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Citation:

Effects of A rm en iaca sibirica-Astraga lus System on So il Physi-chem ica lProperties of the Hill and Gully Area on the Loess Pla teau

  • Received Date: 2007-06-12
  • Based on the A rm en iaca sibirica-Astraga lus system in hill-gully area of the Loess Plateau Regions, theeffects of Astragalus intercropped in A rm eniaca sibirica orchard after two years on the soil physical and chemicalp roperties was studied. The results showed that there existed vertical distribution gradation and the horizontaldistribution difference in soil physical and chemical p roperties. Compare with A rm eniaca sibirica without covering,the average soil density of the 0—60 cm soil layer in A rm eniaca sibirica-Astragalus system decreased by 0. 8—1. 4 g·cm-3 , the soil total porosity increased by 1. 6% —4. 7%, and the soil saturated hydraulic conductivityincreased by 0. 10—0. 35 mm ·min-1 , respectively. At the same time, the total N, total K and available N,available K increased by 0. 10—0. 32, 0. 8—5. 5 g·kg-1 , 1. 3—13. 3 mg·kg-1 and 3. 0—33. 7 mg·kg-1 ,respectively. The soil organic matter increased by 0. 03—0. 52 g·kg-1 , especially, which increased by 0. 40—0. 52 g·kg-1 in the layer of 0—20 cm. But the total P and available P decreased by 0. 02—0. 15 g·kg-1 and0. 07—1. 48 mg·kg-1. The effect of intercropp ing Astraga lus on soil physical and chemical p roperties which in different distance from tree row were different, the nearer to the tree row, the bigger effect is. Regression showedthat there were good positive correlation between the soil saturated hydraulic conductivity and the soil density, thenegative correlation between the soil saturated hydraulic conductivity and soil total porosity. There was goodfeasibility of intercropp ing Astragalus in A rm eniaca sibirica orchard, and this model can be penetrated in hill-gullyarea of the Loess Plateau Regions.
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Effects of A rm en iaca sibirica-Astraga lus System on So il Physi-chem ica lProperties of the Hill and Gully Area on the Loess Pla teau

  • 1. Research Institute of Forestry, CAF
  • 2.  Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China

Abstract: Based on the A rm en iaca sibirica-Astraga lus system in hill-gully area of the Loess Plateau Regions, theeffects of Astragalus intercropped in A rm eniaca sibirica orchard after two years on the soil physical and chemicalp roperties was studied. The results showed that there existed vertical distribution gradation and the horizontaldistribution difference in soil physical and chemical p roperties. Compare with A rm eniaca sibirica without covering,the average soil density of the 0—60 cm soil layer in A rm eniaca sibirica-Astragalus system decreased by 0. 8—1. 4 g·cm-3 , the soil total porosity increased by 1. 6% —4. 7%, and the soil saturated hydraulic conductivityincreased by 0. 10—0. 35 mm ·min-1 , respectively. At the same time, the total N, total K and available N,available K increased by 0. 10—0. 32, 0. 8—5. 5 g·kg-1 , 1. 3—13. 3 mg·kg-1 and 3. 0—33. 7 mg·kg-1 ,respectively. The soil organic matter increased by 0. 03—0. 52 g·kg-1 , especially, which increased by 0. 40—0. 52 g·kg-1 in the layer of 0—20 cm. But the total P and available P decreased by 0. 02—0. 15 g·kg-1 and0. 07—1. 48 mg·kg-1. The effect of intercropp ing Astraga lus on soil physical and chemical p roperties which in different distance from tree row were different, the nearer to the tree row, the bigger effect is. Regression showedthat there were good positive correlation between the soil saturated hydraulic conductivity and the soil density, thenegative correlation between the soil saturated hydraulic conductivity and soil total porosity. There was goodfeasibility of intercropp ing Astragalus in A rm eniaca sibirica orchard, and this model can be penetrated in hill-gullyarea of the Loess Plateau Regions.

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