不同放牧率对旱黄梅衣生物量和化学元素组成的影响

应用生态学报 ›› 2001, Vol. ›› Issue (3): 369-373.

不同放牧率对旱黄梅衣生物量和化学元素组成的影响

李香真, 邢雪荣, 陈佐忠

中国科学院植物研究所, 北京 100093

收稿日期:1999-09-10 修回日期:2000-03-13 出版日期:2001-05-25
通讯作者: 李香真,男,1967年3月生,博士,助研,主要从事草原生态系统生物地球化学循环和草地退化生态学方面的研究,发表论文20余篇.E-mail:Xiangzhenl@yahoo.com
基金资助:
国家自然科学基金资助项目(227021A和49790020)

Effect of grazing rate on biomass and element composition of Xanthoparmelia camtschadalis

LI Xiangzhen, XING Xuerong, CHEN Zuozhong

Institute of Botany, Chinese Academy of Sciences, Beijing 100093

Received:1999-09-10 Revised:2000-03-13 Online:2001-05-25

摘要/Abstract

摘要： 对羊草草原群落中旱黄梅衣生物量和化学元素组成与放牧率关系的研究表明,轻度放牧(1.33只羊·hm^-2)时,旱黄梅衣生物量达到最大值,极重牧(6.67只羊·hm^-2)时生物量最低.旱黄梅衣体内C、N、Ca含量较高,＞1%;P、Mg、K、Fe含量介于0.1%～1%;Na、Mg、Cu、Zn、B均＜0.1%.旱黄梅衣中Ca含量明显高于维管植物,是喜Ca植物.放牧处理下,旱黄梅衣含C量下降,N含量提高,C/N比在中度、重度放牧率下较低.Ca、Mg、K、Fe、Mn、Cu含量表现为无牧处理时较低,放牧处理较高.旱黄梅衣的生物量和化学元素组成的变化对放牧强度有着很好的响应,因此可以用旱黄梅衣的生物量和化学元素组成的变化来指示草地生态系统的健康状况和生物地球化学循环特征的变化.

Abstract: Xanthoparmelia camtschadalis is widely distributed in grassland area of Mongolian Plateau. There are few studies on the relationships between biomass,element composition and stocking rate.The relationships of biomass and element composition of Xanthoparmelia camtschadalis to grazing rates in Leymus chinensis steppe in Inner Mongolia were investigated.The results indicated that the biomass of the lichen was highest under light grazing,while the lowest under extremely overgrazing treatment.The C,N and Ca concentrations were higher than 1%,P,Mg,K and Fe were between 0.1% and 1%,and Na,Mn,Cu,Zn,and B were less than 0.1%.The Ca content in Xanthoparmelia camtschadalis was much higher than that in vascular plant.With an increasing grazing rate, the C concentration decreased,while N increased.The C/N ratio was the lowest under moderate and heavy grazing treatments.Ca,Mg,K,Fe,Mn and Cu contents were higher under grazing treatments.The changes of biomass and element composition of Xanthoparmelia camtschadalis had a good response to grazing rate,and hence,it was a good indicator to indicate the healthy condition and changes of biogeochemistry cycles in grassland ecosystems.

中图分类号:

Q146

李香真, 邢雪荣, 陈佐忠. 不同放牧率对旱黄梅衣生物量和化学元素组成的影响[J]. 应用生态学报, 2001, (3): 369-373.

LI Xiangzhen, XING Xuerong, CHEN Zuozhong. Effect of grazing rate on biomass and element composition of Xanthoparmelia camtschadalis[J]. Chinese Journal of Applied Ecology, 2001, (3): 369-373.

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