地下水埋深对塔里木河下游建群种植物叶片δ13C值的影响

doi:10.11686/cyxb20140209

草业学报 ›› 2014, Vol. 23 ›› Issue (2): 76-82.DOI: 10.11686/cyxb20140209

地下水埋深对塔里木河下游建群种植物叶片δ¹³C值的影响

任志国^1,2, 陈亚鹏^1*,李卫红¹,刘树宝³

1.中国科学院新疆生态与地理研究所荒漠与绿洲生态国家重点实验室,新疆乌鲁木齐 830011;
2.中国科学院大学,北京 100039;
3.新疆农业大学草业与环境科学学院,新疆乌鲁木齐 830052

收稿日期:2013-05-13 出版日期:2014-02-25 发布日期:2014-04-20
通讯作者: E-mail:chenyp@ms.xjb.ac.cn
作者简介:任志国(1988-),男,甘肃靖远人,在读硕士。E-mail:rzgehu@aliyun.com
基金资助:
国家自然科学基金项目(No.41101533,No.41371515,No.401101102)和新疆自然科学基金(No.2012211A104)资助。

The effect of groundwater depth on the δ¹³C value of constructive species leaf in the lower reaches of the Tarim River

REN Zhi-guo^1,2, CHEN Ya-peng¹, LI Wei-hong¹, LIU Shu-bao³

1.Key Laboratory of Oasis Ecology and Desert Environment Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2.University of Chinese Academy of Sciences, Beijing 100039, China;
3.College of Grassland and Environmental Sciences, Xinjiang Agricultural University, Urumqi 830052, China

Received:2013-05-13 Online:2014-02-25 Published:2014-04-20

摘要/Abstract

摘要： 通过对塔里木河下游不同地下水埋深梯度下胡杨和柽柳叶片δ¹³C值的测定,分析了地下水埋深变化对胡杨和柽柳的长期水分利用效率的影响,为塔里木河下游退化生态系统植被保育和恢复提供科学依据。研究结果表明,随着地下水埋深从2.4 m增加到9.1 m,胡杨叶片δ¹³C值呈现出先升后降的趋势,且在9.1 m处胡杨很可能是通过减少地上生物量的方式来适应加剧的干旱;而柽柳叶片δ¹³C值则随着地下水埋深的增加而逐渐增加,其水分利用效率不断增加,且对地下水埋深变化的适应宽度也较大。对比同一地下水埋深下胡杨和柽柳叶片的δ¹³C值发现,随着地下水埋深不断增加,胡杨的抗旱性比柽柳的弱;对比不同地下水埋深的植物叶片的δ¹³C值发现,胡杨在不同的地下水埋深采取不同的策略适应干旱环境,而柽柳在不同的地下水埋深则通过增加水分利用效率来抵御加剧的干旱。

Abstract: The δ¹³C values of Populus euphratica and Tamarix spp. in the lower reaches of the Tarim River were measured under different groundwater depth gradients and the effect of groundwater depth diversification on long-term water use efficiency was analyzed. This research provides a scientific basis for degraded ecosystem vegetation conservation and restoration in the lower reaches of the Tarim River. The δ¹³C value in P. euphratica leaves initially increased but then decreased as the groundwater depth varied from 2.4 to 9.1 m. P. euphratica was likely to reduce aboveground biomass to adapt to the intensified drought at 9.1 m. The δ¹³C values in Tamarix spp. leaves gradually increased with increasing groundwater depth, indicating that water use efficiency and the width of the adapted groundwater depth increased as the groundwater depth become deeper. The δ¹³C values of P. euphratica and Tamarix spp. leaves were compared under the conditions of the same groundwater depth and It was found that drought resistance of P. euphratica was weaker than that of T. chinensis with increasing groundwater depth. Under conditions of different groundwater depths, the δ¹³C values of P. euphratica and Tamarix spp. leaves were compared. P. euphratica used different strategies at different groundwater depths to adapt to arid environments, while Tamarix spp. resisted the intensified drought by increasing water use efficiency.

中图分类号:

Q945.17

任志国, 陈亚鹏,李卫红,刘树宝. 地下水埋深对塔里木河下游建群种植物叶片δ¹³C值的影响[J]. 草业学报, 2014, 23(2): 76-82.

REN Zhi-guo, CHEN Ya-peng, LI Wei-hong, LIU Shu-bao. The effect of groundwater depth on the δ¹³C value of constructive species leaf in the lower reaches of the Tarim River[J]. Acta Prataculturae Sinica, 2014, 23(2): 76-82.

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地下水埋深对塔里木河下游建群种植物叶片δ¹³C值的影响

The effect of groundwater depth on the δ¹³C value of constructive species leaf in the lower reaches of the Tarim River

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