[1]LI Bingyin,BU Chongfeng,LI Yiping,et al.Diurnal Dynamic Characteristics and Influencing Factors of the Carbon Flux in Biocrusted Soil in Mu Us Sandland[J].Research of Soil and Water Conservation,2018,25(04):174-180.
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Diurnal Dynamic Characteristics and Influencing Factors of the Carbon Flux in Biocrusted Soil in Mu Us Sandland
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 04
Page number:
174-180
Column:
Public date:
2018-06-13
- Title:
- Diurnal Dynamic Characteristics and Influencing Factors of the Carbon Flux in Biocrusted Soil in Mu Us Sandland
- Keywords:
- Mu Us Sandland; biocrust; carbon flux; environmental factors
- CLC:
- X171.1;S154.1
- DOI:
- -
- Abstract:
- Biocrust, a community of cyanobacteria, lichens, and mosses that live on the soil surface, is a critical part of land cover types in most arid and semi-arid regions. It can play a significant role in carbon fluxes and exchange in desert ecosystems through their own photosynthesis and respiration. In the present study, we used two dominant biocrust types (moss and algae) found in the Mu Us Sandland. The diurnal dynamic of soil carbon flux under the effects of biocrusts at different succession stages was measured by using a modified LI-8100 automated CO2 flux system, and the effects of environmental factors on photosynthesis and respiration of biocrust were analyzed. The main results include: (1) the biocrust with physiological activity can significantly reduce CO2 flux of soil and both the photosynthetic rate (Pn) and respiration rate (DR) of moss crust were significantly higher (p<0.01) than those of the algae crust; (2) the diurnal variation of photosynthetic rate of biocrust was a typical bimodal curve, with the peaks appearing at 9:00 and 16：00; and the diurnal variation of soil respiration rate followed a single-peak curve, with the peaks appearing at 12:00; (3) the correlation analysis result indicated that the soil water content in the depth of 2 cm and air humidity had the most significant effect on the photosynthetic rate of the biocrust; the soil temperature and water content in the depth of 2 cm had the most significant effect on the respiration rate.
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1900-01-01