祁连山高寒草地甘肃臭草叶性状与坡向间的关系

doi:10.17521/cjpe.2015.0003

植物生态学报 ›› 2015, Vol. 39 ›› Issue (1): 23-31.DOI: 10.17521/cjpe.2015.0003

所属专题：青藏高原植物生态学：种群生态学；植物功能性状

祁连山高寒草地甘肃臭草叶性状与坡向间的关系

党晶晶, 赵成章^*(), 李钰, 侯兆疆, 董小刚

西北师范大学地理与环境科学学院, 甘肃省湿地资源保护与产业发展工程研究中心, 兰州 730070

收稿日期:2014-05-12 接受日期:2014-10-13 出版日期:2015-01-10 发布日期:2015-01-22
通讯作者: 赵成章
作者简介:
# 共同第一作者
基金资助:
基金项目国家林业局林业科技推广项目([2012]5号)、国家自然科学基金(91125014和40971039)和甘肃省科技支撑计划项目(1011FKCA157)

Relationship between leaf traits of Melica przewalskyi and slope aspects in alpine grassland of Qilian Mountains, China

DANG Jing-Jing, ZHAO Cheng-Zhang^*(), LI Yu, HOU Zhao-Jiang, DONG Xiao-Gang

Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China

Received:2014-05-12 Accepted:2014-10-13 Online:2015-01-10 Published:2015-01-22
Contact: Cheng-Zhang ZHAO
About author:
# Co-first authors

摘要/Abstract

摘要：

植物功能性状可反映植物对环境的适应。在祁连山高寒退化草地, 利用ArcGIS建立研究区域的数字高程模型, 提取坡向数据, 采用标准化主轴估计方法(standardized major axis estimation, SMA), 研究了不同坡向甘肃臭草(Melica przewalskyi)叶性状间的关系。结果表明: 1)甘肃臭草叶面积和叶体积在北坡最大, 东坡、西坡、南坡逐渐减小, 叶干质量无显著变化; 2)叶面积与叶干质量在北坡、东坡和西坡呈等速生长关系, 在南坡呈异速生长关系, 且叶干质量的增长速度大于叶面积的增长速度; 3)叶体积与叶干质量在4个坡向上呈异速生长关系, 且叶干质量的增长速度均小于叶体积的增长速度。甘肃臭草叶性状关系随坡向的变化反映了该物种在异质生境中具有较强的叶片形态可塑性, 从而有利于其适应和占据高寒退化生境。

关键词: 坡向, 叶面积, 叶干质量, 叶体积, 异速增长, 甘肃臭草

Abstract: <i>Aims</i>

Variations in leaf characteristics can reflect plant acclimation to environments. We aimed to examine the relationship between leaf traits of Melica przewalskyi and slope aspect.

<i>Methods</i>

In alpine grassland of Qilian Mountains, Gansu Province, China, 80 plots were sampled at intervals of 20 m along eight aspects. Latitude, longitude and altitude of each plot were recorded by GPS. At each plot, 10 individuals of M. przewalskyi were random selected and harvested for measurements of leaf mass, leaf area, and leaf volume. A digital elevation model (DEM) was constructed to extract elevation, aspect, and slope for each plot by ArcGIS. The 80 plots were divided into groups of north, east, west and south aspect. Values for leaf traits were log-transformed. the standardized major axis (SMA) estimation method, was used to examine the covariation among leaf traits.

Important findings

Leaf area and leaf volume decreased significantly as aspect turns from north to east, from east to west, and from west to south, but not so for leaf mass, suggesting that leaf thickness increased as slope aspect changes, and thus led to the smaller and thicker leaves on the south-facing slope than that on north-facing slope. A clear allometric relationship between leaf mass and leaf area was found only on the south-facing slope where increase in leaf mass was greater than that in leaf area. While on other slope aspects, an isometric relationships between them was observed. The allometric relationship between leaf mass and leaf volume was found on all four aspects, with the growing speed of leaf volume greater than that of leaf mass, and a rising SMA slope. We can conclude that variations in leaf traits of M. przewalskyi with slope aspect could reflect plant acclimation.

Key words: aspect, leaf area, leaf mass, leaf volume, allometry, Melica przewalskyi

党晶晶, 赵成章, 李钰, 侯兆疆, 董小刚. 祁连山高寒草地甘肃臭草叶性状与坡向间的关系. 植物生态学报, 2015, 39(1): 23-31. DOI: 10.17521/cjpe.2015.0003

DANG Jing-Jing,ZHAO Cheng-Zhang,LI Yu,HOU Zhao-Jiang,DONG Xiao-Gang. Relationship between leaf traits of Melica przewalskyi and slope aspects in alpine grassland of Qilian Mountains, China. Chinese Journal of Plant Ecology, 2015, 39(1): 23-31. DOI: 10.17521/cjpe.2015.0003

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图/表 4

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坡向 Slope aspect	盖度 Coverage (%)	高度 Height (cm)	地上生物量 Aboveground biomass (g·m^-2)	土壤水分含量 Soil moisture content (%)
北坡 North slope	72.97 ± 1.43^a	34.50 ± 1.74^a	100.18 ± 2.13^a	12.30 ± 0.56^a
东坡 East slope	70.17 ± 1.26^b	27.80 ± 1.32^b	97.66 ± 2.28^b	8.90 ± 0.38^b
西坡 West slope	68.14 ± 1.18^c	25.80 ± 1.16^b	94.78 ± 1.49^c	8.50 ± 0.37^b
南坡 South slope	64.75 ± 1.16^d	21.80 ± 0.87^c	92.23 ± 1.74^d	6.70 ± 0.24^c

坡向 Slope aspect	盖度 Coverage (%)	高度 Height (cm)	地上生物量 Aboveground biomass (g·m^-2)	土壤水分含量 Soil moisture content (%)
北坡 North slope	72.97 ± 1.43^a	34.50 ± 1.74^a	100.18 ± 2.13^a	12.30 ± 0.56^a
东坡 East slope	70.17 ± 1.26^b	27.80 ± 1.32^b	97.66 ± 2.28^b	8.90 ± 0.38^b
西坡 West slope	68.14 ± 1.18^c	25.80 ± 1.16^b	94.78 ± 1.49^c	8.50 ± 0.37^b
南坡 South slope	64.75 ± 1.16^d	21.80 ± 0.87^c	92.23 ± 1.74^d	6.70 ± 0.24^c

坡向 Slope aspects	叶面积 Leaf area (mm²)	叶体积 Leaf volume (mm³)	叶干质量 Leaf mass (mg)	比叶面积 Specific leaf area (mm²·mg^-1)
北坡 North slope	107.72 ± 2.73^a	11.38 ± 0.23^a	9.07 ± 0.18^a	11.88 ± 0.35^a
东坡 East slope	97.46 ± 2.16^b	10.86 ± 0.20^b	8.98 ± 0.20^a	10.85 ± 0.27^b
西坡 West slope	92.85 ± 1.41^c	9.11 ± 0.18^c	8.72 ± 0.16^a	10.65 ± 0.25^b
南坡 South slope	85.34 ± 1.02^d	7.86 ± 0.15^d	8.45 ± 0.14^a	10.10 ± 0.19^c

坡向 Slope aspects	叶面积 Leaf area (mm²)	叶体积 Leaf volume (mm³)	叶干质量 Leaf mass (mg)	比叶面积 Specific leaf area (mm²·mg^-1)
北坡 North slope	107.72 ± 2.73^a	11.38 ± 0.23^a	9.07 ± 0.18^a	11.88 ± 0.35^a
东坡 East slope	97.46 ± 2.16^b	10.86 ± 0.20^b	8.98 ± 0.20^a	10.85 ± 0.27^b
西坡 West slope	92.85 ± 1.41^c	9.11 ± 0.18^c	8.72 ± 0.16^a	10.65 ± 0.25^b
南坡 South slope	85.34 ± 1.02^d	7.86 ± 0.15^d	8.45 ± 0.14^a	10.10 ± 0.19^c

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祁连山高寒草地甘肃臭草叶性状与坡向间的关系

Relationship between leaf traits of Melica przewalskyi and slope aspects in alpine grassland of Qilian Mountains, China

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