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Effects of root diameter, branch order, root depth, season and warming on root longevity in an alpine meadow

机译：高寒草甸根系直径，分支顺序，根系深度，季节和变暖对根系寿命的影响

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摘要

Fine root is of importance in biogeochemical cycles especially in terrestrial ecosystems. The lack of understanding of the factors controlling root lifespan has made accurate prediction of carbon flow and nutrient cycling difficult. A controlled warming experiment was performed in an alpine meadow on the northern Tibetan Plateau (near Nagchu Town). We used a minirhizotron technique to measure root dynamics in situ during the growing season of 2013 and 2014 and survival analyses to assess root lifespan and the effects of root diameter, branch order, birth season, root depth and warming on root lifespan. Root diameter, branch order and root depth were all positively correlated with root lifespan. With an increase in diameter of 0.1 mm, mortality hazard ratio of roots declined by 19.3 %. An increase in one level in branch order was associated with a decrease of 43.8 % in root death ratio. Compared with roots born in May-mid-July, the mortality hazard ratio of roots born in late July-August and September-October reduced by 26.8 and 56.5 %, respectively. In warming treatments, roots tended to be thinner, less branched and deeper, and there was a higher proportion of roots born in spring compared to ambient conditions. Warming shortened the median root lifespan 44 days. However, in single warming condition, root diameter had no significant influence on root lifespan. Root diameter, branch order, root depth and season of birth were all factors affecting root lifespan in the alpine meadow; however, root branch order was dominant.
机译：细根在生物地球化学循环中尤其是在陆地生态系统中至关重要。缺乏对控制根系寿命的因素的了解，使得准确预测碳流量和养分循环变得困难。在青藏高原北部（那曲镇附近）的一个高山草甸上进行了受控的升温实验。我们使用微根管技术在2013年和2014年生长期测量根系动态，并进行生存分析以评估根系寿命以及根系直径，分支顺序，出生季节，根系深度和变暖对根系寿命的影响。根直径，分支顺序和根深均与根寿命成正相关。随着直径增加0.1 mm，根部的死亡风险比降低了19.3％。分支顺序增加一级与根死亡率降低43.8％相关。与5月中旬至7月中旬出生的根相比，7月至8月下旬和9月至10月出生的根的致死率分别降低了26.8％和56.5％。在加温处理中，根部趋于更细，分支更少和更深，并且与环境条件相比，春季生根的比例更高。变暖使根部平均寿命缩短了44天。但是，在单次加热条件下，根的直径对根的寿命没有显着影响。根直径，分支顺序，根深和出生季节都是影响高寒草甸根寿命的因素。但是，根分支顺序占主导地位。

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  • 来源
    《Ecological research》 |2016年第5期|739-747|共9页
  • 作者

    Wang Zhikai; Ding Lubin; Wang Jingsheng; Zuo Xiaolong; Yao Shuaichen; Feng Jiguang;

  • 作者单位

    Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Lhasa Plateau Ecosyst Res Stn, 11A Datun Rd, Beijing 100101, Peoples R China|Renmin Univ China, Sch Environm & Nat Resources, 59 Zhongguancun St, Beijing 100872, Peoples R China;

    Renmin Univ China, Sch Environm & Nat Resources, 59 Zhongguancun St, Beijing 100872, Peoples R China;

    Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Lhasa Plateau Ecosyst Res Stn, 11A Datun Rd, Beijing 100101, Peoples R China|Renmin Univ China, Sch Environm & Nat Resources, 59 Zhongguancun St, Beijing 100872, Peoples R China;

    Renmin Univ China, Sch Environm & Nat Resources, 59 Zhongguancun St, Beijing 100872, Peoples R China;

    Renmin Univ China, Sch Environm & Nat Resources, 59 Zhongguancun St, Beijing 100872, Peoples R China;

    Renmin Univ China, Sch Environm & Nat Resources, 59 Zhongguancun St, Beijing 100872, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Alpine meadow; Global warming; Root lifespan; Root trait; Minirhizotron;

    机译：高寒草甸;全球变暖;根系寿命;根系性状;小型根管;

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