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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 ( IF 3.4 ) Pub Date : 2020-11-22 , DOI: 10.3390/w12113279 Dan Liu , Liping He , Zhiguo Yu , Zhengxue Liu , Junjie Lin
Water ( IF 3.4 ) Pub Date : 2020-11-22 , DOI: 10.3390/w12113279 Dan Liu , Liping He , Zhiguo Yu , Zhengxue Liu , Junjie Lin
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.
中文翻译:
三峡水库河岸带狗牙根(Linn.)叶-茎和根C:N:P化学计量比预测的净初级产量
净初级生产力(NPP)与多年生草本叶茎和根中碳(C)、氮(N)和磷(P)的比例密切相关。然而,在河岸带生态系统的周期性洪水胁迫下,NPP 与地上和地下植物组织中 C:N:P 化学计量比的关系仍然未知。在这项研究中,狗牙根 (Linn.) Pers 的叶茎和根 C、N、P 含量和生物量。(C. dactylon) 在三峡水库 (TGR) 支流蓬溪河中海拔 145-155、155-165 和 165-175 m 的河岸带海拔 (masl) 进行了调查。结果表明,随着河岸带海拔高度的降低,仙人掌的NPP和生物量也有类似的下降趋势。C. dactylon 的根表现出相对较低的 N 和 P 含量,但在 N 限制条件下,N 和 P 的利用效率更高,C:N 和 C:P 比高于叶茎。NPP与茎叶根比(C:Nstem-leaf/root)中的C:N和根中的C:P比(C:Proot比)呈正相关。水文和 C:N:P 化学计量变量可以预测 68% 的 NPP 方差,因此可以被视为 TGR 河岸带 NPP 的主要预测因子。
更新日期:2020-11-22
中文翻译:
三峡水库河岸带狗牙根(Linn.)叶-茎和根C:N:P化学计量比预测的净初级产量
净初级生产力(NPP)与多年生草本叶茎和根中碳(C)、氮(N)和磷(P)的比例密切相关。然而,在河岸带生态系统的周期性洪水胁迫下,NPP 与地上和地下植物组织中 C:N:P 化学计量比的关系仍然未知。在这项研究中,狗牙根 (Linn.) Pers 的叶茎和根 C、N、P 含量和生物量。(C. dactylon) 在三峡水库 (TGR) 支流蓬溪河中海拔 145-155、155-165 和 165-175 m 的河岸带海拔 (masl) 进行了调查。结果表明,随着河岸带海拔高度的降低,仙人掌的NPP和生物量也有类似的下降趋势。C. dactylon 的根表现出相对较低的 N 和 P 含量,但在 N 限制条件下,N 和 P 的利用效率更高,C:N 和 C:P 比高于叶茎。NPP与茎叶根比(C:Nstem-leaf/root)中的C:N和根中的C:P比(C:Proot比)呈正相关。水文和 C:N:P 化学计量变量可以预测 68% 的 NPP 方差,因此可以被视为 TGR 河岸带 NPP 的主要预测因子。