干旱区生态环境知识资源中心(Arid): 基于稳定同位素技术的塔里木河下游不同林龄胡杨的水分利用来源

Arid

	基于稳定同位素技术的塔里木河下游不同林龄胡杨的水分利用来源
其他题名	Water utilization sources of Populus euphratica trees of different ages in the lower reaches of Tarim River
	张江; 李桂芳; 贺亚玲; 穆雨迪; 庄丽; 刘红玲
来源期刊	生物多样性
ISSN	1005-0094
出版年	2018
卷号	26 期号:6 页码:564-571
中文摘要	水分是制约很多陆地生态系统植物生长和繁殖的重要因素,在干旱地区尤为明显。利用稳定同位素技术探究塔里木河下游不同林龄胡杨(Populus euphratica)的水分来源情况,了解生态输水背景下荒漠河岸林的水分利用循环与利用策略,可为生态输水提供科学依据,同时也可对同类地区的生态恢复提供借鉴。本研究通过测定塔里木河下游胡杨茎干水和各潜在水源(土壤水、地下水)的稳定氢氧同位素值(deltaD、delta~(18)O),应用多源线性混合模型(IsoSource)分析了各潜在水源对不同林龄胡杨的贡献比例,并结合3种林龄胡杨不同土壤深度含水量的变化,分析了胡杨的主要吸水层位。结果表明:(1)不同林龄胡杨样地的不同深度区间上的土壤水delta~(18)O值存在显著差异(P < 0.05):胡杨幼龄木、成熟木、过熟木木质部delta~(18)O分别为-7.83 0.07、-8.53 0.11、-9.36 0.21;而deltaD值不存在显著差异(P > 0.05)。可据此来推断胡杨的主要吸水层位。(2)总体上,三种林龄胡杨土壤水delta~(18)O值随土壤深度增加而减小,并趋于接近地下水的delta~(18)O值。其中, 0-60 cm土壤水受蒸发影响比较大,其同位素组成经历了强烈的蒸发分馏过程,土壤含水量极少,土壤水delta~(18)O值偏正。(3)不同林龄胡杨所利用的水分来源不同:胡杨幼龄木对于地表80 cm以下的土壤水以及地下水均有一定程度的利用,对80-140 cm、140-220 cm和220-340 cm的土壤水平均利用比率依次为16.2%、21.4%和24.6%,对地下水平均利用比率为24.5%;成熟木主要利用220-340 cm的土壤水及地下水,平均利用比率分别为36.9%和42.3%;过熟木主要利用140-340 cm的土壤水及地下水,平均利用比率分别为32.8%和49.3%。
英文摘要	Water availability is one of the most important factors affecting the growth and reproduction of terrestrial plants, particularly in arid regions. Understanding the strategies of desert riparian plants to circulate and utilize water can reveal the scientific basis for ecological water conveyance engineering and contribute to planning ecological restoration of similar areas. In this study, we examined whether Populus euphratica trees of different ages in the lower reaches of Tarim River differed in their water sources by using the stable hydrogen and oxygen isotope technology. Specifically, for P. euphratica of different ages in the same habitat, we measured hydrogen and oxygen stable isotope ratios (deltaD and delta~(18)O) values of xylem water and potential water sources (soil moisture and ground water). Then, we used multi-isotope mass balance analysis (IsoSource) to calculate the possible contributions of potential water sources to the total water content in plants. We found significant differences of delta~(18)O value for soil moisture at different soil depths. Also, the delta~(18)O values of young wood (-7.83 0.07), mature wood (-8.53 0.11) and over-mature wood (-9.36 0.21), which were significantly different, while deltaD values did not differ statistically among the forest types. Furthermore, delta~(18)O values of P. euphratica in three kinds of forest age became lower while the distance was deeper from soil surface and gradually approached to ground water on the whole. The shallow soil water in 0-60 cm was significantly affected by evaporation. The isotopic composition of soil water had experienced a strong evaporation and fractionation process. And soil water content was small, while delta~(18)O values were large. Finally, our results showed that water utilization of P. euphratica of different ages came from different sources. The young wood of P. euphratica used an average of 16.2% of its water from 80-140 cm of the soil, 21.4% from 140-220 cm, and 24.6% from 220-340 cm and the average utilization ratio of ground water was 24.5%. In comparison, mature wood of P. euphratica mainly utilized the water from 220-340 cm of the soil and the ground water, with the utilization rate being 36.9% and 42.3%, respectively. Over-mature wood had water utilization ratios of 32.8% from 140-340 cm of soil and 49.3% of ground water.
中文关键词	氢氧稳定同位素 ; 水分利用来源 ; 土壤水 ; 林龄 ; 胡杨 ; 地下水
英文关键词	stable oxygen and hydrogen isotopes water utilization sources soil water forest age Populus euphratica ground water
类型	Article
语种	中文
国家	中国
开放获取类型	Bronze
收录类别	CSCD
WOS类目	Forestry
WOS研究方向	Forestry
CSCD记录号	CSCD:6287988
来源机构	石河子大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238220
作者单位	张江, 石河子大学生命科学学院, 新疆植物药资源利用教育部重点实验室, 石河子, 新疆 832003, 中国.; 李桂芳, 石河子大学生命科学学院, 新疆植物药资源利用教育部重点实验室, 石河子, 新疆 832003, 中国.; 庄丽, 石河子大学生命科学学院, 新疆植物药资源利用教育部重点实验室, 石河子, 新疆 832003, 中国.; 贺亚玲, 石河子大学医学院, 石河子, 新疆 832003, 中国.; 穆雨迪, 华东师范大学生命科学学院, 上海 200241, 中国.; 刘红玲, 成都师范学院化学与生命科学学院, 成都, 四川 610101, 中国.
推荐引用方式 GB/T 7714	张江,李桂芳,贺亚玲,等. 基于稳定同位素技术的塔里木河下游不同林龄胡杨的水分利用来源[J]. 石河子大学,2018,26(6):564-571.
APA	张江,李桂芳,贺亚玲,穆雨迪,庄丽,&刘红玲.(2018).基于稳定同位素技术的塔里木河下游不同林龄胡杨的水分利用来源.生物多样性,26(6),564-571.
MLA	张江,et al."基于稳定同位素技术的塔里木河下游不同林龄胡杨的水分利用来源".生物多样性 26.6(2018):564-571.