Enhanced nitrogen imbalances in agroecosystems driven by changing cropping systems in a coastal area of eastern China: from field to watershed scale

Li, Yanqiang; Wang, Fang; Yan, Weijin; Lv, Shucong; Li, Qingqian; Yu, Qibiao; Wang, Jun

doi:10.1039/c9em00219g

Cited by 3 publications

(13 citation statements)

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“…The NO 3 − runoff yield has been found to considerably contribute to the DIN pool from W‐M, as NH 4 + is easily adsorbed on the surface of soil minerals and organic matter (Rosenfeld, 1979; Wang, Chen, et al, 2019). However, NH 4 + was the dominant N form in the DIN lost from V‐V, and its yield was approximately double that of NO 3 − (Table S5); similar patterns have been reported in other studies of DIN loss from vegetable fields (Li et al, 2006, 2019). PO 4 3− was the dominant form of dissolved P in the runoff, and it accounted for 82.8%, 61.3% and 50.7% of total TDP runoff yields from W‐M, V‐M and V‐V, respectively (Table S5).…”

Section: Resultssupporting

confidence: 86%

“…Large amounts of N and P in coastal areas are reported to be primarily derived from agricultural activities (Huang et al, 2017; Lheureux et al, 2023; Li et al, 2019); it is therefore critical to identify the driving forces behind agricultural activities that affect nutrient losses from agricultural fields to the coast. Studies have suggested that the oversupply of chemical and organic fertilizers enhances nutrient runoff losses to coastal areas (An et al, 2022; Laurent et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

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Cropping system shifts enhanced nutrient yields under changing daily hydrological processes in a coastal watershed of Eastern China

Zhang

Yan

et al. 2023

Hydrological Processes

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Agricultural cropping systems in coastal areas of China have experienced significant shifts, and nitrogen (N) and phosphorus (P) losses via surface runoff from fields have considerably increased. However, it is unclear how changes in cropping systems coupled with rainfall-runoff affect nutrient losses in coastal areas. In this study, in-situ daily rainfall-runoff events in agricultural fields in the Dagu River watershed (a coastal area of Shandong Province, Southeastern China) were observed and the dissolved nutrient losses measured. The fields comprised three cropping systems-wheat-maize rotation (W-M), vegetable-maize rotation (V-M) and vegetable-vegetable rotation (V-V). The runoff yields of total dissolved nitrogen (TDN) and total dissolved phosphorus (TDP) in V-V (10.4 ± 0.8 kg N ha À1 year À1 and 3.90 ± 0.1 kg P ha À1 year À1 ) and V-M (6.52 ± 0.31 kg N ha À1 yr À1 and 2.12 ± 0.08 kg P ha À1 year À1 ) were significantly higher than those in W-M (1.51 ± 0.15 kg N ha À1 year À1 and 0.84 ± 0.08 kg P ha À1 year À1 ), and the nutrient export coefficients were 291-1271 and 146-489 kg ha À1 year À1 m runoff À1 for TDN and TDP, respectively. Remarkable shifts in cropping systems coupled with varied rainfall-runoff are dominant factors responsible for agricultural nutrient losses. TDN and TDP losses would increase by 70.0% and 59.8%, respectively, if the watershed traditional cropping system of W-M is completely replaced by V-V. The TDN and TDP losses would increase by 36.36%-46.97% under the SSP2-4.5 and SSP5-8.5 climate scenarios until 2100 with a 50% of the watershed area of traditional agricultural plantation converted to modern plantation. This study can enhance our understanding of the effects of cropping system changes coupled with varied rainfall-runoff on nutrient losses in coastal areas of China.

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Section: Resultssupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Cropping system shifts enhanced nutrient yields under changing daily hydrological processes in a coastal watershed of Eastern China

Zhang

Yan

et al. 2023

Hydrological Processes

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“…Similar to controls applied to drinking water, it is very important to control water eutrophication of the YR by controlling the nutrient input in the YRC (Gong et al, 2021; Zhang, Jiao, et al, 2022). Eutrophication is a pressing issue that is likely to worsen because the catchment of inflowing streams might face increasing pressure from cropping system changes and agricultural expansion (Li, Wang, et al, 2019; Vitousek et al, 2009; Zhang et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…However, there were some uncertainties in our model. First, the difficulties in accurately measuring N and P inputs and outputs make calculating the N and P budgets in cropping and forest systems challenging (Li, Wang, et al, 2019). Orchard budget plays an important role in catchment nutrient export (Table 3) and its main uncertainty comes from fertiliser applications.…”

Section: Discussionmentioning

confidence: 99%

“…Widespread socioeconomic development, including expansion and intensification of agricultural activities, occurs in fragile headwater catchments. These result in significant changes in land use and enhanced nutrient budgets (Li, Wang, et al, 2019; Philipsen et al, 2018; Zhang et al, 2015), as well as greenhouse gases (Wang et al, 2021; Zhang, Zhang, et al, 2022). Such changes in headwater catchments have become prevalent problems worldwide due to limited land sources (Laurance et al, 2014; Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Modelling stream nutrient source and yield by coupling hydrological processes and nutrient budgets from an experimental headwater catchment with orchard expansion in the Changjiang River Delta area

Zhang

Wang

et al. 2022

Hydrological Processes

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Although watershed nutrient exports have been well studied and modelled, the dynamic changes in the contributions of individual nutrient sources to reservoirs are less certain under changing land use and climate. The intensification of agriculture has led to expansion in plantation areas and the corresponding increased use of chemical and organic fertilisers in many headwater catchments in recent decades in China. Nutrient yields are potentially substantial because of the expansion of agricultural ecosystems. Here, in combination with biogeochemical nutrient budgets, we developed a synthesis model to quantify daily nutrient yields in terms of dissolved inorganic nitrogen (DIN), dissolved organic nitrogen (DON), dissolved inorganic phosphorus (DIP) and dissolved organic phosphorus (DOP). We also identified their

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Modeling Non-Point Source Nutrient Loads with Different Cropping Systems in an Agricultural Lake Watershed in Southwestern China: From Field to Watershed Scale

Peng

Jin

et al. 2022

Mathematics

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Understanding the influence of cropping systems on non-point source pollution (NPSP) is crucial, since NPSP has become the major nutrient source of lake eutrophication. How to identify the characteristics of the N and P balance at different spatial and temporal scales remains a challenge in pollution control and decision-making. In this study, we built a soil and water assessment tool (SWAT) model coupled with an export coefficient model for a NPSP simulation in the North of Erhai Lake Basin (NELB). A method was proposed to study the N and P transport from fields and the individual sub-basins to Erhai Lake using SWAT simulation. The results showed that the N and P loss fields were mainly situated in the vicinity of the Fengyu river and along the mainstream of the Miju and Mici rivers. N and P loss fields were mainly occupied by rice–broad bean/rice–rapeseed crops and vegetables. While the critical N and P load contribution areas were situated in the vicinity of downstream of the Miju, Yong’an, and Luoshi rivers. The effects of different cropping systems on the N and P export to the watershed were insignificant in the NELB and decreased by 4–9% when changing cropping system compared to the original crops. The NPSP discharged from the critical areas was retained and purified by the flow and the reservoirs scattered along the rivers, and it was noticed that the N and P loss was mainly from the critical pollution discharge areas located downstream of Miju river. This study can provide an important simulation method for understanding NPSPs and, therefore, can help authorities improve agricultural land use and reduce lake pollution.

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Enhanced nitrogen imbalances in agroecosystems driven by changing cropping systems in a coastal area of eastern China: from field to watershed scale

Abstract: Changes of cropping systems are un-neglected driving forces to increase nitrogen imbalance of agricultural development in the watershed scale.

Cited by 3 publications

References 70 publications

Cropping system shifts enhanced nutrient yields under changing daily hydrological processes in a coastal watershed of Eastern China

Cropping system shifts enhanced nutrient yields under changing daily hydrological processes in a coastal watershed of Eastern China

Modelling stream nutrient source and yield by coupling hydrological processes and nutrient budgets from an experimental headwater catchment with orchard expansion in the Changjiang River Delta area

Modeling Non-Point Source Nutrient Loads with Different Cropping Systems in an Agricultural Lake Watershed in Southwestern China: From Field to Watershed Scale

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