Spatio-temporal changes of landscape eco-security based on structure and function safety: A case study of a large artificial forest planted area in Ximeng county, China

Landscape structure of a large artificial forest planted area tends to be homogeneous by the intensive disturbance of human activities, and the landscape function has been greatly changed as well as landscape structure. Therefore, it is particularly important to introduce landscape function into landscape ecological security research, which can reflect the change characteristics of landscape ecological security systematically and objectively. Taking Ximeng county, a large artificial forest planted area as the study area, this paper established a landscape ecological security model by landscape structure safety index and landscape function safety index. The landscape structure safety index consists of landscape interference degree and landscape fragile degree, and landscape function safety index consists of ecosystem service value. Then spatiotemporal changes of landscape eco- security in Ximeng from 2000 to 2010 were analyzed by dividing the security degree into three levels from low to high:Ⅰ,Ⅱ,Ⅲ level.The results showed that: 1) The landscape ecological security model can effectively reflect the ecological safety of every landscape type, and the order of ecological safety degree of landscape type in 2010 is forestrubberwatersshrubberypaddy field grassland dry land construction land. 2) The plantation of large area of artificial forest in the past 10 years has caused the levels of landscape ecological security in Ximeng converted from Ⅲ to Ⅰ and Ⅱ.The ecological security degree in the whole county decreased but still stayed at an intermediate level. 3) The landscape ecological security in Ximeng is significantly different in space, which presents an overall pattern of "high in northeast and southeast, and low in northwest and southwest". Landscape ecological security of Zhongke village is the best, while that of Mengsuo village is the worst.