Litter decomposition is driven by microbes and is more influenced by litter quality than environmental conditions in oil palm streams with different riparian types

Chellaiah, Darshanaa

doi:10.1007/s00027-018-0595-y

Cited by 13 publications

(9 citation statements)

References 109 publications

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“…The litter decay rate proved to be a good and easily measurable indicator of the impact of urbanisation on stream ecological integrity similar to what was found in other studies (Camargo & Alonso, 2006;Chellaiah & Yule, 2018;Rossi et al, 2019;Yule et al, 2015). Although there was a neat negative effect of urbanisation on leaf litter decay, we found that decay rates were strongly related to water-nutrient content depending on the chemical identity (i.e., DIN or SRP).…”

Section: Discussionsupporting

confidence: 88%

Urbanisation reduces litter breakdown rates and affects benthic invertebrate structure in Pampean streams

Tagliaferro

Giorgi

Torremorell

et al. 2019

Internat Rev Hydrobiol

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The Pampean region has become one of the most urbanised areas in South America with more than 91% of the Argentinean population. This region is ideal for human settlements that have historically chosen riverine grassland areas to settle. Consequently, urban streams are increasingly subjected to pressures affecting their functioning. The aim of this study was to assess urbanisation effects on two proxies of stream integrity: leaf litter decay and benthic invertebrate assemblage colonizing litter in streams draining urbanised versus reference grassland areas. We placed plastic coarse‐ and fine‐mesh bags containing Populus nigra leaf litter along three urban and three reference reaches, and these were retrieved periodically to determine the remaining leaf mass and the identity and quantity of detritivore assemblage colonizing bags. The decay rate was negatively affected by urbanisation, and it followed a negative relationship with increasing Nitrogen concentration (mostly ammonia) and a hump‐shape relationship against soluble reactive phosphorus. Urban invertebrate assemblages were significantly different from the reference reaches, and were species‐poorer and characterized by tolerant taxa belonging to Naididae, Glossiphoniidae, and Nematoda, whereas Hyalellidae, Aeglidae, Chironomidae, Caenidae, Baetidae, and Hydrobiidae represented the reference reaches. Our proxies of structural (i.e., invertebrate assemblages) and functional (i.e., leaf litter breakdown) stream integrity were mostly driven by a nutrient‐enrichment gradient and responded in a similar direction but with different magnitude to urban alterations.

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Section: Discussionsupporting

confidence: 88%

Urbanisation reduces litter breakdown rates and affects benthic invertebrate structure in Pampean streams

Tagliaferro

Giorgi

Torremorell

et al. 2019

Internat Rev Hydrobiol

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“…Litter was derived from fresh whole-leaves of Macaranga sp. trees following previous studies (Plowman & Ewers, 2012;Chellaiah & Yule, 2018); these pioneer trees are frequent but not dominant at all our study sites, making it unlikely that there will be a home-field advantage, and their leaves decompose quickly (within a month: Chellaiah & Yule, 2018). Although naturally-abscised, senescent leaves might more accurately reflect the chemistry of natural substrates, we used dried fresh leaves for our experiment, consistent with previous decomposition experiments (Moore & Fairweather, 2006;McLaren & Turkington, 2010) and because it was not feasible to collect sufficient freshly-abscised leaves.…”

Section: Leaf Litter Decomposition and Litter Invertebrate Extractionmentioning

confidence: 85%

Altered litter and cellulose decomposition across an anthropogenic habitat modification gradient in Sulawesi, Indonesia

Holle

Lewis

2022

Preprint

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Many tropical regions in Southeast Asia have experienced extensive habitat modification, creating a mosaic of forested and agricultural land. The capacity of these human-modified tropical landscapes to support biodiversity and ecosystem functions and services is of considerable practical interest. Decomposition of plant material is a key process maintaining the nutrient cycle in both natural and agro-ecosystems, but few studies have documented the relative contributions of different guilds of decomposers, acting on different plant substrates, across different tropical land-uses. We measured decomposition of leaf litter and cellulose across a gradient of anthropogenic habitat modification (forest, shrubland, and corn farmland) within Panua Nature Reserve, Sulawesi, Indonesia. The influence of fungi and the litter invertebrate community were investigated experimentally. Decomposition of both substrates was significantly lower in corn plantations than in forest sites. Partial exclusion of litter invertebrates, but not fungi, significantly reduced decomposition, but the feeding guild composition of the litter invertebrate community did not differ significantly across habitat types. Our results confirm that even small-scale agricultural areas adjacent to forest fragments can experience impaired ecosystem functions. These changes can be linked to reduced invertebrate activity, apparently independent of the functional structure of the litter invertebrate community. Effective management of human-modified landscapes will be needed to maintain nutrient cycling, even in areas where agroecosystems and tropical forests occur in close proximity. Keywords: Tropical forest, Sulawesi, decomposition, substrate, fungus exclusion, and litter invertebrate community.

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“…Generally, Roystonea regia primarily grew in sandy soil with rich carbonate, and thus little difference in total C and N but dramatic distinction in SOC andSON was found (Figure 2). Moreover, the above result was explained by the fact that the leaves of palm plants were usually low quality and consequently very difficult to decompose owing to high structural compounds in the leaf (Chellaiah & Yule, 2018). In addition, no obvious change was found in RIC (60.71%) between forest and CK (64.76%; Figure 4) in LHP, further indicating that palm plants such as Roystonea regia do not have a remarkable C sequestration capacity and potential.…”

Section: Comparisons For Soc Andson In Is and Vegetated Soilsmentioning

confidence: 94%

Comparison of soil organic carbon and nitrogen dynamics between urban impervious surfaces and vegetation

2021

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Impervious surfaces (IS) are widespread globally due to increasing urbanization, and relatively static carbon (C) and nitrogen (N) processes are usually expected in these soils. However, an understanding of how soil organic carbon (SOC) and soil organic nitrogen (SON) dynamics under IS in comparison with urban vegetation is still lacking.Here we used soil fractionation and stable isotopic analysis to examine C and N dynamics in IS soils and soils that were vegetated for 20-30 years in Guangzhou and Shenzhen, China. Soil samples from bare land (CK) and other land uses (grass, forest, and IS) were split into different chemical fractions. The C and N content, C:N ratio, δ 13 C, δ 15 N, C and N recalcitrant indices (RIC, RIN), and mean residence time (MRT) were analyzed. The results showed that soil C and N stocks increased in the first (20 years) as reflected in the enhanced labile (LP) and recalcitrant C pools (RP), but then stabilized or decreased after 30 years with the IS ages in both cities. IS had a lower SOC decomposition rate and thus resulted in 5-10-times longer MRT (259-465 years) than that in vegetated soils (39-55 years). The study showed that IS caused remarkable changes in soil C and N pools and turnover rates compared with vegetated lands. Our results are potentially useful for better understanding, predicting, and managing soil C dynamics under urbanization. K E Y W O R D S grass, impervious surfaces, SOC turnover, urban forest, δ 13 C and δ 15 N 1 | INTRODUCTION Urban expansion has changed the natural landscape by transforming the natural and/or semi-natural lands into impervious surface (IS), which are characterized by high spatiotemporal heterogeneity in both

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Litter decomposition is driven by microbes and is more influenced by litter quality than environmental conditions in oil palm streams with different riparian types

Cited by 13 publications

References 109 publications

Urbanisation reduces litter breakdown rates and affects benthic invertebrate structure in Pampean streams

Urbanisation reduces litter breakdown rates and affects benthic invertebrate structure in Pampean streams

Altered litter and cellulose decomposition across an anthropogenic habitat modification gradient in Sulawesi, Indonesia

Comparison of soil organic carbon and nitrogen dynamics between urban impervious surfaces and vegetation

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