高级检索
    罗桂生, 马履一, 贾忠奎, 吴丹妮, 迟明峰, 张淑敏, 赵贵娟. 油松人工林林隙天然更新及与环境相关性分析[J]. 北京林业大学学报, 2019, 41(9): 59-68. DOI: 10.13332/j.1000-1522.20180416
    引用本文: 罗桂生, 马履一, 贾忠奎, 吴丹妮, 迟明峰, 张淑敏, 赵贵娟. 油松人工林林隙天然更新及与环境相关性分析[J]. 北京林业大学学报, 2019, 41(9): 59-68. DOI: 10.13332/j.1000-1522.20180416
    Luo Guisheng, Ma Lüyi, Jia Zhongkui, Wu Danni, Chi Mingfeng, Zhang Shumin, Zhao Guijuan. Correlation analysis between natural regeneration and environment in canopy gap of Chinese pine (Pinus tabuliformis) plantation[J]. Journal of Beijing Forestry University, 2019, 41(9): 59-68. DOI: 10.13332/j.1000-1522.20180416
    Citation: Luo Guisheng, Ma Lüyi, Jia Zhongkui, Wu Danni, Chi Mingfeng, Zhang Shumin, Zhao Guijuan. Correlation analysis between natural regeneration and environment in canopy gap of Chinese pine (Pinus tabuliformis) plantation[J]. Journal of Beijing Forestry University, 2019, 41(9): 59-68. DOI: 10.13332/j.1000-1522.20180416

    油松人工林林隙天然更新及与环境相关性分析

    Correlation analysis between natural regeneration and environment in canopy gap of Chinese pine (Pinus tabuliformis) plantation

    • 摘要:
      目的油松为我国北方地区主要造林树种。通过探讨环境因子与油松更新苗生长的相关关系,阐明了油松人工林抚育间伐形成的林隙对其天然更新影响的内在机制。
      方法在油松人工纯林设置4种林隙等级,即林隙直径和冠层平均树高之比分别为L-I(0.75 H)、L-II(1.00 H)、L-III(1.25 H)(H为冠层均高)和对照(CK,林冠下),每种林隙等级设置3个重复,并根据边界木的平均冠幅将每个林隙分为林隙中心区域(B),林隙边缘区域(C)和林隙周边区域(D)。调查了油松更新状况,同时测量生长旺季的光合有效辐射、空气温度、空气湿度、土壤温度和土壤湿度等环境因子,在此基础上,分析了不同林隙等级下物种组成和生长状况的差异性,以及与环境因子的关系。
      结果结果表明:①所有林隙等级中油松更新苗数量均占绝大部分(> 82.6%),油松更新苗数量所占比例并没有显著差异(P > 0.05)。②林隙等级对总的更新苗平均密度、平均高度和平均当年高生长都有显著影响(P < 0.05),平均密度随着林隙面积的增大而减小,最大值为1.72株/m2;平均高度随林隙面积的增大而增大,最大值为120.41 cm;平均当年高生长最大值在L-II林隙中,为14.41 cm。③同一等级林隙内的不同区域对总的更新苗平均密度有显著影响(P < 0.05),且无论林隙大小,最大密度总是位于C区域,而更新苗当年高生长只有在L-II等级林隙内的不同区域间才有显著差异。④L-I和L-II等级林隙光合有效辐射与更新苗苗高和当年高生长均呈显著的正相关(P < 0.05),而总的更新苗密度与土壤温度只在L-I等级林隙达到了显著的负相关水平(P < 0.05),空气湿度和土壤含水量只在特定等级林隙中与部分更新特征显著相关。
      结论初步结论:油松人工林内,间伐产生的林隙对天然更新有明显的促进作用,而对植物物种组成影响不大;林隙的大小主要通过影响光合有效辐射对油松更新状况产生影响;所研究的5个环境因子中,林隙光合有效辐射和土壤温度是影响更新苗更新状况的主要因子。

       

      Abstract:
      Objective Pinus tabuliformis is the main afforestation tree species in northern China. This paper aims to elucidate the internal mechanism of the influence of forest gap formed by tending and thinning on the natural regeneration of Chinese pine plantation and to explore the correlation between environmental factors and the growth of regeneration established.
      Method We established four forest gap classes based on the forest-gap breadth to the average height (H) of surrounding trees, which was classified into small (0.75 H), medium (1.00 H), large (1.25 H) gaps and closed canopy reference plots (CK) in a plantation. Three repetitions were set for each gap size class. Each gap was divided into B(gap center area), C(gap edge area) and D(gap surrounding area).We investigated the regeneration performance of Chinese pine and measured the environmental factors (photosynthetically active radiation, air temperature, air humidity, soil temperature and soil humidity) during the growth peak season. We then analyzed the difference of species composition and growth status among the different gap size classes, and their relationship with environmental factors.
      Result The number of Chinese pine regeneration seedling accounted for more than 82.6% of that of the total regenerated tree species. No significant difference was found in the proportion of Chinese pine regeneration number to all tree species among different gap size classes (P > 0.05). Gap sizes significantly influenced their mean density,mean height and mean current height (P < 0.05). The average density decreased with the increase of gap size, and the maximum value was 1.72 plant/m2; the average height increased with the increase of the gap size, and the maximum value was 120.41cm; the maximum value of average current height was 14.41 cm, which distributed in the L-II gap. The average density was significantly affected by different sections within the same gap size class (P < 0.05), the maximum density frequently distributed in section C no matter what gap size was. The tree current height was significantly different only in different sections within the L-II (P < 0.05). A significantly positive correlation existed between the photosynthetic active radiation and the height, and current height of regeneration in the L-I and L-II (P < 0.05). A significant negative correlation between regeneration seedling density and soil temperature only occurred in L-I (P < 0.05). air humidity and soil moisture were significantly correlated with some regeneration characteristics only in certain forest gaps.
      Conclusion The gap generated from thinning for Chinese pine plantation has obvious promoting effect on natural regeneration, but has little effect on plant species composition; The gap size class mainly affected the performance of Chinese pine regeneration seedlings by affecting the photosynthetically active radiation. Among the five environmental factors, photosynthetically active radiation and soil temperature were the main factors affecting the regeneration seedlings.

       

    /

    返回文章
    返回