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| Relativity Between Enrichment of Seasonal Frozen stagnant Water and Plant Growth |
| Na Pingshan1,Li Hanxue2,Zhang Shengli1,Xu Hongfeng1 |
| 1.Forestry College, Inner Mongolia Agricultural University, 010019;2.Forestry Public Security Bureau, Yuquan District, 010031: Huhehot, China |
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Abstract 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 .
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Received: 15 April 2003
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