大兴安岭泥炭地植物叶片碳氮磷含量及其化学计量学特征
收稿日期: 2018-08-27
修回日期: 2018-12-03
网络出版日期: 2019-04-04
基金资助
国家自然科学基金(41471056);国家自然科学基金(41522301);国家自然科学基金(41730855);国家重点研发计划(2016YFA0600802)
Leaf C, N, and P concentrations and their stoichiometry in peatland plants of Da Hinggan Ling, China
Received date: 2018-08-27
Revised date: 2018-12-03
Online published: 2019-04-04
Supported by
Supported by the National Natural Science Foundation of China(41471056);Supported by the National Natural Science Foundation of China(41522301);Supported by the National Natural Science Foundation of China(41730855);the National Key R & D Program of China(2016YFA0600802)
叶片碳(C)、氮(N)、磷(P)含量及其化学计量特征为植物养分状况和元素限制性提供依据。为了解不同生活型植物叶片C、N、P化学计量特征的变化,该研究测定、分析了大兴安岭地区18个泥炭地常见的3种草本植物——白毛羊胡子草(Eriophorum vaginatum)、玉簪薹草(Carex globularis)、小叶章(Deyeuxia angustifolia), 5种落叶灌木——柴桦(Betula fruticosa)、越桔柳(Salix myrtilloides)、细叶沼柳(Salix rosmarinifolia)、笃斯越桔(Vaccinium uliginosum)、越桔(Vaccinium vitis-idaea)和3种常绿灌木——杜香(Ledum palustre)、地桂(Chamaedaphne calyculata)、头花杜鹃(Rhododendron capitatum)的叶片C、N、P含量。结果表明: (1)落叶和常绿灌木叶片C、N、P含量总体高于草本植物而C:N、C:P、N:P低于草本植物, 说明不同生活型植物具有不同的养分利用策略,灌木叶片C、N、P储存高于草本植物而N、P利用效率低于草本植物; (2)小叶章和头花杜鹃叶片N:P小于10, 同时其N含量小于全球植物叶片平均N含量, 相比其他植物来说更易受N限制; (3)采样地点解释了叶片C、N、P指标变异的12.8%-40.8%, 植物种类对叶片C、N、P指标变异的解释量占9.3%-25.5%; (4)草本植物C、N、P指标的地点间变异系数高于落叶和常绿灌木, 草本植物C、N、P指标对地点因素变化的响应较灌木敏感; (5)草本植物N含量种间变异系数高于落叶和常绿灌木, 落叶灌木P含量种间变异系数高于草本植物和常绿灌木, 草本植物和落叶灌木N、P吸收的种间生理分化较常绿灌木高。
李瑞, 胡朝臣, 许士麒, 吴迪, 董玉平, 孙新超, 毛瑢, 王宪伟, 刘学炎 . 大兴安岭泥炭地植物叶片碳氮磷含量及其化学计量学特征[J]. 植物生态学报, 2018 , 42(12) : 1154 -1167 . DOI: 10.17521/cjpe.2018.0214
Aims Leaf carbon (C), nitrogen (N), and phosphorus (P) concentrations and their stoichiometry can provide a basis for plant nutrient status and element limitation. Our objective was to explore variations of leaf C:N:P stoichiometry in plants of different growth forms.
Methods We analyzed leaf C, N, and P concentrations in three graminoids (Eriophorum vaginatum, Carex globularis, Deyeuxia angustifolia), five deciduous shrubs (Betula fruticosa, Salix myrtilloides, Salix rosmarinifolia, Vaccinium vitis-idaea, Vaccinium uliginosum), and three evergreen shrubs (Ledum palustre, Chamaedaphne calyculata, Rhododendron capitatum) across 18 peatland sites in the Da Hinggan Ling, northeastern China.
Important findings (1) Leaf C, N, and P concentrations were higher, and the leaf C:N, C:P, and N:P values were lower, in deciduous and evergreen shrubs than in graminoids, indicating that plants of different growth forms had different nutrient utilization strategies. Shrubs had higher C, N and P storage and lower N and P use efficiency than graminoids. (2) Leaf N:P values in Deyeuxia angustifolia and R. capitatum were less than 10, and their leaf N concentrations were lower than the global mean leaf N concentration, indicating that those species were limited by N more than other plants. (3) The sampling sites explained 12.8%-40.8% of the variations in leaf C, N, and P stoichiometry, and plant species explained 9.3%-25.5%. (4) Graminoids had greater inter-site coefficient of variance (CV) values in leaf C, N, and P variables than deciduous and evergreen shrubs, indicating greater sensitive to site factors. (4) The inter-species CV values in leaf N were greater in graminoids than in deciduous and evergreen shrubs, and the inter-species CV values in leaf P were greater in deciduous shrubs than in graminoids and evergreen shrubs, indicating greater physiological differentiation in N and P use strategies in graminoids and deciduous shrubs than in evergreen shrubs.
Key words： Da Hinggan Ling; northern peatland; plant nutrition; stoichiometry
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