中国生态农业学报
2010 年 3 月
第 18 卷
第2期
Chinese Journal of Eco-Agriculture, March 2010, 18(2): 235240
DOI: 10.3724/SP.J.1011.2010.00235
念青唐古拉山东南坡高寒草原生态系统表层土壤 活性有机碳的影响因素研究*
王建林 1 欧阳华 2 王忠红 1
林芝
常天军 1
李
鹏1
沈振西 2
北京
钟志明 2
100101)
(1. 西藏农牧学院植物科学技术系
860000; 2. 中国科学院地理科学与资源研究所
摘
要
高寒草原是青藏高原广泛分布的植被类型.本文以念青唐古拉山东南坡高寒草原生态系统为对象,
采用野外调查与室内分析相结合的方法, 对影响高寒草原生态系统表层(0~20 cm)土壤活性有机碳分布的因素 进行了研究.结果表明: 念青唐古拉山东南坡高寒草原生态系统表层(0~20 cm)土壤活性有机碳平均含量为 2.61±0.31 g·kg1; 影响表层土壤活性有机碳分布的地形因子是海拔和坡度, 植被因子是 0~10 cm,10~20 cm 10~20 cm 土壤含水量和 0~20 cm 土壤容重, 化学因子是土壤全钾含量. 土层地下生物量, 物理因子是 0~10 cm, 其中 0~10 cm,10~20 cm 土壤含水量和 0~20 cm 土壤容重影响达显著水平.在海拔 4 421~4 598 m 范围内, 随 着海拔升高, 表层土壤活性有机碳含量表现出增加→减少→增加→减少的分布特征. 关键词 高寒草原生态系统 表层土壤 活性有机碳 地形因子 植被因子 土壤物理因子 青藏高原 中图分类号: Q948.113 文献标识码: A 文章编号: 1671-3990(2010)02-0235-06 土壤化学因子
Influencing factors of topsoil labile organic carbon in alpine grassland ecosystem on the southeast slope of Mountain Nyenquentanglha
WANG Jian-Lin1, OUYANG Hua2, WANG Zhong-Hong1, CHANG Tian-Jun1, LI Peng1, SHEN Zhen-Xi2, ZHONG Zhi-Ming2
(1. Department of Plant Sci-Tech, College of Tibet Agricultural and Animal Husbandry, Linzhi 860000, China; 2. Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China)
Abstract
Alpine grassland is a widely distributed vegetation type across the Qinghai-Tibet plateau. In this paper, we studied the
influencing factors of topsoil labile organic carbon in alpine grassland ecosystem on the southeast slope of Mountain Nyenquentanglha via field investigation and laboratory analysis. Based on the study, average topsoil (0~20 cm) labile organic carbon content in the alpine grassland ecosystem on the studied area is 2.61 ±0.31 g·kg1. The main factors influencing distribution of soil labile organic carbon are altitude and slope gradient (terrain factor), underground soil biomass in the 0~10 cm and 10~20 cm depths (vegetation factor), soil moisture of the 0~10 cm and 10~20 cm depths and soil bulk density of 0~20 cm depth (physical factor), and soil total K content (chemical factor). Soil moisture and bulk density present most significant influence. The distribution characteristics of topsoil labile organic carbon content is in increase-decrease-increase-decrease tendency with altitude in the range of 4 421~4 598 m. Key words Alpine grassland ecosystem, Topsoil, Labile organic carbon, Terrain factor, Vegetation factor, Soil physical factor, Soil chemical factor, Qinghai-Tibet plateau (Received April 6, 2009; accepted July 25, 2009)

下一页