Response of Water and Nitrogen Losses to Water Management Practices and Green Manure Application in Lowland Paddy Fields

Xu, Baoli; Shao, Dongguo; Chen, Shu; Li, Haoxin; Fang, Longzhang

doi:10.1061/(asce)ir.1943-4774.0001244

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…Thus, TN, TP concentrations and fluxes in the Xiangsi River showed significant seasonal variations as discharge, benefited from the significant correlation with discharge ( Table 3). The role of hydrological conditions in controlling nitrogen and phosphorus export in surface water systems has been verified in several studies [48,49]. In our study, the TN and TP fluxes of the upstream catchment can be calculated by power function equations (Table 4).…”

Section: Spatio-temporal Variations Of Riverine Nutrient Controlled Bsupporting

confidence: 64%

Spatio-Temporal Dynamics of Riverine Nitrogen and Phosphorus at Different Catchment Scales in Huixian Karst Wetland, Southwest China

Pan

Dai

et al. 2020

Water

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Spatio-temporal dynamics of riverine nitrogen (N) and phosphorus (P) in karst regions are closely linked to hydrological conditions, human activities and karst features in upstream catchments. From October 2017 to September 2019, we undertook 22 sampling campaigns in 11 nested catchments ranging from 21.00 to 373.37 km2 in Huixian karst wetland to quantify forms, concentrations, and fluxes of riverine total nitrogen (TN) and total phosphorus (TP), and to identify spatial and temporal variations of nutrients transfer from upstream to downstream, tributaries (Mudong River and Huixian River) to the main stem (Xiangsi River) in the dry and wet seasons. Considering the hydrological conditions, human activities and karst features within upstream catchments, the following three spatial and temporal variations of riverine nutrients were found over the monitoring period: (1) the dynamics of riverine nitrogen and phosphorus varied seasonally with hydrological conditions; (2) the spatial disparities of riverine nitrogen and phosphorus were induced by different human activities within catchment scales; (3) the dynamics of riverine nitrogen and phosphorus varied similarly at spatial scale restricted by karst features. The findings from this study may improve our understanding of the influence of hydrological conditions, human activities and karst features on nitrogen and phosphorus variations in river waters at different spatial and temporal scales in the Huixian karst wetland basin, and will help managers to protect and restore river water environments in karst basin from a catchment-scale perspective.

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Section: Spatio-temporal Variations Of Riverine Nutrient Controlled Bsupporting

confidence: 64%

Spatio-Temporal Dynamics of Riverine Nitrogen and Phosphorus at Different Catchment Scales in Huixian Karst Wetland, Southwest China

Pan

Dai

et al. 2020

Water

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“…The operation of these water projects needs to consider the variability of local weather and regional climate to realize efficient water resource management [7][8][9]. Given a reliable forecast of short-term precipitation, for example, irrigation will not be carried out though it should be [10]. With the region warming and crop area extending, some reservoirs are likely to supply irrigation water earlier than before [11].…”

Section: Introductionmentioning

confidence: 99%

Regional Agroclimate Characteristic and Its Multiple Teleconnections: A Case Study in the Jianghan Plain (JHP) Region

Shao

et al. 2021

Water

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Agricultural production depends on local agroclimatic conditions to a great extent, affected by ENSO and other ocean-atmospheric climate modes. This paper analyzed the spatio-temporal distributions of climate elements in the Jianghan Plain (JHP), Central China, and explored the impacts from teleconnection patterns, aimed at providing references for dealing with climate change and guiding agricultural activities. Both linear and multifactorial regression models were constructed based on the frequentist quantile regression and Bayesian quantile regression method, with the daily meteorological data sets of 17 national stations in the plain and teleconnection climate characteristic indices. The results showed that precipitation in JHP had stronger spatial variability than evapotranspiration. El Niño probably induced less precipitation in summer while the weakening Arctic Oscillation might lead to more summertime precipitation. The Nash-Sutcliffe efficiency (NSE) of the multifactorial and linear regression model at the median level were 0.42–0.56 and 0.12–0.18, respectively. The mean relative error (MRE) ranged −2.95–−0.26% and −7.83–0.94%, respectively, indicating the much better fitting accuracy of the multiple climatic factors model. Meanwhile it confirmed that the agricultural climate in JHP was under the influence from multiple teleconnection patterns.

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“…In addition, it has been reported that GM can maintain or increase the planting growth and the crop yield. Planting GM can form dense grass layer, inhibit weed seed germination, and reduce water runoff by increasing soil coverage area and decreasing sediment erosion [17]. Application of GM can reduce some negative effects caused by chemical and organic fertilizers, and it has potential benefits in enhancing the soil physical structure, preserving its moisture content, increasing its water permeability, and enhancing the carbon sequestration [18,19].…”

Section: Introductionmentioning

confidence: 99%

Improving Ecological Functions and Ornamental Values of Traditional Pear Orchard by Co-Planting of Green Manures of Astragalus sinicus L. and Lathyrus cicera L.

et al. 2021

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Traditional orchards received little attention in ecology. In order to enhance the ecological function of traditional pear orchard, it is an effective strategy to co-plant the ornamental green manure (GM) under the pear forest. In this study, two kinds of GM, i.e., Astragalus sinicus L. (AS) and Lathyrus cicera L. (LC), were co-planted in pear tree orchard to elevate its landscape benefits of spatiotemporal distribution of flowers, the nutrient benefits and oxygen production. The results showed that the flower height of AS and LC arrange between 20~30 cm, and the flowering period covers the March. LC has a large number of flowers, a small area of single flower, and high yield of fresh grass. AS has a small number of flowers, a large area of single flower, and low yield of a single fresh grass. Among them, 35% AS + 65% LC and 50% AS + 50% LC are more suitable in achieving the well tourism value and potential good production of pear orchard. Nutrient accumulation, total carbon fixation and oxygen production, flower number of 35% AS + 65% LC are larger than other treatments, while the flower period of 50% AS + 50% LC is longest. This study proposed a “win-win” GM planting strategy for sustainable orchard development, by enhancing ecology functions and the landscaped value of the traditional fruit orchard.

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Response of Water and Nitrogen Losses to Water Management Practices and Green Manure Application in Lowland Paddy Fields

Cited by 7 publications

References 28 publications

Spatio-Temporal Dynamics of Riverine Nitrogen and Phosphorus at Different Catchment Scales in Huixian Karst Wetland, Southwest China

Spatio-Temporal Dynamics of Riverine Nitrogen and Phosphorus at Different Catchment Scales in Huixian Karst Wetland, Southwest China

Regional Agroclimate Characteristic and Its Multiple Teleconnections: A Case Study in the Jianghan Plain (JHP) Region

Improving Ecological Functions and Ornamental Values of Traditional Pear Orchard by Co-Planting of Green Manures of Astragalus sinicus L. and Lathyrus cicera L.

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