Wetland drying indirectly influences plant community and seed bank diversity through soil pH.
Wetland drying indirectly influences plant community and seed bank diversity through soil pH.
复制标题
湿地干燥通过土壤 pH 值间接影响植物群落和种子库多样性。
DOI：
10.1016/j.ecolind.2017.05.027
复制
发表时间：
2017
影响因子：
6.9
通讯作者：
Guozhen Du
中科院分区：
文献类型：
--
作者：
Miaojun Ma;Carol C. Baskin;Kailiang Yu;Zhen Ma;Guozhen Du
然而，关于土壤湿度对湿地种子库的影响，以及不同土壤湿度水平湿地种子库在干燥湿地再生中的潜力等方面的研究尚不明确。我们沿着土壤湿度梯度调查了种子库和植物群落。采用结构方程模型分析了土壤湿度对种子库的直接和间接影响，以及植物群落与种子库的关系。土壤湿度对种子库丰富度和密度没有直接影响，通过植物群落对种子库产生间接影响，但通过土壤ph对种子库产生间接影响。土壤湿度对植物群落丰富度也没有直接影响，但通过土壤ph产生间接影响。植物群落组成随土壤湿度而变化，但地上植物丰度和种子库组成没有变化。各湿地植物群落与种子库相似性均较低，相似性沿湿度梯度减小。土壤pH是决定植物群落多样性的关键因素，而种子库多样性主要受土壤pH和湿地干燥条件下植物群落多样性的影响。虽然种子库对植物群落再生的潜力随着土壤湿度的增加而降低，但排水湿地仍有足够的剩余种子来成功恢复物种丰富的高寒草甸。
High altitude wetlands on the Tibetan Plateau have been shrinking due to anthropogenic disturbances and global climate change. However, the few studies that have been conducted on wetlands are inconclusive about the effect of soil moisture on seed banks and potential of seed banks in wetlands with different levels of soil moisture for regeneration of dried wetlands. We investigated seed banks and plant communities along a soil moisture gradient. A structural equation model was used to analyze the direct and indirect effects of soil moisture on seed banks, as well as the relationship between plant communities and seed banks. Although soil moisture had no direct effects on seed bank richness and density and indirect effects on seed banks through plant community, it had indirect effects on the seed bank through soil pH. Soil moisture also did not have direct effects on plant community richness, but it had indirect effects through soil pH. Plant community composition changed with soil moisture, but aboveground plant abundance and seed banks composition did not change. Low similarity exists between plant community and seed banks for all wetlands, and similarity decreased along the moisture gradient. The key factor determining plant community diversity was soil pH, while seed bank diversity was mainly affected by soil pH and plant community diversity with wetland drying. Although potential for regenerating the plant community from the seed bank decreased with an increase in soil moisture, drained wetlands still have enough residual seeds for successful restoration of species-rich alpine meadows.