Fog drip and its relation to groundwater in the tropical seasonal rain forest of Xishuangbanna, Southwest China: a preliminary study

Liu, Wen Jie; Zhang, Yi Ping; Li, Hong Mei; Liu, Yu Hong

doi:10.1016/j.watres.2004.12.002

Cited by 51 publications

(61 citation statements)

References 25 publications

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“…Our analysis points to a similar pattern of D‐excess decline (Figure ), suggesting that Galápagos experienced a similar change in regional transport mechanisms. Similar shifts to lower D‐excess with heavier precipitation have been found during monsoonal rains in southwest China (Liu, Zhang, Li, & Liu, ), synoptically generated storms in Hawaii (Scholl et al, ; Scholl, Gingerich, & Tribble, ), and numerous tropical island stations due to rainout in the wet season/with the shift of the ITCZ (Rozanski et al, ). Thus, in Galápagos, it is likely that seasonal changes in moisture source region were caused by a combination of the El Niño event and the interannual migration of the ITCZ.…”

Section: Discussionsupporting

confidence: 56%

The role of fog, orography, and seasonality on precipitation in a semiarid, tropical island

Schmitt

Riveros-Iregui

2018

Hydrological Processes

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Isotopes of water (2H/1H and 18O/16O) are commonly used to trace hydrological processes such as moisture recycling, evaporation loss, and moisture source region and often vary temporally in a given region. This study provides a first‐ever characterization of temporally variable precipitation mechanisms of San Cristóbal Island, Galápagos. We collected fog, rain, and throughfall samples over three field seasons to understand the mechanisms driving seasonal‐ and event‐based variability in the isotopic composition of precipitation in Galápagos. We establish that fog is a common phenomenon in San Cristóbal, especially during the dry season, and we found that fog, compared with cocollected rainfall, is consistently enriched. We further suggest that the relative contribution of fog formed via different mechanisms (orographic, advective, radiation) varied seasonally. We found that the source region is the most dominant control of the isotopic composition of rainfall in the Galápagos at both the seasonal and event scales, but subcloud evaporative processes (the nontraditional manifestation of the amount effect) became a dominant control on the isotopic composition of rainfall during the dry season. Overall, our findings suggest that understanding seasonally variable water‐generating mechanisms is required for effective water resource management in San Cristóbal Island and other semiarid island ecosystems under current and future regimes of climate change.

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Section: Discussionsupporting

confidence: 56%

The role of fog, orography, and seasonality on precipitation in a semiarid, tropical island

Schmitt

Riveros-Iregui

2018

Hydrological Processes

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“…This suggests that vertical partitioning of soil water sources would occur during the peak of the dry season. Xylem water samples deviated to the right of the local meteoric water line ( δ D = 7.96 and δ 18 O + 8.67; Liu et al ., ) (Figure ), suggesting utilization of water sources subject to evaporative isotopic enrichment (Ehleringer et al ., ; Williams and Ehleringer, ). The adult trees with the least isotopically enriched stem water exhibited δ D and δ 18 O values that closely matched the limestone bedrock water.…”

Section: Resultsmentioning

confidence: 99%

Dry‐season water utilization by trees growing on thin karst soils in a seasonal tropical rainforest of Xishuangbanna, Southwest China

Liu

Duan

et al. 2013

Ecohydrology

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Stable isotopes were used to evaluate water utilization for three tree species (Cleistanthus sumatranus, Lasiococca comberi var. pseudoverticillata and Celtis wightii) growing on karst soils in the seasonal tropical rainforest of Xishuangbanna, Southwest China. The soil on the site is only 40 cm thick but was underlain by thick limestone bedrock with large water storage capacity. Dense radiational fog occurred frequently during the pronounced dry season. Isotope composition of water in xylem, soil and fog were analysed, and soil and stem porous water content were measured concurrently to determine the proportion of water deriving from fog, soil and bedrock by adult trees and seedlings at the peak of the dry season. Results indicated that C. wightii seedlings suffered stronger water stress and greatly relied on available moisture from fog (23.8% on average). This suggests that fog water was an important source for seedling growth during the pronounced dry season. In contrast, adult trees had little or negligible water uptake from fog moisture (3–7% on average) but derived around 63–85% of their water from bedrock sources. Water held within bedrock was essential for meeting plant transpiration requirements over the dry season drought. Copyright © 2013 John Wiley & Sons, Ltd.

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“…2009; Fajardo & Mclntire 2011). However, this phenomena is unlikely to occur at our study site, where plants experience only moderate drought stress, due in part to fog water that serves as an important source of moisture (Liu et al. 2004, 2005) and can be used by seedlings in the dry season (Liu et al.…”

Section: Discussionmentioning

confidence: 99%

Seasonal differentiation in density‐dependent seedling survival in a tropical rain forest

et al. 2012

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ummary 1. Density-dependent survival is prevalent in tropical forests and is recognized as a potentially important mechanism for maintaining tree species diversity. However, there is little knowledge of how density dependence changes in fluctuating environments. 2. Across the 20-ha Xishuangbanna tropical seasonal rain forest dynamics plot in southwest China, which has distinct dry and wet seasons, we monitored seedling survival in 453 1-m 2 quadrats over 2 years. Density dependence was assessed using generalized linear mixed models with crossed random effects.3. When pooling all species at the community level, there were strong negative effects of conspecific tree neighbours on seedling survival over the dry-season, wet-season and 2-year intervals. The proportion of conspecific seedling neighbours had a significant negative effect in the dry season, but not in the wet season. 4. At the species level, the effects of conspecific tree and seedling neighbours varied widely among species in the community and were significantly positively related to population basal area in the community over the dry-season interval. In contrast, over the wet-season interval, the effects of conspecific tree and seedling neighbours did not significantly vary among species in the community.Overall community-and species-level results suggest that local-scale negative density dependence (NDD) tends to be stronger in the dry than wet season in the Xishuangbanna tropical forest. 5. At the scale of the 20-ha plot, we found a community compensatory trend (CCT), in which rare species had relatively higher seedling survival than common species in both the wet and dry seasons. A positive association between potential NDD and population basal area suggests that the CCT results from local-scale NDD, specifically because of negative effects of conspecific tree neighbours. 6. Synthesis. Our results demonstrate that the strength of density-dependent seedling survival can vary between seasons and among species in tropical forests. Future research is needed to assess the underlying mechanisms of this temporal and interspecific variation in NDD and its consequences for species coexistence and community composition.

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Fog drip and its relation to groundwater in the tropical seasonal rain forest of Xishuangbanna, Southwest China: a preliminary study

Cited by 51 publications

References 25 publications

The role of fog, orography, and seasonality on precipitation in a semiarid, tropical island

The role of fog, orography, and seasonality on precipitation in a semiarid, tropical island

Dry‐season water utilization by trees growing on thin karst soils in a seasonal tropical rainforest of Xishuangbanna, Southwest China

Seasonal differentiation in density‐dependent seedling survival in a tropical rain forest

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