Journal of Geo-information Science >
Spatio-temporal Analysis on Soil Erosion over Xuzhou City
Received date: 2018-02-02
Request revised date: 2018-08-08
Online published: 2018-11-20
Supported by
Jiangsu Water Conservancy Science and Technology Project, No.2016067.
Copyright
Based on the 3S techniques and the Revised Universal Soil Loss Equation (RUSLE), we analyzed the spatial and temporal variation in water loss and soil erosion since 2000 for the special topography of the Huangfan Plain-Hilly area in Xuzhou. The results show that between 2000 and 2014 over Xuzhou area, the area for the micro degree of soil erosion grade took account for 76.34%, the moderate degree took account for 10%~17% and the strong degree took account for the least proportion. The micro degree area happened usually in the neighborhood of the downstream of the surrounding area of the Weishan Lake, hilly down land of the Grand Canal, main urban area, the Yellow River flood plain of abandoned yellow river’s left bank and the local area of Fengxian, Xinyi and Pizhou every year. The annual changes in erosion area around Suining, Fengxian and Pizhou were more obvious than the other areas and the total area of soil erosion was declining in general.
Key words: soil erosion; time and space changes; soil erosion equation; 3S techniques; Xuzhou
CHEN Baozhang , QU Junfeng , GE Mengyu , SHEN Yanwen , WANG Anni , WANG Guobin . Spatio-temporal Analysis on Soil Erosion over Xuzhou City[J]. Journal of Geo-information Science, 2018 , 20(11) : 1622 -1630 . DOI: 10.12082/dqxxkx.2018.180091
Fig.1 Distribution of hydrological rainfall monitoring station and national weather station in Xuzhou city图1 徐州市水文降雨监测站和国家气象站站点分布 |
Fig. 2 Spatial distribution map of rainfall erosion factor in typical years of Xuzhou city图2 徐州市典型年份降雨侵蚀因子空间分布图 |
Fig. 3 Spatial distribution map of soil erosion factors in Xuzhou city图3 徐州市土壤侵蚀因子空间分布图 |
Fig. 4 Spatial distribution map of LS factor in Xuzhou city图4 徐州市LS因子空间分布图 |
Fig. 5 Spatial distribution map of vegetation cover factors in typical years of Xuzhou city图5 徐州市典型年份植被覆盖因子空间分布图 |
Tab.1 P values of different land use types表1 不同土地利用类型P值 |
土地利用类型 | P值 | 土地利用类型 | P值 |
---|---|---|---|
水田 | 0.01 | 裸岩 | 0 |
旱地 | p | 覆盖度>50草地 | 1 |
林地 | 1 | 其他草地 | 0.7 |
疏林地 | 1 | 水域 | 0 |
其他林地 | 0.7 | 居民点 | 0 |
滩地 | 0 | 建设用地 | 0 |
注:当s<5°时,p=0.1;当5°≤s<10°时,p=0.221;当10°≤s<15°时,p=0.305;当15°≤s<20°时,p=0.575;当20°≤s<25°时,p=0.705;当s≥25°时,p=0.8,其中,s为坡度 |
Fig. 6 Spatial distribution map of soil and water conservation factors in typical years of Xuzhou city图6 徐州市典型年份水土保持因子空间分布图 |
Fig. 7 Spatial distribution map of soil erosion grade in typical years of Xuzhou city图7 徐州市典型年份土壤侵蚀等级空间分布图 |
Tab. 2 Statistical table of different soil erosion grade area and proportion in Xuzhou City from 2000 to 2014表2 2000-2014年徐州市不同土壤侵蚀强度等级面积与所占比例统计表 |
年份 | 轻度 | 中度 | 强度 | 极强度 | 剧烈 | |||||
---|---|---|---|---|---|---|---|---|---|---|
面积/km2 | 比例/% | 面积/km2 | 比例/% | 面积/km2 | 比例/% | 面积/km2 | 比例/% | 面积/km2 | 比例/% | |
2000 | 251.685 | 71.72 | 51.007 | 14.54 | 22.447 | 6.40 | 22.897 | 6.52 | 2.878 | 0.82 |
2001 | 278.526 | 80.22 | 40.052 | 11.53 | 20.671 | 5.95 | 7.453 | 2.15 | 0.522 | 0.15 |
2002 | 267.817 | 81.59 | 36.709 | 11.18 | 18.561 | 5.65 | 5.068 | 1.54 | 0.080 | 0.02 |
2003 | 306.114 | 72.25 | 58.555 | 13.82 | 24.594 | 5.80 | 29.016 | 6.85 | 5.423 | 1.28 |
2004 | 83.902 | 66.11 | 20.497 | 16.15 | 12.696 | 10.00 | 9.447 | 7.44 | 0.377 | 0.30 |
2005 | 379.213 | 74.02 | 63.761 | 12.45 | 28.335 | 5.53 | 31.191 | 6.09 | 9.788 | 1.91 |
2006 | 108.866 | 73.85 | 19.127 | 12.97 | 12.906 | 8.75 | 6.264 | 4.25 | 0.261 | 0.18 |
2007 | 168.254 | 68.77 | 37.514 | 15.33 | 19.475 | 7.96 | 17.292 | 7.07 | 2.117 | 0.87 |
2008 | 342.229 | 75.84 | 57.097 | 12.65 | 23.085 | 5.12 | 25.413 | 5.63 | 3.415 | 0.76 |
2009 | 163.831 | 77.94 | 24.229 | 11.53 | 15.135 | 7.20 | 6.773 | 3.22 | 0.232 | 0.11 |
2010 | 221.519 | 78.59 | 33.222 | 11.79 | 19.446 | 6.90 | 7.490 | 2.66 | 0.203 | 0.07 |
2011 | 278.889 | 81.55 | 36.882 | 10.78 | 20.899 | 6.11 | 5.272 | 1.54 | 0.058 | 0.02 |
2012 | 281.206 | 82.86 | 36.226 | 10.67 | 17.852 | 5.26 | 4.068 | 1.20 | 0.022 | 0.01 |
2013 | 153.229 | 77.31 | 24.791 | 12.51 | 15.546 | 7.84 | 4.597 | 2.32 | 0.051 | 0.03 |
2014 | 284.657 | 82.48 | 37.204 | 10.78 | 18.714 | 5.42 | 4.532 | 1.31 | 0.029 | 0.01 |
平均 | 237.996 | 76.34 | 38.458 | 12.58 | 19.357 | 6.66 | 12.451 | 3.99 | 1.697 | 0.45 |
标准差 | 85.408 | 5.14 | 13.829 | 1.71% | 4.287 | 1.43% | 9.842 | 2.37 | 2.765 | 0.57 |
变率/% | 35.89 | 6.73 | 35.96 | 13.59 | 22.15 | 21.47 | 79.05 | 59.40 | 162.93 | 126.67 |
The authors have declared that no competing interests exist.
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