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科尔沁沙地南缘在90年代初引种失败后,对原有植被采伐并在采伐迹地进行植被重建。为了研究沙地植被更新13 a后土壤特性,选取土壤容重、有机质、全氮、全磷、全钾、碱解氮、速效钾7个衡量土壤肥力的重要指标作为土壤环境肥力质量的评价指标,采用改进的内梅罗(Nemoro)公式对山杏、彰武小钻杨和白丁香三种林分的土壤环境肥力质量进行综合评价。结果表明,植被重建后土壤特性演变朝良性方向发展,相较于采伐迹地土壤容重减小、田间持水量提高;有机质、氮磷钾及其有效性明显提高,有效磷和碱解氮含量相较于采伐迹地增幅最大;3种植被重建类型对提高土壤上层(0~10 cm)理化性质的能力较下层(10~20 cm)强;樟子松更新迹地3种植被重建类型下土壤肥力质量综合排序为:彰武小钻杨(0.82)>白丁香(0.72)>山杏(0.66)。樟子松固沙林更新迹地植被重建后的土壤理化性质及肥力条件得到了有效改善,且有很大的提升空间。研究结果将为今后科尔沁沙地生态恢复提供科学依据。
Following the unsuccessful introduction of the southern Horqin Sand in the early 1990s, the original vegetation was harvested and replanted on deforested land. In order to study the soil characteristics after 13 years of vegetation regeneration in the sandy land, 7 key indicators of soil fertility, such as soil bulk density, organic matter, total nitrogen, total phosphorus, total potassium, available nitrogen and available potassium, were selected as evaluation indexes of soil environmental fertility quality. The improved Nemoro formula was used to evaluate the soil environmental fertility quality of the three stands, namely, Xing apricot, Zhangwu small drilling poplar and white clove. The results showed that the evolution of soil characteristics evolved in a benign direction after revegetation. The soil bulk density decreased compared with that of deforested land, and the water holding capacity in field increased. The contents of organic matter, nitrogen, phosphorus, potassium and their availability were significantly increased, and the content of available phosphorus and available nitrogen The three types of vegetation reconstruction had the highest ability to improve the physical and chemical properties of the upper layer (0 ~ 10 cm) than the lower layer (10 ~ 20 cm). The soil fertility quality under the three reconstruction types of Pinus sylvestris var. The order was: Zhangwu small drilling Yang (0.82)> white cloves (0.72)> apricot (0.66). The soil physical and chemical properties and fertility conditions of Pinus sylvestris var. The results will provide a scientific basis for the ecological restoration of Horqin sandy land in the future.