[1]刘学东,陈林,杨新国,等. 荒漠草原2种柠条（Caragana korshinskii)和油蒿(Artemisia ordosica)灌丛土壤养分“肥岛”效应[J].西北林学院学报,2016,31(4):26-32.[doi:doi:10.3969/j.issn.1001-7461.2016.04.05]
　LIU Xue-dong,CHEN Lin,YANG Xin-guo,et al. “Fertile Island” Effect of Soil Nutrients Occurring in Caragana korshinskii and Artemisia ordosica Shrubs in Desert Steppe[J].JOURNAL OF NORTHWEST FORESTRY UNIVERSITY,2016,31(4):26-32.[doi:doi:10.3969/j.issn.1001-7461.2016.04.05]
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 荒漠草原2种柠条（Caragana korshinskii)和油蒿(Artemisia ordosica)灌丛土壤养分“肥岛”效应()
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《西北林学院学报》[ISSN:1001-7461/CN:61-1202/S]

卷:
第31卷
期数:
2016年第4期
页码:
26-32
栏目:
出版日期:
2016-07-31

文章信息/Info

Title:
 “Fertile Island” Effect of Soil Nutrients Occurring in Caragana korshinskii and Artemisia ordosica Shrubs in Desert Steppe
文章编号:
1001-7461(2016)04-0026-07
作者:
 刘学东1; 2; 3; 陈林1; 2; 3; 杨新国1; 2; 3; 赵伟1; 2; 3; 李学斌4*
 (1.宁夏大学 西北退化生态系统恢复与重建教育部重点实验室，宁夏 银川 750021；2.宁夏大学 西北土地退化与生态恢复省部共建国家重点实验室培育基地，宁夏 银川 750021；3.宁夏大学 西部生态与生物资源开发联合研究中心，宁夏 银川 750021；4.宁夏大学 科学技术处，宁夏 银川 750021)
Author(s):
 LIU Xue-dong1; 2; 3; CHEN Lin1; 2; 3; YANG Xin-guo1; 2; 3; ZHAO Wei1; 2; 3; LI Xue-bin4*
 (1.Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in North-Western China of Ministry of Education;2.Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of Northwestern China; 3.Union Research Center for Ecological and Exploitation of Biological Resources in Western China)
关键词:
灌丛植被; 肥岛效应; 富集作用
Keywords:
shrub vegetation;  fertile island effect;  enrichment
分类号:
S793
DOI:
doi:10.3969/j.issn.1001-7461.2016.04.05
文献标志码:
A
摘要:
 “肥岛”是荒漠草原生态系统灌丛植被富集养分、维持自身生存的普遍现象，其对灌丛以及草原生态系统的结构和功能都具有重要影响。通过对柠条（Caragana korshinskii)和油蒿(Artemisia ordosica)2种不同植被类型灌丛的3种生境（冠下、冠缘和灌丛间地）的土壤进行采样、测试和分析。结果表明：1)柠条和油蒿灌丛均存在“肥岛”现象，主要在表层土壤（0~20 cm）表现得最为明显，其土壤养分指标与灌丛间土壤的差异随土壤深度增加而降低；2)从“肥岛”的空间尺度来看，油蒿“肥岛”的水平范围超出了本身冠幅覆盖区，而柠条“肥岛”相对小于本身冠幅覆盖区，其作用深度亦小于油蒿，体现了灌丛对土壤养分富集的物种效应；3)同一物种灌丛对土壤不同养分元素的富集作用有差异性。总体来说，研究区灌丛“肥岛”的发育具有明显的物种效应，相对柠条而言，油蒿灌丛土壤养分聚集效应更明显，其原因主要是油蒿灌丛低矮和茂密的冠层空间结构更利于凋落物的捕获与保存，较多凋落物的输入与土壤结构和养分间的正反馈机制加速了油蒿冠下土壤生物地球化学循环，使其“肥岛”效应能达到更广、更深的空间范围。
Abstract:
 “Fertile island”(FI) is a phenomena occurring in the soils of the shrubs in desert steppe ecosystem,in which nutrients are enriched by the vegetations to survive.It has significant effects on the structures and functions of the shrubs,as well as steppe ecosystems.In this study,soil samples were collected from two shrub species,Caragana korshinskii and Artemisia ordosica in 3 locations: under the canopy，canopy periphery,and interspace.The nutrients in the soil samples were measured and analyzed.The results showed that,1) both shrub species existed FI phenomenon,manifested mainly in the surface soil (0-20 cm),differences in soil nutrients decreased with the increase of soil depth.2) In the view of spatial scale,the level of FI in A.ordosica was beyond the crown coverage area,while for C.korshinskii,it was smaller than the crown area,and the depth of interaction was also smaller than A.ordosica,reflecting the differences of soil nutrient enrichment among shrub species.3) Within the same species,the abilities to enrich different nutrients were different.Overall,the development FI in shrubs demonstrated obvious species effects,compared to C.korshinskii,A.ordosica exhibited significant soil nutrient aggregation effect.Because A.ordosica was a low shrub with dense canopy,which was favorable to collect and conserve litter,more litter input and its positive feedback to soil nutrients accelerated the A.ordosica crown soil biogeochemical cycles,making the FI effect wider and deeper.

备注/Memo

备注/Memo:
 收稿日期：2015-12-25修回日期：2016-03-02
基金项目：国家自然科学基金项目（31460123，41101301，31260581），教育部科学技术研究项目(413060)。
作者简介：刘学东，男，硕士研究生，研究方向：植物生态学。E-mail:lxd3902132@163.com
*通信作者：李学斌，男，博士，副研究员，硕导，研究方向：草地生态学、土壤碳循环等。E-mail:lixuebing@nxu.edu.cn
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