Wu Jing-Lian, Wang Miao, Lin Fei, Hao Zhan-Qing, Ji Lan-Zhu, Liu Ya-Qin
Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
Ying Yong Sheng Tai Xue Bao. 2009 Feb;20(2):235-40.
Aiming at the variation of precipitation pattern caused by global warming, a field simulation experiment was conducted to study the effects of 30% increase (+W) and decrease (-W) of precipitation on the morphology, growth, and biomass partitioning of mono- and mixed cultured seedlings of Quercus mongolica and Pinus koraiensis, the two dominant tree species in temperate broad-leaved Korean pine mixed forest in Changbai Mountains. Comparing with monoculture, mixed culture increased the canopy width and main root length of Q. mongolica seedlings, but decreased the basal diameter, plant height, leaf number, and dry masses of root, stem, leaf and whole plant of P. koraiensis seedlings significantly. Treatment (-W) increased the stem/mass ratio while decreased the main root length of Q. mongolica seedlings, and decreased the main root length, leaf number, dry masses of leaf and whole plant, and leaf/mass ratio, while increased the stem/mass ratio of P. koraiensis seedlings significantly, compared with treatment CK. Treatment (+W) had no significant effect on these indices of the two species. At early growth stage, interspecific competition and precipitation pattern had significant effects on the morphology and growth of the seedlings, and the responses were much stronger for P. koraiensis than for Q. mongolica.
针对全球变暖导致的降水格局变化，开展了一项田间模拟试验，研究长白山温带阔叶红松混交林两种优势树种蒙古栎和红松的单种与混种幼苗，在降水增加30%（+W）和减少30%（-W）条件下对其形态、生长及生物量分配的影响。与单种相比，混种增加了蒙古栎幼苗的冠幅和主根长度，但显著降低了红松幼苗的地径、株高、叶片数量以及根、茎、叶和整株的干质量。与对照处理相比，处理（-W）增加了蒙古栎幼苗的茎干质量比，降低了其主根长度，显著增加了红松幼苗的茎干质量比，同时降低了其主根长度、叶片数量、叶干质量和整株干质量以及叶质量比。处理（+W）对这两个树种的这些指标没有显著影响。在生长初期，种间竞争和降水格局对幼苗的形态和生长有显著影响，红松的响应比蒙古栎更强。
