Soil heterotrophic respiration and its temperature sensitivity in different-aged orange plantations in Three Gorges Reservoir area of China

doi:10.3773/j.issn.1005-264x.2010.11.003

Abstract

Abstract:

Aims Orange (Citrus reticulate) plantations, as the primary industry of the Three Gorges Reservoir area of China, play a significant regulatory role in the maintenance of ecological balance in the region. Our objectives were to examine the main factors controlling soil heterotrophic respiration and its temperature sensitivity in three different-aged orange plantations and discuss their potential responses to future climate change in this region.
Methods A laboratory simulation was conducted with soil samples collected at 0-10 cm depth from three different-aged orange plantations in Yichang. Samples were incubated in the laboratory at 5, 15, 25, and 35 °C, respectively, and the alkali absorption method was applied to measure soil respiration. Soil physical and chemical properties were also measured.
Important findings With increasing age of the plantation, soil organic content and total nitrogen content increased, while soil pH and microbial biomass carbon decreased. The younger orange plantations released less CO₂ from soil heterotrophic respiration under all temperature conditions. Compared with other studies, temperature sensitivity coefficients of soil heterotrophic respiration (Q₁₀) in the orange plantations in this region were relatively low (1.45-1.69). All Q₁₀value changed with culture time. The temperature sensitivity coefficient of soil heterotrophic respiration of the plantations decreased with planting years, indicating that younger orange plantations will be more sensitive to future global warming than the older ones.

Key words: laboratory simulation, orange plantation, planting years, Q₁₀ value, soil microbial biomass carbon

ZHANG Wen-Li, LIU Ju, WANG Jian-Zhu, CHEN Fang-Qing. Soil heterotrophic respiration and its temperature sensitivity in different-aged orange plantations in Three Gorges Reservoir area of China[J]. Chin J Plant Ecol, 2010, 34(11): 1265-1273.

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https://www.plant-ecology.com/EN/Y2010/V34/I11/1265

Figures/Tables 6

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样地 Site	林龄 Stand age (a)	海拔 Elevation (m)	树高 Tree height (cm)	胸径 DBH (cm)	干周 Girth (cm)	树距 Tree distance (cm)	林下主要物种 Main species under forest
70s	34	76	317.8 ± 3.2^a	14.6 ± 0.5^a	45.9 ± 1.5^a	343.8 ± 16.6^b	绿青苔(Haplocladium capillatum)、垂盆草(Sedum spectabilis)、马唐(Digitaria cruciata)
80s	25	73	301.3 ± 4.6^b	14.6 ± 0.5^a	45.8 ± 1.7^a	411.5 ± 82.2^a	绿青苔(Haplocladium capillatum)、酢浆草(Oxalis corniculata)、野艾蒿(Artemisia leucophylla)
90s	16	116	288.1 ± 2.6^c	12.5 ± 0.4^b	39.3 ± 1.3^b	325.5 ± 35.2^b	绿青苔(Haplocladium capillatum)、茜草(Rubia cordifolia)、马唐(Digitaria cruciata)

样地 Site	林龄 Stand age (a)	海拔 Elevation (m)	树高 Tree height (cm)	胸径 DBH (cm)	干周 Girth (cm)	树距 Tree distance (cm)	林下主要物种 Main species under forest
70s	34	76	317.8 ± 3.2^a	14.6 ± 0.5^a	45.9 ± 1.5^a	343.8 ± 16.6^b	绿青苔(Haplocladium capillatum)、垂盆草(Sedum spectabilis)、马唐(Digitaria cruciata)
80s	25	73	301.3 ± 4.6^b	14.6 ± 0.5^a	45.8 ± 1.7^a	411.5 ± 82.2^a	绿青苔(Haplocladium capillatum)、酢浆草(Oxalis corniculata)、野艾蒿(Artemisia leucophylla)
90s	16	116	288.1 ± 2.6^c	12.5 ± 0.4^b	39.3 ± 1.3^b	325.5 ± 35.2^b	绿青苔(Haplocladium capillatum)、茜草(Rubia cordifolia)、马唐(Digitaria cruciata)

样地 Site	土壤含水量 Soil water content (%)	pH	土壤有机碳 Soil organic carbon (g·kg^-1)	全N Total nitrogen (g·kg^-1)	土壤微生物生物量碳 Soil microbial biomass carbon (mg·kg^-1)
70s	12.8 ± 1.05^b	5.6 ± 0.05^c	19.6 ± 0.90^a	1.0 ± 0.05^b	163.0 ± 39.76
80s	11.8 ± 0.56^b	6.3 ± 0.14^b	21.0 ± 0.25^a	1.2 ± 0.01^a	166.3 ± 34.65
90s	17.1 ± 1.68^a	7.4 ± 0.15^a	11.7 ± 0.40^b	0.7 ± 0.02^c	266.2 ± 60.21

样地 Site	土壤含水量 Soil water content (%)	pH	土壤有机碳 Soil organic carbon (g·kg^-1)	全N Total nitrogen (g·kg^-1)	土壤微生物生物量碳 Soil microbial biomass carbon (mg·kg^-1)
70s	12.8 ± 1.05^b	5.6 ± 0.05^c	19.6 ± 0.90^a	1.0 ± 0.05^b	163.0 ± 39.76
80s	11.8 ± 0.56^b	6.3 ± 0.14^b	21.0 ± 0.25^a	1.2 ± 0.01^a	166.3 ± 34.65
90s	17.1 ± 1.68^a	7.4 ± 0.15^a	11.7 ± 0.40^b	0.7 ± 0.02^c	266.2 ± 60.21

培养周期 Culture period	70s			80s			90s
培养周期 Culture period	Q₁₀	R₀	R²	Q₁₀	R₀	R²	Q₁₀	R₀	R²
1	1.67 ± 0.10	0.177 ± 0.023	0.67	1.42 ± 0.07	0.289 ± 0.034	0.55	1.45 ± 0.09	0.203 ± 0.028	0.56
2	1.73 ± 0.10	0.121 ± 0.017	0.69	1.79 ± 0.12	0.132 ± 0.020	0.68	2.01 ± 0.18	0.079 ± 0.017	0.65
3	1.36 ± 0.04	0.131 ± 0.009	0.73	1.48 ± 0.06	0.117 ± 0.012	0.68	1.38 ± 0.05	0.108 ± 0.011	0.62
4	1.54 ± 0.10	0.076 ± 0.012	0.53	1.46 ± 0.07	0.118 ± 0.012	0.64	1.86 ± 0.11	0.038 ± 0.006	0.75
5	1.32 ± 0.08	0.089 ± 0.012	0.36	1.27 ± 0.08	0.137 ± 0.020	0.23	1.57 ± 0.12	0.042 ± 0.008	0.48