Leaf nutrient concentration, nutrient resorption and litter decomposition in an evergreen broad-leaved forest in eastern China
Leaf nutrient concentration, nutrient resorption and litter decomposition in an evergreen broad-leaved forest in eastern China
复制标题
DOI：
10.1016/j.foreco.2006.11.019
复制
发表时间：
2007-02-15
影响因子：
3.7
通讯作者：
Yan, Enrong
中科院分区：
文献类型：
--
作者：
Huang, Jianjun;Wang, Xihua;Yan, Enrong
虽然植物矿物质营养在温带生态系统中已得到很好的解决，但我们对亚热带常绿阔叶林这一主题的了解仍然很薄弱。我们在中国东部的次生常绿阔叶林中研究了三类植物的不同植物叶子性状和凋落物分解率：落叶树种（DB）和叶子寿命<1.5年（EBS）和>1.5年（EBL）的常绿阔叶树种。相对于 DB，EBS 和 EBL 类的叶片 N 含量分别减少了 33% 和 44%，叶片 P 含量分别减少了 28% 和 45%。 DB、EBS 和 EBL 中的 N 吸收效率分别为 27% 至 65%、21% 至 52% 和 22% 至 51%。 DB 中的预吸收效率为 38% 至 77%，EBS 中为 6% 至 58%，EBL 中为 15% 至 55%。 DB 中的 P 再吸收效率高于 EBS 和 EBL，而 N 吸收效率在三类中没有差异。氮吸收效率与叶片氮或 NT 比率均不相关。相反，磷吸收效率与叶片磷呈正相关。DB、EBS和EBL的凋落物分解率分别为2.45、1.33和2.30年(-1)，但各组之间的分解率没有显着差异。凋落物分解率与比叶面积 (SLA) 和初始凋落物 N 呈正相关，但与凋落物 P 无关。 总之，对于测量的任何叶子性状，EBS 和 EBL 之间没有显着差异，但这两个类别与 DB 不同。与提高氮再吸收效率相比，叶片寿命长的植物更倾向于通过降低凋落物中的氮浓度来最大限度地减少养分损失。 (c) 2006 Elsevier B.V. 保留所有权利。
While plant mineral nutrition has been well addressed in temperate ecosystems, our knowledge of this topic in subtropical evergreen broad-leaved forests remains weak. We examined various plant leaf traits and litter decomposition rates among three groups--deciduous species (DB) and evergreen broad-leaved species with leaf life span < 1.5 years (EBS) and > 1.5 years (EBL) in a secondary evergreen broad-leaved forest in eastern China. Relative to DB, EBS and EBL classes contained 33 and 44% less leaf N, and 28 and 45% less leaf P, respectively. N resorption efficiency varied from 27 to 65%,21 to 52% and 22 to 51 % in DB, EBS and EBL, respectively. P resorption efficiency varied from 38 to 77% in DB, 6 to 58% in EBS and 15 to 55% in EBL. P resorption efficiency was greater in DB than in EBS and EBL while N resorption efficiency did not differ among the three classes. N resorption efficiency was not correlated with either leaf N or NT ratio. In contrast, P resorption efficiency was positively correlated with leaf P. Litter decomposition rates were 2.45, 1.33 and 2.30 year(-1) for DB, EBS and EBL, respectively, but the rates did not significantly differ between groups. Litter decomposition rate was positively correlated with specific leaf area (SLA) and initial litter N but not litter P. In conclusion, there were no significant differences between EBS and EBL for any of the leaf traits measured, but these two classes were different from DB. Plants with long leaf life span tend to minimize nutrient loss more by reducing N concentration in leaf litter than by increasing N resorption efficiency. (c) 2006 Elsevier B.V. All rights reserved.