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| Carbon sequestration of Caragana korshinskii shrubs surface soil in different desertified grassland of desert steppe |
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| DOI：10.16768/j.issn.1004-874X.2016.07.010 |
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| Abstract: |
| To understand the soil organic carbon evolution under the long-term effects of Caragana korshinskii
in desert steppe，taking 6 kinds of grassland with different desertification gradient: natural grassland（T1）， sierozem
grassland（T2），crusts grassland（T3），fixed sand dune grassland（ T4），semi-fixed sand dune grassland（ T5），mobile sand dune grassland（ T6） as research objects，to analyze the soil carbon sequestration in internal and external
of shrubs with large，medium and small crown. The results showed that：（1）In internal and external of C. korshinskii
shrubs，the lowest TOC contents was in the mobile sand dune grassland（ P<0.01），the highest was in the natural
grassland（ P<0.01）. The highest AOC content was in the crusts grassland with internal of shrubs（ P<0.01），the
existence of internal of shrubs played an important role in AOC sequestration.（ 2）The large，medium and small
crown of C. korshinskii were compared，the results showed that in the internal of shrubs，on the whole，the highest
TOC，AOC and NOC contents were in the medium crown of C. korshinskii（P<0.01），medium crown was a turning
point of C. korshinskii soil organic carbon accumulation，it was the most concentrated expression of“ fertile island
effect” with internal of shrubs. In the external of shrubs，TOC and NOC of small crown in the crusts grassland and
mobile sand dune grassland were higher than those in the large crown significantly（ P<0.01），the variation of AOC
was opposite. It suggested that soil carbon sequestration showed a decreasing trend after a increase，the best soil
carbon sequestration was in the medium crown of C. korshinskii. C. korshinskii soil carbon sequestration effects were
the integrated action of C. korshinskii and crusts grassland. |
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