scholarly journals Terrestrial Ecosystem Science 2017 ECRP Annual Report: Tropical Forest Response to a Drier Future: Turnover Times of Soil Organic Matter, Roots, Respired CO2, and CH4 Across Moisture Gradients in Time and Space

2017 ◽  
Author(s):  
Karis J. McFarlane
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Forest ◽  
Annual Report ◽  
Terrestrial Ecosystem ◽  
Time And Space ◽  
Ecosystem Science

Fungal communities in wet tropical forests: variation in time and space

1995 ◽  
Vol 73 (S1) ◽  
pp. 1391-1398 ◽  
Author(s):  
D. Jean Lodge ◽  
Sharon Cantrell
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Forest ◽  
Tropical Forests ◽  
Forest Floor ◽  
Forest Litter ◽  
Fungal Communities ◽  
Plant Nutrient ◽  
Fungal Populations ◽  
Fresh Litter

Understanding variation in tropical forest fungal populations and communities is important for assessing fungal biodiversity, as well as for understanding the regulatory roles fungi play in tropical forests. In wet tropical forests, the canopy is typically occupied by certain wood decomposers, endophytes, epiphylls, and pathogens. Aphyllophoraceous canopy fungi are a subset of species found in the understory. Marasmioid agarics in the understory often form extensive networks of rhizomorphs that trap litter; these and other aerial species are rare on the forest floor. Decomposers are stratified within the forest floor, with some species colonizing only fresh litter, others preferring decomposed litter, and others restricted to soil organic matter. Specificity to particular host substrates is frequent among tropical forest litter decomposers and contributes to spatial heterogeneity in fungal communities over the landscape. Litter basidiomycete and microfungal communities in patches of 1 m2 or less do not significantly resemble communities in similar patches located at distances greater than 100 m. Disturbances induce changes in the environment and the abundance of different substrates, resulting in changes in fungal communities through time, and variation over the landscape. Severe disturbances, as well as the slight daily variations in rainfall, profoundly affect populations of fungal decomposers and their influence on plant nutrient availability. Key words: fungi, tropical forests, diversity, stratification, spatial variation, temporal variation.

scholarly journals The Impact of Redox Fluctuations on Soil Organic Matter Decomposition in Tropical Forest Soils

2020 ◽  
Author(s):  
Amrita Bhattacharyya ◽  
Ashley Campbell ◽  
Rachel Hestrin ◽  
Yang Lin ◽  
Malak Tfaily ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Forest ◽  
Forest Soils ◽  
Organic Matter Decomposition ◽  
Soil Organic Matter Decomposition ◽  
The Impact

scholarly journals Altered litter inputs modify carbon and nitrogen storage in soil organic matter in a lowland tropical forest

2020 ◽  
Author(s):  
Emma J. Sayer ◽  
Catherine Baxendale ◽  
Ali J. Birkett ◽  
Laëtitia M. Bréchet ◽  
Biancolini Castro ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Forest ◽  
Tropical Forests ◽  
C:N Ratio ◽  
N Availability ◽  
Litter Addition ◽  
Lowland Tropical Forest ◽  
Litter Removal ◽  
Som Storage

AbstractSoil organic matter (SOM) in tropical forests is an important store of carbon (C) and nutrients. Although SOM storage could be affected by global changes via altered plant productivity, we know relatively little about SOM stabilisation and turnover in tropical forests compared to temperate systems. Here, we investigated changes in soil C and N within particle size fractions representing particulate organic matter (POM) and mineral-associated organic matter (MAOM) after 13 years of experimental litter removal (L−) and litter addition (L+) treatments in a  lowland tropical forest. We hypothesized that reduced nitrogen (N) availability in L− plots would result in N-mining of MAOM, whereas long-term litter addition would increase POM, without altering the C:N ratio of SOM fractions. Overall, SOM-N declined more than SOM-C with litter removal, providing evidence of N-mining in the L− plots, which increased the soil C:N ratio. However, contrary to expectations, the C:N ratio increased most in the largest POM fraction, whereas the C:N ratio of MAOM remained unchanged. We did not observe the expected increases in POM with litter addition, which we attribute to rapid turnover of unprotected SOM. Measurements of ion exchange rates to assess changes in N availability and soil chemistry revealed that litter removal increased the mobility of ammonium-N and aluminium, whereas litter addition increased the mobility of nitrate-N and iron, which could indicate SOM priming in both treatments. Our study suggests that altered litter inputs affect multiple processes contributing to SOM storage and we propose potential mechanisms to inform future work.

scholarly journals Ecological Value Of Soil Organic Matter (SOM) at Tropical Evergreen Aglaia-Streblus Forest of Meru Betiri National Park, East Java, Indonesia

2017 ◽  
Vol 21 (3) ◽  
pp. 129-140
Author(s):  
Hari Sulistiyowati ◽  
Sugeng Winarso ◽  
Damasa Macandog ◽  
Rachel Sotto ◽  
Nestor Baguinon ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Forest ◽  
Forest Soil ◽  
National Park ◽  
Dry Weight ◽  
Biogeochemical Cycles ◽  
Element Content ◽  
Ecological Value ◽  
Organic C

As part of carbon pools, forest soil stores soil organic matter (SOM) that contains many elements including organic C, N, P, and K. These elements contribute nutrients for biogeochemical cycles within the ecosystem. This study was done to determine the ecological value of forest soil organic matter at tropical evergreen Aglaia-Streblus forest of Meru Betiri National Park (MBNP), East Java, Indonesia. The data were sampled along gradient topography in Pringtali tropical forest of TMBNP. Direct measurements of soil moisture, temperature, and pH were taken in the field. The soil samples were extracted from 6 points of soil solum using soil auger, and then oven-dried to get value of dry-weight. The elements content of organic C, N, P, and K were analyzed and estimated at the laboratory. The ecoval of SOM was appraised using developed ecological valuation tool. The result showed that SOM contributed higher ecoval of organic C (66.03 Mg ha-1) than other elements. Compared to P and K elements, N had the highest stock of element content. However, comparing to other two tropical forest ecosystems of Asia the ecoval of SOM elements in TMBNP was relatively low because of its natural geomorphological features.The ecoval of SOM elements in TMBNP was relatively low because of its natural geomorphological features. The ecovals contributed about 2.440,64 - 6.955,50 USD or  31.271.923,73 - 89.120.837,23  IDR per hectare of ecological value (d) to the ecosystem. This value was mainly contributed by organic C stock in the TMBNP forest SOM. It means the forest SOM had higher element content of organic C than N, P, and K elements. This d value is an indicator for TMBNP to protect the SOM elements meaning protecting their resources to sustain the biogeochemical cycles in the forest ecosystem. All the management and policy correlated to this protected area should consider this valuable information for their plan and actions.

Effects of land use change on turnover and storage of soil organic matter in a tropical forest

2019 ◽  
Vol 446 (1-2) ◽  
pp. 425-439 ◽  
Author(s):  
Kazumichi Fujii ◽  
Sukartiningsih ◽  
Chie Hayakawa ◽  
Yoshiyuki Inagaki ◽  
Takashi Kosaki
Keyword(s):  
Land Use ◽  
Organic Matter ◽  
Soil Organic Matter ◽  
Land Use Change ◽  
Tropical Forest ◽  
Effects Of Land Use ◽  
And Storage

scholarly journals Seasonal changes in soil organic matter after a decade of nutrient addition in a lowland tropical forest

2015 ◽  
Vol 123 (1-2) ◽  
pp. 221-235 ◽  
Author(s):  
Benjamin L. Turner ◽  
Joseph B. Yavitt ◽  
Kyle E. Harms ◽  
Milton N. Garcia ◽  
S. Joseph Wright
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Tropical Forest ◽  
Seasonal Changes ◽  
Nutrient Addition ◽  
Lowland Tropical Forest
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