Journal
FRONTIERS IN PLANT SCIENCE
Volume 12, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2021.661865
Keywords
foliar decomposition; nutrient release; hydrological regime; mixed species; riparian zone; Three Gorges Reservoir
Categories
Funding
- Chongqing Municipality Key Forestry Research Project [TD2020-2]
- Chongqing Municipality Housing and Urban Construction Committee [2019-1-4-2]
- State Cultivation Base of EcoAgriculture for Southwest Mountainous Land [5330200076]
- Forestry Extension Project of China Central Finance [2020-2]
- International Sci-Tech Cooperation Project of Ministry of Science and Technology [2015DFA90900]
- Ningxia Key Research and Development Projects [2020BFG03006]
- Ningxia Natural Science Foundation Project [2020AAC03107]
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This study found that hydrological processes promote foliage decomposition, with all foliage types decomposing fastest in shallow flooding environments. Mixed-species samples decomposed most quickly in flooded and unflooded hydrological processes, with flooding also promoting nutrient release.
Foliar decomposition has significant effects on nutrient cycling and the productivity of riparian ecosystems, but studies on the impact of related hydrological dynamics have been lacking. Here, the litterbag method was carried out to compare decomposition and nutrient release characteristics in situ, including three foliage types [two single-species treatments using Taxodium distichum (L.) Rich., Salix matsudana Koidz., or a mixture with equal proportions of leaf mass], three flooding depths (unflooded, shallow flooding, and deep flooding), two hydrodynamic processes (continuous flooding and flooded-to-unflooded hydrological processes), and one hydrological cycle (1 year) in the riparian zone of the Three Gorges Reservoir. The results showed that both hydrological processes significantly promoted foliage decomposition, and all foliage types decomposed the fastest in a shallow flooding environment (P < 0.05). The mixed-species samples decomposed most quickly in the flooded hydrological process in the first half of the year and the unflooded hydrological process in the second half of the year. Flooding also significantly promoted the release of nutrients (P < 0.05). Mixed-species samples had the fastest release rates of carbon and nutrients in the flooded hydrological process in the first half of the year and the unflooded hydrological process in the second half of the year. Foliage decomposition was also closely related to environmental factors, such as water depth, temperature, and hydrological processes. Our research clarified the material cycling and energy flow process of the riparian ecosystem in the Three Gorges Reservoir area. It also provided a new reference for further understanding of foliage decomposition and nutrient release under different hydrological environments.
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