Effects of Drying and Re-Wetting on Litter Decomposition and Nutrient Recycling: A Manipulative Experiment
Effects of Drying and Re-Wetting on Litter Decomposition and Nutrient Recycling: A Manipulative Experiment
复制标题
干燥和再润湿对凋落物分解和养分回收的影响：一项操作性实验
DOI：
10.3390/w11040708
复制
发表时间：
2019
期刊：
影响因子：
3.4
通讯作者：
P. Viaroli
中科院分区：
文献类型：
--
作者：
Beatrice Palmia;M. Bartoli;A. Laini;R. Bolpagni;C. Ferrari;P. Viaroli
气候变化和取水可能会将河流从常年流转为间歇性流水系统，从而改变其非生物和生物底栖环境，并影响养分周转等生态系统过程。我们进行了一项微观实验，以研究水间歇性、大型动物和叶子大小（黑杨叶子）对养分矿化和循环的相互作用影响。将叶盘（直径 1 或 5 厘米）在有或没有食用叶子的 Potamophylax cingulatus 幼虫（毛翅目，Limnephilidae）的情况下孵育 40 天，并在有或没有干预的情况下进行为期 10 天的流干燥和随后的再润湿模拟。测量养分通量、残留叶片生物量和叶片元素组成，以评估间歇性、大型动物和叶片大小如何影响有机质矿化速率和化学计量。结果表明，干燥会减慢分解速度，影响微生物并使大型动物活动为零。大型动物的存在提高了矿化和养分（C、N 和 P）再生率。我们的研究结果还表明，直径较大的叶盘表现出较高的微生物活性和 NH4+ 再生能力。在实验过程中，随着叶子材料富含氮和磷，残余凋落物的碳：氮：磷比率发生了变化。我们的研究表明，日益频繁的干旱事件可能会减缓矿化速率和下游养分运输。
Climate change and water abstraction may change stream flow from perennial into intermittent lotic systems, modifying their abiotic and biotic benthic environment and impacting ecosystem processes such as nutrient turnover. We conducted a microcosm experiment to investigate the interactive effect of water intermittency, macrofauna and leaf size (Populus nigra leaves) on nutrient mineralization and recycling. Leaf disks (1 or 5 cm diameter) were incubated for 40 days with or without the leaf-consumer, Potamophylax cingulatus larvae (Trichoptera, Limnephilidae) and with or without an intervening, 10-days simulation of stream drying and subsequent rewetting. Nutrient fluxes, residual leaf biomass and leaf elemental composition were measured to evaluate how intermittency, macrofauna and leaf size affect organic matter mineralization rates and stoichiometry. Results suggest that drying slows decomposition rates, impacting both the microbial and setting to zero macrofauna activities. The presence of macrofauna increases mineralization and nutrient (C, N and P) regeneration rates. Our findings also suggest that leaf disks with higher diameter display higher microbial activity and NH4+ regeneration. During the experiment, the C:N:P ratios of residual litter changed, as the leaf material became enriched with N and P. Our study suggests that increasingly frequent dry events might slow mineralization rates and downstream nutrient transport.
温带低地溪流超季节水文干旱期间和之后的叶子腐烂过程
影响因子：
1.9
作者：
Schlief
通讯作者：
Schlief