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Chinese Journal of Applied Ecology ›› 2017, Vol. 28 ›› Issue (9): 2813-2822.doi: 10.13287/j.1001-9332.201709.014

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Spatial distribution pattern of seedlings and saplings of three forest types by natural regene-ration in Daxin’an Mountains Xinlin Forestry Bureau, China.

JIA Wei-wei1, XIE Xi-tao1, JIANG Sheng-wei2, LI Feng-ri1*   

  1. 1College of Forestry, Northeast Forestry University, Harbin 150040, China;
    2Liaoning Province Forestry Department, Shenyang 110001, China.
  • Received:2016-12-19 Online:2017-09-18 Published:2017-09-18
  • Contact: * E-mail: fengrili@126.com
  • Supported by:

    This work was supported by the Spatial Distribution and Diversity of Forest Vegetation in City and County Forest Area of Heilongjiang Province Funded by Forestry Monitoring and Planning Institute of Heilongjiang Province, the Heilongjiang Province Forestry Department Heilongjiang Province Sustainable Forest Management Experimental Demonstration Zone Construction Program, and the Research and Demonstration Technology of Stand Density Control in Daxing’anling Forest Region.

Abstract: Based on the survey data of 16 sampling plots in three main forest types (including Larix gmelinii forest, Betula platyphylla forest, and mixed coniferous and broad-leaved forest) in Daxing’an Mountains, the seedlings and saplings were divided into 3 grades according to plant height, i.e., Grade I, height ≤ 60 cm; Grade II, 60 cm < height ≤ 200 cm; Grade III, height ≥ 200 cm and diameter at breast height <5 cm. With four different sampling scales, distribution pattern and pattern intensity of seedlings and saplings were determined, and the pattern change and size were analyzed using seven clumping indices. The results showed that the seedlings and saplings of L. gmelinii were dominated by grade II, and the density increased first and then decreased with the increase of grade. However, L. gmelinii in the other two forest types (i.e., B. platyphylla forest and mixed fore-st) and B. platyphylla seedlings and saplings in all three forest types were dominated by grade III, with the smallest number in grade I, and the seedling density increased with the increase of grade level. L. gmelinii seedlings and saplings in the three forest types all had a clumping pattern on four different sampling scales. B. platyphylla seedlings and saplings in B. platyphylla forest also had a clumping pattern on four scales except the random distribution on 10 m × 20 m scale. L. gmelinii seedlings and saplings in mixed forest had the largest clumped intensity on 5 m × 10 m sampling scale, while L. gmelinii in the other two forest types and B. platyphylla seedlings and saplings in the three forest types had the largest clumped intensity with the sampling scale of 5 m×5 m. The clumped intensities of L. gmelinii and B. platyphylla seedlings and saplings in L. gmelinii forest decreased with the increase of grade level, in which the distribution of B. platyphylla changed from clumping to random or uniform pattern. The clumped intensities of L. gmelinii and B. platyphylla seedlings and saplings in B. platyphylla forest and mixed forest increased with the increasing grade, changed from uniform to clumping pattern. The L. gmelinii and B. platyphylla seedlings and saplings with different regeneration grades in all three forest types had the same population pattern size of 25 m2. The population pattern intensities of L. gmelinii and B. platyphylla seedlings and saplings were significantly different in different forest types and regeneration grades.