Seasonal Water Uptake Patterns of Different Plant Functional Types in the Monsoon Evergreen Broad-Leaved Forest of Southern China

The precipitation changes induced by climate warming have substantially increased extreme and seasonal drought events. Different plant functional types (PFTs) could exert an important role in resisting climate. However, the patterns of water uptake different PFTs remain uncertain, especially under magnitudes rainfall Here, we employed a stable hydrogen isotope (δD) to determine sources PFTs, including Castanopsis chinensis canopy layer, Schima superba sublayer, Psychotria asiatica shrub Blechnum orientale on forest floor monsoon evergreen broad-leaved Dinghushan Biosphere Reserve, China. We further used two-end linear mixing model explore utilization among PFTs. Our results revealed that soil before were Furthermore, proportions utilized S. sublayer light moderate rainfalls 6.9%–59.4% 30.5%–66.3%, respectively, which significantly higher than those other species both dry wet seasons. After heavy rainfall, proportion was lowest (4.7%–26.5%), while B. had highest (31.6%–91.5%), whether or season. These findings imply would compete with one another for uptake. Especially warming, uneven distribution intensify competition species, ultimately resulting community structure becoming much more unstable before.