Spatial-temporal Characteristics Of Hippophae Rhamnoides Plantations Under Holcocerus Hippophaecolus Disturbance In Jianping, Liaoning, China

In recent years, the seabuchthorn carpenter moth (Holcocerus hippophaecolus Hua, Chou, Fang, Chen) has broken out in many regions of China, including:Inner-Mongolia, Liaoning, Shanxi, Shaanxi and Ningxia Autonomous region and brought a great loss of seabuckthorn industries.We chose Northwest Jianping was as the observation area to study the temporal-spatial characteristics of the seabuckthorn landscape. To evaluate Thematic Maps (TM) collected by Landsat in 1993,1997,2001,2004, and 2007, FRAGSTATS3.3 was used to calculate the seabuchthorn coverage area (CA), patch number (NP), mean fractal dimension index (MFD) and edge density (ED). Multiple statistical tests were employed to analyze the composition and heterogeneity of the landscape and further to reveal the interaction between the moths spread and patches fragmentation. The results were:1)Chronologically, the seabuckthorn landscape pattern can be classified into three categories:type 1-1993 to 1997; type 2-2001 to 2004; type 3-2007. Namely, pre-outbreak, outbreak and post-outbreak.2)Based Turner's review on disturbance issue, we chose spatial and temporal parameters to evaluate the scale of the outbreak of seabuchthorn carpenter moth as a disturbance to locale ecosystem. According to turner's criterion of disturbance classification, the seabuchthorn carpenter moth outbreak in Jian Ping County belongs to F type:system bifurcation or crash, in other words, a catastrophe to locale ecosystem.3) We used NDVI index as the measure of the outbreak of seabuchthom carpenter moth, and employed regression technique to find:the ED was negative correlated with NDVI from 1993 to 2007, indicating that seabuchthom forest fragmentation promoted the outbreak of seabuchthom carpenter moth.