Coordination of the aerial servey, the author carried ground census on the population size of Red-crowned crane(Grus japonensis) in Khanka Lakes District from 1984 to 1986. According to the census in spring of 1984, t...Coordination of the aerial servey, the author carried ground census on the population size of Red-crowned crane(Grus japonensis) in Khanka Lakes District from 1984 to 1986. According to the census in spring of 1984, the total number of Red-crowned crane is 72 individuals and 20 nests. So that this ground census has recorded 59 individuals more than the aerial survey of 13 individuals, and the percentage of nesting individuals in this flock is 55.6%, which is obviously higher than 36.9% of the average ratio in China. After this, in fall of 1984 and in spring of 1985 and 1986, we repeated the same censuses three times in the same districts, the results indicated that the flock of the crane in Khanka Lakes District is stable basically, but some individuals interchange with opposite flock of USSR because of gcgraphical adjoin.So, we believe this flock in China and that flock in USSR belong to the same population and suggest two countries should act in concert to studing on this population in future. Meanwhile, the aerial servey cooperate with ground census, it is the best way for reducing missing crane and achieving to high precision of census. From this, total number of Red-crowned crane in China is 542 individuals (483+59 ind ividuals).展开更多
采用形态测量和生物化学方法,研究不同年龄(1龄、2龄、3龄及4龄)兴凯湖翘嘴鲌(Culter alburnus in Khanka Lake)消化道指数及各消化组织的消化酶活力。结果表明,兴凯湖翘嘴鲌4个年龄组的脏体指数和肠体指数1龄鱼最低,2龄至4龄呈下降趋势...采用形态测量和生物化学方法,研究不同年龄(1龄、2龄、3龄及4龄)兴凯湖翘嘴鲌(Culter alburnus in Khanka Lake)消化道指数及各消化组织的消化酶活力。结果表明,兴凯湖翘嘴鲌4个年龄组的脏体指数和肠体指数1龄鱼最低,2龄至4龄呈下降趋势,肝体指数随着年龄增长呈现出下降趋势,肠长指数随着年龄增长表现出上升趋势。整体可见前肠和中肠的蛋白酶活性大小相当,后肠次之,肝胰脏最小,各消化组织的蛋白酶活性2龄至4龄鱼随年龄增长而升高;兴凯湖翘嘴鲌肠道是淀粉酶生成的主要器官,整体而言,各消化组织的淀粉酶活性随着年龄增长而逐渐升高;各年龄组的脂肪酶活性大小依次为中肠、后肠、前肠和肝胰脏,各消化组织的脂肪酶活性随着年龄增长呈现出逐渐升高趋势。展开更多
Crossing the Sino-Russian boundary, Xingkai Lake is the largest freshwater lake in Northeast Asia. In addition to the lakeshore, there are four sand hills on the north side of the lake that accumulated during a period...Crossing the Sino-Russian boundary, Xingkai Lake is the largest freshwater lake in Northeast Asia. In addition to the lakeshore, there are four sand hills on the north side of the lake that accumulated during a period of sustainable and stable lacustrine trans gression and were preserved after depression. Analysis of well-dated stratigraphic sequences based on 18 OSL datings combined with multiple index analysis of six sites in the sand hills revealed that the north shoreline of Xingkai Lake retreated in a stepwise fashion since the middle Pleistocene, and that at least four transgressions (during 193-183 ka, 136-130 ka, 24-15 ka and since 3 ka) and three depressions occurred during this process. The results of this study confirmed that transgressive stages were concur- rent with epochs of climate cooling, whereas the period of regression corresponded to the climatic optima. Transgressions and regressions were primarily caused by variations in the intensity of alluvial accumulation in the Ussuri River Valley and fluctuations in regional temperature and humidity that were controlled by climatic change. Moreover, one obvious transgressive process that occurred in MIS3 may have been related to enhanced precipitation that was reportedly widespread in the west of China, while shortterm fluctuations in the lake level might well be a direct response to regional precipitation variations on the millennial scale.展开更多
文摘Coordination of the aerial servey, the author carried ground census on the population size of Red-crowned crane(Grus japonensis) in Khanka Lakes District from 1984 to 1986. According to the census in spring of 1984, the total number of Red-crowned crane is 72 individuals and 20 nests. So that this ground census has recorded 59 individuals more than the aerial survey of 13 individuals, and the percentage of nesting individuals in this flock is 55.6%, which is obviously higher than 36.9% of the average ratio in China. After this, in fall of 1984 and in spring of 1985 and 1986, we repeated the same censuses three times in the same districts, the results indicated that the flock of the crane in Khanka Lakes District is stable basically, but some individuals interchange with opposite flock of USSR because of gcgraphical adjoin.So, we believe this flock in China and that flock in USSR belong to the same population and suggest two countries should act in concert to studing on this population in future. Meanwhile, the aerial servey cooperate with ground census, it is the best way for reducing missing crane and achieving to high precision of census. From this, total number of Red-crowned crane in China is 542 individuals (483+59 ind ividuals).
文摘采用形态测量和生物化学方法,研究不同年龄(1龄、2龄、3龄及4龄)兴凯湖翘嘴鲌(Culter alburnus in Khanka Lake)消化道指数及各消化组织的消化酶活力。结果表明,兴凯湖翘嘴鲌4个年龄组的脏体指数和肠体指数1龄鱼最低,2龄至4龄呈下降趋势,肝体指数随着年龄增长呈现出下降趋势,肠长指数随着年龄增长表现出上升趋势。整体可见前肠和中肠的蛋白酶活性大小相当,后肠次之,肝胰脏最小,各消化组织的蛋白酶活性2龄至4龄鱼随年龄增长而升高;兴凯湖翘嘴鲌肠道是淀粉酶生成的主要器官,整体而言,各消化组织的淀粉酶活性随着年龄增长而逐渐升高;各年龄组的脂肪酶活性大小依次为中肠、后肠、前肠和肝胰脏,各消化组织的脂肪酶活性随着年龄增长呈现出逐渐升高趋势。
基金supported by the National Natural Science Founda-tion of China (40872117)
文摘Crossing the Sino-Russian boundary, Xingkai Lake is the largest freshwater lake in Northeast Asia. In addition to the lakeshore, there are four sand hills on the north side of the lake that accumulated during a period of sustainable and stable lacustrine trans gression and were preserved after depression. Analysis of well-dated stratigraphic sequences based on 18 OSL datings combined with multiple index analysis of six sites in the sand hills revealed that the north shoreline of Xingkai Lake retreated in a stepwise fashion since the middle Pleistocene, and that at least four transgressions (during 193-183 ka, 136-130 ka, 24-15 ka and since 3 ka) and three depressions occurred during this process. The results of this study confirmed that transgressive stages were concur- rent with epochs of climate cooling, whereas the period of regression corresponded to the climatic optima. Transgressions and regressions were primarily caused by variations in the intensity of alluvial accumulation in the Ussuri River Valley and fluctuations in regional temperature and humidity that were controlled by climatic change. Moreover, one obvious transgressive process that occurred in MIS3 may have been related to enhanced precipitation that was reportedly widespread in the west of China, while shortterm fluctuations in the lake level might well be a direct response to regional precipitation variations on the millennial scale.
