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Citation:

So il Respira tion of the Representa tive Artif ic ia l Forests Dur ing theM inor Growing Sea son in the Hilly Reg ion of North-China

  • Received Date: 2006-09-04
  • Soil resp iration of two rep resentative artificial forests during the minor growing season in the hilly region ofNorth2China, in case of 30 years old Platycladus orienta lis and 25 years old Ouercus variabili, were analyzed. Soilresp iration rate wasmeasured by L i-8100 automatic monitoring system, and the soil temperature and soilwater content wasmeasured by AR-A-ECH automatic monitoring system from Nov. of 2005 toMar. of 2006 . The main results are as follows: ( 1 ) For both the two artificial forests, soil resp iration rate ( SRR ) in clear-cloudy day wasmarkedly higher than that in overcast day, but the diurnal variation of SRR was not apparent under the two weatherconditions. Daily SRR changed significantly, and characterized with that SRR decreased sharp ly from November toJanuary of the next year, and maintained at a relatively low value in February, and then increased rap idly after themiddle ofMarch. Snowingmade SRR rise varying extents during this season. The average SRR of Platycladus orienta lis and Ouercus variabiliwere 0. 61μmol?m-2 ?s-1 and 0. 39μmol?m-2 ?s-1 respectively in the whole minor growing season. (2) Significant relationship were found between the two artificial forests SRR and soil temperaturesat the 0, 5, 10, 15 and 20 cm dep th from the soil surface ( p -2 ?s-1 and 1. 60-μmol?m-2 ?s-1 respectively. SRR was also correlatedwith the soilwater content ( p < 0. 01) , the regression equation for Platycladus orienta liswas linear, butmultinomialfor Ouercus variabili. SRR was significantly related to soil temperature ( Ts) and soil water content ( SW ) at 5 cmdep th. Ts was the most important factor that effected on SRR for both the two artificial forests through comparing thepartial coefficient of Ts and SW at the 5 cm dep th.
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So il Respira tion of the Representa tive Artif ic ia l Forests Dur ing theM inor Growing Sea son in the Hilly Reg ion of North-China

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

Abstract: Soil resp iration of two rep resentative artificial forests during the minor growing season in the hilly region ofNorth2China, in case of 30 years old Platycladus orienta lis and 25 years old Ouercus variabili, were analyzed. Soilresp iration rate wasmeasured by L i-8100 automatic monitoring system, and the soil temperature and soilwater content wasmeasured by AR-A-ECH automatic monitoring system from Nov. of 2005 toMar. of 2006 . The main results are as follows: ( 1 ) For both the two artificial forests, soil resp iration rate ( SRR ) in clear-cloudy day wasmarkedly higher than that in overcast day, but the diurnal variation of SRR was not apparent under the two weatherconditions. Daily SRR changed significantly, and characterized with that SRR decreased sharp ly from November toJanuary of the next year, and maintained at a relatively low value in February, and then increased rap idly after themiddle ofMarch. Snowingmade SRR rise varying extents during this season. The average SRR of Platycladus orienta lis and Ouercus variabiliwere 0. 61μmol?m-2 ?s-1 and 0. 39μmol?m-2 ?s-1 respectively in the whole minor growing season. (2) Significant relationship were found between the two artificial forests SRR and soil temperaturesat the 0, 5, 10, 15 and 20 cm dep th from the soil surface ( p -2 ?s-1 and 1. 60-μmol?m-2 ?s-1 respectively. SRR was also correlatedwith the soilwater content ( p < 0. 01) , the regression equation for Platycladus orienta liswas linear, butmultinomialfor Ouercus variabili. SRR was significantly related to soil temperature ( Ts) and soil water content ( SW ) at 5 cmdep th. Ts was the most important factor that effected on SRR for both the two artificial forests through comparing thepartial coefficient of Ts and SW at the 5 cm dep th.

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