北京东灵山土壤动物-植物互作关系对海拔格局的响应

土壤动物可能会与植物形成复杂的互作网络，有关其对海拔梯度做出响应的研究还相对较少，了解不同生境下的生态网络为理解和预测系统的稳定性及其动态变化机制提供了新途径。于北京东灵山地区调查了沿海拔梯度凋落物层与土壤层中的土壤动物以及木本和草本植物的多样性，并通过零模型的方法对比了土壤动物-植物互作网络特征参数的标准化效应值在高-中-低三个海拔段的差异。结果显示：土壤动物的稀有类群在中海拔段多样性较高，木本植物多样性随海拔降低，而草本植物多样性则随海拔升高。各生物类群组成都随海拔距离而增加，存在明显的聚集性分布格局。植物与土壤动物之间的互作网络特征参数不仅随海拔改变，且在凋落物与土壤层之间、木本与草本植物之间存在差异。总体而言，土壤动物与木本植物互作网络的海拔变化主要与土壤动物多样性有关，而与草本的互作网络则与草本植物多样性有关。沿海拔梯度，存在土壤动物-木本植物向土壤动物-草本植物网络的适应性转变。本研究在同一海拔梯度上探讨了不同层土壤动物与植物的互作关系，对深入理解山地生态系统中各生物类群的共存机制具有重要意义。

Altitudinal pattern of soil fauna-plant interaction in Dongling Mountain, Beijing

Soil fauna may form a complex interaction network with plants, but how to respond to altitude gradients is still poorly understood. Understanding the ecological network in different habitats provides a new approach to detect and predict the stability and its dynamic change mechanism of the system. This study investigated the diversity of soil fauna in the litter and soil layer, woody and herbaceous along the altitude gradient on Dongling Mountain in Beijing, and compared the standardized effect size of soil fauna-plant interaction networks parameters in low-mid-high altitude through null-model. The results showed that the rare taxa of soil fauna had a higher diversity at mid-altitude section, the diversity of woody decreased with altitude, while the diversity of herbaceous increased. The composition of each organism increased with altitude distance, and there was a significant clustering distribution pattern. The parameters of the soil fauna-plant interaction networks not only changed with altitude, but also differed between the litter and soil layers, woody and herbaceous. In general, the altitude changes of the soil fauna-woody interaction network are mainly related to the diversity of soil fauna, while the soil fauna-herbaceous network are related to the diversity of herbaceous. There is an adaptive transition from soil fauna-woody interaction network to soil fauna-herbaceous network along the altitudinal gradient. This study explored the interaction between different layers of soil fauna and plants along the same altitude gradient, which is of great importance for further understanding of the coexistence mechanism of various taxa in mountain ecosystems.