Zhu Jiao-Jun, Kang Hong-Zhang, Xu Mei-Ling, Wu Xiang-Yun, Wang Wei
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Ying Yong Sheng Tai Xue Bao. 2007 Dec;18(12):2693-8.
Based on the observations of air temperature, soil temperature, and root systems of Pinus sylvestris var. mongolica plantations on southeastern Keerqin sandy land, the decline mechanisms of the plantations were analyzed from the aspect of the effects of temperature on the growth and survival of ectomycorrhizal fungi (ECM). The results indicated that ECM could hardly survive with in 0-5 cm soil layer because of its high temperature environment, but the temperature condition in 20-40 cm soil layer was suitable for the survival and growth of ECM. 78% of the roots of 13-42 years old P. sylvestris var. mongolica tress were distributed in 20-40 cm soil layer, which suggested that the existence of ECM in this soil layer inhibited or alleviated the decline of the P. sylvestris var. mongolica plantations, and was not the inducing factor of the plantations' top withering, low growth rate, and tree death. The lack of ECM in surface soil layer (0-5 cm) could be one of the main reasons leading to the death of seedlings root systems, and thus, the failure of P. sylvestris var. mongolica plantations' regeneration.
基于对科尔沁沙地东南部樟子松人工林气温、土壤温度及根系的观测，从温度对外生菌根真菌（ECM）生长和存活的影响方面分析了人工林衰退机制。结果表明，由于0-5厘米土层温度较高，ECM在该土层几乎无法存活，但20-40厘米土层的温度条件适合ECM的存活和生长。13-42年生樟子松13-42年生樟子松78%的根系分布在20-40厘米土层，这表明该土层中ECM的存在抑制或缓解了樟子松人工林的衰退，并非人工林顶部枯萎、生长速率低和树木死亡的诱导因素。表层土壤（0-5厘米）中ECM的缺乏可能是导致苗木根系死亡进而樟子松人工林更新失败的主要原因之一。
