Slow decomposition of very fine roots and some factors controlling the process: a 4-year experiment in four temperate tree species
Slow decomposition of very fine roots and some factors controlling the process: a 4-year experiment in four temperate tree species
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极细根的缓慢分解和控制该过程的一些因素：对四种温带树种进行的为期 4 年的实验
DOI：
10.1007/s11104-013-1755-4
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发表时间：
2013-05
期刊：
影响因子：
4.9
通讯作者：
Han, Yingying
中科院分区：
文献类型：
--
作者：
Sun, Tao;Mao, Zijun;Han, Yingying
背景和目的尽管我们越来越认识到细根对土壤有机碳库和养分循环的巨大贡献，但它们的分解动力学仍然很难量化。我们进行了为期4年的垃圾袋研究，不同的根大小类（< 0.5和0.5-2.0 mm）。在根系分解的初期和后期，4种植物根系中，<0.5 mm的根比0.5-2.0 mm的根分解得慢。在我们测量的所有根组织化学中，分解率与酸不可水解组分浓度相关性最好。然而，没有相关性被发现的任何养分相关的根质量参数和分解率。与质量损失相反，极细根（< 0.5 mm）比0.5-2.0 mm根的根净N释放量下降更快。此外，大部分的氮被释放在分解的最后阶段，在此期间，culturalcitrant碳化合物被decomposed.ConclusionsWe得出结论，根碎屑中的碳质量，而不是初始养分的浓度控制其分解动力学在一个相对营养丰富的土壤在中国东北地区。这些模式可以解释为较低的易获得的不稳定碳和较高的易获得的碳馏分在非常细的根（< 0.5毫米）比0.5-2.0毫米的根，至少在我们研究的四个物种。
Background and aimsDespite our growing appreciation of the large contribution made by fine roots to soil organic carbon pool and nutrient cycling, their decomposition dynamics still remain poorly quantified.MethodsIn a field experiment, we conducted a 4-year litterbag study on different root size classes (< 0.5 and 0.5–2.0 mm) in four temperate tree species.ResultsVery fine roots (< 0.5 mm) decomposed more slowly than 0.5–2.0 mm roots in the four species roots studied in both the initial and later phases of root decomposition. Of all the root tissue chemistry we measured, decomposition rates correlated best with acid-unhydrolyzable fraction concentrations. However, no correlation was found for any of the nutrient related root quality parameters and decomposition rates. In contrast to mass loss, root net N released declined more rapidly in very fine roots (< 0.5 mm) than in 0.5–2.0 mm roots. Additionally, much of nitrogen was released in the final stages of decomposition, during which the recalcitrant carbon compounds were decomposed.ConclusionsWe conclude that the quality of carbon in root detritus and not the concentration of initial nutrients control its decomposition dynamics in a relatively nutrient-rich soil in northeastern China. These patterns can be explained by lower easily accessible labile carbon and higher recalcitrant carbon fractions in very fine roots (< 0.5 mm) than in 0.5–2.0 mm roots, at least in the four species we studied.
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影响因子：
0.6
作者：
G. Ågren;F. Andersson
通讯作者：
G. Ågren;F. Andersson
影响因子：
4.9
作者：
Yanmei Xiong;Pingping Fan;S. Fu;H. Zeng;Dali Guo
通讯作者：
Yanmei Xiong;Pingping Fan;S. Fu;H. Zeng;Dali Guo
影响因子：
4
作者：
K. Pregitzer;M. Laskowski;A. Burton;Veronica C. Lessard;D. Zak
通讯作者：
K. Pregitzer;M. Laskowski;A. Burton;Veronica C. Lessard;D. Zak
影响因子：
2.7
作者：
De Deyn, Gerlinde Barbra;Biere, A.;Klironomos, J. N.
通讯作者：
Klironomos, J. N.
DOI：
10.1111/j.1469-8137.2011.03694.x
发表时间：
2011-07
期刊：
The New phytologist
影响因子：
--
作者：
R. Koide;Christopher W. Fernandez;Matthew S. Peoples
通讯作者：
R. Koide;Christopher W. Fernandez;Matthew S. Peoples