【摘要】 为科学评价灌丛不同恢复期碳储量和土壤养分变化规律,采用"空间代替时间"的方法,对比分析了从1997年至2018年20年来金露梅(Potentilla parvifolia)灌丛不同恢复期碳储量和土壤养分含量变化特征。结果表明,随着金露梅灌丛的逐渐恢复,灌木碳储量增加1.4～6.2倍,灌丛下草本碳储量减少0.9～1.7倍,灌丛群落碳储量增加1.1～2.0倍;0–10 cm土层容重减小,10–30 cm土层容重则呈先减后增趋势;0–30 cm丛间土壤全磷含量减小0.7%～6.0%,速效磷含量减小6.3%～28.8%,速效钾含量总体减小53.9%～61.0%,土壤有机质、速效氮含量呈先增后减趋势,全钾含量则呈先减后增趋势。丛内各层土壤有机质、全钾、速效氮、速效磷、速效钾含量变化趋势与丛间的变化相同。综上,随植被恢复,碳贮量增加,但部分土壤养分呈减少或先增后减趋势,故建议以放牧利用为目的草地应适度控制金露梅灌丛大尺度扩张,以环境效益为目的的草地应促进进展演替。更多还原

【Abstract】 This study aimed to scientifically evaluate the change rule of carbon storage and soil nutrients at different habitat restoration stages. This study used a "spatial for temporal gradient" methodology, which compared changes in carbon storage and soil nutrient content at different restoration stages of Potentilla parvifolia shrubs over a period of nearly 20 years(from1997 to 2018). It provides a theoretical basis for the management of P. parvifolia. The results showed that the carbon storage of shrubs increased by 1.4 to 6.2 times, the carbon storage of the herbaceous understory decreased by 0.9 to 1.7 times, and the carbon storage of the community increased by 1.1 to 2.0 times, with restoration of P. parvifolia. The soil bulk density decreased in the top soil layer(from 0 to 10 cm), and initially decreased and then increased in the 10 to 30 cm soil layer.With the progression succession of P. parvifolia, the total phosphorus, the available phosphorus, and the available potassium content in the soil between shrubs decreased by 0.7% to 6.0%, 6.3% to 28.8%, and 53.9% to 61.0%, respectively; the organic matter and available nitrogen content increased first and then decreased, and the total potassium content first decreased and then increased in the 0 to 30 cm soil layer. The trends observed in the organic matter, total potassium, available nitrogen,available phosphorus, and available potassium content in the soil between the shrubs were same as those observed under the shrubs. To summarize, with restoration of P. parvifolia vegetation, the soil fertility either decreased or first increased and then decreased, and carbon storage increased. Therefore, it is recommended that the large-scale expansion of P. parvifolia shrubs on the grassland for grazing purpose should be controlled, while the progressive succession on the grassland should be promoted to provide environmental benefits.更多还原