首页|Stoichiometric characteristics and homeostasis of leaf nitrogen and phosphorus responding to different water surface elevations in hydro-fluctuation zone of the Three Gorges Reservoir
Stoichiometric characteristics and homeostasis of leaf nitrogen and phosphorus responding to different water surface elevations in hydro-fluctuation zone of the Three Gorges Reservoir
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Springer Nature
As a type of wetland ecosystem with off-season 30 m water level fluctuation, the huge changes in the ecological environment, plant species, and vegetation dynamics in the hydro-fluctuation zone of the Three Gorges Reservoir (TGR) area have attracted a wide range of attention. In this present study, six typical locations in the water level fluctuating zone were used as the research objects, and the effects of different water surface elevations on the stoichiometric characteristics and homeostasis of leaf nitrogen and phosphorus were studied through a sample survey method. Results revealed that leaf nitrogen content was linearly correlated with leaf phosphorus content along water surface elevation. And water surface elevation significantly affected the nitrogen and phosphorus content of dominant plants. Four dominant species [Cynodon dactylon (Linn.) Pers, Xanthium sibiricum Partin ex Wider, Abutilon theophrasti Medik, and Bidens pilosa Linn] exhibited specific differences in the phosphorus steady state index (H_p) and nitrogen steady state index (H_N). Although belonging to different categories, both H_p and H_N of four dominant species were in the same order: X. sibiricum＞ A. theophrasti＞ C. dactylon＞ B. Pilosa. The interspecific differences in H_N and H_p indicated that there were differences in the characteristics of nutrient utilization of dominant species and their adaption to water surface elevation. Furthermore, as the elevation increases, the community coverage increased and the community stability index also increased. This might indicate that in the fluctuating zone habitat, the plant's nitrogen and phosphorus utilization strategy affects the distribution and composition of plant community along water surface elevation, and ultimately affects the stoichiometric homeostasis on the community levels.
Nitrogen and phosphorus stoichiometryStoichiometric homeostasisHydro-fluctuation zoneThree Gorges Reservoir Area
Heyun Wang、Tong Sun、Ying Liu、Wei Liu、Henglin Xiao
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Key Laboratory of Ecological Remediation of River-Lakes and Algal Utilization of Hubei Province, Innovation Demonstration Base of Ecological Environment Geotechnical and Ecological Restoration of Rivers and Lakes, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, People's Republic of China
NETL
NSTL
Springer Nature
