Analysis of natural regeneration barriers of Pinus sylvestris varmongolica plantation on sandy land

Abstract

Abstract: By employing comparison analysis,and field experiment of watering and soil covering befroe overwintering for seedlings,the barriers of natural regeneration for Mongolian pine plantations on sandy soil were identified. The experimental area was divided into 3 parts according to the state of natural regeneration. Crown closure,litter,understory coverage,and site condition were the factors which affect natural regeneration. Water deficit,but not low temperature during overwintering,is the key factor that limits survival for 1～2 years old seedlings in plantation area. The water deficit is due to higher air temperature,less accumulated snow,higher soil evaporation,higher plant transpiration in plantation area than in the area in which Mongolian pine is naturally distributed. Based on the above research,it is necessary to take effective artificial measures to promote its natural regeneration so as to guarantee its successful development. The following measures are recommended:1)covering the 1～2 years old seedlings with soil before wintering,2)irrigating seedlings before wintering,3)suitable forest harvest,e.g.,belt clear cutting,or patch cutting,4)planting the pine with broadleaf species,5)protecting forest stands from livestock grazing,seed collecting and litter gathering.

Key words: Pinus sylvestris var. mongolica, Sand fixing plantation forest, Natural regeneration, Regeneration barriers, regulation suggestion, climatic potential productivity, “sickle bend” area, spring maize, climatic suitability

CLC Number:

S754.1

ZENG Dehui, YOU Wenzhong, FAN Zhiping, LIU Mingguo. Analysis of natural regeneration barriers of Pinus sylvestris varmongolica plantation on sandy land[J]. Chinese Journal of Applied Ecology, 2002, (3): 257-261.

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