Processes driving understory community dynamics in Ulleungdo Island broadleaved forest, South Korea,Ecological Research

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Processes driving understory community dynamics in Ulleungdo Island broadleaved forest, South Korea
Ecological Research ( IF 1.7 ) Pub Date : 2021-05-03 , DOI: 10.1111/1440-1703.12231
Songhie Jung ₁ , Hyung Seok Sim _{1,

2} , Jun Soo Kim ₃ , Kwan Ho Bae ₄ , Yong‐Chan Cho ₁

Affiliation

The development stage of forest trees has considerable impact on the understory plant species; however, little research has been dedicated to in-depth investigation of the changes in the ecological processes (deterministic and stochastic) over a mid-term observational period (≥10 years). We analyzed the forest floor environment, including bare mineral soil, tree communities (density and biomass), understory plant species composition, diversity, cover, and changes in co-occurring species in the Albongbunji Basin on Ulleungdo Island over an 11-year period (2009–2019). The forest floor environment exhibited a broad spectrum of changes, beginning in the middle of the observation period and after heavy rainfall, and heavy sediment deposition events were observed. The overstory tree density showed patterns of a general increase and subsequent decline, and the overstory tree biomass increased and then remained steady. The heavy rainfall and sediment deposition as disturbance events also coincided with changes in species composition and the turnover rate of the understory plant communities, causing changes in major ecological processes. The general pattern of species co-occurrence (zeta diversity) was fitted to an exponential model, indicating the dominance of stochastic processes. The results show a shift in relative importance from deterministic to stochastic processes in the successional stages of understory plant community assembly over a mid-term observational period.

中文翻译：

韩国郁陵岛阔叶林林下群落动态的驱动过程

林木发育阶段对林下植物种类影响较大；然而，很少有研究致力于深入调查中期观察期（≥10 年）内生态过程（确定性和随机性）的变化。我们分析了郁陵岛 Albongbunji 盆地 11 年间的森林地面环境，包括裸露的矿质土壤、树木群落（密度和生物量）、林下植物物种组成、多样性、覆盖度以及共生物种的变化（ 2009-2019 年）。森林地表环境呈现出广泛的变化，开始于观测期的中期和大雨之后，并观测到了大量沉积物沉积事件。上层树密度显示出普遍增加和随后下降的模式，上层乔木生物量先增加后保持稳定。作为干扰事件的强降雨和沉积物沉积也与物种组成的变化和林下植物群落的更新率同时发生，导致主要生态过程发生变化。物种共现（zeta 多样性）的一般模式符合指数模型，表明随机过程占主导地位。结果表明，在中期观察期内，林下植物群落组装的演替阶段的相对重要性从确定性过程转变为随机过程。作为干扰事件的强降雨和沉积物沉积也与物种组成的变化和林下植物群落的更新率同时发生，导致主要生态过程发生变化。物种共现（zeta 多样性）的一般模式符合指数模型，表明随机过程占主导地位。结果表明，在中期观察期内，林下植物群落组装的演替阶段的相对重要性从确定性过程转变为随机过程。作为干扰事件的强降雨和沉积物沉积也与物种组成的变化和林下植物群落的更新率同时发生，导致主要生态过程发生变化。物种共现（zeta 多样性）的一般模式符合指数模型，表明随机过程占主导地位。结果表明，在中期观察期内，林下植物群落组装的演替阶段的相对重要性从确定性过程转变为随机过程。

更新日期：2021-07-02

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