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Aerial plant biomass and litterfall as local determinants of leaf litter and fine root decomposition in a semiarid ecosystem of the Neotropical region
Arid Land Research and Management ( IF 1.4 ) Pub Date : 2019-03-09 , DOI: 10.1080/15324982.2019.1573387
Uirandé Oliveira 1 , André Megali Amado 2, 3 , Alexandre Vasconcellos 4
Affiliation  

Abstract The rate of litter decomposition can vary within ecosystems that have high spatial heterogeneity, and many uncertainties remain regarding the abiotic and biotic factors that act as determinants of decomposition rates at small spatial scales. This study investigated the decomposition rates of leaves and fine roots of Croton sonderianus Mull. Arg., Poincianella pyramidalis Tul., and Aspidosperma pyrifolium Mart. over 12 months in a semiarid ecosystem in Brazil. Twelve biotic and abiotic factors were also evaluated as local determinants of decomposition rates. A 2000 × 500 m grid was delimited within which thirty 20 × 20 m plots were established. Two sets of litterbags were installed in each plot, one containing a mixture of leaves and the other a mixture of roots. The approximate mean lost mass was 90% for leaf material and 47% for roots after 10 and 12 months, respectively. Due to the litterbag incubation sites being distributed in a heterogeneous area, values for the intrinsic decay coefficient (k) (through month) varied widely from a minimum of 0.073 to a maximum of 0.458 for leaf litter and from 0.045 to 0.077 for roots. Variation in the decay coefficients for leaves and roots was significantly explained by aerial plant biomass and litterfall production, respectively; more open areas exhibited the highest rates of decomposition. Vegetation structure that favors the exposure of soil to solar radiation can influence the decomposition process, promoting an increase in leaf, and fine root decomposition rates at small spatial scales in tropical semiarid ecosystems.

中文翻译:

气生植物生物量和凋落物作为新热带地区半干旱生态系统中落叶和细根分解的局部决定因素

摘要 在具有高度空间异质性的生态系统中,凋落物分解率可能会有所不同,并且在小空间尺度上作为分解率决定因素的非生物和生物因素仍然存在许多不确定性。本研究调查了巴豆叶和细根的分解率。Arg.、Poincianella pyramidalis Tul. 和 Aspidosperma pyrifolium Mart。在巴西的半干旱生态系统中超过 12 个月。十二个生物和非生物因素也被评估为分解率的局部决定因素。划定了一个 2000 × 500 m 的网格,其中建立了 30 个 20 × 20 m 的地块。每个地块都安装了两组垃圾袋,一组包含叶子的混合物,另一组包含根的混合物。在 10 个月和 12 个月后,叶材料的近似平均损失质量分别为 90% 和根的 47%。由于垃圾袋孵化地点分布在异质区域,内在衰减系数 (k)(通过月份)的值变化很大,从叶凋落物的最小值 0.073 到最大值 0.458,根的从 0.045 到 0.077。叶和根腐烂系数的变化分别由地上植物生物量和凋落物产量显着解释;更多的开放区域表现出最高的分解率。有利于土壤暴露于太阳辐射的植被结构可以影响分解过程,促进热带半干旱生态系统小空间尺度上的叶子和细根分解率的增加。由于垃圾袋孵化地点分布在异质区域,内在衰减系数 (k)(通过月份)的值变化很大,从叶凋落物的最小值 0.073 到最大值 0.458,根的从 0.045 到 0.077。叶和根腐烂系数的变化分别由地上植物生物量和凋落物产量显着解释;更多的开放区域表现出最高的分解率。有利于土壤暴露于太阳辐射的植被结构可以影响分解过程,促进热带半干旱生态系统小空间尺度上的叶子和细根分解率的增加。由于垃圾袋孵化地点分布在异质区域,内在衰减系数 (k)(通过月份)的值变化很大,从叶凋落物的最小值 0.073 到最大值 0.458,根的从 0.045 到 0.077。叶和根腐烂系数的变化分别由地上植物生物量和凋落物产量显着解释;更多的开放区域表现出最高的分解率。有利于土壤暴露于太阳辐射的植被结构可以影响分解过程,促进热带半干旱生态系统小空间尺度上的叶子和细根分解率的增加。内在衰减系数 (k)(通过月份)的值变化很大,从凋落物的最小值 0.073 到最大值 0.458,根的从 0.045 到 0.077。叶和根腐烂系数的变化分别由地上植物生物量和凋落物产量显着解释;更多的开放区域表现出最高的分解率。有利于土壤暴露于太阳辐射的植被结构可以影响分解过程,促进热带半干旱生态系统小空间尺度上的叶子和细根分解率的增加。内在衰减系数 (k)(通过月份)的值变化很大,从凋落物的最小值 0.073 到最大值 0.458,根的从 0.045 到 0.077。叶和根腐烂系数的变化分别由地上植物生物量和凋落物产量显着解释;更多的开放区域表现出最高的分解率。有利于土壤暴露于太阳辐射的植被结构可以影响分解过程,促进热带半干旱生态系统小空间尺度上的叶子和细根分解率的增加。更多的开放区域表现出最高的分解率。有利于土壤暴露于太阳辐射的植被结构可以影响分解过程,促进热带半干旱生态系统小空间尺度上的叶子和细根分解率的增加。更多的开放区域表现出最高的分解率。有利于土壤暴露于太阳辐射的植被结构可以影响分解过程,促进热带半干旱生态系统中小空间尺度的叶和细根分解率的增加。
更新日期:2019-03-09
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