Application Of UAV Remote Sensing Technology And Benthic Index Of Biotic Integrity (B-IBI) To The Assessment Of The Ecosystem Health Of Liaohe Upstream

Liaohe is the core area of national revitalization of northeast old industrial base area,which links the coastal economic belt, Shenyang economic zone and western of Liaoningeconomic zone. At the end of "11th Five-Year Plan" Liaohe conservation area waterenvironment has been significantly improved, take the lead in picking off "heavy pollution hat" from" the country sanhu sanhe" in2012. Liaohe cross-section reached the Ⅳclass waterquality standards. But river ecosystem restoration is a long-term process, and the presentsituation of Liaohe conservation area ecological system integrity is not very clear. Theecosystem health of Liaohe upstream was evaluated by benthic index of biotic integrity(B-IBI) method combined with Unmanned Aerial Vehicle (UAV) remote sensing technology,aiming at providing correlation theory and technical reference for the approach of riverecosystem restoration in Liaohe conservation area or Liaohe basin.In B-IBI evaluation system, the choice of reference points is a crucial step. Much ofresearch method are adopted by expert judgment in the past, it is randomness. This thesis isbased on the research of UAV remote sensing technology and application, the remote sensingmonitoring with high resolution, strong timeliness, low cost, which can realize large area,long-endurance and fixed points and areas advantages etc. Based on the physical, chemical,land utilization information, UAV remote sensing orthophoto maps, and water qualityparameters of16habitat sampling sites at the main upstream, reference sites and impairedsites were screened out. From the spatial distance, the scientificity of reference sites selectionwas verified by analyzing the landscape pattern through the buffer and conducted a furtherstudy on its influence on ecological processes.Six core indexes were selected from the32candidate indexes and normalized each ofthem. We use25%percentile of B-IBI value in reference sites to determine the criteria ofhealth ranking and divide the distribution range below25%percentile into4quarters. Thecriterion for the benthic macro-invertebrate in Liaohe upstream is B-IBI＞3.90,2.93-3.90,1.95-2.93,0.98-1.95and0-0.98, which are corresponding to health, sub-health, fair condition，poor condition and very poor condition, respectively. The results of B-IBI assessment showedthat0.82%stream segments were in health condition,31.26%in sub-health condition,43.43%in fair condition,23.57%in poor condition and0.92%in very poor condition. The relationship between B-IBI and habitat quality was remarkable correlation (R2=0.55P<0.01).In general, the macrobenthos community structure in the main stream of Liaohe upstream,mainly consists of indicating species of moderately polluted water.