森林内部结构复杂性和树种多样性对森林生产力的协调影响

IF 6.2 3区综合性期刊 Q1 Multidisciplinary

Fundamental Research Pub Date : 2024-09-01 DOI:10.1016/j.fmre.2022.10.005

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引用次数: 0

摘要

森林结构的复杂性可以调节林冠内的光照和水分分布，并对森林生物多样性和碳储存能力产生直接影响。一般认为，森林结构复杂性的增加可提高树种多样性和森林生产力，但两者之间的关系报道并不一致。在此，我们利用无人机光探测和测距数据从三个方面（即水平、垂直和内部结构复杂性）量化了森林结构复杂性，并结合在中国纬度梯度较大的三个森林生物群落的实地测量结果，研究了它们与树种多样性和森林生产力的相关性。结果表明，内部结构复杂性与树种丰富度的相关性（相关系数=0.85）强于水平结构复杂性（相关系数=-0.16）和垂直结构复杂性（相关系数=0.61），是唯一与树种丰富度和树种均匀度均有显著相关性的森林结构复杂性属性。在森林结构复杂性、树种多样性和森林生产力之间的相关性中观察到了强烈的尺度效应。此外，通过结构方程模型分析，森林内部结构复杂性与树种多样性对森林生产力具有紧密的正向协调贡献，而水平和垂直结构复杂性属性的协调效应不明显或弱于内部结构复杂性，这表明对森林内部结构复杂性的忽视可能会部分导致目前森林结构复杂性、树种多样性和森林生产力之间观测结果的不一致。本研究的结果为理解森林结构复杂性、树种多样性和森林生产力之间不一致的相关性提供了一个新的视角。

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The coordinated impact of forest internal structural complexity and tree species diversity on forest productivity across forest biomes

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The coordinated impact of forest internal structural complexity and tree species diversity on forest productivity across forest biomes

Forest structural complexity can mediate the light and water distribution within forest canopies, and has a direct impact on forest biodiversity and carbon storage capability. It is believed that increases in forest structural complexity can enhance tree species diversity and forest productivity, but inconsistent relationships among them have been reported. Here, we quantified forest structural complexity in three aspects (i.e., horizontal, vertical, and internal structural complexity) from unmanned aerial vehicle light detection and ranging data, and investigated their correlations with tree species diversity and forest productivity by incorporating field measurements in three forest biomes with large latitude gradients in China. Our results show that internal structural complexity had a stronger correlation (correlation coefficient = 0.85) with tree species richness than horizontal structural complexity (correlation coefficient = -0.16) and vertical structural complexity (correlation coefficient = 0.61), and it was the only forest structural complexity attribute having significant correlations with both tree species richness and tree species evenness. A strong scale effect was observed in the correlations among forest structural complexity, tree species diversity, and forest productivity. Moreover, forest internal structural complexity had a tight positive coordinated contribution with tree species diversity to forest productivity through structure equation model analysis, while horizontal and vertical structural complexity attributes have insignificant or weaker coordinated effects than internal structural complexity, which indicated that the neglect of forest internal structural complexity might partially lead to the current inconsistent observations among forest structural complexity, tree species diversity, and forest productivity. The results of this study can provide a new angle to understand the observed inconsistent correlations among forest structural complexity, tree species diversity, and forest productivity.

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