Effects of water level on three wetlands soil seed banks on the Tibetan Plateau.
Effects of water level on three wetlands soil seed banks on the Tibetan Plateau.
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DOI：
10.1371/journal.pone.0101458
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发表时间：
2014
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;Ma Z;Du G
虽然在许多生态系统中水位对土壤种子库萌发的影响已被记录，但其机制尚未完全了解，迄今为止还没有关于这一主题的实证研究。此外，还没有研究水位对青藏高原高寒干旱盐碱湿地种子库的影响。研究了不同水位（0 cm、5 cm和10 cm）对典型、干旱和盐碱湿地0 - 5 cm和5 - 10 cm土壤种子库种子萌发和成苗的影响。我们还探讨了土壤种子库在干旱和盐碱湿地恢复中的潜在作用。物种丰富度随水位升高而降低，但种子密度变化不大。3种湿地种子库的物种组成在不同水位之间存在较大差异，尤其是在0~5cm和0~10cm之间。0 cm水位处，干旱湿地种子库与植物群落物种组成的相似性高于其他两个湿地。3种湿地在0 cm水位下的相似性明显高于5 cm和10 cm水位下。干旱和盐渍化后高寒湿地植物群落的物种组成发生了显著变化，但种子库的物种组成没有发生变化。水位对种子库的补充和植物群落的建立有重要影响。此外，恢复生境中的不同水位可能决定其植物群落的物种组成。种子库在退化湿地恢复中具有重要作用。干旱和盐碱化湿地的成功恢复取决于种子库。
Although the effect of water level on germination in soil seed banks has been documented in many ecosystems, the mechanism is not fully understood, and to date no empirical studies on this subject exist. Further, no work has been done on the effect of water level on seed banks of drying and saline-alkaline wetlands in alpine areas on the Tibetan Plateau. We examined the effects of water level (0 cm, 5 cm and 10 cm) on seed germination and seedling establishment from soil seed banks at 0–5 cm and 5–10 cm depths in typical, drying, and saline-alkaline wetlands. We also explore the potential role of soil seed bank in restoration of drying and saline-alkaline wetlands. Species richness decreased with increase in water level, but there almost no change in seed density. A huge difference exists in species composition of the seed bank among different water levels in all three wetlands, especially between 0 cm and 5 cm and 0 cm and 10 cm. Similarity of species composition between seed bank and plant community was higher in 0 cm water level in drying wetland than in the other two wetlands. The similarity was much higher in 0 cm water level than in 5 cm and 10 cm water levels in all three wetlands. Species composition of the alpine wetland plant community changed significantly after drying and salinization, however, species composition of the seed bank was unchanged regardless of the environment change. Water level greatly affects seed bank recruitment and plant community establishment. Further, different water levels in restored habitats are likely to determine its species composition of the plant community. The seed bank is important in restoration of degraded wetlands. Successful restoration of drying and salinization wetlands could depend on the seed bank.
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影响因子：
1.7
作者：
Nicol, JM;Ganf, GG;Pelton, GA
通讯作者：
Pelton, GA
影响因子：
1.8
作者：
Liu, GH;Zhou, J;Cheng, Y
通讯作者：
Cheng, Y
影响因子：
3.2
作者：
Smith, SM;McCormick, PV;Garrett, PB
通讯作者：
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影响因子：
3.7
作者：
Ma M;Zhou X;Qi W;Liu K;Jia P;Du G
通讯作者：
Du G
影响因子：
1.7
作者：
Casanova, MT;Brock, MA
通讯作者：
Brock, MA