Effect of reforestation on nitrogen and phosphorus dynamics in the catchment ecosystems of subtropical China: the example of the Hanjiang River basin

Wang, Qinxue; Xiao, Qingan; Liu, Chen; Wang, Kelin; Ye, Min; Lei, Alin; Song, Xinshan; Kohata, Kunio

doi:10.1002/jsfa.4607

Cited by 17 publications

(8 citation statements)

References 19 publications

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“…In a similar SWAT modelling study, Wang et al . () evaluated the effects of the RFCL initiative in the Hanjiang River basin, a large subtropical catchment in the Shaanxi and Hubei provinces. The simulation results showed that RFCL (scenario: cultivated lands with a slope >15° were reforested) would cause an obvious decrease in surface runoff (−23·6%) but an increase in groundwater flow (71·8%).…”

Section: Discussionmentioning

confidence: 99%

“…Many previous studies (e.g. Wang et al ., ) only considered analyses at the subbasin level. But water flows are created at the HRU level, influenced by the different combinations of slope, soil and land use.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, policies have been formulated to regulate this kind of LUCC. The following list shows a selection of Chinese policies as well as examples of studies conducted to show the impact of LUCC resulting from one of these programmes on the hydrological conditions: Grain‐for‐Green Programme, also known as Sloping Land Conversion Programme: implemented in 1999 by the Chinese government (Zhou et al ., : runoff and sediment; Deng et al ., : runoff and soil erosion; Long et al ., : soil erosion; Bieger et al ., : water balance and sediment transport; Wang et al ., : carbon) ‘Conversion of Cropland to Forest and Grassland Programme’: nationwide, adopted in 1999 (Qiu et al ., : soil water storage and evapotranspiration; Qiu et al ., : water budget) ‘Reforestation of Cultivated Land’ (RFCL): (Wang et al ., : water flow components, total sediment loading, nitrogen and phosphorus) ‘Returning Farmland to Forest’: since 1989 in the middle and lower reaches of the Yangtze River (Huang et al ., : surface runoff and soil loss) ‘Conversion Cropland to Forest Policy’: in China, especially in the middle and upper reaches of the Yangtze River (Ouyang et al ., : streamflow, sediment yields and main pollutants; Hao et al ., : pollutants and soil loss) ‘Mountain–River–Lake’ (MRL) Development Programme: in 1985 by the Jiangxi Provincial Government (Zhou et al ., : carbon dynamic) …”

Section: Introductionmentioning

confidence: 99%

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Impacts of land use changes on hydrological components and macroinvertebrate distributions in the Poyang lake area

et al. 2014

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Land use and land cover changes are important issues globally resulting in changing hydrological and ecological conditions. In addition to field sampling and measurements, we applied a model cascade comprising an ecohydrological model and a species distribution model. We developed five land use scenarios (three deforestation and two afforestation scenarios) for our Chinese study basin in the Poyang lake area. In detail, we assessed the impact of land use changes on the hydrologic regime and stream macroinvertebrate distributions for the most likely deforestation scenario. Simulated deforestation scenarios result in higher streamflow and surface runoff compared with the base model. The spatial distribution of stream macroinvertebrates, a group of organisms well known as water quality indicators, was modelled to describe the effect of the changing environmental conditions on the freshwater ecosystem. For the deforestation scenario, species richness was reduced, and the occurrence of the stonefly Togoperla sp. decreased considerably.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impacts of land use changes on hydrological components and macroinvertebrate distributions in the Poyang lake area

et al. 2014

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“…SWAT has been used extensively to evaluate the effects of land use change on discharge and water quality (e.g. see Jha et al ., 2010a,b; Schilling et al ., ; Bharati and Jayakody, ; Babel et al ., ; Nie et al ., ; Palamuleni et al ., ; Wang et al ., ). Schilling et al .…”

Section: Introductionmentioning

confidence: 97%

The potential for agricultural land use change to reduce flood risk in a large watershed

et al. 2013

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Effects of agricultural land management practices on surface runoff are evident at local scales, but evidence for watershed-scale impacts is limited. In this study, we used the Soil and Water Assessment Tool model to assess changes in downstream flood risks under different land uses for the large, intensely agricultural, Raccoon River watershed in Iowa. We first developed a baseline model for flood risk based on current land use and typical weather patterns and then simulated the effects of varying levels of increased perennials on the landscape under the same weather patterns. Results suggest that land use changes in the Raccoon River could reduce the likelihood of flood events, decreasing both the number of flood events and the frequency of severe floods. The duration of flood events were not substantially affected by land use change in our assessment. The greatest flood risk reduction was associated with converting all cropland to perennial vegetation, but we found that converting half of the land to perennial vegetation or extended rotations (and leaving the remaining area in cropland) could also have major effects on reducing downstream flooding potential. We discuss the potential costs of adopting the land use change in the watershed to illustrate the scale of subsidies required to induce large-scale conversion to perennially based systems needed for flood risk reduction.

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“…It plays an essential role in maintaining regional ecological and environmental functions, as well as sustaining agricultural production and socioeconomic development [3,[12][13][14]. Around 2000, many national construction projects related to afforestation and dams were carried out in this region, such as the construction of forest protection in the middle-lower Yangtze River starting in 2000, and the operation of the Three Gorges Dam starting in 2003, which significantly influenced the adjacent ecological environment [15][16][17]. As a result of the increase in anthropogenic activities over the past decades, most of the large lakes and reservoirs are now mesotrophic and even eutrophic in the MLYR basin, including Poyang Lake, Dongting Lake, Taihu Lake, and Chaohu Lake, which are the first-, second-, third-and fifth-largest freshwater lakes in China, respectively [18].…”

Section: Introductionmentioning

confidence: 99%

Increasing Outbreak of Cyanobacterial Blooms in Large Lakes and Reservoirs under Pressures from Climate Change and Anthropogenic Interferences in the Middle–Lower Yangtze River Basin

et al. 2019

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In recent decades, the increasing frequency and severity of cyanobacterial blooms in recreational lakes and water supply reservoirs have become a great concern to public health and a significant threat to the environment. Cyanobacterial bloom monitoring is the basis of early warning and treatment. Previous research efforts have always focused on monitoring blooms in a few specific lakes in China using moderate resolution imaging spectroradiometer (MODIS) images, which are available for the years 2000 onward. However, the lack of overall information on long-term cyanobacterial blooms in the lakes and reservoirs in the middle–lower Yangtze River (MLYR) basin is an obstacle to better understanding the dynamics of cyanobacterial blooms at a watershed scale. In this study, we extracted the yearly coverage area and frequency of cyanobacterial blooms that occurred from 1990 to 2016 in 30 large lakes and 10 reservoirs (inundation area >50 km2) by using time series Landsat satellite images from Google Earth Engine (GEE). Then, we calculated the cyanobacterial bloom area percentage (CAP) and the cyanobacterial bloom frequency index (CFI) and analyzed their inter-annual variation and trends. We also investigated the main driving forces of changes in the CAP and CFI in each lake and reservoir. We found that all reservoirs and more than 60% of lakes exhibited an increasing frequency and coverage area of cyanobacterial blooms under the pressures of climate change and anthropogenic interferences. Reservoirs were more prone to be affected by fertilizer consumption from their regional surroundings than lakes. High temperatures increased blooms of cyanobacteria, while precipitation in the lake and reservoir regions somewhat alleviated blooms. This study completes the data records of cyanobacterial blooms in large lakes and reservoirs located in hotspots of the MLYR basin and provides more baseline information before 2000, which will present references for water resource management and freshwater conservation.

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Effect of reforestation on nitrogen and phosphorus dynamics in the catchment ecosystems of subtropical China: the example of the Hanjiang River basin

Abstract: The results suggest that RFCL is an effective policy for watershed environment management, which might have a relatively small effect on river discharge but that the purification effects on water quality in the river would be remarkable.

Cited by 17 publications

References 19 publications

Impacts of land use changes on hydrological components and macroinvertebrate distributions in the Poyang lake area

Impacts of land use changes on hydrological components and macroinvertebrate distributions in the Poyang lake area

The potential for agricultural land use change to reduce flood risk in a large watershed

Increasing Outbreak of Cyanobacterial Blooms in Large Lakes and Reservoirs under Pressures from Climate Change and Anthropogenic Interferences in the Middle–Lower Yangtze River Basin

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