甘南高寒草甸球花蓼和鹅观草资源利用权衡与共存状态

doi:10.11733/j.issn.1007-0435.2009.03.007

›› 2009, Vol. 17 ›› Issue (3): 298-303.DOI: 10.11733/j.issn.1007-0435.2009.03.007

甘南高寒草甸球花蓼和鹅观草资源利用权衡与共存状态

白琰, 勾昕, 张仁懿, 王刚

兰州大学干旱农业与生态教育部重点实验室, 甘肃, 兰州, 730000

收稿日期:2009-04-01 修回日期:2009-05-07 出版日期:2009-06-15 发布日期:2009-06-15
通讯作者: 王刚,E-mail:wgmg36@lzu.edu.cn
作者简介:白琰(1977- ),男,河北曲阳人,博士研究生,研究方向为草地生态学,E-mail:bainbai@gmail.com
基金资助:
国家自然科学基金项目(30770360)

Trade-off between Resource Utilization and Coexistence Status of Roegneria kamoji and Polygonum sphaerostachyum of Alpine Meadow in the South of Gansu

BAI Yan, GOU Xin, ZHANG Ren-yi, WANG Gang

Key Laboratory of Arid Agroecology of the Ministry of Education, Lanzhou University, Lanzhou, Gansu Province 730000, China

Received:2009-04-01 Revised:2009-05-07 Online:2009-06-15 Published:2009-06-15

摘要/Abstract

摘要： 为深入了解高寒草甸植物群落共存及多样性维持机制,2006年6月在2种施氮处理与施磷处理水平下,研究鹅观草(Roegneria kamoji)和球花蓼(Polygonum sphaerostachyum)的净光合速率、光合水分利用效率与光合氮素利用效率变化情况,调查其在水分梯度下的分布模式。结果表明,球花蓼具有较高的光合氮素利用效率,并对土壤水分的变化反应敏感;鹅观草具有较高的光合水分利用效率,并对土壤氮素水平的变化反应敏感。同时,鹅观草多出现在较干旱位置而球花蓼更多的出现在湿润位置。分析得出:球花蓼和鹅观草在资源利用方面存在权衡(trade-off)关系,这有助于它们共存于群落中;球花蓼与鹅观草共存状态受到土壤水分和氮素的影响,一旦土壤水分、氮素发生变化,其共存状态也会随之变化。

关键词: 球花蓼, 鹅观草, 光合氮利用效率, 光合水分利用效率, 相对丰富度

Abstract: In order to understand the biodiversity formation and maintenance mechanism of plant community in alpine meadow and provide the theoretical base for grassland vegetation reestablishment,the net photosynthetic rates of Roegneria kamoji Ohwi and Polygonum sphaerostachyum Meisn.were measured under two N and two P application treatments.Photosynthetic water use efficiency(PWUE) and photosynthetic nitrogen use efficiency(PNUE) were calculated and the relative abundances of R.kamoji and P.sphaerostachyum in communities along with soil water gradients were examined in this study.The results show that R.kamoji had higher PWUE and lower PNUE in comparison with P.sphaerostachyum;R.kamoji responded sensitively to the changes in soil N content,whereas P.sphaerostachyum responded to the variations in soil water content sensitively.Additionally,more R.kamoji appeared in dryer areas and more P.sphaerostachyum in wetter areas.Our results indicate that the coexistence of R.kamoji and P.sphaerostachyum was attributed to the trade-off between resource utilization manners,and the coexistence would occur where N levels were low and water was deficient.Moreover,the relation of coexistence of R.kamoji and P.sphaerostachyum would change with the fluctuation of N and water content at soil.

Key words: Polygonum sphaerostachyum Meisn., Roegneria kamoji Ohwi, Photosynthetic water use efficiency, Photosynthetic nitrogen use efficiency, Relative abundance

中图分类号:

Q948.122.1

白琰, 勾昕, 张仁懿, 王刚. 甘南高寒草甸球花蓼和鹅观草资源利用权衡与共存状态[J]. , 2009, 17(3): 298-303.

BAI Yan, GOU Xin, ZHANG Ren-yi, WANG Gang . Trade-off between Resource Utilization and Coexistence Status of Roegneria kamoji and Polygonum sphaerostachyum of Alpine Meadow in the South of Gansu[J]. , 2009, 17(3): 298-303.

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甘南高寒草甸球花蓼和鹅观草资源利用权衡与共存状态

Trade-off between Resource Utilization and Coexistence Status of Roegneria kamoji and Polygonum sphaerostachyum of Alpine Meadow in the South of Gansu

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