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Fluvial transport of coarse particulate organic matter in a coastal mountain stream of a rainy‐temperate evergreen broadleaf forest in southern Chile
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2020-07-21 , DOI: 10.1002/esp.4961
Andrés Iroumé 1 , Virginia Ruiz‐Villanueva 2 , Sebastián Salas‐Coliboro 1
Affiliation  

Coarse particulate organic matter (CPOM, i.e. particles such as leaves, wood fragments, twigs, branches, flowers, seeds and fruits) in aquatic systems influences the flow, provides an important food source, and at the catchment scale, may significantly contribute to total carbon export. CPOM exports have rarely been quantified in subtropical, broadleaf forest streams. We captured CPOM in Bunte traps in the rainfall‐dominated Vuelta de Zorra stream in southern Chile to (a) propose a novel classification to characterize the different CPOM components, (b) analyze the frequency of each matter class (i.e. leaves, wood fragments, and ‘others’) and its seasonal variability, (c) quantify the CPOM transported, (d) derive a model to quantify CPOM transport rates, and (e) compare the transported CPOM data with those from a unique long‐term (> seven years) large wood monitoring dataset. Results showed that leaves were significantly more abundant than other types of CPOM in all seasons. The dry CPOM transport rate ranged over three orders of magnitude, and there was a significant relationship with mean discharge. Mean dry CPOM yield for the study period 2015–2017 was 4.6 kg/ha/yr when normalizing to the total forested catchment area. The 2009–2018 decadal average yield was 6.8 kg/ha/yr when normalizing to the total forested catchment area. These values are similar to measurements from deciduous and coniferous forests in streams in the United States and the Brazilian Mato Grosso and ~1/10 of the yields obtained in a Swiss torrent. Over a three‐year period, the CPOM exports in Vuelta de Zorra ranged between 13 and 36% of the exported large wood (particles with diameters ≥ 100 mm and length ≥ 1 m) exports. Our data collected from an underrepresented area improve the understanding of global carbon budgets and cycling. © 2020 John Wiley & Sons, Ltd.

中文翻译:

智利南部多雨温带常绿阔叶林的沿海山区河流中粗颗粒有机物的河流运输

水生系统中的粗颗粒有机物(CPOM,即诸如叶子,木头碎片,树枝,树枝,花朵,种子和水果之类的颗粒)影响流量,提供重要的食物来源,并且在集水规模上,可能对总产量有重大贡献碳出口。CPOM出口很少在亚热带阔叶林溪流中量化。我们在智利南部以降雨为主的Vuelta de Zorra河中的Bunte圈闭中捕获了CPOM,以(a)提出一种新颖的分类法来表征CPOM的不同成分,(b)分析每种物质类别(例如,树叶,木材碎片,和“其他”)及其季节性变化,(c)量化运输的CPOM,(d)推导模型以量化CPOM的运输速度,以及(e)将运输的CPOM数据与唯一长期运输的数据进行比较(> 七年)大型木材监测数据集。结果表明,所有季节的叶子都比其他类型的CPOM丰富得多。CPOM的干运输速率超过三个数量级,并且与平均排放量有显着关系。与森林覆盖的总集水面积归一化后,研究期间2015–2017年的平均CPOM干枯产量为4.6千克/公顷/年。当按森林覆盖的总集水面积归一化时,2009-2018年的十年平均产量为6.8千克/公顷/年。这些值类似于从美国和巴西的马托格罗索州的溪流中的落叶和针叶林中测得的值,以及从瑞士洪流中获得的约1/10的产量。在三年的时间里,CPOL在Vuelta de Zorra的出口占出口的大木材(直径≥100 mm和长度≥1 m的颗粒)的13%至36%。我们从代表性不足的地区收集的数据增进了对全球碳预算和循环的理解。分级为4 +©2020 John Wiley&Sons,Ltd.
更新日期:2020-07-21
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