标题：CHANGES OF SOIL CHARACTERISTICS
AS A RESULT OF SUBSTITUTION OF WHITE POPLAR (POPULUS ALBA L.)FOREST WITH PLANTATION OF BALD CYPRESS (TAXODIUM DISTICHUML.RICH.)
摘要：Researches were conducted on a 70 years old seed plantation of Bald cypress (Taxodium dis-tichum)established on the habitat of White poplar and White willow(Salicion albae)and in natural for-est of White poplar.As a result of chemical changes of organic material that comes to the land surface as a leaf waste, there are many changes as for the num-ber of microorganisms and that caused some changes in their relations related to the soil in a natural forest of White poplar (Populus alba). It affected changes in soil characteristics with the increased relation be-tween carbon and nitrogen, then with the increased content of humus, decreased acidity of the soil and increased content of available forms of phosphorus and potassium.
关键词：Populus alba;Taxodium distichum;substitution of spe-cies;soil microorganisms;properties of soil
