Numerical exploration of the impact of hydrological connectivity on rainfed annual crops in Mediterranean hilly landscapes

IF 6.4 1区 农林科学 Q1 AGRONOMY
Mariem Dhouib, Jérôme Molénat, Laurent Prévot, Insaf Mekki, Rim Zitouna-Chebbi, Frédéric Jacob
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Abstract

Within hilly agricultural landscapes, topography induces lateral transfers of runoff water, so-called interplot hydrological connectivity. Runoff water from upstream plots can infiltrate downstream plots, thus influencing the water content in the root zone that drives crop functioning. The impact of runoff on crop functioning can be crucial for optimizing agricultural landscape management strategies. However, to our knowledge, no study has specifically focused on the impact on crop yield. The current study aims to comprehensively investigate the impact of runoff on crop functioning in the context of Mediterranean rainfed annual crops. To quantify this impact, we conduct a numerical experiment using the AquaCrop model and consider two hydrologically connected plots. The experiment explores a range of upstream and downstream agro-pedo-climatic conditions: crop type, soil texture and depth, climate forcing, and the area of the upstream plot. The experiment relies on data collected over the last 25 years in OMERE, an environment research observatory in northeastern Tunisia, and data from literature. A key finding in the results is that water supply through hydrological connectivity can enhance annual crop production under semiarid and subhumid climate conditions. Specifically, the results show that the downstream infiltration of upstream runoff has a positive impact on crop functioning in a moderate number of situations, ranging from 16% (wheat) to 33% (faba bean) as the average across above ground biomass and yield. Positive impact is mostly found for higher soil available water capacity and under semiarid and dry subhumid climate conditions, with a significant impact of rainfall intra-annual distribution in relation to crop phenology. These research needs to be expanded by considering both a wider range of crops and future climate conditions.

Abstract Image

水文连通性对地中海丘陵地带雨浇一年生作物影响的数值探索
在丘陵农业景观中,地形会引起径流水的横向转移,即所谓的地块间水文连通性。上游地块的径流水可以渗透到下游地块,从而影响根区的含水量,进而推动作物的生长。径流对作物功能的影响对于优化农业景观管理策略至关重要。然而,据我们所知,还没有研究专门关注径流对作物产量的影响。本研究旨在全面调查径流对地中海雨养一年生作物功能的影响。为了量化这种影响,我们使用 AquaCrop 模型进行了一次数值实验,并考虑了两个水文相连的地块。实验探讨了一系列上游和下游的农业-植物-气候条件:作物类型、土壤质地和深度、气候胁迫以及上游地块的面积。实验依据的是突尼斯东北部环境研究观测站 OMERE 在过去 25 年中收集的数据以及文献数据。实验结果的一个重要发现是,在半干旱和亚湿润气候条件下,通过水文连通性供水可以提高作物的年产量。具体而言,研究结果表明,上游径流的下游入渗在一定数量的情况下对作物的功能有积极影响,从 16%(小麦)到 33%(蚕豆)不等,这是地上生物量和产量的平均值。积极影响主要体现在较高的土壤可用水量以及半干旱和亚湿润干旱气候条件下,降雨量的年内分布与作物物候有很大关系。这些研究需要通过考虑更广泛的作物和未来的气候条件加以扩展。
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来源期刊
Agronomy for Sustainable Development
Agronomy for Sustainable Development 农林科学-农艺学
CiteScore
10.70
自引率
8.20%
发文量
108
审稿时长
3 months
期刊介绍: Agronomy for Sustainable Development (ASD) is a peer-reviewed scientific journal of international scope, dedicated to publishing original research articles, review articles, and meta-analyses aimed at improving sustainability in agricultural and food systems. The journal serves as a bridge between agronomy, cropping, and farming system research and various other disciplines including ecology, genetics, economics, and social sciences. ASD encourages studies in agroecology, participatory research, and interdisciplinary approaches, with a focus on systems thinking applied at different scales from field to global levels. Research articles published in ASD should present significant scientific advancements compared to existing knowledge, within an international context. Review articles should critically evaluate emerging topics, and opinion papers may also be submitted as reviews. Meta-analysis articles should provide clear contributions to resolving widely debated scientific questions.
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