塔里木河下游柽柳沙包稳定同位素碳与灌丛的相关性

doi:10.13866/j.azr.2018.03.28

摘要/Abstract

摘要： 选取新疆塔里木河下游英苏、阿布达勒、喀尔达依3个观测断面，以塔里木河荒漠河岸林的主要建群种——柽柳及其沙包为研究对象，探讨柽柳沙包年层δ¹³C的变化特征，以及不同年层δ¹³C值条件下柽柳灌丛与沙堆形态变化之间的关系。结果表明：① 随着柽柳沙包年层增加，年层凋落物中δ¹³C含量呈逐渐下降趋势。样品δ¹³C平均值为 -24.42‰ ，最大值为-22.09‰ ，最小值为-25.24‰ 。② 随着柽柳沙包年层增加，δ¹³C逐年递减，而柽柳灌丛长轴、短轴、高度、空间占有率和柽柳沙包的高度、长度、宽度及空间占有率均呈增大趋势。③ 柽柳灌丛和沙包的形态参数存在明显相关性，其中柽柳沙包年层与柽柳沙包和灌丛的空间占有率存在显著相关性，表明柽柳沙包对柽柳灌丛生长的促进作用以及灌丛δ¹³C与沙堆间的互馈效应。

关键词: 柽柳灌丛, 柽柳沙堆, 年层, 稳定碳同位素, 碳含量, 塔里木河下游

Abstract:

The Tarim River is located in the north of the Taklimakan Desert in Xinjiang Uygur Autonomous Region, China. The recession of groundwater level and concomitant increase of soil salinity have reduced vegetation coverage in the lower reaches of the river. Tamarix ramosissima is one of the dominant plant species in the riparian ecosystem. With the continuous growth of T. ramosissima shrubberies, sand is blocked by the formation of Tamarixia sand, the T. ramosissima sand-hillocks with unique hierarchical structure form ultimately after a long-term interaction of sand and T. ramosissima shrubberies. T. ramosissima sand-hillocks are rich in environmental information. The sand thickness, grain size and mineral composition of the T. ramosissima sand-hillocks were analyzed. Three observation sections of Yingisu, Abdullah and Karda in the lower reaches of the Tarim River were designed to study the relationship between δ¹³C and carbon content in annual layers of T. ramosissima sand-hillocks and that between the morphological characteristics of T. ramosissima shrubberies and the morphological changes of T. ramosissima sand-hillocks. The results are as follows: (1) The content of δ¹³C in the litters of T. ramosissima was gradually decreased with the increase of annual layers of T. ramosissima sand-hillocks, and there was a negative correlation between δ13C value and carbon content. The average value of δ¹³C of the measured samples was -24.42 ‰, the maximum and the minimum were -22.09‰ and -25.24‰ respectively; (2) As the annual layers of T. ramosissima sand-hillocks increased, the δ¹³C value of the T. ramosissima shrubberies was reduced year by year, and the long axis and short axis, height and spatial occupancy of T. ramosissima shrubberies and the height, length, width and spatial share of the T. ramosissima sand-hillocks were all in an increase trend; (3)There were the good correlations among the morphological parameters of the T. ramosissima shrubberies and of the T. ramosissima sand-hillocks, in which the correlations among the annual layers and the T. ramosissima shrubberies and sand-hillocks were significant, and these revealed that there was a mutual feedback effect between the promotion of the T. ramosissima sand-hillocks to the growth of T. ramosissima shrubberies and the δ¹³C value of the T. ramosissima shrubberies.

Key words: Lower reaches of Tarim River, Tamarix shrub, Age layers, Stable carbon isotope values

刘博，刘红玲，穆雨迪，李桂芳，贺亚玲，庄丽 . 塔里木河下游柽柳沙包稳定同位素碳与灌丛的相关性[J]. 干旱区研究, 2018, 35(3): 735-742.

LIU Bo, LIU Hong-ling,MU Yu-di, LI Gui-fang, HE Ya-ling, ZHUANG Li. Correlation between the Stable Carbon Isotopes in Annual Layers of Tamarix ramosissima Sand-hillocks in the Lower Reaches of the Tarim River[J]. , 2018, 35(3): 735-742.

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