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During the last 40 years, the quantity and spatial patterns of farmland in Western Jilin have changed dramatically, which has had a great impact on soybean production potential. This study used one of the most advanced crop production potential models, the Global Agro-Ecological Zones model, to calculate the soybean production potential in Western Jilin based on meteorological, topography, soil and land use data, and analyzed the impact of farmland change on soybean production potential during 1975–2013. The main conclusions were the following: first, the total soybean production potential in Western Jilin in 2013 was 8.92 million tonnes, and the average soybean production potential was 1612 kg/ha. The production potential of eastern area was higher than the other areas of Western Jilin. Second, farmland change led to a growth of 3.30 million tonnes in soybean production potential between 1975 and 2000, and a decrease of 1.03 million tonnes between 2000 and 2013. Third, taking account of two situations of farmland change, the conversion between dryland and other categories, and the change of irrigation percentage led to the total soybean production potential in Western Jilin increased by 2.31 and only 0.28 million tonnes respectively between 1975 and 2000, and increased by 0.12 and 0.29 million tonnes respectively between 2000 and 2013. In general, the increase of soybean potential production was mainly due to grassland and woodland reclamation. The results of this study would be a good guideline for protecting safe baseline of farmland, managing land resources, and ensuring continuity and stability of soybean supply and food security.
Luoman Pu; Shuwen Zhang; Fei Li; Ranghu Wang; Jiuchun Yang; Liping Chang. Impact of Farmland Change on Soybean Production Potential in Recent 40 Years: A Case Study in Western Jilin, China. International Journal of Environmental Research and Public Health 2018, 15, 1522 .
AMA StyleLuoman Pu, Shuwen Zhang, Fei Li, Ranghu Wang, Jiuchun Yang, Liping Chang. Impact of Farmland Change on Soybean Production Potential in Recent 40 Years: A Case Study in Western Jilin, China. International Journal of Environmental Research and Public Health. 2018; 15 (7):1522.
Chicago/Turabian StyleLuoman Pu; Shuwen Zhang; Fei Li; Ranghu Wang; Jiuchun Yang; Liping Chang. 2018. "Impact of Farmland Change on Soybean Production Potential in Recent 40 Years: A Case Study in Western Jilin, China." International Journal of Environmental Research and Public Health 15, no. 7: 1522.
In recent 40 years, the quantity and spatial patterns of farmland in Western Jilin have changed dramatically, which had great impact on soybean production potential. This study used one of the most advanced crop production potential models, the Global Agro-cological Zones model, to calculate the soybean production potential in Western Jilin based on meteorological, terrain, soil and land use data, and analyzed impact of farmland change on soybean production potential during 1975-2013. The main conclusions were the following. First, the total soybean production potential in Western Jilin in 2013 was 89.22 thousand tons. The production potential of eastern area was higher than the other areas of Western Jilin. Second, farmland change led to a growth of 33.03 thousand tons in soybean production potential between 1975 and 2000, and a decrease of 10.30 thousand tons between 2000 and 2013. Third, taking account of two situations of farmland change, the conversion between dryland and other categories, and the change of irrigation percentage led to the total soybean production potential in Western Jilin increased by 23.13 and only 2.87 thousand tons respectively between 1975 and 2000, and increased by 1.13 and 2.81 thousand tons respectively between 2000 and 2013. In general, the increase of soybean potential production was mainly due to grassland and woodland reclamation. The results of this study would be a good reference for protecting safe baseline of farmland, managing land resources, and ensuring continuity and stability of soybean supply and food security.
Luoman Pu; Shuwen Zhang; Fei Li; Ranghu Wang; Jiuchun Yang; Liping Chang. Impact of Farmland Change on Soybean Production Potential in Recent 40 Years: a Case Study in Western Jilin, China. 2018, 1 .
AMA StyleLuoman Pu, Shuwen Zhang, Fei Li, Ranghu Wang, Jiuchun Yang, Liping Chang. Impact of Farmland Change on Soybean Production Potential in Recent 40 Years: a Case Study in Western Jilin, China. . 2018; ():1.
Chicago/Turabian StyleLuoman Pu; Shuwen Zhang; Fei Li; Ranghu Wang; Jiuchun Yang; Liping Chang. 2018. "Impact of Farmland Change on Soybean Production Potential in Recent 40 Years: a Case Study in Western Jilin, China." , no. : 1.
Urban green spaces have been shown to decrease land surface temperature (LST) significantly. However, few studies have explored the relationships between urban green spaces and LST across different seasons at different spatial scales. In this study, using Changchun, China as a case study, landscape ecology and comparative approaches were employed quantitatively to investigate the effects of the composition and configuration of urban green spaces on the urban thermal environments. LST maps were retrieved from Landsat 8 Thermal Infrared Sensor (TIRS) data acquired on four dates that represented four different seasons, and detailed information of urban green spaces was extracted from high resolution imagery GF-1. Normalized differential vegetation index (NDVI) and six landscape metrics at patch, class, and landscape level were used to characterize the spatial patterns of urban green spaces. The results showed that urban green spaces did have significant cooling effects in all seasons, except for winter, but the effects varied considerably across the different seasons and green types, and seemed to depend on the NDVI and size of urban green spaces. Compared to shape metrics, the negative relationships between the LST and the area and the NDVI of urban green spaces were more significant. Both the composition and configuration of urban green spaces can affect the distribution of LST. Based on findings with one city, given a fixed area of urban green spaces, the number of green patches can positively or negatively affect the LST, depending on if the number is larger than a threshold or not, and the threshold varies according to the given area. These findings provide new perspectives, and further research is also suggested, to generate a better understanding of how urban green spaces affect the urban thermal environment.
Chaobin Yang; Xingyuan He; Ranghu Wang; Fengqin Yan; Lingxue Yu; Kun Bu; Jiuchun Yang; Liping Chang; Shuwen Zhang. The Effect of Urban Green Spaces on the Urban Thermal Environment and Its Seasonal Variations. Forests 2017, 8, 153 .
AMA StyleChaobin Yang, Xingyuan He, Ranghu Wang, Fengqin Yan, Lingxue Yu, Kun Bu, Jiuchun Yang, Liping Chang, Shuwen Zhang. The Effect of Urban Green Spaces on the Urban Thermal Environment and Its Seasonal Variations. Forests. 2017; 8 (5):153.
Chicago/Turabian StyleChaobin Yang; Xingyuan He; Ranghu Wang; Fengqin Yan; Lingxue Yu; Kun Bu; Jiuchun Yang; Liping Chang; Shuwen Zhang. 2017. "The Effect of Urban Green Spaces on the Urban Thermal Environment and Its Seasonal Variations." Forests 8, no. 5: 153.
This research is focused on gully erosion mapping and monitoring at multiple spatial scales using multi-source remote sensing data of the Sancha River catchment in Northeast China, where gullies extend over a vast area. A high resolution satellite image (Pleiades 1A, 0.7 m) was used to obtain the spatial distribution of the gullies of the overall basin. Image visual interpretation with field verification was employed to map the geometric gully features and evaluate gully erosion as well as the topographic differentiation characteristics. Unmanned Aerial Vehicle (UAV) remote sensing data and the 3D photo-reconstruction method were employed for detailed gully mapping at a site scale. The results showed that: (1) the sub-meter image showed a strong ability in the recognition of various gully types and obtained satisfactory results, and the topographic factors of elevation, slope and slope aspects exerted significant influence on the gully spatial distribution at the catchment scale; and (2) at a more detailed site scale, UAV imagery combined with 3D photo-reconstruction provided a Digital Surface Model (DSM) and ortho-image at the centimeter level as well as a detailed 3D model. The resulting products revealed the area of agricultural utilization and its shaping by human agricultural activities and water erosion in detail, and also provided the gully volume. The present study indicates that using multi-source remote sensing data, including satellite and UAV imagery simultaneously, results in an effective assessment of gully erosion over multiple spatial scales. The combined approach should be continued to regularly monitor gully erosion to understand the erosion process and its relationship with the environment from a comprehensive perspective.
Ranghu Wang; Shuwen Zhang; Luoman Pu; Jiuchun Yang; Chaobin Yang; Jing Chen; Cong Guan; Qing Wang; Dan Chen; Bolin Fu; Xuejia Sang. Gully Erosion Mapping and Monitoring at Multiple Scales Based on Multi-Source Remote Sensing Data of the Sancha River Catchment, Northeast China. ISPRS International Journal of Geo-Information 2016, 5, 200 .
AMA StyleRanghu Wang, Shuwen Zhang, Luoman Pu, Jiuchun Yang, Chaobin Yang, Jing Chen, Cong Guan, Qing Wang, Dan Chen, Bolin Fu, Xuejia Sang. Gully Erosion Mapping and Monitoring at Multiple Scales Based on Multi-Source Remote Sensing Data of the Sancha River Catchment, Northeast China. ISPRS International Journal of Geo-Information. 2016; 5 (11):200.
Chicago/Turabian StyleRanghu Wang; Shuwen Zhang; Luoman Pu; Jiuchun Yang; Chaobin Yang; Jing Chen; Cong Guan; Qing Wang; Dan Chen; Bolin Fu; Xuejia Sang. 2016. "Gully Erosion Mapping and Monitoring at Multiple Scales Based on Multi-Source Remote Sensing Data of the Sancha River Catchment, Northeast China." ISPRS International Journal of Geo-Information 5, no. 11: 200.
The black soil region of Northeast China has suffered from severe soil erosion by water. Hillslope and gully erosion are the main erosion types. The objective of this research was to integrate the assessment of hillslope and gully erosion and explore spatial coupling relations between them in the Mushi River sub-catchment using geographical conditions monitoring (GCM) including remote sensing (RS) and geographic information system (GIS) techniques. The revised universal soil loss equation (RUSLE) model and visual satellite image interpretation were used to evaluate hillslope and gully erosion, respectively. The results showed that (1) the study area as a whole had slight erosion due to rill and sheet erosion, but suffered more serious gully erosion, which mainly occurs in cultivated land; (2) GCM contributed to the overall improvement of soil erosion assessment, but the RUSLE model likely overestimates the erosion rate in dry land; (3) the hillslope and gully erosion were stronger on sunny slopes than on shady slopes, and mainly occurred at middle elevations. When the slope was greater than 15 degrees, the slope was not the main factor restricting the erosion, while at steeper slopes, the dominant forest land significantly reduced the soil loss; (4) trends of gully erosion intensity and density were not consistent with the change in soil erosion intensity. To our knowledge, this study was one of the first that attempted to integrate gully erosion and hillslope erosion on a watershed scale. The findings of this study promote a better understanding of the spatial coupling relationships between hillslope and gully erosion and similarly indicate that GCM, RS, and GIS can be used efficiently in the hilly black soil region of Northeast China to assess hillslope and gully erosion.
Ranghu Wang; Shuwen Zhang; Jiuchun Yang; Luoman Pu; Chaobin Yang; Lingxue Yu; Liping Chang; Kun Bu. Integrated Use of GCM, RS, and GIS for the Assessment of Hillslope and Gully Erosion in the Mushi River Sub-Catchment, Northeast China. Sustainability 2016, 8, 317 .
AMA StyleRanghu Wang, Shuwen Zhang, Jiuchun Yang, Luoman Pu, Chaobin Yang, Lingxue Yu, Liping Chang, Kun Bu. Integrated Use of GCM, RS, and GIS for the Assessment of Hillslope and Gully Erosion in the Mushi River Sub-Catchment, Northeast China. Sustainability. 2016; 8 (4):317.
Chicago/Turabian StyleRanghu Wang; Shuwen Zhang; Jiuchun Yang; Luoman Pu; Chaobin Yang; Lingxue Yu; Liping Chang; Kun Bu. 2016. "Integrated Use of GCM, RS, and GIS for the Assessment of Hillslope and Gully Erosion in the Mushi River Sub-Catchment, Northeast China." Sustainability 8, no. 4: 317.