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TEXTUAL RESEARCH ON THE MAIN SOURCE OF THE CHANGJIANG RIVER 总被引：2，自引：1，他引：1
The Chinese people began to research the main source of the Changjiang (Yangtze) River 2,400 years ago. Limited by the scientific level, they did not discover it.The Tuotuo River was determined as the main source of the Changjiang River in the 1970s. However, this was not correct, because when comparing the length of the Tuotuo River with the Dam River, the glacier length at the headwaters was added to the Tuotuo River, resulting in that the Tuotuo River is 1 km longer than the Dam River, keeping in mind that the glacier can not be regarded as part of the river.In the summer of 1986, we investigated the source of the Changjiang River, we accurately measured the length of both the Tuotuo and Dam rivers, we discovered that the Dam River was 353.1 km long, and the Tuotuo River was 346.3 km long, the Dam River thus being 6.8 km longer than the Tuotuo River. The discharge of the Dam River is 196.18 m3/ sec., 2.6 times as large as that of the Tuotuo River, that of the Tuotuo River is 75.10 m3/sec. The drainag 相似文献
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It is efficient and reliable to investigate the reed resources of Bosten Lake in Xinjiang, characterized by complicated types of reed land and very different reed growth using colour infrared aerial photos, Landsat images and multi band imagery. At first, on the basis of Landsat images and relevant data, we analyzed the ecological environment of the studied area, the characteristics of reed land types and imaging mechanism to determine the program for abstracting remote sensing information and aerial photographic conditions:On the processed Landsat images and aerial photos, we considered typically geographic features and reed land types, preselected ground sampling sections and sites, then determined indexes classifying reed land types according to sampling data and image characteristics, established various interpretation keys, drew distribution maps of reed land types and measured the area of various types of reed land following geometric correction. On the other hand, based on sampling values and hab 相似文献
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博斯腾湖芦苇资源调查中遥感技术的应用 总被引：6，自引：1，他引：5
前言博斯腾湖位于新疆天山东段的焉耆盆地,面积988平方公里,是我国内陆地区最大的淡水湖。在湖西南开都河三角洲前缘,即小湖区和湖西北的黄水沟洪积平原地区,发育有大片芦苇沼泽。本区芦苇沼泽受天山融雪水和地下水的补给,水分条件较好。土壤以腐殖质沼泽土、泥炭土和盐化泥炭土为主。该区处于欧亚大陆腹地,属大陆性干旱气候区,芦苇生长期内日照长、积温高、昼夜温差大,适宜芦苇的生长发育。因此,博湖芦苇株高、径粗、叶茂、纤维长,是我国重要的优质芦苇生产基地之一。 相似文献
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长春地区稻田甲烷排放量的估算研究 总被引：7，自引：3，他引：4
1995～ 1997年 3年的实验研究中 ,用静态箱法和气相色谱仪对长春地区不同水管理方式稻田的甲烷排放进行了采样和测量工作 ,1996年和 1997年逢晴天还同步进行了地面实验基地的卫星遥感数据 (TM和NOAA—AVHRR数据 )的接收工作。根据测算的稻田甲烷排放通量和用遥感数据提取的水稻种植面积 ,估算出区域尺度的稻田甲烷排放总量。 3年来的研究结果显示 ,长春地区水稻种植面积为 17.72 12× 10 4 hm2 ,稻田甲烷平均排放通量为 2 .984mg/(m2 ·h) ,长春地区稻田甲烷总排放量为 0 .0 2 0 3Tg/a。用灰关联方法分析了稻田甲烷排放的影响因子 ,建立了以水稻植被指数为参数的淹灌稻田的甲烷排放通量估算模型 相似文献
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