College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou, 510642, China.
Sci Rep. 2017 Aug 25;7(1):9551. doi: 10.1038/s41598-017-09922-7.
We used geographically weighted regression to investigate the relationship between biodiversity and the spatial stability of forest productivity (SSFP) in a subtropical mountain forest. We examined the effect of elevation on this relationship and on its spatial non-stationarity. We found that higher woody plant diversity reduced SSPF. Higher woody plant diversity strengthened the asynchrony of species responses to spatial heterogeneity of forest habitats, which contributed to SSFP, but reduced two factors that enhanced SSFP: species dominance and the spatial stability of the dominant species. The percentage of variation in SSFP explained by diversity measures was highest for the Shannon-Wiener index, lowest for functional dispersion, and intermediate for species richness. The correlations of woody plant diversity with SSFP became stronger with elevation and varied among plots, indicating that the spatial non-stationarity existed in the biodiversity-SSFP relationship. These correlations became weaker in most cases after controlling for elevation. Our results suggest that in the subtropical mountain forest higher woody plant diversity has a spatially destabilising effect on forest productivity, particularly at higher elevations.
我们利用地理加权回归研究了亚热带山地森林生物多样性与森林生产力空间稳定性（SSFP）之间的关系。我们检验了海拔对这种关系及其空间非平稳性的影响。结果发现，较高的木本植物多样性降低了 SSFP。较高的木本植物多样性增强了物种对森林生境空间异质性的响应的异步性，这有助于 SSFP，但降低了增强 SSFP 的两个因素：物种优势和优势物种的空间稳定性。多样性测度解释 SSFP 变异的百分比以 Shannon-Wiener 指数最高，功能离散度最低，物种丰富度居中。木本植物多样性与 SSFP 的相关性随着海拔的升高而增强，并且在不同的样地之间存在差异，表明生物多样性与 SSFP 之间存在空间非平稳性。在控制海拔后，大多数情况下这些相关性变得较弱。我们的研究结果表明，在亚热带山地森林中，较高的木本植物多样性对森林生产力具有空间不稳定的影响，特别是在较高的海拔。
