title: [Decline regularity and causes of Pinus sylvestris var. mongolica plantation on sandy land].
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 non-infectious 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.
authors.affiliation: Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China.
authors.forename: Xiangyun
authors.initials: X
authors.lastname: Wu
authors.forename: Fengqi
authors.initials: F
authors.lastname: Jiang
authors.forename: Xiaodan
authors.initials: X
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Xue
authors.forename: Sufen
authors.initials: S
authors.lastname: Qiu
mesh_terms: D000383:Agriculture; D018533:Biomass; D002681:China; D003889:Desert Climate; D017753:Ecosystem; D041605:Pinus sylvestris / Q000254:growth & development* / Q000502:physiology; D010935:Plant Diseases; D011891:Rain; D012822:Silicon Dioxide; D012987:Soil / Q000032:analysis*; D014867:Water / Q000032:analysis
chemical_list: D012987:Soil; D014867:Water; D012822:Silicon Dioxide