【摘要】 研究了云勇林场的杉木林在刚皆伐(2004年10月)和皆伐半年后(2005年4月)的土壤养分的变化状况,对杉木林刚皆伐和皆伐半年后,从上到下5个坡位的3个土层(0～20cm、20～40cm和40～60cm)的土壤的pH、有机质、水解性氮、速效磷和速效钾含量进行测定。结果表明,皆伐半年后大多数坡位的各土层土壤pH均低于刚皆伐的相应土层,5个坡位各土层的土壤有机质含量均高于刚皆伐的相应土层,土壤水解性氮含量高于或接近于刚皆伐的相应土层。大多数坡位皆伐半年后的土壤速效磷含量明显低于刚皆伐的相应土层,大多数坡位皆伐半年后各土层的土壤速效钾含量多高于刚皆伐的相应土层。更多还原

【Abstract】 The paper dealt with variations of soil nutrients’ contents of Chinese fir stands between the clear cutting days(in October, 2004) and those half year after that (in April, 2005). The soil pH value and the contents of soil organic matter, hydrolyzable nitrogen, available phosphorus and available potassium were determined at 0-20 cm, 20-40 cm, 40-60 cm layers in five slope positions. Compared with the immediately harvested stands, the pH values at each layer of most slope positions in a half-year after harvested Chinese fir stands were low, their contents of soil organic matter at each layer in the five slope positions were greater than those of the former. Hydrolyzable nitrogen contents at five slope positions in a half-year after harvested Chinese fir stands were greater than the immediately harvested stands or were close to the latter, their available phosphorus contents in most slope positions were lower than the latter, whereas their available potassium contents in most slope positions were greater than the latter.更多还原