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Open AccessArticle

Net Primary Production Predicted by the Proportion of C:N:P Stoichiometric Ratio in the Leaf-Stem and Root of Cynodon Dactylon (Linn.) in the Riparian Zone of the Three Gorges Reservoir

1
Department of Agricultural and Forestry Science and Technology, Chongqing Three Gorges Vocation College, Chongqing 404000, China
2
Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Wanzhou 404100, China
3
School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
*
Authors to whom correspondence should be addressed.
Water 2020, 12(11), 3279; https://doi.org/10.3390/w12113279
Received: 11 October 2020 / Revised: 18 November 2020 / Accepted: 19 November 2020 / Published: 22 November 2020
Net primary production (NPP) is closely related to the proportion of carbon (C), nitrogen (N) and phosphorus (P) in the leaf-stem and root of perennial herbs. However, the relationship of NPP with the C:N:P stoichiometric ratio in above- and below-ground plant tissues remains unknown under the periodic flooding stresses in the riparian zone ecosystem. In this study, the leaf-stem and root C, N, P content and biomass of Cynodon dactylon (Linn.) Pers. (C. dactylon) were investigated at the riparian zone altitudes of 145–155, 155–165, and 165–175 m above sea level (masl) of in a Three Gorges Reservoir (TGR) tributary–Pengxi River. The results showed that the NPP and biomass of C. dactylon had a similar decreasing trend with a riparian zone altitudes decrease. The root of C. dactylon showed relatively lower N and P content, but much higher N and P use efficiency with higher C:N and C:P ratio than that of a leaf-stem under N limitation conditions. NPP was positively correlated to C:N in the stem-leaf to root ratio (C:Nstem-leaf/root) and C:P ratio in the root (C:Proot ratio). Hydrological and C:N:P stoichiometric variables could predict 68% of the NPP variance, and thus could be regarded as the main predictor of NPP in the riparian zone of the TGR. View Full-Text
Keywords: Three Gorges Dam; perennial herb; N limitation; nutrition use efficiency; hydrological regime Three Gorges Dam; perennial herb; N limitation; nutrition use efficiency; hydrological regime
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MDPI and ACS Style

Liu, D.; He, L.; Yu, Z.; Liu, Z.; Lin, J. Net Primary Production Predicted by the Proportion of C:N:P Stoichiometric Ratio in the Leaf-Stem and Root of Cynodon Dactylon (Linn.) in the Riparian Zone of the Three Gorges Reservoir. Water 2020, 12, 3279. https://doi.org/10.3390/w12113279

AMA Style

Liu D, He L, Yu Z, Liu Z, Lin J. Net Primary Production Predicted by the Proportion of C:N:P Stoichiometric Ratio in the Leaf-Stem and Root of Cynodon Dactylon (Linn.) in the Riparian Zone of the Three Gorges Reservoir. Water. 2020; 12(11):3279. https://doi.org/10.3390/w12113279

Chicago/Turabian Style

Liu, Dan; He, Liping; Yu, Zhiguo; Liu, Zhengxue; Lin, Junjie. 2020. "Net Primary Production Predicted by the Proportion of C:N:P Stoichiometric Ratio in the Leaf-Stem and Root of Cynodon Dactylon (Linn.) in the Riparian Zone of the Three Gorges Reservoir" Water 12, no. 11: 3279. https://doi.org/10.3390/w12113279

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