摘要
植物的资源分配模式可以反映植物对环境的生态适应策略。本研究以毛乌素沙地优势半灌木油蒿(Artemisia ordosica)为研究对象,通过样地调查法,系统分析了不同沙漠化程度(潜在、轻度、中度、重度)下油蒿营养、生殖器官的生长特征和生物量分配规律。结果表明:(1)随着沙漠化程度的加剧,单位面积油蒿种群密度及地上生物量降低,枯死率增加。(2)沙漠化程度的加剧会促进油蒿个体的生长,其当年单株地上总生物量由374.4 g(潜在)增加至2999.6 g(重度),增幅高达701.18%;这一过程中油蒿繁殖分配明显增加,营养分配显著降低(P<0.05),潜在、轻度沙漠化阶段油蒿繁殖分配均保持在18.6%左右,增加不显著(P>0.05),但中度、重度沙漠化阶段油蒿繁殖分配达到40.6%和62.4%,远高于潜在沙漠化阶段。(3)油蒿营养枝和生殖枝的直径、长度及生物量均随着沙漠化程度的增加而增加,但轻度沙漠化阶段油蒿营养枝的生物量显著大于(P<0.05)潜在、中度沙漠化阶段,约是两者的2.0倍和0.7倍。(4)面对沙漠化程度的加剧,油蒿营养枝和生殖枝构件的各指标(叶生物量、茎生物量、穗生物量、叶密度和穗密度)整体上均呈增加趋势,但油蒿叶分配所占比重显著降低(P<0.05),茎分配所占比重先增加后降低,轻度沙漠化阶段油蒿营养生长的茎分配占比最大(41.1%),而生殖枝构件中穗(种子)分配所占比重不断增加。因此,沙漠化的发展严重影响油蒿种群的生存和发展,但油蒿个体的生长及生物量分配格局会随着沙漠化程度的加剧发生调整与权衡,油蒿个体生长策略由以营养生长为主向生殖生长为主发生转变。
The resource allocation pattern of plants can reflect the ecological adaptation strategies of plants to the environment.In this study,Artemisia ordosica a dominant semi-shrub in the Mu Us Sandyland was selected as the research object.The growth characteristics and biomass allocation law of A.ordosica in different degrees desertification(potential,slight,moderate,and severe)were systematically analyzed by the sample plot survey method.The results showed that:(1)With the intensification of desertification,the density of A.ordosica population per unit area and above-ground biomass decreased,and the mortality rate increased.(2)The intensification of desertification will promote the growth of A.ordosica individuals.The total above-ground biomass increased from 374.4 g·plant-1(potential)to 2999.6 g·plant-1(severe)that year,increase by 701.18%;this During the process,the reproduction and distribution of A.ordosica increased significantly,and the nutrient distribution was significantly reduced(P<0.05).The reproduction and distribution of Art.The reproduction and distribution of A.ordosica reached 40.6%and 62.4%in the stage,which were much higher than the potential desertification stage.(3)The diameter,length and biomass of the vegetative branches and reproductive branches of A.ordosica increased with the increase of the degree of desertification,but the biomass of the vegetative branches of Art.The desertification stage is about 2.0 and 0.7 times the two.(4)Facing the intensification of desertification,the indicators(leaf biomass,stem biomass,ear biomass,leaf density and ear density)of A.ordosica vegetative branches and reproductive branch components showed an overall increasing trend,but A.ordosica The proportion of leaf distribution decreased significantly(P<0.05),and the proportion of stem distribution increased first and then decreased.The proportion of stem distribution for vegetative growth of A.ordosica in the mild desertification stage was the largest(41.1%),while the reproductive branch component in the ear(se
作者
孙迎涛
岳艳鹏
成龙
庞营军
赵河聚
费兵强
修晓敏
吴波
赵雨兴
石麟
何金军
贾晓红
Sun Yingtao;Yue Yanpeng;Cheng Long;Pang Yingjun;Zhao Heju;Fei Bingqiang;Xiu Xiaomin;Wu Bo;Zhao Yuxing;Shi Lin;He Jinjun;Jia Xiaohong(Institute of Desertification Studies/Key Laboratory of Desert Ecosystem and Global Change/Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091,China;Ordos Forestry and Grassland Research Institute,Ordos 017000,Inner Mongolia,China)
出处
《中国沙漠》
CSCD
北大核心
2022年第1期123-133,共11页
Journal of Desert Research
基金
科技兴蒙行动重点专项(KJXM-EEDS-202006)
国家重点研发计划项目(2016YFC0500801,2016YFC0500806)
科技基础资源调查专项(2017FY100206)
中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2016ZD010)
国家自然科学基金项目(41701010)。
关键词
沙漠化
生物量
繁殖分配
营养分配
资源分配模式
权衡
desertification
biomass
reproductive allocation
vegetative allocation
resource allocation pattern
trade-off
