The Research Of Optimizing Monitoring Points About The Ecological Recovery After The Disaster In The Badly Damaged Area By Wenchuan Earthquake

Researches relevant to the construction and improvement of ecological monitoringnetwork are currently carried out both within and outside of our country, along with a vastnumbers of established networks across the globe, which have collected massive informationand data on ecosystem for researchers and government officials. These measures facilitate themaintenance and governance of regional ecosystem and make contribution to ecologicalpreservation as a collaborative cause pursued by humans. Various ecosystems within a regionwould be severely damaged following natural disasters like earthquake and volcanic eruptionwhich wreaked havoc on the region. In the aspect of the degree to which ecologicalenvironment is impacted by natural disasters, experts and scholars around the world havedone a great deal of research and formulated a series of theoretical systems and methods.However, research is scant regarding real time monitoring of ecological condition in thepost-disaster area and survey on the recovery of ecosystem in the disaster-stricken area,exposing the incapability in reasonable adjustment and the progress aiming at speeding up therecovery of the ecological environment. It is thus necessary to set up certain amounts ofmonitoring points in the stricken areas featuring damaged ecological environment. By way ofreal time monitoring of ecological conditions within the stricken areas, data will be collectedand provided to researchers and administrations, so that proper measures and means can beexercised on damaged environment to achieve the recovery in no time.This article takes ten counties within most damaged areas hit by Wenchuan earthquake asthe study areas, employing the space-ground coordination mode to conduct real timemonitoring of the environment and adopting the method which combines RS, GIS, GPS andground monitoring. As the first step, RS was used in imaging observation of the study area,through which disaster-stricken areas were pinpointed in the images. Selection of themonitoring points was based on the determination of severity of the damage caused byearthquake-triggered secondary geological disaster, including crumbling, landslide, mud-rockflow and large barrier lakes formed during the disaster. Images taken in the study area prior todisaster were used to analyze various ecosystem types to narrow down, according tomonitoring layout principle, the range of disaster sites and decide on wide-range ecologicalmonitoring areas, by the aid of soil samples collected along the way, geological features,vegetation type distribution and ecosystem recovery measures adopted in all stricken areas.Multiple ground monitoring points were further set up within each of monitoring areas,according to the same layout principle and method. Ecological element data were collected onthose ground monitoring points which were then optimized and screened by use ofprincipal component analysis, eventually acquiring the result throughout the whole region. Through wide-range and localized monitoring point layout and optimization, as many as36ecological monitoring points were chosen, based on geological disaster sites, following theaforementioned approach. These monitoring points precisely cover various disaster types,vegetation type areas, geological conditions, soil types and ecological recovery measures,showing a positive representativeness. Data acquired from those points enable effectivereflection of current state and recovery of damaged ecological environment, meeting therequirement and goals of setting up recovery monitoring points and forging the basis onwhich regional recovery measures could be rearranged and implemented.