Patterns of local species richness and their associations with functional traits in a 60-ha tropical forest dynamics plot
Patterns of local species richness and their associations with functional traits in a 60-ha tropical forest dynamics plot
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60 公顷热带森林动态图中当地物种丰富度的模式及其与功能性状的关联
DOI：
10.1002/ecs2.2617
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发表时间：
2019
期刊：
影响因子：
2.7
通讯作者：
Zang Runguo
中科院分区：
文献类型：
--
作者：
Zang Lipeng;Xu Han;Lin Mingxian;Zang Runguo
对生态学家来说，理解热带生物多样性维持的潜在机制仍然是一项挑战。为了从植物视角揭示潜在的机制，我们研究了热带山地雨林中当地物种丰富度的模式，该模式被定义为不同半径圆圈内目标物种个体周围的物种数量及其与主要植物功能性状的相关性。2012年，我们在海南岛的热带山地雨林建立了一个60公顷的森林动态样地，中国。2013年，我们测量了FDP中所有树种的8个功能性状(比叶面积[SLA]、叶干物质含量[LDMC]、木材密度、潜在最大高度、叶碳含量[LCC]、叶氮含量[LNC]、叶磷含量[LPC]和叶钾含量)。基于所有胸径为≥10 cm的作图个体，我们利用个体种-面积关系函数(ISARS(R))结合异质性泊松零模型来量化1-50 mm尺度上的局部物种丰富度格局，并用回归分析确定哪些功能性状会影响局部多样性格局。结果表明，123个物种的ISARs(R)曲线比较相似，没有物种的ISARs(R)曲线的平均值高于或低于所有物种的平均值。以蓄积、驱避和中性为主的物种比例分别为42.23%、13.82%和43.9%。但在Scale≥30米处，超过70%的物种表现中立，这表明当邻里之间相隔30米时，可能会发生促进性互动。在所测量的8个性状中，SLA、LNC和LPC与当地物种丰富度呈负相关。我们的研究结果表明：(1)群落结构不受关键物种控制；(2)促进性相互作用在局部多样性维持中起着重要作用；(3)在海南岛热带山地雨林中，功能性状特征保守的物种更有可能具有较高的局部物种丰富度，中国。
Understanding the underlying mechanisms of diversity maintenance in tropics remains a challenge for ecologists. To reveal the underlying mechanism from a plant‐eye‐view perspective, we examined the patterns of local species richness which was defined as the number of species around individuals of a target species within circles of different radii and their correlations with major plant functional traits in a tropical montane rainforest. In 2012, we established a 60‐ha forest dynamics plot (FDP) in tropical montane rainforest on Hainan Island, China. In 2013, we measured eight functional traits (specific leaf area [SLA], leaf dry matter content [LDMC], wood density, potential maximum height, leaf carbon content [LCC], leaf nitrogen content [LNC], leaf phosphorus content [LPC], and leaf potassium content) of all the species in the FDP. Based on all the mapped individuals that had a diameter at breast height ≥10 cm, we utilized individual species–area relationships function (ISARs(r)) combined with the heterogeneous Poisson null model to quantify the patterns of local species richness at scales from 1 to 50 m. Regression analysis was used to determine which functional traits could influence the local diversity pattern. Results showed that the 123 ISARs(r) curves were relatively similar and no species seemed to be extremely higher or lower than the average of all the ISARs(r) curves. The percentage of species that behaved predominantly as accumulators or repellers or neutrally was 42.23%, 13.82%, and 43.9% at scale of <30 m, respectively. But at scales ≥30 m, more than 70% of all species behaved neutrally suggesting that facilitative interactions probably occurred when neighborhoods were <30 m apart. Among the eight measured traits, the SLA, LNC, and LPC were negatively associated with local species richness. Our results indicated that (1) the spatial community structure was not controlled by key species; (2) facilitative interactions played an important role in local diversity maintenance; (3) species with conservative functional trait syndromes were more likely to have relatively high local species richness in the tropical montane rainforest on Hainan Island, China.