Diameter-related variations in root decomposition of three common subalpine tree species in southwestern China
Diameter-related variations in root decomposition of three common subalpine tree species in southwestern China
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中国西南地区三种常见亚高山树种根分解的直径相关变化
DOI：
10.1016/j.geoderma.2017.09.041
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发表时间：
2018-02
期刊：
影响因子：
6.1
通讯作者：
Zhenfeng Xu
中科院分区：
文献类型：
--
作者：
LiyanZhuang;Wanqin Yang;Fuzhong Wu;Bo Tan;Li Zhang;Kaijun Yang;Ruoyang He;Zhijie Li;Zhenfeng Xu
尽管根质量的重要性，其分解，森林转换和直径大小对根分解的影响仍然知之甚少。采用凋落物袋法对青藏高原东部3个亚高山树种（岷江冷杉、云杉和红桦）0-2 mm、2-5 mm和5-10 mm 3个根径级的质量损失和养分释放进行了为期2年的研究。B. albosinensis的腐烂速度比两种针叶树（A. faxoniana和P. asperata）在2-5 mm和5-10 mm的根中。两种针叶树的根径与腐朽率呈显著负相关。无论树种和直径级，所有根凋落物经历了显着的净氮（N）和磷（P）固定在第一个冬天。培养2年后，2-5 mm和5-10 mm的根比细根释放更多的N。在整个试验期间，几乎没有观察到明显的P释放的所有根凋落物。不同树种的C：N和C：P比值在试验期间均表现为0-2 mm根< 2-5 mm根< 5-10 mm根的趋势。根系分解和氮释放与初始根系质量（例如，N和C：N）。我们的研究结果表明，直径相关的基质质量的变化可能是根分解和养分动态的重要驱动力。此外，直径效应取决于树种和分解时间。
Despite the importance of root quality for its decomposition, the effects of forest conversion and diameter size on root decomposition still remains poorly understood. A two-year field experiment was conducted to examine the mass loss and nutrient release of three root diameter classes (0–2 mm, 2–5 mm and 5–10 mm) in three subalpine tree species (Abies faxoniana,Picea asperataandBetula albosinensis) using a litter-bag method on the eastern Tibetan Plateau of China. The roots ofB. albosinensisdecayed faster compared to those of two conifer trees (A. faxonianaandP. asperata) in the 2–5 mm and 5–10 mm roots. Root diameter and decay rate exhibited a significantly negative correlation for two conifer trees. Regardless of tree species and diameter classes, all root litters experienced significant net nitrogen (N) and phosphorus (P) immobilization during the first winter. Both 2–5 mm and 5–10 mm roots tended to release more N than fine roots after 2-year incubation. Almost no obvious P release was observed for all root litters over the experimental period. Irrespective of tree species, both C:N and C:P ratios followed a trend of 0–2 mm roots < 2–5 mm roots < 5–10 mm roots during the experimental period. The root decomposition and N release were strongly associated with initial root quality (e.g., N and C:N). Our results suggest that diameter-associated variations in substrate quality could be an important driver of root decomposition and nutrient dynamics. Moreover, the diameter effects are dependent on tree species and decomposition period.
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影响因子：
4.2
作者：
P. Zhang;Xingjun Tian;Xing-bing He;Fu-qiang Song;L. Ren;Ping Jiang
通讯作者：
P. Zhang;Xingjun Tian;Xing-bing He;Fu-qiang Song;L. Ren;Ping Jiang
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
影响因子：
4.9
作者：
Sun, Tao;Mao, Zijun;Han, Yingying
通讯作者：
Han, Yingying
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：
1.7
作者：
X. Ni;Wanqin Yang;Han Li;Liya Xu;Jie He;B. Tan;Fuzhong Wu
通讯作者：
X. Ni;Wanqin Yang;Han Li;Liya Xu;Jie He;B. Tan;Fuzhong Wu
影响因子：
4.9
作者：
N. Makita;Ayumi Kawamura;A. Osawa
通讯作者：
N. Makita;Ayumi Kawamura;A. Osawa