| 青藏高原高寒草原生态系统植被磷含量分布特征及其影响因素 |
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| 引用本文： | 王建林,钟志明,王忠红,余成群,张宪洲,胡兴祥,沈振西,大次卓嘎.青藏高原高寒草原生态系统植被磷含量分布特征及其影响因素[J].草地学报,2014,22(1):27-38. |
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| 作者姓名： | 王建林 钟志明 王忠红 余成群 张宪洲 胡兴祥 沈振西 大次卓嘎 |
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| 作者单位： | 1. 西藏农牧学院植物科学学院, 西藏 林芝 860000;2. 中国科学院地理科学与资源研究所, 北京 100101 |
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| 基金项目： | 国家自然科学基金(41061008);国家科技支撑项目(2011BAD17B05-4)资助 |
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| 摘 要： | 采用野外调查与室内分析相结合的研究方法，对高寒草原生态系统植被磷含量的分布特征及其影响因素进行研究。结果表明：青藏高原高寒草原19个草地型植物叶片磷含量的平均值为1.8489±0.6411 g·kg-1，变异系数为34.67%，植物根系磷含量的平均值为1.4130±0.3524 g·kg-1，变异系数为24.94%，植被磷含量总体呈现出东西部高而中间低的态势和斑块状交错分布格局；影响植物叶片磷含量的关键环境因子为：土壤有机质含量> 土壤总有机碳含量> 全氮> 年均气温> 最冷月均气温> 10~20 cm土壤容重> 20~30 cm土壤容重> 土壤水溶性碳含量> 土壤全磷含量> 土壤pH值> 植被高度> 土壤HCO3-含量> 6—9月降水率> 土壤速效钾含量> 土壤速效氮含量；影响植物根系磷含量的关键环境因子则为：年均相对湿度> 年均降水量> 10~20 cm土壤容重> 0~10 cm土壤容重> 10~20 cm土壤含水量> 最冷月均气温> 最暖月均气温> 20~30 cm地下生物量> 土壤pH值。
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| 关 键 词： | 青藏高原 高寒草原 磷含量 分布特征 影响因素 |
| 收稿时间： | 2013-05-16 |
Distribution Characteristics and Influence Factors of Vegetation Phosphorus Content of Alpine Grassland Ecosystem in Qinhai-Tibet Plateau |
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| WANG Jian-lin,ZHONG Zhi-ming,WANG Zhong-hong,YU Cheng-qun,ZHANG Xian-zhou,HU Xing-xiang,SHEN Zhen-xi,Dacizhuoga.Distribution Characteristics and Influence Factors of Vegetation Phosphorus Content of Alpine Grassland Ecosystem in Qinhai-Tibet Plateau[J].Acta Agrestia Sinica,2014,22(1):27-38. |
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| Authors: | WANG Jian-lin ZHONG Zhi-ming WANG Zhong-hong YU Cheng-qun ZHANG Xian-zhou HU Xing-xiang SHEN Zhen-xi Dacizhuoga |
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| Institution: | 1. College of Plant Science, Tibet Institute of Agriculture and Animal Husbandry, Linzhi, Tibet 860000, China;2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | The vegetation type of alpine grassland widely distributed in Qinhai-Tibet plateau. The vegetation phosphorus contents and influence factors of alpine grassland ecosystem in Qinhai-Tibet plateau were investigated in this paper based on the methods of field investigation combining with laboratory analysis. Results showed that the average phosphorus content of plant leaves from 19 tested grassland types was 1.8489±0.6411 g·kg-1, the coefficient of variation was 34.67%. And the average phosphorus content of plant roots was 1.4130±0.3524 g·kg-1, the coefficient of variation was 24.94%. The phosphorus contents of vegetation plants were higher in west-east and lower in center with the distribution characteristics of staggered pattern in Qinhai-Tibet plateau. The key environmental influencing factors of leaf phosphorus content were ordered as soil organic matter content > soil organic nitrogen content > soil total nitrogen content > average annual temperature > average temperature in the coldest month >soil bulk densities from 0 cm to 20 cm soil layers > soil hydrolyzed carbon content > soil total phosphorus content > soil pH value > vegetation height > soil HCO3- content > the precipitation rate during the period from June to September > soil available K content > soil available N content. The key environmental influencing factors of root phosphorus content are ordered as average annual humidity > average annual precipitation > soil bulk densities from 0 cm to 20 cm soil layers > soil water contents in the depths of 10 cm to 20 cm > average temperature in the coldest month > average temperature in the warmest month > underground biomass in the soil depths of 20 cm to 30 cm > soil pH value. |
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| Keywords: | Qinghai-Tibet Plateau Alpine grassland Vegetation phosphorus content Distribution characteristics Influence factors |
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