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Decomposition dynamic of fine roots in a mixed forest of Cunninghamia lanceolata and Tsoongiodendron odorum in mid-subtropics

机译:中亚热带杉木和杉木香椿混交林中细根的分解动态

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Decomposition of fine roots (< 2 mm in diameter, viz. < 0.5 mm, 0.5-1.0 mm, 1.0-2.0 mm) was studied by means of litter bag in a mixed forest of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) and Tsoong's tree (Tsoongiodendron odorum Chun) in Sanming, Fujian, China. In a 540 d period of decay, fine roots in all litter bags decomposed in a three-phase manner: (a) for the Chinese fir, an initial, relatively low rate of decay up to 90 d followed by a period of rapid weight loss until 270 d, and then by a phase of slow decay rate; (b) for the Tsoong's tree, a rapid loss period between 0-60 d followed by a relatively rapid loss period between 60-360 d, and then a slow loss period between 360540 d occurred. The mass loss after 1 yr of decomposition ranged from 58.5% to 63.3% for the Chinese fir and 68.8% to 78.2% for the Tsoong's tree. Fine roots with a larger diameter had a lower rate of mass loss. Consistent increase in lignin concentration and decrease in absolute amount of phosphorus (P) were found for fine roots of the two tree species during decomposition. The absolute amounts of nitrogen (N) increased a little initially in the fine roots of the Chinese fir during a short duration. In contrast, the fine roots of Tsoong's tree were releasing N from the outset. The chemical composition controlled decomposition rate and it was found a change of TNC (total nonstructural carbohydrates)-regulating in the initial decomposition phase to lignin- or N-regulating in the second phase, and P- or lignin-regulating in the last phase.
机译:细根的分解(直径<2 mm,即<0.5 mm,0.5-1.0 mm,1.0-2.0 mm)是在杉木(Cunninghamia lanceolata(Lamb。)Hook)混合林中用垃圾袋研究的。 )和福建三明的Tsoong的树(Tsoongiodendron odorum Chun)。在540天的腐烂期中,所有垃圾袋中的细根都以三相方式分解:(a)对于杉木,最初的相对较低的腐烂率直至90天,随后是一个快速的体重减轻期直到270 d,然后以一个缓慢的衰减速率阶段; (b)对于Tsoong树,发生0-60 d的快速损失期,随后发生60-360 d的相对快速损失期,然后出现360540 d的缓慢损失期。杉木分解1年后的质量损失范围为58.5%至63.3%,而松树为68.8%至78.2%。直径较大的细根质量损失率较低。在分解过程中,发现这两种树的细根的木质素浓度一致增加,而磷(P)的绝对量减少。在杉木的细根中,短期内氮的绝对含量最初有所增加。相反,崇树的细根从一开始就释放了N。化学成分控制了分解速率,发现在初始分解阶段,TNC(总非结构性碳水化合物)调节变为第二阶段为木质素或N调节,而在最后阶段则为P-或木质素调节。

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