Soil organic carbon mineralization response to litter addition in desert steppe grassland sites with differences in number of years grazing exclusion by fencing

doi:10.11686/cyxb2018680

Abstract

Abstract: This experiment aimed to explore the soil organic carbon mineralization response to litter addition in desert steppe grassland sites with differences in number of years grazing exclusion by fencing. The sites studied were grazed and never fenced (GG), fenced 5 years (FG₅), fenced 9 years (FG₉) and fenced 12 years (FG₁₂). The effects on soil organic carbon mineralization, of adding litter samples including material from Lespedeza potaninii (N+S), Agropyron mongolicum (M+S), Stipa breviflora (D+S) and mixed plants (H+S) to soil samples from the desert steppe grassland sites with different fencing durations were determined after a laboratory incubation period of 76 days. It was found that: 1) Litter addition significantly increased the soil organic carbon mineralization rate and the cumulative mineralization of the soil samples, irrespective of the fencing duration. For the GG and FG₉ samples, the cumulative mineralization was highest with H+S litter addition (13.81 and 15.80 mg·kg^-1, respectively). For the FG₅ and FG₁₂ sites, the greatest mineralization occurred with the addition M+S litter (15.04 and 13.47 mg·kg^-1, respectively). The mineralization process could be roughly divided into three stages: 0-6 d for rapid release (activate carbon pool), 7-62 d for slow release (long-term carbon pool) and 63-76 d for stable C release (inert carbon pool). 2) The first-order kinetic equation was well matched to the mineralization dynamics of soil organic carbon (R²=0.815-0.932), and the potential mineralization of soil was highest in FG₅ grassland (8.834±0.382 mg·kg^-1). 3) Litter addition had a positive priming effect on soil organic carbon mineralization in grasslands of different fencing durations, with the priming effect being strongest in soil from the FG₉ site. Representational difference analysis (RDA) sequencing showed that the organic carbon and total nitrogen of litter had significant effects on soil organic carbon mineralization (F=15.314, P=0.002; F=8.669, P=0.008, respectively, with cumulative R² of 70.87%).

Key words: desert steppe, fenced, litter, organic carbon mineralization, priming effect

LIU Jin-long, WANG Guo-hui, XU Dong-mei, XU Ai-yun, YU Shuang. Soil organic carbon mineralization response to litter addition in desert steppe grassland sites with differences in number of years grazing exclusion by fencing[J]. Acta Prataculturae Sinica, 2019, 28(4): 47-57.

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