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微根管法和同位素法在细根寿命研究中的应用及比较

Minirhizotron and radiocarbon methods: Their application and comparison in estimating fine root longevity

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【作者】 全先奎于水强史建伟于立忠王政权

【Author】 QUAN Xian-kui1, YU Shui-qiang1, SHI Jian-wei1, YU Li-zhong, WANG Zheng-quan1 (1College of Forestry, Northeast Forestry University, Harbin 150040, China; 2Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China)

【机构】 东北林业大学林学院中国科学院沈阳应用生态研究所东北林业大学林学院 哈尔滨150040哈尔滨150040沈阳110016

【摘要】 细根的生产和周转在陆地生态系统的碳和养分循环中起着重要作用,并且对全球环境变化具有一定的指示意义。细根寿命是估计细根周转的关键,其长短决定了养分和碳消耗与循环的速度。由于采用的研究方法不同,导致所得细根寿命估计值存在较大差异,目前最新的同位素和微根管2种方法之间寿命估计值差异可达10倍以上。本文对这2种研究方法的原理和优点进行了阐述,并从细根定义、细根寿命理论分布假设、细根取样误差等方面对导致这2种方法研究结果存在差异的原因进行分析,以期有助于今后根系研究的发展。

【Abstract】 The production and turnover of fine root plays an important role in terrestrial C- and nutrients cycling of terrestrial ecosystem, and is of significance in indicating global environmental changes. Fine root longevity is a key parameter in estimating fine root turnover, which determines the velocities of C- and nutrients consuming and cycling. However, the estimated longevity of fine root had a larger difference, owing to the discrepancy among the methods adopted. As for the newest estimation methods minirhizotron and radiocarbon (e.g., bomb 14C, and FACE 13C), there was a 10 times more difference of estimated value between them. This paper introduced the principles and advantages of these two methods, and analyzed the reasons inducing such a difference of estimation results from the aspects of fine root heterogeneity, mortality pattern, and sampling errors, which would benefit the future study in this field.

【基金】 国家重点自然科学基金资助项目(30130160)。
  • 【文献出处】 生态学杂志 ,Chinese Journal of Ecology , 编辑部邮箱 ,2007年03期
  • 【分类号】Q94-33
  • 【被引频次】53
  • 【下载频次】947
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