Seasonal dynamics of the plant community and soil seed bank along a successional gradient in a subalpine meadow on the Tibetan Plateau.
Seasonal dynamics of the plant community and soil seed bank along a successional gradient in a subalpine meadow on the Tibetan Plateau.
复制标题
青藏高原亚高山草甸沿演替梯度的植物群落和土壤种子库的季节动态。
DOI：
10.1371/journal.pone.0080220
复制
发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Du G
中科院分区：
文献类型：
--
作者：
Ma M;Zhou X;Qi W;Liu K;Jia P;Du G
了解土壤种子库在植被演替过程中的重要性变化以及种子量与种子丰度的关系，对于理解植被动态具有重要意义。虽然已经进行了许多研究，但它们的群落聚集的生态机制还没有完全了解。我们研究了植被和土壤种子库的季节动态以及种子大小分布沿着演替梯度。我们还探讨了土壤种子库在植物群落再生中的潜在作用，种子质量和物种丰富度之间的关系，以及确定性和随机过程沿沿着演替梯度的相对重要性。随着演替的进行，种子库物种丰富度（浅层和总）显著增加，种子密度（各层和总）显著降低。物种丰富度和种子密度在不同季节和不同土壤深度间差异显著。在演替初期，种子质量与相对多度呈显著负相关，而在演替后期，二者的相关性不显著。在整个演替序列中，种子库中种子量与相对多度之间没有明显的相关性。2005年7月和2006年4月的结果相似。种子质量和丰度的关系是由一个复杂的相互作用，小和大的种子物种和环境因素。随机过程和确定性过程都是最早阶段结构的重要决定因素。种子库的重要性随着演替的进行而降低。利用土壤种子库可以成功地将废弃的农牧交错带恢复为物种丰富的亚高山草甸。然而，至少需要20年才能将废弃的农业草甸完全恢复为自然成熟的亚高山草甸。
Knowledge about how change the importance of soil seed bank and relationship between seed mass and abundance during vegetation succession is crucial for understanding vegetation dynamics. Many studies have been conducted, but their ecological mechanisms of community assembly are not fully understood. We examined the seasonal dynamics of the vegetation and soil seed bank as well as seed size distribution along a successional gradient. We also explored the potential role of the soil seed bank in plant community regeneration, the relationship between seed mass and species abundance, and the relative importance of deterministic and stochastic processes along a successional gradient. Species richness of seed bank increased (shallow layer and the total) and seed density decreased (each layer and the total) significantly with succession. Species richness and seed density differed significantly between different seasons and among soil depths. Seed mass showed a significant negative relationship with relative abundance in the earliest successional stage, but the relationships were not significant in later stages. Seed mass showed no relationship with relative abundance in the whole successional series in seed bank. Results were similar for both July 2005 and April 2006. The seed mass and abundance relationship was determined by a complex interaction between small and larger seeded species and environmental factors. Both stochastic processes and deterministic processes were important determinants of the structure of the earliest stage. The importance of seed bank decreased with succession. The restoration of abandoned farmed and grazed meadows to the species-rich subalpine meadow in Tibetan Plateau can be successfully achieved from the soil seed bank. However, at least 20 years are required to fully restore an abandoned agricultural meadow to a natural mature subalpine meadow.
登录
查看更多内容
影响因子：
8.8
作者：
Gravel, D;Canham, CD;Messier, C
通讯作者：
Messier, C
影响因子：
3.4
作者：
Caballero, Idoia;Olano, Jose M.;Escudero, Adrian
通讯作者：
Escudero, Adrian
影响因子：
5.5
作者：
Moles, AT;Westoby, M
通讯作者：
Westoby, M
影响因子：
2.7
作者：
Eriksson, O
通讯作者：
Eriksson, O
影响因子：
3.4
作者：
Mabry, CM
通讯作者：
Mabry, CM