生态学报2024，Vol.44Issue(12)：5367-5376,10.DOI:10.20103/j.stxb.202306091226
桂西北喀斯特地区退化群落灌草不同器官N、P生态化学计量内稳性特征
Nitrogen and phosphorus stoichiometric homoeostasis in different organs of shrubs and herbs in degraded vegetation communities in the karst area of northwestern Guangxi
摘要
Abstract
Characteristics of plant ecological stoichiometry homeostasis are the result of long-term adaptation to the environment and are related to their ecological adaptation strategies.Nitrogen(N)and phosphorus(P)stoichiometric homoeostasis in different organs of shrubs and grasses in the degraded vegetation communities were studied to provide scientific basis for adaptation strategies of plants in the process of vegetation community degradation in the karst area of northwestern Guangxi.Based on the investigation and sampling of five degraded vegetation communities in the karst area of northwestern Guangxi,the N and P contents of shrubs(leaves,stems,and roots)and herbs(aboveground and underground parts)in different degraded communities were determined.The stoichiometric characteristics,interrelationships between different organs,correlations with soil physicochemical properties,and homoeostasis characteristics were analyzed.The P contents in different organs of shrubs showed a trend:leaf＞stem＞root,while the N content and N:P showed a trend:leaf＞root＞stem.The P,N content and N:P of herbs all showed a trend:aboveground＞underground parts.With the intensified degradation of the vegetation community,the N and P contents of various organs of shrubs and underground parts of herbs,the N:P content of shrub roots showed a decreasing trend;the N and P contents in aboveground parts of herbs showed a decreasing trend in the first four degradation stages,and increased in the fifth stage;the N:P content of underground parts of herbs showed a trend of increase firstly and then significantly increased.While there was no significant change in N∶P in other organs.N∶P of plant leaves was less than 14 in shrubs and herbs.N and P showed significantly positive correlation in all organs;There were positive correlation between the same nutrient element and element ratio among different organs,as well as between shrubs and herbs.N,P and N:P in different organs of shrubs and herbs were significantly positively correlated with soil N,P and N:P.P content in various organs of shrubs and herbs were significantly negatively correlated with soil C:P.The HN、Hp and HN∶P of various organs in shrubs showed a trend:leaf＞stem＞root.The HN of aboveground parts of herbs was greater than that of the underground part,while the Hp and HN∶P were opposite.The homoeostasis of different elements in the same organ of shrubs and herbs showed HN＞Hp＞HN∶P.The growth of shrubs and herbs in karst area was mainly limited by N,and N element had the highest homeostasis.The responses of different organs of shrubs and herbs to changes in N and P content during vegetation community degradation were homogeneity and cooperativity.关键词
内稳性/生态化学计量学/植物器官/喀斯特/退化群落Key words
homoeostasis/ecological stoichiometry/plant organs/karst/degraded community引用本文复制引用
俞月凤,韦建华,胡钧铭,张俊辉,李婷婷,郑富海,张野,苏利荣,何铁光..桂西北喀斯特地区退化群落灌草不同器官N、P生态化学计量内稳性特征[J].生态学报,2024,44(12):5367-5376,10.基金项目
广西自然科学基金面上项目(2023GXNSFBA026336) （2023GXNSFBA026336）
国家自然科学基金项目(32160284,31460135) （32160284,31460135）
科技先锋队"强农富民""六个一"专项行动(桂农科盟 202413) （桂农科盟 202413）
