IMPACT OF TEMPERATURE AND SOIL WATER CONTENT ON SOIL RESPIRATION IN TEMPERATE DESERTS, CHINA

doi:10.3773/j.issn.1005-264x.2009.05.013

Abstract

Abstract:

Aims Our objective was to determine the impact of temperature and soil water content on soil respiration in Haloxylon ammodendron, Anabasis aphylla and Halostachys caspica desert communities.
Methods We measured soil respiration in the 2005 and 2006 growing seasons using an automated CO₂ efflux system (Li-Cor 8100). Air temperature (at 50 cm in height) and soil temperature (every 5 cm from 0 to 50 cm depth) were monitored at three points adjacent to the chamber using a digital thermometer at each site. Gravimetric soil moisture at 0-5, 5-15, 15-30, and 30-50 cm depths at three points was measured using the oven-drying method at 105 °C for 48 h. Water was added for artificial precipitation using plastic watering cans.
Important findings Soil respiration showed an asymmetric daytime pattern, with the minimum at 8:00 and the maximum at 12:00-14:00. The seasonal variation of soil respiration was characterized by a minimum in October and a maximum in June or July, which generally followed that of air temperature. The mean soil respiration rate in the growing season was 0.76, 0.52 and 0.46 μmol CO₂·m^-2·s^-1 in Haloxylon ammodendron, Anabasis aphylla and Halostachys caspica communities, respectively. Air temperature explained >35%, 51% and 65% of seasonal variations of soil respiration in Haloxylon ammodendron, Anabasis aphylla and Halostachys caspica communities, respectively. Q₁₀ values increased in Haloxylon ammodendron (1.35), Anabasis aphylla (1.41) and Halostachys caspica (1.52) communities, and R₁₀ decreased 0.45, 0.30 and 0.22 μmol CO₂·m^-2·s^-1 in each site, respectively. Significant power and quadratic relationships existed between normalized soil respiration and soil water content in the Haloxylon ammodendron and Anabasis aphylla communities, but not in the Halostachys caspica community. Two-dimensional equations based on temperature and soil water content explained most of temporal variations of soil respiration: 71%-93% in Haloxylon ammodendron, 79%-82% in Anabasis aphylla and 70%-80% in Halostachys caspica. Following artificial precipitation, the rate of soil respiration decreased, increased and then quickly decreased again, a pattern consistent with changes in soil temperature.

Key words: soil respiration, temperature, soil water content, artificial precipitation, desert, arid region

ZHANG Li-Hua, CHEN Ya-Ning, ZHAO Rui-Feng, LI Wei-Hong. IMPACT OF TEMPERATURE AND SOIL WATER CONTENT ON SOIL RESPIRATION IN TEMPERATE DESERTS, CHINA[J]. Chin J Plant Ecol, 2009, 33(5): 936-949.

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Figures/Tables 10

References 43

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群落 Community	有机碳 Organic carbon (g·kg^-1)	有机质 Organic matter (g·kg^-1)	全氮 Total N (g·kg^-1)	全磷 Total P (g·kg^-1)	全钾 Total K (g·kg^-1)	速效氮Available N (mg·kg^-1)	速效磷 Available P (mg·kg^-1)	速效钾 Available K (mg·kg^-1)	pH 1:5	电导率 Electric conductivity (ms·cm^-1)	全盐 Total salinity (g·kg^-1)
梭梭 Haloxylon ammodendron	3.153	5.436	0.278	0.687	19.166	11.385	3.670	241.000	9.090	0.616	2.157
假木贼 Anabasis aphylla	3.037	5.236	0.290	0.663	19.218	11.183	2.039	132.900	8.341	0.784	3.295
盐穗木 Halostachys caspica	3.361	5.795	0.326	0.758	20.692	9.869	5.901	129.100	8.125	1.923	6.788

群落 Community	有机碳 Organic carbon (g·kg^-1)	有机质 Organic matter (g·kg^-1)	全氮 Total N (g·kg^-1)	全磷 Total P (g·kg^-1)	全钾 Total K (g·kg^-1)	速效氮Available N (mg·kg^-1)	速效磷 Available P (mg·kg^-1)	速效钾 Available K (mg·kg^-1)	pH 1:5	电导率 Electric conductivity (ms·cm^-1)	全盐 Total salinity (g·kg^-1)
梭梭 Haloxylon ammodendron	3.153	5.436	0.278	0.687	19.166	11.385	3.670	241.000	9.090	0.616	2.157
假木贼 Anabasis aphylla	3.037	5.236	0.290	0.663	19.218	11.183	2.039	132.900	8.341	0.784	3.295
盐穗木 Halostachys caspica	3.361	5.795	0.326	0.758	20.692	9.869	5.901	129.100	8.125	1.923	6.788

群落 Community	样本数 n	Rs-Ws (实测土壤呼吸 For all measured efflux)	R²	p	Rs₁₀-Ws (标准化到10℃的土壤呼吸 For efflux at 10 °C)	R²	p
梭梭 Haloxylon ammodendron	12	Rs=0.528+0.04Ws	0.08	0.373	Rs=0.175+0.05Ws	0.50	0.010
	12	Rs=0.439Ws^0.276	0.07	0.412	Rs=0.154Ws^0.624	0.55	0.006
	12	Rs=0.185+0.16Ws-0.009Ws²	0.09	0.642	Rs=0.022+0.104Ws-0.004Ws²	0.51	0.040
假木贼 Anabasis aphylla	12	Rs=0.416+0.011Ws	0.11	0.300	Rs=0.197+0.011Ws	0.57	0.004
	12	Rs=0.302Ws^0.227	0.11	0.291	Rs=0.141Ws^0.341	0.51	0.010
	12	Rs=0.126+0.077Ws-0.003Ws²	0.24	0.294	Rs=0.165+0.018Ws-0.0003Ws²	0.58	0.020
盐穗木 Halostachys caspica	12	Rs=0.415+0.004Ws	0.02	0.680	Rs=0.184+0.003Ws	0.15	0.206
	12	Rs=0.292Ws^0.165	0.05	0.507	Rs=0.122Ws^0.246	0.28	0.075
	12	Rs=-0.182+0.11Ws-0.004Ws²	0.63	0.012	Rs=0.045+0.028Ws-0.001Ws²	0.48	0.053
综合 Total	36	Rs=0.62-0.005Ws	0.01	0.576	Rs=0.349-0.001Ws	0.002	0.764
	36	Rs=0.579Ws^-0.045	0.003	0.744	Rs=0.318Ws^-0.012	0.000 3	0.922
	36	Rs=0.419+0.04Ws-0.002Ws²	0.05	0.400	Rs=0.25+0.021Ws-0.001Ws²	0.04	0.538

群落 Community	样本数 n	Rs-Ws (实测土壤呼吸 For all measured efflux)	R²	p	Rs₁₀-Ws (标准化到10℃的土壤呼吸 For efflux at 10 °C)	R²	p
梭梭 Haloxylon ammodendron	12	Rs=0.528+0.04Ws	0.08	0.373	Rs=0.175+0.05Ws	0.50	0.010
	12	Rs=0.439Ws^0.276	0.07	0.412	Rs=0.154Ws^0.624	0.55	0.006
	12	Rs=0.185+0.16Ws-0.009Ws²	0.09	0.642	Rs=0.022+0.104Ws-0.004Ws²	0.51	0.040
假木贼 Anabasis aphylla	12	Rs=0.416+0.011Ws	0.11	0.300	Rs=0.197+0.011Ws	0.57	0.004
	12	Rs=0.302Ws^0.227	0.11	0.291	Rs=0.141Ws^0.341	0.51	0.010
	12	Rs=0.126+0.077Ws-0.003Ws²	0.24	0.294	Rs=0.165+0.018Ws-0.0003Ws²	0.58	0.020
盐穗木 Halostachys caspica	12	Rs=0.415+0.004Ws	0.02	0.680	Rs=0.184+0.003Ws	0.15	0.206
	12	Rs=0.292Ws^0.165	0.05	0.507	Rs=0.122Ws^0.246	0.28	0.075
	12	Rs=-0.182+0.11Ws-0.004Ws²	0.63	0.012	Rs=0.045+0.028Ws-0.001Ws²	0.48	0.053
综合 Total	36	Rs=0.62-0.005Ws	0.01	0.576	Rs=0.349-0.001Ws	0.002	0.764
	36	Rs=0.579Ws^-0.045	0.003	0.744	Rs=0.318Ws^-0.012	0.000 3	0.922
	36	Rs=0.419+0.04Ws-0.002Ws²	0.05	0.400	Rs=0.25+0.021Ws-0.001Ws²	0.04	0.538