不同修复年限下稀土矿区芒萁与土壤碳氮磷化学计量特征  

Stoichiometric Characteristics of Dicranopreris Dichotoma and soil C, N, P during the Different Ecological Rehabilitation Years in the Ionic Rare Earth Mining Area

作　　者：牛玉娇 陈志彪[1,2] 林强 徐芮[1,2] 陈志强 Niu Yujiao;Chen Zhibiao;Lin Qiang;Xu Rui;Chen Zhiqiang(School of Geographical Sciences,Fujian Normal University,Fuzhou Municipality 350007;Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education,Fuzhou Municipality 350007;Fujian Provincial Soil Conservation Experimental Station,Fuzhou Municipality 350003)

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]福建师范大学湿润亚热带生态地理过程教育部重点实验室,福建福州350007 [3]福建省水土保持试验站,福建福州350003

出　　处：《亚热带水土保持》2019年第4期16-21,共6页Subtropical Soil and Water Conservation

基　　金：国家重点研发计划项目“城市群生态安全协同联动决策支持系统开发与综合示范”(2016YFC0502905);国家自然科学基金项目“南方红壤侵蚀区芒萁散布的地学分析及其时空模拟”(41171232);福建省社会发展引导性(重点)项目“福建省稀土矿区差异化治理优化模式与评价”(2016Y0024)

摘　　要：芒萁是我国南方离子型稀土矿区生态修复的重要指示性植物,通过探究不同生态修复年限下的离子型稀土矿区内芒萁的生态化学计量特征,为矿区的生态修复策略提供科学参考。本文选取3处不同修复年限的稀土矿区和1处未开采地为研究样地,采集样地内芒萁的叶片和地下茎根,探究其化学计量特征及其与土壤养分之间的关系。结果表明:①叶片C、N和P含量的变化范围分别为444.62~454.30g/kg、6.87~10.68g/kg、0.31~0.46g/kg;根茎C、N和P含量的变化范围分别为368.36~424.63g/kg、3.31~4.23g/kg、0.16~0.26g/kg;②芒萁叶片养分与土壤养分(除P外)的相关性强于根茎,与0~10cm土层土壤相关性强于10~20cm土层土壤;③不同生态修复年限下芒萁叶片N/P均大于16且该研究区土壤严重缺磷,芒萁生长受磷限制,因此,离子型稀土矿区的生态修复期应增加磷肥施用量以促使芒萁更好地生长。Dicranopreris dichotoma is an important indicator plant in the process of ecological restoration in the rare earth mining area of South China. By exploring the ecological stoichiometric characteristics of Dicranopreris dichotoma under different ecological restoration years in the ionic rare earth mining area, this study provided scientific reference for the ecological restoration strategy of the mining areas. Three ionic rare earth mining areas with different years of restoration and one unexploited rare earth mine were selected as sample site for collection of the leaf and rhizome system of Dicranopreris dichotoma to explore their stoichiometric characteristics and their relationship between soil nutrients in this paper. Results show that: ① the contents of C, N and P in the leaves were 444.62-454.30 g/kg, 6.87-10.68 g/kg and 0.31-0.46 g/kg, respectively. The contents of C, N and P in rhizome were 368.36-424.63 g/kg, 3.31-4.23 g/kg and 0.16-0.26 g/kg, respectively;② the correlation between leaf nutrients and soil nutrients was stronger than that of rhizomes except phosphorus. The correlation between Dicranopreris dichotoma and soil nutrients in 0-10 cm soil layer was stronger than that of in 10-20 cm soil layer;③ In different ecological restoration years, the N/P ratio of the leaves of Dicranopreris dichotoma in an ionic rare earth mining area was higher than 16 and the phosphorus deficiency of this area was serious. Therefore, the growth of Dicranopreris dichotoma is restricted by phosphorus. Application of phosphate fertilizer should be increased during the ecological restoration period of the ionic rare earth mining area to promote better growth for Dicranopreris dichotoma.

关 键 词：离子型稀土矿 生态化学计量特征 芒萁 

分 类 号：S153.6[农业科学—土壤学]