氢同位素在内蒙古小叶锦鸡儿灌丛水分来源研究中的应用

doi:10.17521/cjpe.2015.0018

植物生态学报 ›› 2015, Vol. 39 ›› Issue (2): 184-196.DOI: 10.17521/cjpe.2015.0018

所属专题：稳定同位素生态学

氢同位素在内蒙古小叶锦鸡儿灌丛水分来源研究中的应用

郑肖然^1,², 赵国琴², 李小雁^1,^2,^*(), 李柳², 吴华武², 张思毅², 张志华²

¹地表过程与资源生态国家重点实验室, 北京 100875
²北京师范大学资源学院, 北京 100875

收稿日期:2014-07-07 接受日期:2014-12-09 出版日期:2015-02-01 发布日期:2015-03-10
通讯作者: 李小雁
作者简介:
# 共同第一作者
基金资助:
国家自然科学基金(91425301和41321001)、国家杰出青年科学基金(41025001)、中央高校基本科研业务费资助项目(2012CXQT07)和长江学者和创新团队计划资助项目(IRT1108)

Application of stable hydrogen isotope in study of water sources for Caragana microphylla bushland in Nei Mongol

ZHENG Xiao-Ran^1,², ZHAO Guo-Qin², LI Xiao-Yan^1,^2,^*(), LI Liu², WU Hua-Wu², ZHANG Si-Yi², ZHANG Zhi-Hua²

¹State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
and ²College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China

Received:2014-07-07 Accepted:2014-12-09 Online:2015-02-01 Published:2015-03-10
Contact: Xiao-Yan LI
About author:
# Co-first authors

摘要/Abstract

摘要：

小叶锦鸡儿(Caragana microphylla)是我国内蒙古草原广泛分布的优势灌木, 目前国内外有关小叶锦鸡儿水分利用来源的定量研究较少。该文运用氢稳定同位素法, 分析了内蒙古小叶锦鸡儿木质部水和潜在水源(夏季降雨、冬季降雪和土壤水)的氢稳定同位素比率(δD)的季节变化, 发现小叶锦鸡儿在遮雨处理和自然状态下δD季节变化差异不明显, 分别为-101.36‰ ± 13.02‰和-101.18‰ ± 12.71‰。在遮雨处理条件下, 小叶锦鸡儿主要利用0-20 cm土壤层水分, 占其所利用水分的73.30% ± 16.14%; 自然状态下, 小叶锦鸡儿对0-20、20-60和60-100 cm不同土壤层土壤的水分利用较为均衡, 分别为34.66% ± 7.83%、32.44% ± 7.42%和32.90% ± 4.14%。该结果表明不同生境下灌木与草本的水分竞争可能是小叶锦鸡儿对不同土层水分利用差异的原因。结合两源模型分析了降雨对各土壤层的贡献率, 并用IsoSource多源混合模型分析了各土壤层对小叶锦鸡儿用水的贡献率, 发现降雨对小叶锦鸡儿的贡献率为42.65%-63.92%。该结果反映了小叶锦鸡儿对夏季降雨和冬季融雪的利用情况。

关键词: 用水来源, 氘同位素, 小叶锦鸡儿, 植物水分

Abstract: Aims

Caragana microphylla is a dominant shrub widely distributed in the grasslands of Nei Mongol. Its water utilization pattern has an important effect on local plant community composition. However, the water source for C. microphylla remains poorly quantified, which is vital in understanding the adaptation of this specie to arid environment. This study aims to investigate the dynamics of water use in C. microphylla and its response to soil water fluctuations resulting from precipitation pattern including summer rains and winter snow.

Methods

Seasonal variations of hydrogen stable isotope ratios (δD) in the xylem of C. microphylla and potential sources of water (summer rains, winter snow and soil water) were analyzed by LGR hydrogen stable isotope tracer method. The contribution of soil water to C. microphylla was calculated by IsoSource model and the contribution of rainfall to soil water was calculated by a two-source model.

Important findings

The xylem of C. microphylla (xylem) showed no seasonal differences in δD, whereas there were significant differences in the water source of plants between two contrasting hydrological environments. In habitats where rainfall was shielded off, C. microphylla mainly used the soil water at depth of 0-20 cm, which accounted for 73.30% ± 16.14% of the total water usage; whilst under natural conditions, water uptake by C. microphylla was more or less similar at the depths of 0-20 cm, 20-60 cm and 60-100 cm, accounting for 34.66% ± 7.83%, 32.44% ± 7.42%, 32.90% ± 4.14% of the total water usage, respectively. Competition for water between shrubs and grasses gave a possible explanation for different water utilization patterns of the plants. In addition, rainfall accounted for 42.65%-63.92% of the water sources for C. microphylla. Resultsin this study demonstrated that C. microphylla used both summer rains and winter snow, and dynamics of water use in C. microphylla reflects its adaptation to the water-limiting arid environment.

Key words: source of water use, deuterium isotope, Caragana microphylla, plant water use

郑肖然, 赵国琴, 李小雁, 李柳, 吴华武, 张思毅, 张志华. 氢同位素在内蒙古小叶锦鸡儿灌丛水分来源研究中的应用. 植物生态学报, 2015, 39(2): 184-196. DOI: 10.17521/cjpe.2015.0018

ZHENG Xiao-Ran,ZHAO Guo-Qin,LI Xiao-Yan,LI Liu,WU Hua-Wu,ZHANG Si-Yi,ZHANG Zhi-Hua. Application of stable hydrogen isotope in study of water sources for Caragana microphylla bushland in Nei Mongol. Chinese Journal of Plant Ecology, 2015, 39(2): 184-196. DOI: 10.17521/cjpe.2015.0018

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https://www.plant-ecology.com/CN/Y2015/V39/I2/184

图/表 11

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日期 Date (month-day)	降水量 Precipitation (mm)	降水强度 Precipitation intensity (mm·h^-1)	δD (‰)	月平均δD (平均值±标准偏差) Monthly average δD (‰) (mean ± SD)
6-9	6.6	0.2	-54.01	-48.20 ± 46.20
6-14	4.2	1.0	-5.89	-48.20 ± 46.20
7-8	15.6	1.2	-10.01	-42.80 ± 26.50
7-12	2.0	0.2	-38.47	-42.80 ± 26.50
8-8	6.2	3.6	-38.10	-50.84 ± 32.52

日期 Date (month-day)	降水量 Precipitation (mm)	降水强度 Precipitation intensity (mm·h^-1)	δD (‰)	月平均δD (平均值±标准偏差) Monthly average δD (‰) (mean ± SD)
6-9	6.6	0.2	-54.01	-48.20 ± 46.20
6-14	4.2	1.0	-5.89	-48.20 ± 46.20
7-8	15.6	1.2	-10.01	-42.80 ± 26.50
7-12	2.0	0.2	-38.47	-42.80 ± 26.50
8-8	6.2	3.6	-38.10	-50.84 ± 32.52

土壤深度 Soil depth (cm)	遮雨处理 Rain-exclusion treatment
土壤深度 Soil depth (cm)	日期 Date (month-day)
	4-20	6-11	6-15	7-8	7-14	8-9
0-5	-151.46 ± 17.39^a	-109.92 ± 30.98^a	-93.19 ± 35.33^a	-82.37 ± 6.97^a	-82.53 ± 18.76^a	-85.90 ± 4.45^a
5-10	-140.87 ± 27.79^a	-132.75 ± 34.01^a	-125.13 ± 22.85^a	-111.30 ± 1.96^ab	-96.05 ± 16.53^a	-97.08 ± 12.39^ab
10-20	-116.40 ± 5.83^abc	-144.64 ± 7.83^a	-137.39 ± 25.87^a	-124.57 ± 15.03^abc	-110.08 ± 36.13^a	-98.74 ± 16.74^ab
20-40	-89.31 ± 1.60^c	-163.35 ± 30.89^a	-148.37 ± 32.38^a	-152.23 ± 16.11^bc	-132.06 ± 9.74^b	-119.34 ± 22.01^abc
40-60	-92.37 ± 29.59^c	-154.73 ± 39.10^a	-143.87 ± 41.27^a	-155.80 ± 13.31^c	-142.22 ± 9.81^bc	-128.18 ± 17.92^bc
60-80	-101.28 ± 16.09^bc	-138.64 ± 42.40^a	-136.51 ± 37.99^a	-166.77 ± 21.93^c	-154.07 ± 0.23^c	-138.05 ± 12.59^c
80-100	-88.28 ± 13.99^c	-133.77 ± 29.10^a	-111.70 ± 14.02^a	-140.27 ± 18.60^b	-150.10 ± 10.17^c	-145.18 ± 0.42^c
总计 Total	-111.42 ± 28.30	-139.69 ± 28.91	-129.43 ± 30.40	-133.33 ± 30.28	-123.87 ± 29.85	-114.16 ± 23.93
土壤深度 Soil depth (cm)	自然状态 Natural condition
土壤深度 Soil depth (cm)	日期 Date (month-day)
	4-20	6-11	6-15	7-8	7-14	8-9
0-5	-161.74 ± 1.21^a	-80.65 ± 11.33^a	-46.96 ± 14.16^a	-44.55 ± 7.54^a	-39.07 ± 4.72^a	-73.09 ± 3.86^a
5-10	-145.11 ± 7.93^a	-116.48 ± 0.62^b	-82.27 ± 16.08^ab	-55.23 ± 22.23^a	-58.54 ± 18.07^ab	-83.77 ± 0.03^ab
10-20	-129.67 ± 41.18^a	-143.01 ± 12.45^c	-108.05 ± 23.09^b	-75.70 ± 19.69^ab	-80.23 ± 14.00^bc	-80.38 ± 18.94^a
20-40	-143.43 ± 33.96^a	-135.82 ± 8.17^c	-100.7 ± 20.72^b	-119.97 ± 19.88^c	-109.48 ± 9.59^c	-113.12 ± 21.33^b
40-60	-137.41 ± 38.22^a	-111.21 ± 3.98^b	-103.35 ± 32.47^b	-124.08 ± 16.14^c	-115.16 ± 30.70^c	-103.35 ± 16.54^ab
60-80	-106.92 ± 32.80^a	-103.74 ± 8.42^b	-93.11 ± 8.75^ab	-115.80 ± 10.20^bc	-100.41 ± 13.57^c	-91.16 ± 4.62^ab
80-100	-111.89 ± 21.70^a	-109.07 ± 5.05^b	-87.31 ± 17.86^ab	-129.67 ± 20.34^c	-92.01 ± 8.95^bc	-100.55 ± 0.26^ab
总计 Total	-135.54 ± 28.58	-114.28 ± 20.77	-88.82 ± 24.72	-95.00 ± 36.50	-84.59 ± 30.37	-92.24 ± 17.18

土壤深度 Soil depth (cm)	遮雨处理 Rain-exclusion treatment
土壤深度 Soil depth (cm)	日期 Date (month-day)
	4-20	6-11	6-15	7-8	7-14	8-9
0-5	-151.46 ± 17.39^a	-109.92 ± 30.98^a	-93.19 ± 35.33^a	-82.37 ± 6.97^a	-82.53 ± 18.76^a	-85.90 ± 4.45^a
5-10	-140.87 ± 27.79^a	-132.75 ± 34.01^a	-125.13 ± 22.85^a	-111.30 ± 1.96^ab	-96.05 ± 16.53^a	-97.08 ± 12.39^ab
10-20	-116.40 ± 5.83^abc	-144.64 ± 7.83^a	-137.39 ± 25.87^a	-124.57 ± 15.03^abc	-110.08 ± 36.13^a	-98.74 ± 16.74^ab
20-40	-89.31 ± 1.60^c	-163.35 ± 30.89^a	-148.37 ± 32.38^a	-152.23 ± 16.11^bc	-132.06 ± 9.74^b	-119.34 ± 22.01^abc
40-60	-92.37 ± 29.59^c	-154.73 ± 39.10^a	-143.87 ± 41.27^a	-155.80 ± 13.31^c	-142.22 ± 9.81^bc	-128.18 ± 17.92^bc
60-80	-101.28 ± 16.09^bc	-138.64 ± 42.40^a	-136.51 ± 37.99^a	-166.77 ± 21.93^c	-154.07 ± 0.23^c	-138.05 ± 12.59^c
80-100	-88.28 ± 13.99^c	-133.77 ± 29.10^a	-111.70 ± 14.02^a	-140.27 ± 18.60^b	-150.10 ± 10.17^c	-145.18 ± 0.42^c
总计 Total	-111.42 ± 28.30	-139.69 ± 28.91	-129.43 ± 30.40	-133.33 ± 30.28	-123.87 ± 29.85	-114.16 ± 23.93
土壤深度 Soil depth (cm)	自然状态 Natural condition
土壤深度 Soil depth (cm)	日期 Date (month-day)
	4-20	6-11	6-15	7-8	7-14	8-9
0-5	-161.74 ± 1.21^a	-80.65 ± 11.33^a	-46.96 ± 14.16^a	-44.55 ± 7.54^a	-39.07 ± 4.72^a	-73.09 ± 3.86^a
5-10	-145.11 ± 7.93^a	-116.48 ± 0.62^b	-82.27 ± 16.08^ab	-55.23 ± 22.23^a	-58.54 ± 18.07^ab	-83.77 ± 0.03^ab
10-20	-129.67 ± 41.18^a	-143.01 ± 12.45^c	-108.05 ± 23.09^b	-75.70 ± 19.69^ab	-80.23 ± 14.00^bc	-80.38 ± 18.94^a
20-40	-143.43 ± 33.96^a	-135.82 ± 8.17^c	-100.7 ± 20.72^b	-119.97 ± 19.88^c	-109.48 ± 9.59^c	-113.12 ± 21.33^b
40-60	-137.41 ± 38.22^a	-111.21 ± 3.98^b	-103.35 ± 32.47^b	-124.08 ± 16.14^c	-115.16 ± 30.70^c	-103.35 ± 16.54^ab
60-80	-106.92 ± 32.80^a	-103.74 ± 8.42^b	-93.11 ± 8.75^ab	-115.80 ± 10.20^bc	-100.41 ± 13.57^c	-91.16 ± 4.62^ab
80-100	-111.89 ± 21.70^a	-109.07 ± 5.05^b	-87.31 ± 17.86^ab	-129.67 ± 20.34^c	-92.01 ± 8.95^bc	-100.55 ± 0.26^ab
总计 Total	-135.54 ± 28.58	-114.28 ± 20.77	-88.82 ± 24.72	-95.00 ± 36.50	-84.59 ± 30.37	-92.24 ± 17.18

土壤深度 Soil depth (cm)	日期 Date (month-day)					平均值 Mean
土壤深度 Soil depth (cm)	6-11	6-15	7-8	7-14	8-9	平均值 Mean
0-5	76.22%	74.36%	77.87%	99.53%	72.65%	80.13%
5-10	44.25%	52.31%	71.02%	84.27%	64.31%	63.23%
10-20	20.57%	36.21%	57.90%	75.03%	66.96%	51.33%
20-40	26.99%	40.80%	29.53%	44.34%	41.37%	36.61%
40-60	48.95%	39.15%	26.90%	39.89%	39.87%	38.95%
60-80	55.62%	45.54%	32.21%	51.45%	58.53%	48.67%
80-100	50.86%	49.16%	23.32%	58.03%	51.19%	46.51%

氢同位素在内蒙古小叶锦鸡儿灌丛水分来源研究中的应用

Application of stable hydrogen isotope in study of water sources for Caragana microphylla bushland in Nei Mongol

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