植被碳密度梯度分布附其与气候因子关系.docVIP

西藏高寒草原生态系统植被碳密度 梯度分布及其与气候因子的关系 王建林1,欧阳华2,王忠红1,常天军1,沈振西2,钟志明2 （1. 西藏农牧学院植物科学技术系，西藏 林芝　860000； 2. 中国科学院地理科学与资源研究所，北京　100101） 摘 要：基于西藏高寒草原生态系统中以水分为主要驱动力的东西样带和以温度为主要驱动力的南北样带内的实测数据，分析了植被碳密度的分布特征及其与气候因子之间的关系。结果表明:1）在28°46′－31°40′N的南北样带内， 植被碳密度随着纬度的增加而增加，当纬度增加到一定程度后，则随着纬度的增加而减少，呈现出南北低、中间高的分布特征；2）在80°02′－91°50′E的东西样带内，植被碳密度随着经度的增加而增加，呈现出东高西低的分布特征；3）无论南北样带还是东西样带，植被碳密度分布是年均气温和年均降水量综合作用的结果，年均降水量的作用大于年均气温。 关键词：西藏高寒草原；植被碳密度；回归分析；气候因子 Gradual distribution of vegetation carbon density and relation with climatic factors in tibetan alpine grassland ecosystem Jian-Lin1,OU Yang-Hua2,WANG Zhong-Hong1,CHANG Tian-Jun1,SHEN Zhen-Xi2 ,ZHONG Zhi-ming2 (1. Plant Sci-Tech Department of Tibet Agricultural and Animal Husbandry College, Linzhi 860000, China； 2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China ) Abstract: Based on the data from the soil samples surveyed along the East-West Tibet Transect (EWTT) is mainly driven by precipitation and the North-South Tibet Transect (NSTT) is mainly driven by temperature in Tibetan alpine grassland ecosystem, the vegetation carbon density distribution characteristics and the relation-ship between it and climatic factors were analyzed. It was shown that the vegetation carbon density was increase when the latitude increase firstly and then decrease in NSTT, within the latitude range of 28°46′-31°40′N, the distribution took on the lower in the southern and the northern, and the higher in the middle zone. But the vegetation carbon density was increase when the longitude increase in EWTT, within the range of 80°02′-91°50′E, the distribution took on the higher in the eastern and the lower in the western. However, the vegetation carbon density was influenced synthetically by the average annual temperature and the average annual rainfall, but influence of the last to the first for it. Key words: Tibetan alpine grassland； Vegetation carbon density； Regression analysis；Climatic factors 陆地生态系统的有机碳主要储存在植被和土壤中。相