首页 | 本学科首页   官方微博 | 高级检索  
     

祁连山青海云杉叶片氮、磷含量随海拔变化特征
引用本文:胡启武,宋明华,欧阳华,刘贤德. 祁连山青海云杉叶片氮、磷含量随海拔变化特征[J]. 西北植物学报, 2007, 27(10): 2072-2079
作者姓名:胡启武  宋明华  欧阳华  刘贤德
作者单位:1. 中国科学院,地理科学与资源研究所,北京,100101;江西师范大学,地理与环境学院,南昌,330022;中国科学院,研究生院,北京,100039
2. 中国科学院,地理科学与资源研究所,北京,100101
3. 甘肃省祁连山水源涵养林研究院,甘肃张掖,734000
基金项目:国家重点基础研究发展计划(973计划);中国科学院知识创新工程项目
摘    要:于2005年9月在祁连山北坡沿海拔梯度测定了青海云杉(Picea crassifolia)叶片氮、磷含量.结果表明,青海云杉叶氮、磷平均含量分别为9.75和0.97 mg·g-1.在种间水平上,青海云杉叶片氮、磷含量明显低于全球松科其它针叶树种;在种内水平上,随着海拔的增加,青海云杉叶片氮含量表现出降低的趋势,叶片磷含量变化趋势不明显.叶片氮含量与年均气温呈显著正相关关系(r=0.616**),与土壤水分呈显著负相关关系(r=-0.640**),与土壤有机质、全氮均呈显著负相关关系(r=-0.591**,r=-0.564**);叶片磷含量与年均温、土壤水分之间的关系不显著;叶片氮、磷之间的比率为10.2.表明温度和水分对青海云杉叶片氮、磷含量的影响主要是通过影响土壤生物化学过程(如养分有效性、根系对养分的吸收等)来实现的,青海云杉生长更多的受到氮素限制.

关 键 词:祁连山  青海云杉  叶氮、磷  温度  水分
文章编号:1000-4025(2007)10-2072-08
修稿时间:2007-04-27

Variations in Leaf N, P of Picea crassifolia along the Altitude Gradient in Qilian Mountains
HU Qi-wu,SONG Ming-hu,OUYANG Hu,LIU Xian-de. Variations in Leaf N, P of Picea crassifolia along the Altitude Gradient in Qilian Mountains[J]. Acta Botanica Boreali-Occidentalia Sinica, 2007, 27(10): 2072-2079
Authors:HU Qi-wu  SONG Ming-hu  OUYANG Hu  LIU Xian-de
Affiliation:1 Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101 ,China;2 School of Geography and Environment,Jiangxi Normal University, Nanchang 330022, China;3 Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Zhangye, Gansu 734000,China;4. Graduate University of Chinese Academy of Sciences, Beijing 100039,China
Abstract:Leaf nitrogen (N) and phosphorus (P) of Picea crassifolia were investigated along altitude gradient in northern slope of Qilian Mountains in September,2005. The results indicated that the mean N,P in and P of P. crassifolia were lower than those of most other coniferous tree species in pine family globally.At intraspecific level,leaf N decreased with increase of altitude,while leaf P showed no clear pattern along altitude. Leaf N was significantly positively related to mean annual air temperature(r=0. 616**), but negatively related to soil water content(r= -0.640**). Moreover,leaf N was negatively related to soil organic matter (SOM) and total nitrogen (TN)(r=-0.591** ,r=-0.564**). The relations of leaf P to temperature,soil water content, SOM and TN were not significant. Additionally, ratio of leaf N : p was 10. 2.Hence,the influences of temperature and water availability on leaf N,P of P. crassifolia would mainly lie in soil biogeochemical process (e. g. soil nutrient availability,root nutrients uptake) ,and P. crassifolia was more limited by nitrogen,rather than phosphorus.
Keywords:Qilian Mountains  Picea crassifolia  leaf N,P  temperature  water availability
本文献已被 CNKI 维普 万方数据 等数据库收录!
点击此处可从《西北植物学报》浏览原始摘要信息
点击此处可从《西北植物学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号