Dou Yongjing, Zhang Bing, Sun Xin, Chang Liang, Wu Donghui
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China.
University of Chinese Academy of Sciences, Beijing, China.
PeerJ. 2019 Jun 27;7:e7198. doi: 10.7717/peerj.7198. eCollection 2019.
To examine the biodiversity restoration of marshlands after human-induced disturbances, a long-term chronosequence study of Collembola communities was completed that included cultivated treatment (marshes with 15 years of soybean cultivation; CU15), two restored treatments (with 6 and 12 years of agricultural abandonment; RE06 and RE12, respectively), and an intact marshland (IM) as a reference in the Sanjiang Plain, Northeastern China. Changes in the soil properties and Collembola communities under different treatments were analyzed. Soil parameters (i.e., soil organic carbon, available N, P and K, soil moisture) significantly increased from the cultivated treatment to the 6-year agricultural abandoned, and then 12-year agricultural abandoned treatment, indicating that the degraded soil began to recover after agricultural abandonment. The density, species richness and diversity of Collembola in RE12 were significantly higher than in RE06 and CU15, and even surpass the IM, indicating marshland restoration (after 12 years of agricultural abandonment) benefited recruitment and reconstruction of Collembola community. We found soil surface-dwelling Collembola recovered faster than eu-edaphic species, that is probably due to some common traits (i.e., parthenogenesis and fast dispersal) between epi- and hemi-edaphic species. The changes in the vegetation and soil properties during long-term soybean cultivation and agricultural abandonment were the key factors affecting the composition, density, and species richness of soil Collembola.
为了研究人为干扰后沼泽地的生物多样性恢复情况，我们完成了一项关于弹尾目群落的长期时间序列研究，该研究涵盖了耕作处理（种植大豆15年的沼泽地；CU15）、两种恢复处理（分别弃耕6年和12年；RE06和RE12）以及中国东北三江平原的一块完整沼泽地（IM）作为对照。分析了不同处理下土壤性质和弹尾目群落的变化。土壤参数（即土壤有机碳、有效氮、磷和钾、土壤湿度）从耕作处理到弃耕6年，再到弃耕12年的处理显著增加，这表明弃耕后退化土壤开始恢复。RE12中弹尾目的密度、物种丰富度和多样性显著高于RE06和CU15，甚至超过了IM，这表明沼泽地恢复（弃耕12年后）有利于弹尾目群落的补充和重建。我们发现土壤表层栖息的弹尾目比土壤内栖物种恢复得更快，这可能是由于表栖和半土栖物种之间的一些共同特征（即孤雌生殖和快速扩散）。长期大豆种植和弃耕期间植被和土壤性质的变化是影响土壤弹尾目组成、密度和物种丰富度的关键因素。
