Qinghai Lake is located in a hydrologically closed basin at the conjunction of SE and SW monsoons and westerlies . Its frequent lake level fluctuations arising from climatic and monsoonal changes have left a series of...Qinghai Lake is located in a hydrologically closed basin at the conjunction of SE and SW monsoons and westerlies . Its frequent lake level fluctuations arising from climatic and monsoonal changes have left a series of geological records since the last glaciation.The coarse sediments in Core QD1, the sporopollen assemblage representing steppe, the eolian paleo-sanddunes in the east and southeast banks and the fossil glacial topography all indicated frigid and arid climatic conditions and large scale shrinkage of the lake during the last glacial maximum.展开更多
Through several years seedling-growing experiments in nursery in Daxing‘anMountains forest region,the author posed that the seedling cultivated for the region mustpossess the characteristics of being suited to thin a...Through several years seedling-growing experiments in nursery in Daxing‘anMountains forest region,the author posed that the seedling cultivated for the region mustpossess the characteristics of being suited to thin and meager soil and having strongresistance to adverse conditions.For this purpose,the cultivation regime ought to bedirectization,standardization and programmatization;seedling growth ought to be promotedby regulating ecological conditions;and the mursery stock quality ought to be tested usingvigor index.展开更多
Suihua City in Heilongjiang Province is located in the heart of the frigid region with black earth and it has created abundant green property resources. However,the environmental issue of this place has caused wide at...Suihua City in Heilongjiang Province is located in the heart of the frigid region with black earth and it has created abundant green property resources. However,the environmental issue of this place has caused wide attention,so the government should make full use of various means to solve the environment problem and protect the ecology in this region. Among the measures taken by the government,the tax means is the most effective economic device to solve the environmental problem. Economic means supplemented by lawful and administrative measures should be adopted to solve the ecological environmental problems in the frigid region with black earth.展开更多
Water quality index of reservoir source water were tracked during three years in a north frigid area,the effect on supplied water quality was also studied.Based on the analysis of the monitoring data during the same s...Water quality index of reservoir source water were tracked during three years in a north frigid area,the effect on supplied water quality was also studied.Based on the analysis of the monitoring data during the same season,the reservoir source water had typical and seasonal variation characteristics that was divided into four periods including the icebound period,spring period(or peach blossom period),stable period in summer and autumn and winter period.The icebound period was charactered by the typical low temperature and turbidity,pH and oxygen consumption decreased gradually showed that the gradually anaerobic trend existed in the reservoir.In May as the reservoir completely thawed,upstream water inflow and the total pollutant in the reservoir gradually increased,but the bottom of reservoir bottom was stable in the anaerobic state temporarily.The state completely disappeared,various index increased significantly in the middle of July.The water had high chroma characteristics,chroma and turbidity increased significantly in the summer and autumn(7-11months),but stability of water quality was poor because of rainfall.The reservoir gradually froze after the middle of November and the flow of water decreased.The peak of chroma appeared a month later than the water temperature.Due to the water turbidity was low,and the floc was small and light,the conventional water purification process design based on removal of turbidity achieved removal of chroma through a lot dosing of coagulant.展开更多
Cold Rain mixed with snow fell against the kitchen window ofthe house trailer in the U.S.town of Elkins,West Virginia.Melin-da Eichelberger,seven months pregnant,pulled a tray of Christmascookies from the oven.The fri...Cold Rain mixed with snow fell against the kitchen window ofthe house trailer in the U.S.town of Elkins,West Virginia.Melin-da Eichelberger,seven months pregnant,pulled a tray of Christmascookies from the oven.The frigid weather outside made the trailera cozy haven on this night of December 23,1990.展开更多
There has been a long-term dispute on the demarcation of the highest vegetation zone in N. China. Some scientists regard the top zones of Mt. Taibai and Mt. Wutai as the alpine zone, but most insist that they are zone...There has been a long-term dispute on the demarcation of the highest vegetation zone in N. China. Some scientists regard the top zones of Mt. Taibai and Mt. Wutai as the alpine zone, but most insist that they are zones of subalpine shrub meadows or subalpine meadows. I suggest that the highest zone in N. China should be assigned to the alpine zone.展开更多
In Mt. Qomolangma region there is a complete soil zone spectrum from mountain subtropical to alpine frigid landscapes with no or little effect of human activities. Studies on soil geochemistry of mercury and its envir...In Mt. Qomolangma region there is a complete soil zone spectrum from mountain subtropical to alpine frigid landscapes with no or little effect of human activities. Studies on soil geochemistry of mercury and its environmental background value are of great significance.展开更多
The glaciers of the last ice age began to retreat about 15, 000 yearsago, but the warm climate we know today did not emerge directly. For aperiod lasting from about 13, 000 to 11. 700 years ago, the North Atlanticregi...The glaciers of the last ice age began to retreat about 15, 000 yearsago, but the warm climate we know today did not emerge directly. For aperiod lasting from about 13, 000 to 11. 700 years ago, the North Atlanticregion relapsed into frigid conditions. Researchers have long known展开更多
文摘Qinghai Lake is located in a hydrologically closed basin at the conjunction of SE and SW monsoons and westerlies . Its frequent lake level fluctuations arising from climatic and monsoonal changes have left a series of geological records since the last glaciation.The coarse sediments in Core QD1, the sporopollen assemblage representing steppe, the eolian paleo-sanddunes in the east and southeast banks and the fossil glacial topography all indicated frigid and arid climatic conditions and large scale shrinkage of the lake during the last glacial maximum.
文摘Through several years seedling-growing experiments in nursery in Daxing‘anMountains forest region,the author posed that the seedling cultivated for the region mustpossess the characteristics of being suited to thin and meager soil and having strongresistance to adverse conditions.For this purpose,the cultivation regime ought to bedirectization,standardization and programmatization;seedling growth ought to be promotedby regulating ecological conditions;and the mursery stock quality ought to be tested usingvigor index.
基金Supported by the Foundation for Outstanding Youth of Suihua University(SJ09005)
文摘Suihua City in Heilongjiang Province is located in the heart of the frigid region with black earth and it has created abundant green property resources. However,the environmental issue of this place has caused wide attention,so the government should make full use of various means to solve the environment problem and protect the ecology in this region. Among the measures taken by the government,the tax means is the most effective economic device to solve the environmental problem. Economic means supplemented by lawful and administrative measures should be adopted to solve the ecological environmental problems in the frigid region with black earth.
基金Sponsored by the Science and Technology Research Project of Heilongjiang Province Education Department(Grant No.12513088)PromisingYoungsters Training Program of Heilongjiang University of Science and Technology(Grant No.Q20120201)
文摘Water quality index of reservoir source water were tracked during three years in a north frigid area,the effect on supplied water quality was also studied.Based on the analysis of the monitoring data during the same season,the reservoir source water had typical and seasonal variation characteristics that was divided into four periods including the icebound period,spring period(or peach blossom period),stable period in summer and autumn and winter period.The icebound period was charactered by the typical low temperature and turbidity,pH and oxygen consumption decreased gradually showed that the gradually anaerobic trend existed in the reservoir.In May as the reservoir completely thawed,upstream water inflow and the total pollutant in the reservoir gradually increased,but the bottom of reservoir bottom was stable in the anaerobic state temporarily.The state completely disappeared,various index increased significantly in the middle of July.The water had high chroma characteristics,chroma and turbidity increased significantly in the summer and autumn(7-11months),but stability of water quality was poor because of rainfall.The reservoir gradually froze after the middle of November and the flow of water decreased.The peak of chroma appeared a month later than the water temperature.Due to the water turbidity was low,and the floc was small and light,the conventional water purification process design based on removal of turbidity achieved removal of chroma through a lot dosing of coagulant.
文摘Cold Rain mixed with snow fell against the kitchen window ofthe house trailer in the U.S.town of Elkins,West Virginia.Melin-da Eichelberger,seven months pregnant,pulled a tray of Christmascookies from the oven.The frigid weather outside made the trailera cozy haven on this night of December 23,1990.
文摘There has been a long-term dispute on the demarcation of the highest vegetation zone in N. China. Some scientists regard the top zones of Mt. Taibai and Mt. Wutai as the alpine zone, but most insist that they are zones of subalpine shrub meadows or subalpine meadows. I suggest that the highest zone in N. China should be assigned to the alpine zone.
文摘In Mt. Qomolangma region there is a complete soil zone spectrum from mountain subtropical to alpine frigid landscapes with no or little effect of human activities. Studies on soil geochemistry of mercury and its environmental background value are of great significance.
文摘The glaciers of the last ice age began to retreat about 15, 000 yearsago, but the warm climate we know today did not emerge directly. For aperiod lasting from about 13, 000 to 11. 700 years ago, the North Atlanticregion relapsed into frigid conditions. Researchers have long known
