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| 塔克拉玛干沙漠南缘柽柳冠下枯枝落叶沉积特征 | |
| 引用本文： | 贺俊霞,穆桂金,张鹂,万的军,潘燕芳,苏永亮.塔克拉玛干沙漠南缘柽柳冠下枯枝落叶沉积特征[J].第四纪研究,2009,29(4):781-788. |
| 作者姓名： | 贺俊霞 穆桂金 张鹂 万的军 潘燕芳 苏永亮 |
| 作者单位： | 1. 中国科学院新疆生态与地理研究所,乌鲁木齐,830011;中国科学院研究生院,北京,100049;新疆策勒荒漠草地生态系统国家野外科学观测研究站,策勒,848300 2. 中国科学院新疆生态与地理研究所,乌鲁木齐,830011;新疆策勒荒漠草地生态系统国家野外科学观测研究站,策勒,848300 3. 中国科学院新疆生态与地理研究所,乌鲁木齐,830011 |
| 基金项目： | 新疆维吾尔族自治区科技攻关计划项目，国家重点基础研究发展规划(973计划) |
| 摘 要： | 柽柳是分布广泛的耐盐耐旱植物，温带干旱区重要物种。观测证明柽柳冠下有机凋落物的沉积作用是显著的，具有有机碳沉积埋藏的重要意义。有机质凋落沉积量与柽柳当年生长量关系不密切，但受当地水分条件、气温变化和风沙作用影响显著。在策勒绿洲前缘，柽柳冠下有机质凋落物年沉积量达到400g/m2。当多枝柽柳冠丛受到损伤或生长受到胁迫时，沉积明显增加，年生长量与凋落量之比(回归量)﹥40%; 在时间序列上，有机凋落物与无机碎屑的主要沉积过程是明显分开的，有机凋落物沉积主要发生在冬季，占年沉积量的75%以上，而同期无机碎屑沉积量不足5%。沉积交替过程对有机凋落物形成了良好的埋藏保存作用； 在空间范围上，有机凋落物并不是在冠下均匀或对称分布的。在风的影响下，冠丛下风侧有机凋落物被显著集中。冠丛丘的顶部只是无机碎屑的沉积中心区而并非有机凋落物。 |
| 关 键 词： | 凋落物沉积 柽柳冠丛丘 亚洲中部 土壤碳蓄积作用 |
LITTER SEDIMENTARY CHARACTERISTICS UNDER THE Tamarix ramosissima SHRUB AT THE SOUTHERN MARGIN OF THE TAKLIMAKAN DESERT |
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| He Junxia,Mu Guijin,Zhang Li,Wan Dejun,Pan Yanfang,Su Yongliang.LITTER SEDIMENTARY CHARACTERISTICS UNDER THE Tamarix ramosissima SHRUB AT THE SOUTHERN MARGIN OF THE TAKLIMAKAN DESERT[J].Quaternary Sciences,2009,29(4):781-788. | |
| Authors: | He Junxia Mu Guijin Zhang Li Wan Dejun Pan Yanfang Su Yongliang |
| Institution: | Xinjiang Institute of Ecology and Geography|Chinese Academy of Sciences|Ürümqi 830011|Graduate University of Chinese Academy of Sciences|Beijing 100049|Cele National Field Science Observation and Research Station of Desert Grassland and Ecosystem|Cele 848300 |
| Abstract: | Tamarix is widely distributed in the transitional zone between oasis and desert.The Cele National Field Observation Station for Desert Grassland and Ecosystem(Cele Station)at the western edge of the Cele artificial oasis was selected for this study.Tamarix grows with sand deposition and a Tamarix cone is formed.The growth of Tamarix cone is a process of soil carbon accumulation.We choose five Tamarix cones named A,B,C,D,and E in the station.We have counted the growth amount of the shrub and collected the litter-fall under the shrub to study the deposition of the litter-fall under Tamarix shrubs.Observations prove that the sedimentation of organic litter under Tamarix shrub is obvious and important for the burial of organic carbon.The relationship of the deposition of organic litter and growth of Tamarix is not closely related,but it is obviously affected by the local water conditions,temperature changes,and the wind and sand.The deposition of organic litter under Tamarix shrubs in the front of the Cele Oasis reaches 400g/m2.When the shrub of Tamarix ramosissima is injured or has growth pressure,the deposition increases obviously,and the ratio of annual growth to litter quantity will be more than 40%.In time series,the main deposit process of the organic litter and inorganic debris is clearly separated.The deposition of organic litter occurs mainly in winter,accounting for more than 75% in annual deposition,while inorganic deposition is less than 5% in the same period.The alternating deposition process forms a good preservation and burial of the organic litter.Spatially,the distribution of organic litter is not uniform nor symmetrical under the coronal of the Tamarix shrub.With influence of the wind,the organic litter mainly on the lee of the shrub.The top of the shrub cone is the deposition center of inorganic clasticmateriai rather than of organic litter. |
| Keywords: | litter deposition Tamarix shrub cone Central Asia soil carbon accumulation |
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