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2014 | 62 | 2 |
Tytuł artykułu

Changes in soil organic carbon and its density fractions after shrub-planting for desertification control

Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Planting shrubs on sand land and degraded pasture are two main measures for desertification control particularly in northwest China. However, their effects on soil organic carbon (SOC) and its fractions remain uncertain. We assessed the changes in stocks of SOC, light fraction of SOC (LF–SOC) and heavy fraction of SOC (HF–SOC) after planting Artemisia ordosica (AO, 17 years), Astragalus mongolicum (AM, 5 years) and Salix psammophila (SP, 16 years) in sand land and planting Caragana microphylla (CM, 24 years) on degraded pasture. Results show that: 1) after planting AO, AM and SP on sand land, SOC stocks increased by 162.5%, 45.2% and 70.8%, respectively, and LF–SOC accounted for a large proportion in the increased SOC. Dry weights of LF–SOC, rather than carbon concentrations, were higher in shrublands than that in sand land; 2) after planting CM on degraded pasture, SOC stock decreased by 9.3% and all the loss was HF–SOC in 60–100 cm soil layer where both herbaceous fine root biomass (HFRB) and soil water content (SWC) also decreased. The results indicate that planting shrubs can result in an increase of SOC in sand land, whereas that can lead to a decrease of SOC in degraded pasture. The increase of SOC in sand land mainly bases on the accumulation of dry weight of LF–SOC. The loss of SOC in degraded pasture is caused by the decrease of carbon concentrations of HF–SOC, which can be related to the reduction of HFRB and SWC in deep soil layer. Therefore, shrub-planting for desertification control not always improve the quantity and stability of SOC in northwest China.
Wydawca
-
Rocznik
Tom
62
Numer
2
Opis fizyczny
p.205-216,fig.,ref.
Twórcy
autor
  • College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
autor
  • College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
autor
  • College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
autor
  • College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
autor
  • College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
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