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Citation:

Study on Proper Stand Density of Pinus sylvestris var. mongolica Plantation in Sandy Land Based on Stem Sap Flow Velocity

  • Received Date: 2015-01-19
  • The precise determination of transpirational water-consumption is of great significance of the judgement of stand water balance. The present proper density of Pinus sylvestris var. mongolica plantation was calculated by means of water balance based on 5 years' observation of the precipitation, the canopy interception, the forest evapotranspiration, the soil water content and the sap flow velocity(SFV) which was measured by thermal dissipation probe(TDP) during the growing season. The sap flow observation of P. sylvestris var. mongolica in Zhanggutai started in early April and ended in late October, the monthly average SFV during the growing season from April to October were 2.58, 4.78, 5.19, 5.01, 4.84, 4.30 and 1.93 cm·per hour respectively, the highest SFV appeared in June, higher SFV appeared in July, August, May and September successively and lower SFV appeared in April and October. Through calculating, the proper density of P. sylvestris var. mongolica in 14, 16, 18, 20 cm diameter class were 688, 531, 422 and 344 plants per hectare. Over-high density was the common problem existed in pure stands in the same diameter class.
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Study on Proper Stand Density of Pinus sylvestris var. mongolica Plantation in Sandy Land Based on Stem Sap Flow Velocity

  • 1. Liaoning Institute of Sand Fixation and Afforestation, Fuxin 123000, Liaoning, China
  • 2. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China

Abstract: The precise determination of transpirational water-consumption is of great significance of the judgement of stand water balance. The present proper density of Pinus sylvestris var. mongolica plantation was calculated by means of water balance based on 5 years' observation of the precipitation, the canopy interception, the forest evapotranspiration, the soil water content and the sap flow velocity(SFV) which was measured by thermal dissipation probe(TDP) during the growing season. The sap flow observation of P. sylvestris var. mongolica in Zhanggutai started in early April and ended in late October, the monthly average SFV during the growing season from April to October were 2.58, 4.78, 5.19, 5.01, 4.84, 4.30 and 1.93 cm·per hour respectively, the highest SFV appeared in June, higher SFV appeared in July, August, May and September successively and lower SFV appeared in April and October. Through calculating, the proper density of P. sylvestris var. mongolica in 14, 16, 18, 20 cm diameter class were 688, 531, 422 and 344 plants per hectare. Over-high density was the common problem existed in pure stands in the same diameter class.

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