贺兰山西坡不同生活型植物叶片化学计量特征及其环境影响因子分析  

Leaf stoichiometric characteristics of different life form plants on the western slope of Helan Mountain and analysis on their environmental impact factors

作　　者：晁鑫艳 卫玺玺 郑景明[1] 唐可欣 万龙 周金星[2] CHAO Xinyan;WEI Xixi;ZHENG Jingming;TANG Kexin;WAN Long;ZHOU Jinxing(Beijing Forestry University:College of Ecology and Nature Conservation,Beijing 100083,China;Beijing Forestry University College of Soil and Water Conservation,Beijing 100083,China)

机构地区：[1]北京林业大学生态与自然保护学院,北京100083 [2]北京林业大学水土保持学院,北京100083

出　　处：《植物资源与环境学报》2023年第6期22-33,共12页Journal of Plant Resources and Environment

基　　金：宁夏重点研发计划项目(2021BEG02005)。

摘　　要：在贺兰山西坡海拔1848~2707 m范围内选取典型植物群落的乔木、灌木和草本优势种,对不同生活型植物叶片C、N和P含量及比值进行比较,并对这些化学计量指标与14个环境因子的关系进行分析。结果表明:总体叶片C、N和P含量分别为431.58、15.66和1.79 mg·g^(-1),C∶N、C∶P和N∶P分别为28.62、254.87和9.11。其中,乔木叶片C含量显著(P<0.05)高于灌木和草本,灌木叶片C∶N显著低于草本和乔木,其余化学计量指标在3个生活型间无显著(P>0.05)差异。随年均温升高,乔木叶片N∶P显著升高,灌木叶片C∶P和N∶P显著降低,草本叶片N含量和C∶N分别极显著(P<0.01)降低和升高;随年均降水量升高,灌木叶片N∶P显著升高,草本叶片N含量和C∶N分别极显著升高和降低。土壤含水量和土壤有机碳含量是影响乔木叶片化学计量指标变异的主要环境因子,其中,叶片N含量与土壤含水量以及叶片C∶P与土壤有机碳含量在0.05水平呈负相关,叶片P含量与2个环境因子均在0.05水平呈正相关,而叶片N∶P与2个环境因子分别在0.05和0.01水平呈负相关。土壤速效磷含量和土壤pH值是影响灌木叶片化学计量指标变异的主要环境因子,但仅叶片P含量与土壤速效磷含量在0.05水平呈正相关,叶片C∶P与土壤速效磷含量则在0.05水平呈负相关。土壤含水量、土壤硝态氮含量和土壤容重是影响草本叶片化学计量指标变异的主要环境因子,其中,叶片N含量与土壤含水量和土壤容重在0.001水平分别呈正相关和负相关,叶片C∶N与2个环境因子在0.001水平分别呈负相关和正相关,叶片C∶P与2个环境因子在0.05水平分别呈负相关和正相关,而叶片P含量与环境容重在0.05水平呈负相关。综上所述,贺兰山西坡乔木、灌木和草本植物生长均受N限制,灌木植物生长还受P限制。影响不同生活型植物叶片化学计量指标的环境因子不同,因此,在保护与恢复�Dominant species of arbor,shrub,and herb in typical plant community at elevation range of 1848-2707 m on the western slope of Helan Mountain were selected,leaf C,N,and P contents and ratios of different life form plants were compared,and the correlations of these stoichiometric indexes with forteen environmental factors were analyzed.The results show that the overall leaf C,N,and P contents are 431.58,15.66,and 1.79 mg·g^(-1),respectively,and the C∶N,C∶P,and N∶P are 28.62,254.87,and 9.11,respectively.In which,leaf C content of arbor is significantly(P<0.05)higher than that of shrub and herb,leaf C∶N of shrub is significantly lower than that of herb and arbor,and there is no significant(P>0.05)difference in the other stoichiometric indexes among the three life forms.With the increase of mean annual temperature,leaf N∶P of arbor significantly increases,leaf C∶P and N∶P of shrub significantly decrease,and leaf N content and C∶N of herb extremely significantly(P<0.01)decreases and increases,respectively;with the increase of mean annual precipitation,leaf N∶P of shrub significantly increases,and leaf N content and C∶N of herb extremely significantly increases and decreases,respectively.Soil water content and soil organic carbon content are the main environmental factors affecting variations of leaf stoichiometric indexes of arbor,in which,leaf N content with soil water content and leaf C∶P with soil organic carbon content show negative correlations at 0.05 level,and leaf P content shows positive correlations with the two environmental factors at 0.05 level,while leaf N∶P shows negative correlations with the two environmental factors at 0.05 and 0.01 levels,respectively.Soil available phosphorus content and soil pH value are the main environmental factors affecting variations of leaf stoichiometric indexes of shrub,but only leaf P content shows a positive correlation with soil available phosphorus content at 0.05 level,and leaf C∶P shows a negative correlation with soil available phosphorus c

关 键 词：贺兰山西坡 化学计量指标 生活型 环境影响因子 养分限制 植被保护 

分 类 号：Q946.91[生物学—植物学] Q948.11