Chinese Journal of Plant Ecology >
IMPACT OF TEMPERATURE AND SOIL WATER CONTENT ON SOIL RESPIRATION IN TEMPERATE DESERTS, CHINA
Received date: 2008-10-13
Revised date: 2008-10-13
Online published: 2009-09-30
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.
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]. Chinese Journal of Plant Ecology, 2009 , 33(5) : 936 -949 . DOI: 10.3773/j.issn.1005-264x.2009.05.013
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