论文部分内容阅读
采用对比分析方法，对不同年龄杨树人工林地整地与未整地土壤化学性质进行了研究．结果表明，经犁沟整地破除钙积层后，土壤化学性质约在１０７年恢复到整地前状态，随后土壤养分迅速减小，以至低于整地前水平．２０年后随着林地有机物质的积累，养分开始回升，最终林地养分高于整地前水平．土壤养分恢复的先后顺序为有机质、ＣａＣＯ３、有效Ｎ、全Ｐ、全Ｎ、速效Ｋ和有效Ｐ，恢复周期分别为６、７、７５、９、１０、１７、１７５年．钙积层部位恢复周期为１１４年，恢复先后顺序为有效Ｎ、全Ｐ、有机质、速效Ｋ、ＣａＣＯ３、全Ｎ和有效Ｐ，恢复周期为５５、６、６、８５、９５、１０、３４年．
The comparative analysis method was used to study the soil chemical properties of poplar plantations at different ages. The results showed that the soil chemical properties were restored to pre-soil preparation state in about 10.7 years after the soil was completely removed by furrows, and then the soil nutrients decreased rapidly to below the level before land preparation. After 20 years, with the accumulation of organic matter in forest land, the nutrients began to rise, and finally the nutrient content of forest land was higher than that before land preparation. The sequence of soil nutrient recovery was organic matter, CaCO3, effective N, total P, total N, available K and effective P, and the recovery period was 6, 7, 7 5, 9, 10, 17, 17 5 years respectively. The recovery period of calcareous layer was 11 4 years, and the order of recovery was effective N, total P, organic matter, available K, CaCO3, total N and effective P, the recovery period was 5.5,6,6,8 5, 9 5, 10, 34 years.