洞庭湖是我国第二大淡水湖。湖区面积广阔,河网纵横,洲滩众多。在大面积的河湖滩地上,芦苇生长非常繁茂。长期以来,由于通行条件限制,湖区芦苇资源一直未进行系统研究,缺乏可靠的资料。这对发展芦苇生产、合理利用资源十分不利。采用先进方法快速、准确地查明湖区芦苇资源,是当前生产和科研工作中亟待解决的课题。

Dongting Lake is the second large fresh water lake of China.Reedsgrow thickly and luxuriantly on a great tract of banks and shores of therivers and lakes.Rather satisfactory results of determining the extent ofreed distribution,calculating its size,growing and yield,and developingreed distribution diagram,through Landsat images analysis,aerial surveyand field investigation,are obtained.In the Landsat false eolour composite images and MSS₇,the colourand grey stage of reed resources and those of ground objects surround themare quite different,the demarcation lines are clear,and images are noti-ceable.According to study and interpretation,the reed-growing area ofDongting Lake amounts to 937,500mu.Rough estimates of reed productionbased on the break up of density,the figurative analyses of the images ofLandsat MSS₇ made by computers,and the data sampling of the fieldsurvey of per-unit yield are rational.Estimates show that the reed pro-duction of 1980 of Dongting Lake area will come up to 600,000—630,000tons.