毛乌素沙地油蒿叶建成成本及相关叶性状沿降水梯度的变化

doi:10.17521/cjpe.2019.0149

植物生态学报 ›› 2019, Vol. 43 ›› Issue (11): 979-987.DOI: 10.17521/cjpe.2019.0149

毛乌素沙地油蒿叶建成成本及相关叶性状沿降水梯度的变化

张治国¹,魏海霞^1,^2,^3,^*()

¹枣庄学院旅游与资源环境学院, 山东枣庄 277160
²中国科学院青藏高原研究所高寒生态学与生物多样性重点实验室, 北京 100101
³中国林业科学研究院荒漠化研究所, 北京 100091

收稿日期:2019-06-18 接受日期:2019-11-15 出版日期:2019-11-20 发布日期:2020-03-26
通讯作者: 魏海霞
基金资助:
国家自然科学基金(41301047);中国博士后科学基金(2014M561076)

Variations of leaf construction cost and leaf traits within the species of Artemisia ordosica along a precipitation gradient in the Mau Us sandy land

ZHANG Zhi-Guo¹,WEI Hai-Xia^1,^2,^3,^*()

¹Department of Tourism and Resource Environment, Zaozhuang University, Zaozhuang, Shandong 277160, China
²Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
³Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China

Received:2019-06-18 Accepted:2019-11-15 Online:2019-11-20 Published:2020-03-26
Contact: WEI Hai-Xia
Supported by:
Supported by the National Natural Science Foundation of China(41301047);the China Postdoctoral Science Foundation(2014M561076)

摘要/Abstract

摘要：

干旱区植物在如何提高水分利用效率与降低叶建成成本之间可能存在一种权衡。我们假设: 与湿润区植物相比, 干旱区植物能通过调节叶功能性状之间的关系(如通过提高单位面积叶氮含量(N_area)), 实现在相同的叶建成成本下具有更高的水分利用效率。为了验证这一假设, 该研究以毛乌素沙地的广布物种油蒿(Artemisia ordosica)为研究对象, 分析了油蒿叶建成成本沿降水梯度的变化规律及其与比叶面积(SLA)、单位质量叶氮含量(N_mass)、N_area和叶碳稳定同位素比率(δ ¹³C)的关系。结果表明: 油蒿单位质量叶建成成本(CC_m)在不同降水条件下差异不显著, 而单位面积叶建成成本(CC_a)在不同降水条件下虽有显著差异, 但并未随降水减少而明显增加。油蒿CC_m与SLA无显著相关性, 与叶δ ¹³C值呈显著正相关关系。油蒿叶建成成本与N_area呈显著正相关关系, 但这种关系格局在低降水量(264 mm)区与高降水量(310-370 mm)区之间存在策略位移现象——即在相同叶建成成本下, 低降水量区植物比高降水量区植物具有更高的N_area。以上结果表明, 尽管高水分利用效率与高叶建成成本相关, 但与高降水量区植物相比, 低降水量区植物具有较高的N_area并没有导致其叶建成成本增加。

关键词: 毛乌素沙地, 油蒿, 降水梯度, 叶建成成本, 策略位移现象

Abstract:

Aims There would be a trade-off between enhancing water use efficiency and decreasing leaf construction cost in arid plants. We hypothesized that plants in lower precipitation areas could have higher water use efficiency at a given leaf construction cost compared to plants in higher precipitation areas by altering relationships between leaf functional traits (i.e. increasing area-based leaf nitrogen concentration, N_area).Methods Artemisia ordosica is a widespread species in the Mau Us sandy land. Variations of leaf construction cost of A. ordosica along a precipitation gradient and its relationships to other leaf traits such as specific leaf area (SLA), mass-based leaf nitrogen concentration (N_mass), N_area and leaf stable carbon isotopes ratio (δ ¹³C) value were analyzed.Important findings There were no significant differences in mass-based leaf construction cost (CC_m) among different precipitation areas. Although area-based leaf construction cost (CC_a) showed significant differences among different precipitation areas, they did not increase significantly with decreasing precipitation. The relationship between CC_m and SLA was not significant while CC_m positively correlated with leaf δ ¹³C value. There was a strategy shift in the positive relationship of leaf construction cost to N_area between plant-groups in the lowest precipitation (264 mm) areas and other higher precipitation (310-370 mm) areas, i.e. plants from low precipitation areas have higher N_area at a given leaf construction cost. Our results indicated that although high water use efficiency was accompanied by high leaf construction cost, the high N_area for plants from lower precipitation areas did not increase their leaf construction cost.

Key words: Mau Us sandy land, Artemisia ordosica, rainfall gradient, leaf construction cost, strategy shift

张治国, 魏海霞. 毛乌素沙地油蒿叶建成成本及相关叶性状沿降水梯度的变化. 植物生态学报, 2019, 43(11): 979-987. DOI: 10.17521/cjpe.2019.0149

ZHANG Zhi-Guo, WEI Hai-Xia. Variations of leaf construction cost and leaf traits within the species of Artemisia ordosica along a precipitation gradient in the Mau Us sandy land. Chinese Journal of Plant Ecology, 2019, 43(11): 979-987. DOI: 10.17521/cjpe.2019.0149

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2019.0149

https://www.plant-ecology.com/CN/Y2019/V43/I11/979

图/表 6

表1 毛乌素沙地研究点气候和土壤特征

Table 1 Climatic and soil characteristics of study sites in the Mau Us sandy land

	经度 Longitude	纬度 Latitude	海拔 Altitude (m)	年降水量 Annual precipitation (mm)	年蒸发量 Annual pan-evaporation (mm)	年平均气温 Annual mean temperature (℃)	土壤全氮含量 Soil total N concentration (mg·g^-1)
	经度 Longitude	纬度 Latitude	海拔 Altitude (m)	年降水量 Annual precipitation (mm)	年蒸发量 Annual pan-evaporation (mm)	年平均气温 Annual mean temperature (℃)	固定沙地 Fixed sandy land	半固定沙地 Semi-fixed sandy land
榆林 Yulin	109.87°	38.62°	1 210	370	1 890	8.6	0.28 ± 0.049^aBC	0.18 ± 0.075^bA
乌审旗 Uxin Qi	108.64°	38.16°	1 270	353	2 322	8.7	0.24 ± 0.012^aC	0.07 ± 0.016^bB
鄂托克前旗 Otog Qianqi	108.46°	37.70°	1 320	310	2 133	8.8	0.32 ± 0.052^aAB	0.19 ± 0.038^bA
鄂托克旗 Otog Qi	108.06°	39.06°	1 420	264	2 450	7.6	0.37 ± 0.039^aA	0.19 ± 0.018^bA

图1 沿降水梯度油蒿叶片单位质量建成成本与热值(A)、灰分含量(B)和单位质量叶氮含量(C)的关系。

Fig. 1 Relationships between mass-based leaf construction cost and heat of combustion (A), ash content (B) and mass-based leaf nitrogen concentration (C) of leaves within species of Artemisia ordosica along a precipitation gradient.

图2 不同沙地生境和降水条件下油蒿叶片单位质量建成成本(A)和单位面积建成成本(B)的比较(平均值+标准偏差)。不同大写字母表示建成成本在不同降水条件下差异显著(p < 0.05); 不同小写字母表示建成成本在沙地生境间差异显著(p < 0.05)。

Fig. 2 Comparisons of mass-based leaf construction cost (A) and area-based leaf construction cost (B) of Artemisia ordosica between two sandy land habitats and among different precipitation areas (mean + SD). Different uppercase letters indicate significant differences in leaf construction cost among different precipitation areas; different lowercase letters indicate significant differences in leaf construction cost between two sandy land habitats.

表2 沿降水梯度油蒿叶片单位质量建成成本(CCm)和单位面积建成成本(CCa)与降水和土壤全氮含量的偏相关分析

Table 2 Partial correlation coefficients for relationships of mass-based leaf construction cost (CCm) and area-based leaf construction cost (CCa) to annual precipitation and total soil nitrogen content within species of Artemisia ordosica along a precipitation gradient

因变量 Dependent variables	土壤全氮含量 Soil total nitrogen content (mg·g^-1)	年降水量 Annual precipitation (mm)
CC_m	0.28^*	0.03
CC_a	0.27^*	0.32^*

图3 沿降水梯度油蒿叶片单位质量建成成本和单位面积建成成本与比叶面积(A、B)、单位面积叶氮含量(C、D)和叶碳稳定同位素比率(δ13C)(E、F)的关系。

Fig. 3 Relationships of mass-based leaf construction cost and area-based leaf construction cost to specific leaf area (A, B), area-based leaf nitrogen concentration (C, D) and leaf stable carbon isotopes ratio (δ13C) value (E, F) within species of Artemisia ordosica along a precipitation gradient.

图4 沿降水梯度青藏高原北部沙地油蒿叶片单位质量建成成本(A)和单位面积建成成本(B)与单位面积叶氮含量的关系。

Fig. 4 Relationships of mass-based leaf construction cost (A) and area-based leaf construction cost (B) to area-based leaf nitrogen concentration within species of Artemisia ordosica along a precipitation gradient in the sandy lands of the northern Qinghai-Xizang Plateau.

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毛乌素沙地油蒿叶建成成本及相关叶性状沿降水梯度的变化

Variations of leaf construction cost and leaf traits within the species of Artemisia ordosica along a precipitation gradient in the Mau Us sandy land

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