The effects of the reverse seasonal flooding on soil texture within the hydro-fluctuation belt in the Three Gorges reservoir, China

Wang, Yajing; Chen, Fangqing; Zhang, Miao; Chen, Shaohua; Tan, Xiangqian; Li, Meng; Hu, Zhihua

doi:10.1007/s11368-017-1725-1

Cited by 26 publications

(17 citation statements)

References 19 publications

(23 reference statements)

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“…Responses in branch and leaf functional traits to the water level gradient Water level uctuations are important ecological processes that in uence the ecosystem in water leveluctuating regions (Matthew et al, 2019). Under the in uence of water level uctuations, the ecological environment at the water level-uctuating region exhibits clear spatial heterogeneity, where environmental factors including emergence period, emergence time and soil water content are signi cantly different across the water level conditions (Wang et al, 2018). Caused by the environmental heterogeneity, branch and leaf growth traits of riparian plants also exhibit spatial variations across the water level conditions (Spencer et al, 2004;McCoy-Sulentic et al, 2017;Duan et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…When the water level gradually decreased in early September, M. laxi ora plants emerged and quickly restored their vegetative growth, and then began to ower and set fruits within a week (Chen and Xie, 2009). After the construction of the Three Gorges-Gezhou Dam cascade hydropower station, because human regulation on river discharge is conducted to ful ll the needs of ood prevention and power generation, the water level uctuation pattern in the habitat of M. laxi ora remnant populations was signi cantly altered: the emergence time of habitats is delayed, average periods of emergence was shortened from 220 days to 190 days; the ooding retreat rapidly during the growth restart period; also, and the water level in the winter dry season dramatically decreased (Wang et al, 2018;Duan et al, 2016;Sun et al, 2007). We investigated the branch and leaf growth traits in populations across a water level condition during the growth restart period after emergence to understand the pattern of branch and leaf growth traits changing with water level gradient and the phenotypic plasticity.…”

Section: Introductionmentioning

confidence: 99%

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Branches and Leaves Growth Patterns in Myricaria laxiflora Remnant Populations Are Affected by Human-altered Water Level Fluctuations

Guan

Chen²,

Zhou

et al. 2020

Preprint

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Background: The construction of the Three Gorges-Gezhou Dam altered the water level fluctuation pattern in the downstream habitat of the endangered species Myricaria laxiflora. This study investigated how branch and leaf growth traits of M. laxiflora remnant populations changed to adapt the environmental stress caused by human-altered water level fluctuations.Results:Due to such disturbance, branch and leaf growth traits of M. laxiflora populations exhibited significant differences across water level conditions. The number of secondary branches, plant height, and leaf number of the plants in the upper area of the habitat were significantly higher than that in the middle and lower river bank areas. The longest secondary branch length of the plants in the upper and middle region was significantly higher than that in the lower region. The branch and leaf volume of plants in the middle region was significantly higher than that in the upper and lower region. The maximum water content of plants in the middle and lower region was significantly higher than that in the upper region. Principal component analysis showed that the branch and leaf traits of plants changed with decreasing water level toward to decreasing plant height, leaf number and the number of secondary branches, and increasing maximum water content of branch and leaves. Conclusions: The phenotypic plasticity of M. laxiflora plants in branch and leaf growth traits alleviates the impacts of human-regulated water level fluctuations. However, the above ground growth of M. laxiflora plants distributed at the middle and lower areas of the fluctuation zone is still negatively affected.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Branches and Leaves Growth Patterns in Myricaria laxiflora Remnant Populations Are Affected by Human-altered Water Level Fluctuations

Guan

Chen²,

Zhou

et al. 2020

Preprint

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“…Remnant M. laxiflora populations exist between 41 and 46 m altitude. The soil type of this site is Haplic Alisol (depth, 30–40 cm), the soil organic matter content ranged 10.0–16.0%, and the soil bulk density and porosity ranged 35.52–61.81% and 1.05–1.81 g cm −3 , respectively (Chen, Guan, et al, ; Chen, Wu, et al, ; Chen & Xie, ; Wang et al, ).…”

Section: Methodsmentioning

confidence: 99%

Effects of soil water conditions on seedling regeneration in Myricaria laxiflora remnant populations

Guan

Chen

et al. 2020

Ecological Research

Self Cite

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Remnant populations of Myricaria laxiflora are degrading due to difficulties in regeneration. To uncover the critical factors that hinder the regeneration of M. laxiflora populations, the present study examined seed persistence, seed germination and seedling survival and growth under different soil water contents and groundwater levels. Results revealed that seed viability significantly decreased with prolonged storage time. The germination rate of seeds stored for 15 days was 10.9%, which was 79.8% lower than unstored seeds. The viability of seeds was also significantly influenced by soil water content. The germination rate under the 0 g g −1 soil water content treatment was 105.3% higher than 0.10 g g −1 soil water content. Groundwater level significantly affected seed germination and seedling growth. The suitable groundwater level for seed germination and seedling growth was between −10 and −15 cm, at which, the germination rate, seedling survival rate and seedling biomass reached their highest values. Compared to the 0 and −20 cm groundwater levels, the −10 cm level resulted in a 16.8% and 166.7% higher germination rate, 14.1% and 9.2% higher seedling survival rate and 116.7% and 82.0% higher aboveground biomass, respectively. The longest main roots were observed at the −15 cm groundwater level. Therefore, it was concluded that changes in soil water content and groundwater level affect the regeneration of remnant M. laxiflora populations. K E Y W O R D Sgroundwater level, Myricaria laxiflora, seed germination, seed viability, seedling survival and growth

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“…Water submergence can also reduce the input of fresh OC from plant litter and root exudates because of less oxygen availability for plant roots 35 . Meanwhile, enzyme activities could be indirectly affected by soil pH and microclimates under large hydroelectric project 1,5,36 . For instance, Amendola et al 5 have found that increase in soil moisture results in higher enzyme activities, with soil becoming dry condition, the substrate diffusion and oxygen content can limit enzyme activities.…”

mentioning

confidence: 99%

“…Since the completion of the Three Gorges Dam in 2008, a total area of 350 km 2 water level fluctuation zone has been formed in the Three Gorges Reservoir with water level fluctuation from 145 m above sea level in summer (May to September) to 175 m in winter (October to April) 1,38 . The reversal of submergence time and prolonged inundation dramatically lead to change in soil moisture, pH and vegetation types 32,34 , and these changes ultimately affect soil C cycling and enzyme activities.…”

mentioning

confidence: 99%

Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

Zhang

Yang

et al. 2020

Sci Rep

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The effect of flooding on soil enzyme activities and soil organic carbon (SOC) dynamics remains a widely debated topic. Here, we investigated spatial variations in C-hydrolyzing enzyme activities, soil C contents in different fractions [i.e. labile and recalcitrant carbon (LC and RC)] from 6 sites with four different elevations at two soil depths (0-10 cm and 10-30 cm) in riparian zones of the Three Gorges Reservoir, China. At region scales, the SOC, RC contents, and RC/SOC (RIC) generally showed decreasing tendency from the upstream to the downstream. The C-hydrolyzing enzyme activities were higher in the midstream compared to other sites, which did not correspond well with the changing trend of SOC content, but matched with the spatial variation in LC content. At ecosystem scales, the RC and RIC declined with decreased elevations, but the LC showed opposite trend. Whereas, the four C-hydrolyzing enzyme activities and the specific enzyme activities were corresponded well with the changing trend of Lc content. Soil c contents and enzyme activities were generally higher in top soil than deep soil across sites and elevation zones. These results reveal that the LC is the tightest factor in regulating C-hydrolyzing enzyme activities, whereas the soil C quality (i.e. RIC) and flooding collectively drive C-hydrolyzing enzyme activities possibly by affecting decomposition rates of SOC in the riparian zones. Anthropogenic activities such as large hydroelectric project can directly affect ecosystem processes and function by altering vegetation types, soil properties and hydrology 1,2 , and ultimately modify soil carbon (C) and nitrogen (N) cycling 3-5. Soil organic carbon (SOC), one of the largest and most susceptible C pools of the earth surface ecosystem, can act either as source or sink for C primarily counting on multiple factors including human activities 6-10. It is well known that the SOC pool is generally determined by the balance between litter C input and decomposition 7,11 , while the SOC decomposition process is predominantly catalyzed by a variety of extracellular enzymes 12-14. Particularly, these enzymes can hydrolyze substrates and catalyze important transformations involving in soil organic matter (SOM) synthesis 15,16. Although some studies have evaluated changes in soil C and N dynamics under large hydroelectric project 3,4,17 , how spatial variations in SOC dynamics link to C-hydrolyzing enzyme activities at region and/or ecosystem scales under large hydroelectric project remains largely unclear. The linkages between SOC and C-hydrolyzing enzyme activities can be influenced primarily by altering vegetation types under large hydroelectric projects 2,3,18,19. Most SOC exclusively originates from plant residues on site, and hence alterations in vegetation type are expected to change the quality and quantity of SOC, which in turn can affect C-hydrolyzing enzyme activities 20-23. For instance, previous studies have reported that soil hydrolytic enzyme activities are tightly related to SOC content 12,23,24 ,...

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The effects of the reverse seasonal flooding on soil texture within the hydro-fluctuation belt in the Three Gorges reservoir, China

Cited by 26 publications

References 19 publications

Branches and Leaves Growth Patterns in Myricaria laxiflora Remnant Populations Are Affected by Human-altered Water Level Fluctuations

Branches and Leaves Growth Patterns in Myricaria laxiflora Remnant Populations Are Affected by Human-altered Water Level Fluctuations

Effects of soil water conditions on seedling regeneration in Myricaria laxiflora remnant populations

Linkages between soil organic carbon fractions and carbon-hydrolyzing enzyme activities across riparian zones in the Three Gorges of China

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