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  • Title: [Growth characteristics of different tree species in shelterbelts in the depression area of Hebei Province, China.].
    Author: Zhang JM, Yu XX, Jia GD, Liu ZQ, Lu WW.
    Journal: Ying Yong Sheng Tai Xue Bao; 2017 Oct; 28(10):3174-3180. PubMed ID: 29692134.
    Abstract:
    This research investigated shelterbelt structure indices using the standard sampling method, to study the dynamic changes of different tree species including Ulmus pumila, Populus simonii and Pinus tabuliformis in the depression area in Xiaobazi Township of Fengning County, Hebei Province, China. The results showed that the average age of U. pumila, P. simonii and P. tabuliformis pure forests was 10 years in this area. The average DBH and tree height of P. simonii pure forest were 2.3 times and 3.8 times as those of U. pumila pure forest, as well as, 2.3 times and 3.0 times as those of P. tabuliformis pure forest, respectively. The average DBH, tree height, LAI and height of first live branch of P. simonii pure forest were significantly larger than those of U. pumila pure forest and P. tabuliformis pure forest. Compared with P. simonii mixed forest, the stand density of P. simonii pure forest was 10.8% higher, average DBH of pure forest was 5.2% lower, and average tree height was 11.3% lower. Compared with U. pumila mixed forest, the stand density of U. pumila pure forest was 6.6% higher, average DBH and tree height of pure forest were 7.8% and 14.2% lower. Compared with P. tabuliformis mixed forest, the stand density of P. tabuliformis pure forest was 4.9% larger, but average DBH and tree height were 29.3% and 31.8% lower, respectively. The average DBH, tree height of different forest types showed significant negative correlation with the stand density. Average LAI showed significant positive correlation with density and height of first live branch, and significant negative correlation with the DBH, tree height. There was a significant positive relationship between the average height of first live branch and stand density. The increments of DBH and tree height of coniferous and broad-leaved mixed forest were significantly higher than those of coniferous pure forest. The comprehensive growth potential of the shelterbelts tended to increase, and the lateral growth potential on the whole exhibited a declining trend. 采用标准样地调查法对防护林林分结构指标进行调查，研究河北坝下地区丰宁县小坝子乡不同防护林树种榆树、杨树及油松的动态变化规律.结果表明： 该区域榆树、杨树和油松纯林的平均年龄均为10年，杨树纯林的平均胸径和树高分别是榆树纯林的2.3和3.8倍，是油松纯林的2.3和3.0倍.杨树纯林的平均胸径、树高、叶面积指数(LAI)、活枝下高等指标显著大于榆树纯林和油松纯林.与杨树混交林相比，杨树纯林的林分密度高10.8%，纯林平均胸径则低5.2%，平均树高低11.3%；与榆树混交林相比，榆树纯林的林分密度高6.6%，纯林平均胸径、树高分别低7.8%和14.2%；与油松混交林相比，油松纯林的林分密度大4.9%，纯林平均胸径和树高分别低29.3%和31.8%.各林分类型的平均胸径、树高与密度呈显著负相关；平均LAI与密度和活枝下高呈显著正相关，与胸径、树高呈显著负相关；平均活枝下高与密度呈显著正相关.针阔混交林的胸径和树高生长显著优于针叶纯林.该区域防护林综合生长潜力呈上升趋势，而横向生长潜力总体上呈下降趋势.
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