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Soil respiration (Rs) and its biophysical controls were measuredover a fixed sand dune in a desert–shrub ecosystem in northwest China in 2012to explore the mechanisms controlling the spatial heterogeneity inRs and to understand the plant effects on the spatial variationin Rs in different phenophases. The measurements were carried outon four slope orientations (i.e., windward, leeward, north- and south-facing)and three height positions on each slope (i.e., lower, upper, and top) acrossthe phenophases of the dominant shrub species (Artemisia ordosica).Coefficient of variation (i.e., standard deviation/mean) of Rsacross the 11 microsites over our measurement period was 23.5 %. Soilrespiration was highest on the leeward slope, and lowest on the windwardslope. Over the measurement period, plant-related factors, rather thanmicrohydrometeorological factors, affected the microtopographic variationin Rs. During the flower-bearing phase, root biomass affectedRs most, explaining 72 % of the total variation. During theleaf coloration–defoliation phase, soil nitrogen content affectedRs the most, explaining 56 % of the total variation. Ourfindings highlight that spatial pattern in Rs was dependent onplant distribution over a desert sand dune, and plant-related factors largelyregulated topographic variation in Rs, and such regulationsvaried with plant phenology

Microtopographic variation in soil respiration and its controlling factors vary with plant phenophases in a desert–shrub ecosystem