Huang Cai Zhi, Zhang Wen Hui, Xing Zhong Li, Yu Bi Yun, Ye Quan Ping, Xue Wen Yan
Key Comprehensive Laboratory of Forestry in Shaanxi Province, Northwest A&F University, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2016 Dec;27(12):3838-3844. doi: 10.13287/j.1001-9332.201612.028.
Taking the Quercus liaotungensis middle-aged forests in Huanglong and Qiaoshan Mountains as study objects, the average size of individual trees of Q. liaotungensis, yield and rate of its reproductive modules, as well as their spatial distribution characteristics were investigated in five years after thinning at different intensities (CK, 10%, 20% and 30%), in order to demonstrate the impact of thinning intensity on reproductive modules of Q. liaotungensis. Thinning intensity had no significant effect on average height and average DBH, while it had significant positive correlation with crown area and crown volume. The yield of generative shoots, young fruits and mature fruits increased with thinning intensity, but vegetative shoots, staminate inflorescence, staminate flowers and pistillate flowers of Q. liaotungensis had little change. The yield of generative shoots, young fruits and mature fruits had raised significantly under 20% thinning, and reached the maximum under 30% thinning intensity. The rate of generative shoots and fruit setting rate increased with thinning intensity, and reached significant level under 20% or 30% thinning compared with the control. About three-quarters of the generative shoots, female and male flowers centered in the upper canopy, and the rest were in the lower part. Numbers of reproductive modules at sunny side accounted for about 65% of the total. The lower crown, shaded generative shoots, pistillate flowers and staminate inflorescence increased with the increasing thinning intensity, and the upper crown, sunny generative shoots, pistillate flowers and staminate inflorescence showed a decreasing trend with the increasing thinning intensity. Thinning at the intensity of 30% (canopy density 0.6) was the best, which could greatly improve the fruit set percentage of Q. liaotungensis and its mature rate, so as to improve the seed yield and quality, providing the guarantee for the seed collection and natural regeneration of Q. liaotungensis forests.
以黄龙山区和桥山山区的辽东栎中龄林为研究对象，对不同强度（对照、10%、20%和30%）间伐后5年辽东栎单株平均大小、生殖构件产量和比率及其空间分布特征进行了调查，以阐明间伐强度对辽东栎生殖构件的影响。间伐强度对辽东栎平均树高和平均胸径无显著影响，但与冠幅和冠体积呈显著正相关。生殖枝、幼果和成熟果产量随间伐强度增加而增加，而辽东栎的营养枝、雄花序、雄花和雌花变化不大。间伐强度为20%时，生殖枝、幼果和成熟果产量显著提高，间伐强度为30%时达到最高。生殖枝比率和坐果率随间伐强度增加而增加，与对照相比，间伐强度为20%或30%时达到显著水平。约四分之三的生殖枝、雌花和雄花集中在上层树冠，其余在下层。阳面生殖构件数量约占总数的65%。随着间伐强度增加，下层树冠、阴面生殖枝、雌花和雄花序增加，而上层树冠、阳面生殖枝、雌花和雄花序呈下降趋势。间伐强度为30%（郁闭度0.6）时最佳，可大幅提高辽东栎坐果率和成熟率，从而提高种子产量和质量，为辽东栎林种子采集和天然更新提供保障。
