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Relative contribution of environmental and nutritional variables to net primary production of Cynodon dactylon (Linn.) Pers in the riparian zone of a Three Gorges tributary.
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-05-25 , DOI: 10.1002/ece3.6409 Junjie Lin 1 , Shuang Zhou 1 , Dan Liu 2 , Shuai Zhang 1 , Zhiguo Yu 3 , Xiaoxia Yang 4
Ecology and Evolution ( IF 2.3 ) Pub Date : 2020-05-25 , DOI: 10.1002/ece3.6409 Junjie Lin 1 , Shuang Zhou 1 , Dan Liu 2 , Shuai Zhang 1 , Zhiguo Yu 3 , Xiaoxia Yang 4
Affiliation
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Our knowledge of fundamental drivers of terrestrial net primary production (NPP) is crucial for improving the predictability of ecosystem stability under global climate change. However, the patterns and determinants of NPP are not fully understood, especially in the riparian zone ecosystem disturbed by periodic drought–rewetting (DRW) cycles. The environmental (flooding time, pH, moisture, and clay content) and nutritional properties (soil organic carbon, total nitrogen, total phosphorus, ammonium (NH4+‐N), nitrate (NO3‐‐N), and C:N:P stoichiometry) were investigated in the riparian zone of Pengxi River‐a typical tributary of Three Gorges Reservoir (TGR). Structure equation modeling was performed to evaluate the relative importance of environmental and nutritional properties on NPP of Cynodon dactylon (Linn.) Pers (C. dactylon)‐ a dominating plant in the riparian zone of TGR. Our results indicated that NPP was much lower under much severe flooding stress. All of these variables could predict 46% of the NPP variance. Nutrient use efficiency (NUE) was one of the most critical predictor shaping the change of NPP. Specifically, flooding stress as a major driver had a direct positive effect on soil moisture and soil clay content. The soil clay content positively affects the soil C: N ratio, which further had an indirect negative impact on NPP by mediating NUE. Overall, our study provided a comprehensive analysis of the effects of the combined effect of environmental and nutrient factors on NPP and showed that continuous DRW cycles induced by hydrological regime stimulate the decrease of NPP of C. dactylon by changing NUE strategies. Further research is needed to explore the responses of NPP and NUE under different land use to DRW cycles and to investigate the DRW effects on the combined effect of environmental and nutrient factors by in situ experiments and long‐term studies.
中文翻译：
环境和营养变量对三峡支流河岸带狗牙根 (Linn.) Pers 净初级生产的相对贡献。
我们对陆地净初级生产（NPP）基本驱动因素的了解对于提高全球气候变化下生态系统稳定性的可预测性至关重要。然而，NPP 的模式和决定因素尚不完全清楚，特别是在受到周期性干旱-再湿化 (DRW) 循环干扰的河岸带生态系统中。环境（淹没时间、pH、水分和粘土含量）和营养特性（土壤有机碳、总氮、总磷、铵（NH 4 + ‐N）、硝酸盐（NO 3 ‐ ‐N）和 C:N :P 化学计量) 在三峡水库 (TGR) 的典型支流蓬溪河河岸带进行了研究。采用结构方程模型来评估环境和营养特性对狗牙根 (Linn.) Pers (C. dactylon) NPP 的相对重要性，狗牙根是TGR 河岸带的主要植物。我们的结果表明，在严重的洪水胁迫下，NPP 要低得多。所有这些变量可以预测 46% 的 NPP 方差。养分利用效率（NUE）是影响NPP变化的最关键的预测因子之一。具体而言，洪水应力作为主要驱动因素对土壤湿度和土壤粘土含量具有直接的积极影响。土壤粘土含量对土壤C:N比有正向影响，进而通过调节NUE对NPP产生间接负面影响。总体而言，我们的研究综合分析了环境和营养因素对NPP的综合影响，表明水文状况诱导的连续DRW循环通过改变NUE策略刺激了狗牙根NPP的降低。 需要进一步研究不同土地利用下的NPP和NUE对DRW循环的响应，并通过原位实验和长期研究探讨DRW对环境和营养因素综合效应的影响。
更新日期：2020-07-30
中文翻译：
环境和营养变量对三峡支流河岸带狗牙根 (Linn.) Pers 净初级生产的相对贡献。
我们对陆地净初级生产（NPP）基本驱动因素的了解对于提高全球气候变化下生态系统稳定性的可预测性至关重要。然而，NPP 的模式和决定因素尚不完全清楚，特别是在受到周期性干旱-再湿化 (DRW) 循环干扰的河岸带生态系统中。环境（淹没时间、pH、水分和粘土含量）和营养特性（土壤有机碳、总氮、总磷、铵（NH 4 + ‐N）、硝酸盐（NO 3 ‐ ‐N）和 C:N :P 化学计量) 在三峡水库 (TGR) 的典型支流蓬溪河河岸带进行了研究。采用结构方程模型来评估环境和营养特性对狗牙根 (Linn.) Pers (C. dactylon) NPP 的相对重要性，狗牙根是TGR 河岸带的主要植物。我们的结果表明，在严重的洪水胁迫下，NPP 要低得多。所有这些变量可以预测 46% 的 NPP 方差。养分利用效率（NUE）是影响NPP变化的最关键的预测因子之一。具体而言，洪水应力作为主要驱动因素对土壤湿度和土壤粘土含量具有直接的积极影响。土壤粘土含量对土壤C:N比有正向影响，进而通过调节NUE对NPP产生间接负面影响。总体而言，我们的研究综合分析了环境和营养因素对NPP的综合影响，表明水文状况诱导的连续DRW循环通过改变NUE策略刺激了狗牙根NPP的降低。 需要进一步研究不同土地利用下的NPP和NUE对DRW循环的响应，并通过原位实验和长期研究探讨DRW对环境和营养因素综合效应的影响。
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