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Copyright of Journal of Soil & Water Conservation (1009-2242) is the property of Institute of Soil & Water Conservation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Soil & Water Conservation (1009-2242) is the property of Institute of Soil & Water Conservation and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of Soil & Water Conservation is the property of Bulletin of Soil & Water Conservation Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to analyze the pollution degree of heavy metals in the sediments of the Shaanxi section of the Weihe River, the contents of 10 heavy metal elements Pb, Zn, Cr, Cu, Co, Ni, Cd, As, Sb and Mn in the sediments were analyzed by using the geo-accumulation index, enrichment coefficient, pollution load index, Nemero comprehensive pollution index and potential ecological risk index for comprehensive evaluation of heavy metal pollution in sediments. The results show that in 2015, except for Cr, the other 9 heavy metals in the sediments are all higher than Shaanxi soil background values of from 1.49% to 91.49% and Cd is the highest; in 2016, only Pb, Cu, Co, Cd and Mn are higher than that the background values of 6.21%, 2.10%, 7.92%, 17.02% and 4.41%. Except for Cr and Cd, the inter-annual differences in heavy metal content are not significant. The pollution levels and potential ecological risks of the 10 heavy metals are generally lower, and the 17 sampling sites are medium in general. Among them, Cd, Qingjiang River and Bahe River are the mostly polluted. The prevention and control of agricultural and traffic pollution around the Weihe River should be strengthened and pay close attention to the urban domestic sewage treatment and the input of pollution from the tributaries to the main river. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Soil Organic Carbon (SOC) in agriculture is an important part of soil fertility and terrestrial ecosystems, and its variations affect food production and global carbon cycle, while soil erosion is the main cause of SOC migration and loss. However, the change mechanisms of SOC in agricultural fields and the quantitative relationship between soil erosion and these nutrients are still poorly understood. Studying the effects of soil erosion on organic carbon loss in the different components can provide a theoretical basis for scientifically assessing the role of soil erosion in the carbon cycle and exploring the mechanism of organic carbon turnover in the farmland. In the study, soil erosion characteristics and spatial distribution of its intensity on the convex slopes located in typical black soil areas of Northeast China were investigated based on the 137Cs tracing technique. The relationship between soil erosion intensity and organic carbon components was quantified. Moreover, the differences in organic carbon fractions between uncultivated and cultivated land was also compared. The results showed that the average annual erosion rate from the slope studied was 3801.71 t/(km³a), thus the soil erosion intensity was categorised as moderate erosion. Among the all the sampling points, the 33.33% of them belonged to the severe erosion and 11.11% of them was extremely severe, which were mainly located in the middle of the steeply convex slope, and 26.67% of the points was in the deposition area, which were mainly distributed in the west area at the bottom of the slope. Compared to soils from the uncultivated slope, the average SOC content had decreased by 13.58%, of which Mineral Organic Carbon (MOC) and Particulate Organic Carbon (POC) had decreased by 7.52% and 40.49%, respectively, and the Coarse Particulate Organic Carbon (CPOC) had decreased by 73.24%, while the Fine Particulate Organic Carbon (FPOC) was not significantly different. The SOC, MOC, and FPOC at the deposition sites on the slope were significantly higher than those at the sites eroded (P<0.01); SOC and MOC at the deposition sites and the mild erosion sites were significantly higher than those of above- mild erosion sites (P<0.01); the higher decrease of both SOC and components of MOC and FPOC was observed in the sites where the moderate erosion occurred and changed slightly thereafter. The MOC and FPOC in organic carbon fractions decreased with the increasing erosion intensity, but there was no significant correlation between CPOC and the erosion intensity, and no significant difference between deposition sites and different erosion intensities was also observed(P>0.05). The result indicated that the difference of driving mechanisms of CPOC and MOC reduction may exist on the slope cropland. Overall, the severity of soil erosion in some black soil areas in Northeast China has not been greatly improved. The SOC content has reduced considerably as land use types have changed (reclamation), posing a serious threat to the sustainable development of agriculture in the black soil area. Erosion control and soil fertility replenishment may be the key to achieving sustainable development in the region. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Applied Ecology / Yingyong Shengtai Xuebao is the property of Chinese Journal of Applied Ecology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)