| 甘肃省扎尕梁北坡头花杜鹃枝叶性状特征北大核心CSCD |
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| 引用本文： | 杨克彤,陈国鹏,鲜骏仁,俞筱押,张金武,王立.甘肃省扎尕梁北坡头花杜鹃枝叶性状特征北大核心CSCD[J].草业学报,2022,31(2):111-120. |
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| 作者姓名： | 杨克彤 陈国鹏 鲜骏仁 俞筱押 张金武 王立 |
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| 作者单位： | 1.甘肃农业大学林学院，甘肃 兰州 730070;2.四川农业大学环境学院，四川 成都 611130;3.黔南民族师范学院旅游与资源环境学院，贵州 都匀 558000 |
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| 基金项目： | 国家自然科学基金(31800352);甘肃省高等学校科研项目(2017A-032);全国和甘肃省大学生创新创业训练计划项目(202010733027,201710733029,2017-500)资助。 |
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| 摘 要： | 高山植物在适应高海拔、低气压、短生长季等环境约束的过程中表现出独特的功能适应性,探究高山植物枝叶功能性状沿海拔梯度的变化特征对其资源获取与生存繁殖的认知有重要意义。于2019年8月对甘南高山海拔3400~3700 m范围内头花杜鹃23组主要枝叶功能性状进行了测定。研究发现:随海拔上升,叶干物质含量、叶片密度、叶厚度和总叶干物质含量显著增大;叶长、叶宽、叶面积、叶体积、叶干重、茎长、茎干重、总叶干重、总叶面积、纤细率和茎体积在3600 m显著减小,在海拔梯度上整体呈"V"形变化;海拔会显著影响叶厚、叶长、叶干物质含量、叶密度、比叶面积、总叶干物质含量、总叶面积和总比叶面积,大部分性状间存在显著的相关关系;头花杜鹃枝叶性状在海拔内的方差分量明显大于海拔间,各性状的表型分化系数以茎干物质含量最小(3.19%),叶密度最大(57.73%),平均为20.65%。结果表明:头花杜鹃部分性状对海拔变化不敏感,主要以少数核心性状变异结合功能性状组合共同适应高山异质生境,头花杜鹃在海拔间具有较低的表型变异,可能是对高山特殊环境的适应性策略。
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| 关 键 词： | 高山 功能性状 海拔 表型分化 头花杜鹃 |
| 收稿时间： | 2020-12-02 |
| 修稿时间： | 2021-01-27 |
Characteristics of stem and leaf functional traits of Rhododendron capitatum on the north slope of Zhagaliang,Gansu |
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| YANG Ke-tong,CHEN Guo-peng,XIAN Jun-ren,YU Xiao-ya,ZHANG Jin-wu,WANG Li.Characteristics of stem and leaf functional traits of Rhododendron capitatum on the north slope of Zhagaliang,Gansu[J].Acta Prataculturae Sinica,2022,31(2):111-120. |
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| Authors: | YANG Ke-tong CHEN Guo-peng XIAN Jun-ren YU Xiao-ya ZHANG Jin-wu WANG Li |
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| Institution: | 1.College of Forestry，Gansu Agricultural University，Lanzhou 730070，China;2.College of Environmental Sciences，Sichuan Agricultural University，Chengdu 611130，China;3.School of Tourism and Resource Environment，Qiannan Normal College for Nationalities，Duyun 558000，China |
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| Abstract: | Alpine plants show unique functional plasticity in the process of adapting to environmental constraints such as high altitude， low atmospheric pressure and a short growing season. This research explored the morphological variation in twigs and leaves of Rhododendron capitatum along an altitude gradient to evaluate the functional significance of this variation for resource acquisition， survival and reproduction. In August 2019， various leaf and twig traits of 23 groups of R.capitatum were measured at altitudes from 3400-3700 m. It was found that with increase in altitude， the leaf dry matter content （LDMC）， density （LDE）， thickness （LT） and total leaf dry matter content （TLDMC） were increased. Leaf length （LL）， width （LW）， area （LA）， volume （LV）， dry weight （LDW）， stem length （SL）， stem dry weight （SDW）， total leaf dry weight （TLDW）， total leaf area （TLA）， stem slender ratio （SSR） and stem volume （SV） showed a “V” shaped altitudinal trend with the lowest values at around 3600 m altitude. Higher altitude significantly increased thickness （LT）， dry matter content （LDMC）， density （LDE）， but significantly decreased specific leaf area （SLA）， total leaf area （TLA） and total specific leaf area （TSLA）， respectively. There were significant correlations between most measured traits. The variance components of leaf traits between R. capitatum plants growing at the same altitude were significantly higher than those between plants at different altitudes. The smallest coefficient of phenotypic differentiation of twigs and leaves was 3.19% for stem dry matter content （SDMC）， the largest was 57.73% for leaf density （LDE）， and the average across traits was 20.65%. The results show that some traits of R. capitatum are not sensitive to elevation changes， and that a few key traits like leaf area （LA）， specific leaf area （SLA）， leaf dry matter content （LDMC） and leaf density （LDE） act as functional traits to adapt to alpine habitats. R. capitatum showed lower phenotypic variation among plants along elevation gradients than among plants at the same altitude. |
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| Keywords: | alpine functional traits altitude phenotype differentiation Rhododendron capitatum |
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