论文部分内容阅读
利用“3S”技术对湖南省土壤侵蚀动态变化进行了研究,结果发现:①1995年和2000年的土壤侵蚀现状都表明,湖南省土壤侵蚀在空间分布上存在东西方向由东西两侧向中部呈马鞍状递降、南北方向由南向北呈长波式递降的规律;②1995年湖南省主要存在水力侵蚀、重力侵蚀和工程侵蚀3种侵蚀类型,以水力侵蚀为主,约占总侵蚀面积的98.85%,2000年湖南省基本上消灭了重力侵蚀和工程侵蚀,仅存水力侵蚀类型;③湖南省土壤侵蚀面积在时间序列上呈下降之势,2000年较1995年土壤侵蚀面积减少了728.55 km2。水力侵蚀类型中各侵蚀强度面积有增加的,也有减少的,部分侵蚀强度的面积增加是因为更严重一级或几级的水力侵蚀区、重力侵蚀区和工程侵蚀区经治理后形成的一种假象;④通过精度验证,判读准确率平均为89.83%,结果可信。
Using “3S” technology to study the dynamic changes of soil erosion in Hunan Province, the results showed that: ① The soil erosion status in 1995 and 2000 shows that the spatial distribution of soil erosion in Hunan Province exists from east and west sides to the middle It showed a saddle-like pattern with a decreasing trend of longwave from north to south in south and north direction. (2) There were three types of erosion mainly in hydraulic erosion, gravity erosion and engineering erosion in Hunan Province in 1995, with hydraulic erosion accounting for 98.85% of the total erosion area %. In 2000, Hunan Province basically eradicated gravity erosion and engineering erosion, leaving only the type of water erosion. In the time series, the soil erosion area in Hunan Province showed a downward trend. In 2000, the area of soil erosion was reduced by 728.55 km2 in 2000. The area of erosion intensity in the types of hydraulic erosion increased, but also decreased, and the area of partial erosion intensity increased because of the more serious erosion of one or more levels, the erosion of the gravity and the erosion of the project area after the formation of a False impression; ④ Through accuracy verification, the average accuracy of interpretation is 89.83%, the result is credible.