minerbi S, Jarvis PG (2000). Respiration as the main determinant of carbon balance in European forests. Nature, 404,861-865. URL PMID
[25]	Wang CK, Bond_Lamberty B, Gower ST (2002). Soil surface CO ₂ flux in a boreal black spruce fire chronosequence . Journal of Geophysical Research_Atmospheres, 108,8224.
[26]	Wang M (王淼), Ji LZ (姬兰柱), Li QR (李秋荣), Liu YQ (刘延秋) (2003). Effects of soil temperature and moisture in different forest in Changbai Mountain. Chinese Journal of Applied Ecology (应用生态学报), 14,1234-1238. (in Chinese with English abstract)
[27]	Wang M (王淼), Han SJ (韩士杰), Wang YS (王跃思) (2004). Important factors controlling CO ₂ emission rates from forest soil . Chinese Journal of Ecology (生态学杂志), 23(5),24-29. (in Chinese with English abstract)
[28]	Xu M, Qi Y (2001a). Soil_surface CO ₂ efflux and its spatial andtemporal variations in a young ponderosa pine plantation in northern California . Global Change Biology, 7,667-677.
[29]	Xu M, Qi Y (2001b). Spatial and seasonal variations of Q ₁₀ determined by soil respiration measurements at a Sierra Nevadan forest . Global Biogeochemical Cycles, 15,687-696.
[30]	The Chinese Forestry Ministry (中华人民共和国林业部) (1996). Statistics of National Forest Resources in China (全国森林资源统计), China Forestry Publishing House, Beijing. (in Chinese)

生态系统类型 Forest ecosystem	坡度 Slope	坡向 Aspect	植被组成 Vegetation composition
生态系统类型 Forest ecosystem	坡度 Slope	坡向 Aspect	乔木(优势种) Overstory (Dominant species)	下木 Understory
蒙古栎林Quercus mongolica forest	23°	南South	(1)、2、3、4、5、6	7、8、9、10
杨桦林Populus davidiana_Betula platyphylla forest	16°	西南Southwest	(6)、(5)、11、4、3、2	7、8、9、12、10、13、14
硬阔叶林Hard_wood forest	7°	北North	4、3、2、11	7、9、13、15、16、17
杂木林Mixed forest	15°	西南Southwest	2、11、4、3、5、6	7、9、15、13、18、19
落叶松人工林Larix gmelinii plantation	2°	西南Southwest	(20)、3、21	15、22、16、10、9、7、23
红松人工林Pinus koraiensis plantation	12°	西北Northwest	(24)、6、3、25、5、11、6	9、19

生态系统类型 Forest ecosystem	坡度 Slope	坡向 Aspect	植被组成 Vegetation composition
生态系统类型 Forest ecosystem	坡度 Slope	坡向 Aspect	乔木(优势种) Overstory (Dominant species)	下木 Understory
蒙古栎林Quercus mongolica forest	23°	南South	(1)、2、3、4、5、6	7、8、9、10
杨桦林Populus davidiana_Betula platyphylla forest	16°	西南Southwest	(6)、(5)、11、4、3、2	7、8、9、12、10、13、14
硬阔叶林Hard_wood forest	7°	北North	4、3、2、11	7、9、13、15、16、17
杂木林Mixed forest	15°	西南Southwest	2、11、4、3、5、6	7、9、15、13、18、19
落叶松人工林Larix gmelinii plantation	2°	西南Southwest	(20)、3、21	15、22、16、10、9、7、23
红松人工林Pinus koraiensis plantation	12°	西北Northwest	(24)、6、3、25、5、11、6	9、19

生态系统类型 Forest ecosystem	土壤深度 Soil depth (cm)	回归方程 Regression model	决定系数 R²	显著水平 p
蒙古栎林 Quercus mongolica forest	10	ln(R_S)=-0.294 5+0.073 4×T₁₀+1.692 4×W₁₀	0.675	<0.001
	2	ln(R_S)=-0.740 1+0.104 5×T₂+1.804 5×W₂-0.067 0×T₂×W₂	0.704	<0.001
杨桦林Populus davidiana_ Betula platyphylla forest	10	ln(R_S)=-1.611+0.195 1×T₁₀+3.190 2×W₁₀-0.188 2×T₁₀×W₁₀	0.906	<0.001
	2	ln(R_S)=-1.068 6+0.147 2×T₂+1.239×W₂-0.063 6×T₂×W₂	0.855	<0.001
硬阔叶林 Hard_wood forest	10	ln(R_S)=-1.161 0+0.175 4×T₁₀+1.956 5×W₁₀-0.1277×T₁₀×W₁₀	0.771	<0.001
	2	ln(R_S)=-0.078 4+0.094 7×T₂	0.751	<0.001
杂木林 Mixed forest	10	ln(R_S)=-1.730 2+0.203 0×T₁₀+3.224 4×W₁₀-0.1737×T₁₀×W₁₀	0.902	<0.001
	2	ln(R_S)=-0.202 6+0.108 8×T₂	0.852	<0.001
红松人工林 Pinus koraiensis plantation	10	ln(R_S)=-1.538 6+0.155 6×T₁₀+3.199 0×W₁₀-0.1304×T₁₀×W₁₀	0.855	<0.001
	2	ln(R_S)=-0.740 1+0.096 0×T₂+0.822 9×W₂	0.780	<0.001
落叶松人工林 Larix gmelinii plantation	10	ln(R_S)=-0.831 9+0.099 1×T₁₀+0.926 0×W₁₀	0.846	<0.001
	2	ln(R_S)=-0.573 4+0.093 7×T₂	0.809	<0.001

生态系统类型 Forest ecosystem	土壤深度 Soil depth (cm)	回归方程 Regression model	决定系数 R²	显著水平 p
蒙古栎林 Quercus mongolica forest	10	ln(R_S)=-0.294 5+0.073 4×T₁₀+1.692 4×W₁₀	0.675	<0.001
	2	ln(R_S)=-0.740 1+0.104 5×T₂+1.804 5×W₂-0.067 0×T₂×W₂	0.704	<0.001
杨桦林Populus davidiana_ Betula platyphylla forest	10	ln(R_S)=-1.611+0.195 1×T₁₀+3.190 2×W₁₀-0.188 2×T₁₀×W₁₀	0.906	<0.001
	2	ln(R_S)=-1.068 6+0.147 2×T₂+1.239×W₂-0.063 6×T₂×W₂	0.855	<0.001
硬阔叶林 Hard_wood forest	10	ln(R_S)=-1.161 0+0.175 4×T₁₀+1.956 5×W₁₀-0.1277×T₁₀×W₁₀	0.771	<0.001
	2	ln(R_S)=-0.078 4+0.094 7×T₂	0.751	<0.001
杂木林 Mixed forest	10	ln(R_S)=-1.730 2+0.203 0×T₁₀+3.224 4×W₁₀-0.1737×T₁₀×W₁₀	0.902	<0.001
	2	ln(R_S)=-0.202 6+0.108 8×T₂	0.852	<0.001
红松人工林 Pinus koraiensis plantation	10	ln(R_S)=-1.538 6+0.155 6×T₁₀+3.199 0×W₁₀-0.1304×T₁₀×W₁₀	0.855	<0.001
	2	ln(R_S)=-0.740 1+0.096 0×T₂+0.822 9×W₂	0.780	<0.001
落叶松人工林 Larix gmelinii plantation	10	ln(R_S)=-0.831 9+0.099 1×T₁₀+0.926 0×W₁₀	0.846	<0.001
	2	ln(R_S)=-0.573 4+0.093 7×T₂	0.809	<0.001

生态系统类型 Forest ecosystems	土壤呼吸速率 R_S (μmol CO₂·m^-2·s^-1)		土壤温度 Soil temperature (℃)		土壤湿度 Soil moisture (%)
生态系统类型 Forest ecosystems	均值 Mean	标准差 SD	均值 Mean	标准差 SD	均值 Mean	标准差 SD
杂木林Mixed forest	3.94^A	1.86	12.95^A	4.24	40.70^B	4.83
蒙古栎林Quercus mongolica forest	3.79^ABC	1.07	13.81^A	3.95	30.19^F	7.05
杨桦林Populus davidiana- Betula platyphylla forest	3.70^B	1.65	13.08^A	4.40	37.44^D	5.18
硬阔叶林 Hard_wood forest	3.61^C	1.56	13.17^A	3.91	53.42^A	4.43
红松人工林 Pinus koraiensis plantation	3.05^D	1.16	12.06^A	4.28	38.60^C	6.91
落叶松人工林 Larix gmelinii plantation	2.35^E	0.85	11.14^A	4.55	32.02^E	6.67