中国区域478种C3植物叶片碳稳定性同位素组成与水分利用效率

doi:10.3724/SP.J.1258.2011.00119

摘要/Abstract

摘要：

目前, 在中国区域关于植物碳稳定性同位素组成(δ¹³C)已经有了很多的研究, 同时, δ ¹³C作为植物水分利用效率(WUE)的替代指标, 得到了越来越广泛的应用。而这些研究多集中在站点或小的区域尺度, 那么在整个中国区域尺度上, δ¹³C能否作为植物WUE的替代指标值得探讨。该文通过对文献资料的收集整理, 研究了中国区域187个采样点478种C₃植物叶片的δ¹³C, 统计分析结果表明δ¹³C的变化范围为-33.50‰- -22.00‰, 均值为-(27.10 ± 1.70)‰。在乔木、灌木和草本3种不同的生活型间, 叶片δ¹³C的差异达到极显著水平, 其中以草本的δ¹³C最高, 乔木最低, 这与在站点或小的区域尺度上的研究结果不同。对不同系统发育类型的植物而言, 种子植物的δ¹³C极显著地大于蕨类植物; 祼子植物与被子植物间的差异未达到显著水平; 单子叶植物极显著地大于双子叶植物。叶片δ¹³C值随经度的变化没有明显的规律, 但是随纬度的增加, δ ¹³C极显著地升高。随年均温度和年均降雨量的降低, 叶片δ¹³C值极显著升高。年均降雨量与δ¹³C间的这种极显著的负相关关系, 与WUE和降水量间的关系一致, 这表明在大的区域尺度上, δ¹³C可以作为植物WUE的指示指标。

关键词: C₃植物, 生活型, 降雨量, 稳定性同位素, 水分利用效率

Abstract:

Aims There have been many studies of carbon isotope composition (δ¹³C) of C₃ plants in China, and δ¹³C has been widely used as an index of water use efficiency (WUE); however, most studies focused on single sites or small regions. Therefore, our objective was to study the spatial pattern of δ¹³C, the relationships between δ ¹³C and climate factors and whether δ ¹³C can represent WUE in large regions.
Methods We obtained leaf δ ¹³C for 478 C₃ species from 187 sites in China based on the literature.
Important findings The range of δ¹³C was from -33.50‰ to -22.00‰, and the mean was -(27.10‰ ± 1.70)‰. There were significant differences among δ¹³C of grasses, shrubs and trees, with grasses having the highest value and trees the lowest. The result was different from studies in single sites and small regions. For different phylogenic plants, δ ¹³C of seed plants was significantly higher than ferns, the difference between gymnosperms and angiosperms was not statistically significant and monocotyledons had significantly higher values than dicotyledons. Leaf δ ¹³C had irregular variation with increasing longitude, but significantly increased with increasing latitude. Leaf δ ¹³C significantly increased with mean annual temperature and decreasing mean annual precipitation. The relationship between δ ¹³C and precipitation was similar to that of WUE and precipitation, so we conclude that δ ¹³C of C₃ plants can be used as an index of WUE in large regions as well as in single sites or small regions.

Key words: C₃ plant, life-form, precipitation, stable isotope, water use efficiency

任书杰, 于贵瑞. 中国区域478种C₃植物叶片碳稳定性同位素组成与水分利用效率. 植物生态学报, 2011, 35(2): 119-124. DOI: 10.3724/SP.J.1258.2011.00119

REN Shu-Jie, YU Gui-Rui. Carbon isotope composition (δ¹³C) of C₃ plants and water use efficiency in China. Chinese Journal of Plant Ecology, 2011, 35(2): 119-124. DOI: 10.3724/SP.J.1258.2011.00119

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2011.00119

https://www.plant-ecology.com/CN/Y2011/V35/I2/119

图/表 6

图1 中国区域187个采样点分布图。审图号: GS(2010)1351号

Fig. 1 Distribution of 187 sample sites in China.

图2 中国区域478种C3植物叶片碳稳定同位素组成(δ13C)的频率分布图。

Fig. 2 Histogram of leaf carbon isotope composition (δ13C) of 478 C3 species in China.

表1 不同生活型植物叶片碳稳定性同位素组成(δ13C)的比较

Table 1 Comparison of leaf carbon isotope composition (δ13C) between different life-form plants

生活型 Life form	均值 Mean (‰)	差异 Difference	物种数 No. of species
草本 Grass	-(26.81 ± 1.53)	A	341
灌木 Shrub	-(27.50 ± 1.91)	B	86
乔木 Tree	-(28.30 ± 1.75)	C	51

表2 不同系统发育植物叶片碳稳定性同位素组成(δ13C)的比较

Table 2 Comparison of leaf carbon isotope composition (δ13C) between different phylogenic plants

系统发育类型 Phylogenic type	均值 Mean (‰)	差异 Difference	物种数 No. of species
种子植物 Seed plant	- (27.07 ± 1.68)	A	473
蕨类植物 Fern	-(29.99 ± 1.41)	B	5
裸子植物 Gymnosperm	(-26.39 ± 2.41)	a	10
被子植物 Angiosperm	(-27.08 ± 1.66)	a	463
单子叶植物 Monocotyledon	(-26.37 ± 1.70)	A	86
双子叶植物 Dicotyledon	(-27.24 ± 1.61)	B	377

图3 中国区域C3植物叶片碳稳定性同位素组成(δ13C)的空间分布格局。经度, y = 0.0036x - 27.273 (R2 = 0.000 5, n = 791); 纬度, y = 0.0965x - 30.562 (R2 = 0.123 5, n =791); 年平均温度, y = -0.0812x - 26.561 (R2 = 0.104 5, n = 791); 年平均降雨量, y = -0.002x - 25.977 (R2 = 0.173, n = 791)。

Fig. 3 Spatial pattern of leaf carbon isotope composition (δ13C) of C3 species in China. MAT, mean annual air temperature; MAP, mean annual precipitation. Longitude, y = 0.003 6x - 27.273 (R2 = 0.000 5, n = 791); latitude, y = 0.096 5x - 30.562 (R2 = 0.123 5, n = 791); MAT, y = -0.081 2x - 26.561 (R2 = 0.104 5, n = 791); MAP, y = -0.002x - 25.977 (R2 = 0.173, n = 791).

表3 不同生活型植物样点分布情况比较

Table 3 Comparison of sample sites distribution about different life-form plants

生活型 Life form	纬度 Latitude	年均温 MAT	年均降雨量 MAP	物种数 No. of species
乔木 Tree	32.62^C	9.89^A	780.15^A	117
灌木 Shrub	35.42^B	8.93^A	549.88^B	228
草本 Grass	38.92^A	2.06^B	389.99^C	603

参考文献 23

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中国区域478种C₃植物叶片碳稳定性同位素组成与水分利用效率

Carbon isotope composition (δ¹³C) of C₃ plants and water use efficiency in China

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