Decline regularity and causes of Pinus sylvestris var.mongolica plantation on sandy land

Abstract

Abstract: The study showed that the decline of Pinus sylvestris var.mongolica plantation out of its natural distribution area was a phenomenon of premature senility.The infected harm of shoot blight was the direct cause of Pinus sylvestris var.mongolica dying,but wasn't the basic reason.The decline of Pinus sylvestris var.mongolica was caused by the interaction of biological and other factors,which was "the third disease" beyond infectious and noninfectious diseases,namely,"decline disease of forest".Climate difference,improper management,unbalanced usage of soil water,and high content of N settled from air were the inducing factors,among which,climate difference and unbalanced usage of soil water were the main ones,while insect harm and shoot blight were the promoting factors.

Key words: Pinus sylvestris var.mongolica, Sand-fixation plantation forest, Decline, Decline cause

CLC Number:

S718

WU Xiangyun, JIANG Fengqi, LI Xiaodan, XUE Yang, QIU Sufen . Decline regularity and causes of Pinus sylvestris var.mongolica plantation on sandy land[J]. Chinese Journal of Applied Ecology, 2004, (12): 2225-2228.

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