南京林业大学学报(自然科学版) ›› 2024, Vol. 48 ›› Issue (6): 145-156.doi: 10.12302/j.issn.1000-2006.202305007

• 研究论文 • 上一篇    下一篇

阔叶红松林下幼苗、幼树定植生境散射辐射特征

杜昕1(), 董雪1, 谷会岩1,2, 陈祥伟1,2,*()   

  1. 1.森林生态系统可持续经营教育部重点实验室,东北森林资源培育国家林业和草原局重点实验室,东北林业大学林学院,黑龙江 哈尔滨 150040
    2.黑龙江凉水森林生态系统国家野外科学观测研究站,黑龙江 伊春 153000
  • 收稿日期:2023-05-07 修回日期:2024-03-06 出版日期:2024-11-30 发布日期:2024-12-10
  • 通讯作者: *陈祥伟(chenxwnefu@163.com),教授。
  • 作者简介:

    杜昕(1608898299@qq.com)。

  • 基金资助:
    科技基础资源调查专项(2021FY100702);林业公益性行业科研专项(201404303)

Diffuse radiation environment of regeneration seedlings and saplings under a broadleaved-Korean pine forest

DU Xin1(), DONG Xue1, GU Huiyan1,2, CHEN Xiangwei1,2,*()   

  1. 1. Key Laboratory of Sustainable Forest Ecosystem Management-Ministry of Education, Key Laboratory of National Forestry and Grassland Administration on Northeastern Forest Silviculture, College of Forestry, Northeast Forestry University, Harbin 150040, China
    2. Liangshui National Key Field Observation and Research Station for Forest Ecosystem, Yichun 153000, China
  • Received:2023-05-07 Revised:2024-03-06 Online:2024-11-30 Published:2024-12-10

摘要:

【目的】为探明阔叶红松林下常见乔木树种更新幼苗、幼树的光强需求,分析了各树种更新对林下光强的响应差异,进而为阔叶红松林及相关生态系统的科学经营提供支持。【方法】以凉水国家级自然保护区内4块阔叶红松林调查样地林下红松(Pinus koraiensis)、红皮云杉(Picea koraiensis)、臭冷杉(Abies nephrolepis)、春榆(Ulmus davidiana)、色木槭(Acer pictum)、青楷槭(Acer tegmentosum)、花楷槭(Acer ukurunduense)、紫椴(Tilia amurensis)、水曲柳(Fraxinus mandshurica)9种常见乔木更新的幼苗、幼树为研究对象,在个体水平上计算各株更新幼苗、幼树定植生境的加权进界邻体散射荫蔽度(WINDSD),计算各树种幼苗、幼树定植生境的WINDSD平均值、标准差及分布倾向度。以Mann-Whitney U检验分析各树种幼树、幼苗定植生境的WINDSD与阔叶红松林下均匀布设样点间的差异显著性及同种树种幼苗与幼树定植生境WINDSD间的差异显著性;同时,以蒙特卡罗法检验各类乔木更新幼苗、幼树种群定植生境与阔叶红松林下同等规模的随机分布种群定植生境的WINDSD分布倾向度间的差异显著性。【结果】阔叶红松林下均匀布设样点的WINDSD均值与标准差分别为0.538及0.213,分布倾向度为1.069。红松、红皮云杉、臭冷杉、春榆、色木槭、青楷槭、花楷槭、紫椴、水曲柳9种乔木树种的更新幼树、幼苗中,仅有春榆幼树及水曲柳幼树定植生境的WINDSD平均值与分布倾向度小于林下均匀布设样点。基于均值与分布倾向度共同判断,红松、红皮云杉、臭冷杉及紫椴更新幼树定植生境中的散射辐射强度弱于更新幼苗定植生境;春榆、色木槭、青楷槭、花楷槭、水曲柳更新幼树定植生境的散射辐射强度强于更新幼苗定植生境。蒙特卡罗检验与Mann-Whitney U检验共同显示,红松、红皮云杉、臭冷杉、春榆、色木槭、青楷槭、水曲柳更新幼苗定植生境的WINDSD显著大于阔叶红松林下均匀布设样点,花楷槭、紫椴更新幼苗定植生境的WINDSD与林下均匀布设样点无显著差异;红松、红皮云杉、臭冷杉更新幼树定植生境的WINDSD显著大于阔叶红松林下均匀布设样点,而其余树种更新幼树定植生境的WINDSD与林下均匀布设样点无显著差异。Mann-Whitney U检验显示,9种乔木树种中春榆、色木槭幼树定植生境WINDSD与对应树种更新幼苗定植生境WINDSD间的差异达到显著水平(P<0.05)。【结论】阔叶红松林主要乔木更新幼苗及幼树倾向分布于林下光强较弱的区域内。相较于更新幼苗,更新幼树定植的生境内光强总体上相对更强。不同树种更新对林下光强差异的响应有所不同,红松、红皮云杉、臭冷杉幼苗与幼树定植生境的光强差异不明显,而春榆、色木槭、青楷槭幼树定植生境的光照强度明显强于对应树种幼苗的定植生境。

关键词: 阔叶红松林, 森林天然更新, 光照强度, 加权进界邻体散射荫蔽度, 蒙特卡罗检验

Abstract:

【Objective】This study aims to determine the light intensity requirements for the regeneration of seedlings and saplings in mixed broadleaved-Korean pine (Pinus koraiensis) forests. Additionally, it seeks to investigate how the regeneration of different tree species responds to variations in light intensity. This research guides the scientific management and conservation efforts of broadleaved-Korean pine forests and their ecosystems.【Method】The research focused on nine common tree species: Pinus koraiensis, Picea koraiensis, Abies nephrolepis, Ulmus davidiana, Acer pictum, Acer tegmentosum, Acer ukurunduense, Tilia amurensis, and Fraxinus mandshurica, across four plots in the Liangshui National Nature Reserve. The weighted inside-boundary neighbor diffuse shading degree (WINDSD) was computed for the planting habitats of each seedling and sapling. The mean, standard deviation, and distribution tendency degree of WINDSD were calculated for the planting habitats of each tree species’ seedlings and saplings. The Mann-Whitney U test was employed to identify significant differences in WINDSD among the planting habitats of each tree species and uniformly distribute sample points beneath the broadleaved-Korean pine forest canopy. The analysis is extended to compare the differences in WINDSD among the planting habitats of seedlings and saplings for each tree species. Additionally, the Monte Carlo method was utilized to ascertain significant differences in the distribution tendency degree of WINDSD between the planting habitats of seedlings and saplings for various tree species populations and a random distribution population of equivalent size for each tree species.【Result】The analysis revealed that the mean and standard deviation of WINDSD for the uniformly distributed sample points of the broadleaved-Korean pine forest were 0.538 and 0.213, respectively, with a distribution tendency degree of 1.069. Among the seedlings and saplings of the nine tree species studied, only Ulmus japonica and Fraxinus mandshurica saplings exhibited a lower average value and distribution tendency degree of WINDSD compared to the uniformly distributed sample points in the forest. The analysis also indicated that the diffuse radiation intensity within the saplings’ planting habitats for Pinus koraiensis, Picea koraiensis, Abies nephrolepis, and Tilia davidiana was weaker compared to those designated for seedling regeneration. The Monte Carlo and Mann-Whitney U tests highlighted that the WINDSD in the planting habitats of seedlings for Pinus koraiensis, Picea koraiensis, Abies nephrolepis, Ulmus davidiana, Acer pictum, Acer tegmentosum, and Fraxinus mandshurica was significantly higher than that of the uniformly distributed sample points. In contrast, the WINDSD values for the planting habitats of Acer ukurunduense and Tilia amurensis seedlings did not significantly differ from those of the uniformly distributed sample points in the forest. For saplings, the WINDSD values in the planting habitats of Pinus koraiensis, Picea koraiensis, and Abies nephrolepis were significantly higher compared to the uniformly distributed sample points, whereas those for the saplings of other species did not significantly differ. Additionally, the Mann-Whitney U test indicated significant differences in WINDSD between the planting habitats of saplings and seedlings for Ulmus japonica and Acer mono (P<0.05).【Conclusion】The findings suggest that seedlings and saplings of the primary tree species in the broadleaved-Korean pine forest are usually found in areas with weaker light on the forest floor. Compared to seedlings, saplings tend to establish in habitats with slightly stronger light intensity. Different tree species exhibit varied responses to light intensity variations under the forest canopy. The differences in light intensity between habitats for seedlings and saplings are not pronounced for Pinus koraiensis, Picea koraiensis, and Abies nephrolepis, whereas the light intensity in the sapling habitats of Ulmus davidiana, Acer pictum, and Acer tegmentosum is significantly higher than in their seedling regeneration areas.

Key words: broadleaved-Korean pine forest, natural forest regeneration, light intensity, weighted inside-boundary neighbor diffuse shading degree (WINDSD), Monte Carlo test

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