五大连池新期火山熔岩台地4种乔木植物化学计量及其内稳性特征  

Stoichiometry and homeostasis characteristics of four arbor species at the new stage Volcanic Lava Platform of the Wudalianchi area

作　　者：沙刚[1] 黄庆阳[1] 徐明怡[1,2] 谢立红 杨帆[1] 曹宏杰[1,2] SHA Gang;HUANG Qingyang;XU Mingyi;XIE Lihong;YANG Fan;CAO Hongjie(Institute of Natural Resources and Ecology,Science Academy of Heilongjiang Province,Harbin 150040,Heilongjiang,China;National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation,Harbin 150040,Heilongjiang,China)

机构地区：[1]黑龙江省科学院自然与生态研究所,黑龙江哈尔滨150040 [2]湿地与生态保育国家地方联合工程实验室,黑龙江哈尔滨150040

出　　处：《中南林业科技大学学报》2022年第9期127-138,共12页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(31770497);中央引导地方科技发展专项(ZY20B15);黑龙江省重点研发计划项目(GA21C030);黑龙江省科学院基金项目(KY2021ZR03)。

摘　　要：【目的】内稳性特征反映生物对环境变化的生理和生化适应,与物种的生态适应性策略有关。研究养分贫瘠环境植物不同器官的化学计量及其内稳性特征,为原生演替过程中植物的适应策略研究提供依据。【方法】以五大连池新期火山熔岩台地针叶和阔叶2种生活型的4种乔木(落叶松Larix gmelinii、香杨Populus koreana、山杨Populus davidiana和白桦Betula platyphylla)为研究对象,运用化学计量学方法和指数回归方法探究植物器官化学计量特征、凋落叶再吸收率和内稳性指数(H)的变化特征。【结果】4种植物的叶片磷含量均高于茎和根;落叶松根、茎和叶的C∶P和N∶P显著高于其他3种植物(P<0.05),而C∶N低于其他3种植物;不同植物器官N和P含量与土壤N和P含量存在一定相关性;植物生活型影响化学计量特征,不同植物器官N、P分配存在不均衡性。不同生活型植物养分再吸收率存在差异,凋落物N含量和再吸收率表现为落叶松>白桦>山杨>香杨,差异显著(P<0.05);凋落物P含量和再吸收率表现为山杨>白桦>香杨>落叶松,差异显著(P<0.05)。4种植物N、P和N∶P的内稳性指数(H_(N)、H_(P)和H_(N:P))平均值分别为13.82、13.70和15.59,落叶松不同器官的H_(N)为弱稳态型及弱敏感型,其他3种植物不同器官的内稳性均为稳态型,粗枝与叶的H_(N)、H_(P)和H_(N:P)存在显著差异(P<0.05)。【结论】不同生活型植物不同器官碳、氮、磷含量及其化学计量比存在差异;植物以提高养分的再吸收率来适应养分贫瘠环境以维持自身生长。内稳性指数较低的落叶松将逐渐替代内稳性较强的香杨和山杨而成为优势物种。【Objective】Stoichiometric homeostatic regulation reflects the physiological and biochemical adaption of organisms to environmental changes,which is closely related to the ecological adaptability strategy of species.This study aimed to investigate the stoichiometry and homeostasis regulation characteristics of different plant organs grown in poor soil and explore the coupling relationship between plant adaptation mechanism and habitat characteristics,which can help understand the adaptation strategy of plants during primary succession.【Method】Four tree species comprising three broadleaves(Populus koreana,Populus davidiana,and Betula platyphylla)and one conifer(Larix gmelinii)were selected from the new-period volcanic lava terrace at Wudalianchi for study.The study used a combination of stoichiometry measurements and mathematics models to evaluate the changes of plant stoichiometry,litter resorption efficiency and stoichiometric homeostatic regulation coefficients(H)among different plant organs.【Result】The results indicated that,in all the four plant species,the P content was significantly higher in leaves than in branches and roots;L.gmelinii had significantly higher C:P and N:P ratios in roots,branches and leaves than those in P.koreana,P.davidiana,and B.platyphylla,while the C:N ratio in L.gmelinii was significantly lower than those in the other plant species.The correlation analysis showed that the N and P contents of plant organs showed correlations with those of soil.Our results demonstrated that plant life forms had an effect on nutrient stoichiometry,and the distribution of N and P in different plant organs was unbalanced.Moreover,there were significant differences in the nutrient resorption efficiency among different plant life forms.The litter N concentration and resorption efficiency differed significantly with plant species(P<0.05),which order was L.gmelinii>B.platyphylla>P.davidiana>P.koreana.The litter P concentration and resorption efficiency were in the order as P.davidiana>B.platyphylla

关 键 词：化学计量 养分再吸收 内稳性特征 火山熔岩台地 

分 类 号：S718.43[农业科学—林学]