准噶尔盆地南缘梭梭群落春季融雪期的土壤呼吸动态

Abstract

Abstract: Snowmelt affects highly the change of soil moisture content and temperature in topsoil in snow thawing season, and hence affects soil respiration in temperate arid land. In snow thawing season in early spring 2012, a carbon flux chamber was used to observe the dynamic change of soil respiration in Haloxylon ammodendron community in southern marginal zone of the Gurbantonggut Desert. The results showed that the variation of soil respiration rate was significant and ranged from 0.2 to 1.2 μmol•m^-2•s^-1. In snow thawing season, the mean soil respiration rate was increased at first and then decreased, and its maximum value was decreased with the decrease of soil moisture content. Soil respiration under bushwood was significantly higher than that out of the bushwood, and its variation under and out of the bushwood was similar. There was a significant correlation between soil moisture content and maximum soil respiration in snow thawing season, and also a significant correlation between soil temperature and soil respiration at daily scale. The study results revealed that there was a stimulating effect of snow thawing on soil respiration, and the change of snow cover in early spring affected significantly soil respiration in the Gurbantonggut Desert.

Key words: soil respiration, snowmelt season in spring, Haloxylon ammodendron community, soil moisture content, spring, Junggar Basin

XIE Ji-Ping, ZHONG Wen-Zhao, HUANG Gang, LI Yan, WU Lin-Feng. Dynamic Change of Soil Respiration in Haloxylon ammodendron Community in Southern Edge of Junggar Basin in Snowmelt Season[J]., 2013, 30(3): 430-437.

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Dynamic Change of Soil Respiration in Haloxylon ammodendron Community in Southern Edge of Junggar Basin in Snowmelt Season

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