DOI: 10.3724/SP.J.1226.2013.00722

Sciences in Cold and Arid Regions 2013/5:6 PP.722-732

Effect of rain enrichment on soil respiration of Nitraria sphaerocarpa community in a hyperarid area

In order to analyze the effect of rain enrichment on soil respiration rate of a Nitraria sphaerocarpa community,we measured soil respiration rate in bare and vegetated areas in a hyperarid area(Dunhuang)during the growing season.Results show that rain enrichment can increase bare and vegetated soil respiration rates.The more rainfall enrichment,the greater the increment and the longer duration time effect for soil respiration rate.200%(16 mm)and 300%(24 mm)of rain enrichment can significantly increase bare soil respiration rates by 90%and 106%(P<0.01),respectively.By contrast,areas with 100%(8 mm),200%(16 mm)and 300%(24 mm)of rain enrichment can significantly increase shrub area respiration rates by 68%,157%and 205%(P<0.01),respectively.The response time of bare and vegetated soil respiration to rainfall enrichment is asynchronous.Response variable of soil respiration in vegetated soil is higher(118%)than in bare soil.There was significant positive correlation between soil respiration rate and soil water content during the growing season(P<0.01).For every 1 mm increment of precipitation,soil respiration rate increased by 0.01 and 0.04μmol/(m2·s),respectively in vegetated and bare soils.

Key words:soil respiration,rain enrichment,Nitraria sphaerocarpa,soil water content

ReleaseDate:2015-04-17 09:59:13

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