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森林碎片化严重威胁生态系统的健康,导致物种多样性、生态系统稳定性的降低。鼠类和森林种子是一类重要的互作网络,在生物多样性维持和生态系统服务功能上发挥着重要作用,有关森林斑块大小及演替阶段对鼠类—种子互作网络的影响的报道较少。本研究以都江堰地区亚热带森林鼠类—种子互作系统为例,选取15个不同大小和演替阶段的森林斑块,结合红外相机监测和种子标记,通过监测鼠类与种子的互作过程,分析了斑块大小和演替阶段对鼠类—种子互作关系的影响,并绘制了各斑块鼠类—种子互作网络图谱,发现:中斑块(2-4 hm~2)森林中鼠类的物种数最多,大斑块(9-30 hm~2)最少;演替后期(20-40 yrs)次生林的加权嵌套度(Weighted-Interaction Nestedness Estimator,WINE)显著地高于演替早期(10-20 yrs)次生林;原始林网络内相关植物的植株总数和胸径(DBH)总和都要显著大于次生林。我们的结果说明森林破碎化对鼠类—种子互作网络的加权嵌套度有一定影响,对其他网络参数影响不大,可能与其种间关系泛化度较大有关。该结果对进一步研究种间互作关系及生态网络结构与功能具有一定的参考意义。
Fragmentation of forests poses a serious threat to the health of ecosystems, leading to a decline in species diversity and ecosystem stability. Rodents and forest seeds are an important network of interactions that play an important role in biodiversity conservation and ecosystem services. The impact of the size and succession stages of forest patches on the rodent-seed interaction network Less reported. Taking the forest-seed interaction system of subtropical forest in Dujiangyan as an example, we selected 15 forest patches with different size and succession stages. By monitoring the seed and the infrared camera, The effect of plaque size and succession stage on the interaction between mouse and seed was analyzed. The map of interaction between mouse and seed in each plaque was drawn. It was found that in mid-patch (2-4 hm ~ 2) forest The number of species in rodents was the largest, with the least patches (9-30 hm ~ 2). The Weighted-Interaction Nestedness Estimator (WINE) of secondary forests in late succession (20-40 yrs) was significantly higher than that of succession Early (10-20 yrs) secondary forests; the total number of plants and the DBH of all the related plants in the primary forest network should be significantly larger than the secondary forest. Our results show that forest fragmentation has a certain impact on the weighted nested degree of the rodent-seed interaction network, and has little effect on other network parameters, which may be related to the greater degree of its inter-species relationship. The results have certain reference value for further research on the interaction between species and the structure and function of ecological networks.