SOIL SYSTEM RESPIRATION AND ITS CONTROLLING FACTORS IN CUNNINGHAMIA LANCEOLATA AND PINUS MASSONIANA COMMUNITIES OF SUBTROPICAL CHINA

doi:10.3773/j.issn.1005-264x.2009.01.006

Abstract

Abstract:

Aims Cunninghamia lanceolata and Pinus massoniana forest ecosystems in subtropical China are important in national carbon budgets because of their large area and amount of carbon storage. Soil respiration is the second largest flux in the global carbon cycle, but the effect of these forest ecosystems on soil respiration is inadequately understood. Our objectives were to compare soil respiration rate, soil temperature, soil moisture and Q₁₀value of the two communities and to evaluate relationships between soil respiration rates and environment factors.
Methods We examined seasonal variations of soil respiration using an infrared gas exchange analyzer (Li-Cor 6400-09) from January to December 2007 in Tianjiling National Forestry Park, Changsha. Soil temperature and moisture were measured at the same time at 5 cm depth. At the middle of January, April, July and October, we examined whole samples of root biomasses at 60 cm depth. We evaluated Q₁₀ values of soil respiration and correlations between soil respiration and environment factors.
Important findings The two communities had significantly different patterns in seasonal soil respiration processes. The two forests exhibited irregularly fluctuating curves during the study period with mean rates of soil respiration of 186.9 and 242.4 mg CO₂·m^-2·h^-1 in C. lanceolata and P. massoniana stands, respectively. Significant relationships were found between soil respiration rate and soil temperature in both communities and are best described by exponential equations. However, no significant relationships were found between soil respiration and soil moisture. Soil temperature and moisture could explain changes in soil respiration of 91.7% and 78.0% in the C. lanceolata community and 5.4% and 8.4%, in the P. massoniana community. The relationship between soil respiration rate (y) and soil temperature (t) is described by the regression equation: y=34.09e ^{0.081 5}^t (R²=0.917, p<0.001), y=48.68e ^{0.075 4}^t (R²=0.780 3, p<0.001). R ²=0.917, p<0.001. The Q₁₀ values in C. lanceolata and P. massoniana forests were 2.26 and 2.13, respectively, and tended to decrease when soil temperature increased from lower to higher scales. Seasonal patterns of soil respiration in these two forests were not only determined by soil temperature and soil moisture, but also by fine root mass and litter production.

Key words: subtropical forest, soil respiration, soil temperature, soil moisture, Q₁₀value, Cunninghamia lanceolata, Pinus massoniana

WANG Guang-Jun, TIAN Da-Lun, YANG Wen-De, ZHU Fan, LI Shu-Zhan. SOIL SYSTEM RESPIRATION AND ITS CONTROLLING FACTORS IN CUNNINGHAMIA LANCEOLATA AND PINUS MASSONIANA COMMUNITIES OF SUBTROPICAL CHINA[J]. Chin J Plant Ecol, 2009, 33(1): 53-62.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.01.006

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Figures/Tables 6

Table 1 Base instances of 2 types forest communities

森林类型 Forest types	年龄 Year (a)	每公顷株数 No. of per hm²	胸径 Chest diameter (cm)	树高 Height of tree (m)	枝下高 Height of branch (m)	郁闭度 Crown density
杉木 Cunninghamia lanceolata	18	1 102	16.26	12.47	5.26	0.8
马尾松 Pinus massoniana	33	690	18.65	13.57	7.83	0.6

Table 2 Soil physical chemical properties, biomass of roots and litter production in 2 plots over 0-60 cm soil depth

森林类型 Forest type	全C Total C (mg C·g^-1)	全N Total N (mg N·g^-1)	碳/氮 C/N	pH	土壤密度 Soil density (g·cm^-1)	细根 Fine root mass (g·m^-2)	粗根 Coarse root mass (g·m^-2)	凋落物 Litter production (g·m^-2·a^-1)
杉木 Cunninghamia lanceolata	7.81(0.24)	0.89(0.5)	11.83	3.55	1.52(0.02)	456.01(53.69)	1 163. 81(62.92)	575.1((51.5)
马尾松 Pinus massoniana	8.38(0.03)	0.67(0.06)	12.76	3.70	1.58(0.08)	566. 32(81.20)	1 565.01(190.11)	1 157.5(145.1)

Fig. 1 Seasonal variations of soil respiration, soil moistures at 5 cm soil depth, and daily precipitation of Cunninghamia lanceolata and Pinus massoniana communities and Huitong ecological station for Chinese fir plantations during 2007

Fig. 2 Seasonal dynamics of soil respiration rate, temperature and moisture in Cunninghamia lanceolata and Pinus massoniana communities during 2007

Fig. 3 Relationships between soil respiration rates and soil temperatures in 5 cm soil depth in Cunninghamia lanceolata and Pinus massoniana communities

Fig. 4 Relationships between soil respiration rates and soil moisture in 5 cm soil depth in Cunninghamia lanceolata and Pinus massoniana communities

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