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seasonal frozen
相关语句
  季节冻土
    Seasonal Frozen Soil and Its Effect on Vegetation Production in Haibei Alpine Meadow
    海北高寒草甸的季节冻土及在植被生产力形成过程中的作用
短句来源
    2) A long-term maintenance of the seasonal frozen soil is good for plant survivor and organism remaining in soil, which migrate with soil freezing and melting.
    2)季节冻土的长时间维持,有利于植物残体和土壤有机质留存于土壤,并随土壤冻结和融化过程发生迁移,可提高土壤肥力;
短句来源
  “seasonal frozen”译为未确定词的双语例句
    Relativity Between Enrichment of Seasonal Frozen stagnant Water and Plant Growth
    季节冻结滞水富水性与植物生长的相关性
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  seasonal frozen
According to the spatial distribution of the third loading eigenvectors of (Ts-Ta) over the Qinghai-Xizang Plateau in cold season, the permafrost response region and the seasonal frozen ground response region are identified.
      
Seasonal frozen ground occurs in large parts of the territory in northern China, including Northeast, North, Northwest China and the Tibetan Plateau except for permafrost regions, and accounting for about 55% of the land area of China.
      
The seasonal frozen soil on the Qinghai-Tibet Plateau has strong response to climate change, and its freezing-thawing process also affects East Asia climate.
      
Anomaly feature of seasonal frozen soil variations on the Qinghai-Tibet Plateau
      
Permafrost with MAGT higher than-2°C will turn into seasonal frozen soils and even unfrozen soils.
      
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Indoors and outdoors studies show that frost water migrates into the freezing soil layer in terms of vapor and moisture, so three soil layers which have different water content were divided: one is rich in water, .it is found that its water content is increased from 8% to 40% after frost; one is deficient in water, water content of which is decreased from 15% to 30% after frost; the third is transporting water in the form of vapor, its water content is found to be decreased from 6% to 20% . Dynamic characters...

Indoors and outdoors studies show that frost water migrates into the freezing soil layer in terms of vapor and moisture, so three soil layers which have different water content were divided: one is rich in water, .it is found that its water content is increased from 8% to 40% after frost; one is deficient in water, water content of which is decreased from 15% to 30% after frost; the third is transporting water in the form of vapor, its water content is found to be decreased from 6% to 20% . Dynamic characters show timeliness and metamorphosis. Seasonal frozen stagnant water can be absorbed directly by plant and balance water metabolization in winter and spring. Temperature rises in spring, frozen soil begins to thaw. Frozen stagnant water turns to soil water at first. It is the best season for plant seeds to germinate and seedling to grow when the frozen stagnant water content is at 20% to 40% . Frozen soil which will thaw entirely would lost its water from evaporations on the surface and seepage if afforestation is too late, buts the thawing soil layer couldn't be thick enough to meet the depth needed if it is made earlier. The development of root system is in accord with enrichment of water in kremastic water zone. Frozen stagnant water content varies with the depth of soil. To make best use of the resource of frozen stagnant water, depth, density and seed for afforestation should be chosen carefully .

在冻结势作用下,包气带水重新分配,以液态和气态向冻土层迁移富集并冻结成冰。在富水带,水量比冻结前增加8%~40%;过度贫水带,比冻结前水量减少15%~30%;汽化输水带,比冻结前减少了6%~20%。春季土壤开始解冻,冻结滞水首先转化为土壤水,冻结滞水含水量为20%~40%。要把握适时造林深度、密度,树种选择要适宜,才能充分利用冻结滞水资源。

Annual mean soil temperature at 0 to 160-cm depths is higher than 1 ^8 ℃ and annual mean air temperature is about {-1.7 } ℃ in Haibei alpine meadow. Mat-Cryic cambisols under vegetation belongs to seasonal frozen soil. Because of low air temperature, it is possible that frozen soil may form in all seasons. A stable layer of frozen soil can form from November. The frozen soil layer reaches the deepest, about 230 cm, in the period from March to April. Surface ground of the frozen...

Annual mean soil temperature at 0 to 160-cm depths is higher than 1 ^8 ℃ and annual mean air temperature is about {-1.7 } ℃ in Haibei alpine meadow. Mat-Cryic cambisols under vegetation belongs to seasonal frozen soil. Because of low air temperature, it is possible that frozen soil may form in all seasons. A stable layer of frozen soil can form from November. The frozen soil layer reaches the deepest, about 230 cm, in the period from March to April. Surface ground of the frozen soil thaws from March to April. The process of thawing also begins from the bottom of the frozen soil layer, with a lightly thawing rate. Process of thawing can last to the last ten days of June, or the first ten days of July. The seasonal frozen soil plays an active role on vegetation production in the alpine meadow. The role is: 1) The seasonal frozen soil supplies an ample water resource, which compensates the precipitation not enough in the period from end of the spring to initial of the summer, for plant growth, especially, for initial nutrient growth of herbage. 2) A long-term maintenance of the seasonal frozen soil is good for plant survivor and organism remaining in soil, which migrate with soil freezing and melting. So, the seasonal frozen soil plays an important role for increasing fertility of soil. 3) High water content in soil is also good for the formation of humscd, in turn; the humscd offers some other organism for plant growth. 4) High water content in frozen soil increases the thermal capacity of soil, able to regulate the sequent of climate unusually oscillating. 5) Changing rate of the seasonal frozen soil has an important effect on herbage biomass.

海北高寒矮嵩草草甸区植被下的草毡寒冻雏形土属季节性冻土,因温度低,冻土在年内的每个月均可发生.一般在11月中旬可形成稳定的季节冻结层,至翌年3~4月冻土层厚度最大可达230cm.从3月下旬到4月中旬开始,土壤开始消融,至6月下旬到7月上旬冻土全部消失.分析发现,季节冻土在高寒草甸植被生产力形成过程中有着积极的影响作用,主要表现在:1)季节冻土的存在和维持将给高寒植物生长提供良好的土壤水分,对植物初期营养生长发育有利,可弥补春夏之交时降水不足所引起的干旱胁迫影响;2)季节冻土的长时间维持,有利于植物残体和土壤有机质留存于土壤,并随土壤冻结和融化过程发生迁移,可提高土壤肥力;3)较高的土壤水分有利于土壤胡敏酸的形成,可保证植物生长所需的其它有机元素的供给;4)冻土层所形成较高的土壤水分使土体热容量加大,从而调节因气候异常波动引起的土壤温度变化;5)季节冻土的变化对植物地上年生产量形成有一定的影响作用,表现出从10月或11月开始,土壤冻结速率快,对提高植物地上年生产量有利.这也证实,在未来气候变暖的趋势下,土壤有机质将加快分解速度,土壤水分因受温度升高、冻结期缩短,其贮存能力降低;受温度升高的影响,地表蒸发能力加大...

海北高寒矮嵩草草甸区植被下的草毡寒冻雏形土属季节性冻土,因温度低,冻土在年内的每个月均可发生.一般在11月中旬可形成稳定的季节冻结层,至翌年3~4月冻土层厚度最大可达230cm.从3月下旬到4月中旬开始,土壤开始消融,至6月下旬到7月上旬冻土全部消失.分析发现,季节冻土在高寒草甸植被生产力形成过程中有着积极的影响作用,主要表现在:1)季节冻土的存在和维持将给高寒植物生长提供良好的土壤水分,对植物初期营养生长发育有利,可弥补春夏之交时降水不足所引起的干旱胁迫影响;2)季节冻土的长时间维持,有利于植物残体和土壤有机质留存于土壤,并随土壤冻结和融化过程发生迁移,可提高土壤肥力;3)较高的土壤水分有利于土壤胡敏酸的形成,可保证植物生长所需的其它有机元素的供给;4)冻土层所形成较高的土壤水分使土体热容量加大,从而调节因气候异常波动引起的土壤温度变化;5)季节冻土的变化对植物地上年生产量形成有一定的影响作用,表现出从10月或11月开始,土壤冻结速率快,对提高植物地上年生产量有利.这也证实,在未来气候变暖的趋势下,土壤有机质将加快分解速度,土壤水分因受温度升高、冻结期缩短,其贮存能力降低;受温度升高的影响,地表蒸发能力加大,若降水仍保持目前的水平,土壤水分将明显减少,将导致高寒草甸植被生产力有下降的可能.

 
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