Climatic Influence on Litter Decomposition: Methods and Some Results of a NW- European Transect

In this work, combined double Laplace transform and Adomian decomposition method is presented to solve nonlinear singular one dimensional thermo-elasticity coupled system. Moreover, the convergence proof of the double Laplace transform decomposition method applied to our problem. By using one example, our proposed method is illustrated and the obtained results are confirmed.

Download Full-text

Recent Developments in Domain Decomposition Methods

10.1007/978-3-642-56118-4 ◽

2002 ◽

Cited By ~ 13

Keyword(s):

Domain Decomposition ◽

Decomposition Methods ◽

Domain Decomposition Methods ◽

Recent Developments

Download Full-text

Effects of nitrogen deposition on litter decomposition and nutrient release mediated by litter types and seasonal change in a temperate forest

Canadian Journal of Soil Science ◽

10.1139/cjss-2019-0037 ◽

2020 ◽

Vol 100 (1) ◽

pp. 11-25 ◽

Cited By ~ 1

Author(s):

Guoyong Yan ◽

Xiongde Dong ◽

Binbin Huang ◽

Honglin Wang ◽

Ziming Hong ◽

...

Keyword(s):

Mass Loss ◽

Litter Decomposition ◽

Nutrient Release ◽

N Deposition ◽

Pinus Koraiensis ◽

N Addition ◽

Entire Study ◽

Mixed Litter ◽

Negative Effect ◽

Four Levels

We conducted a field experiment with four levels of simulated nitrogen (N) deposition (0, 2.5, 5, and 7.5 g N m−2 yr−1, respectively) to investigate the response of litter decomposition of Pinus koraiensis (PK), Tilia amurensis (TA), and their mixture to N deposition during winter and growing seasons. Results showed that N addition significantly increased the mass loss of PK litter and significantly decreased the mass loss of TA litter throughout the 2 yr decomposition processes, which indicated that the different responses in the decomposition of different litters to N addition can be species specific, potentially attributed to different litter chemistry. The faster decomposition of PK litter with N addition occurred mainly in the winter, whereas the slower decomposition of TA litter with N addition occurred during the growing season. Moreover, N addition had a positive effect on the release of phosphorus, magnesium, and manganese for PK litter and had a negative effect on the release of carbon, iron, and lignin for TA litter. Decomposition and nutrient release from mixed litter with N addition showed a non-additive effect. The mass loss from litter in the first winter and over the entire study correlated positively with the initial concentration of cellulose, lignin, and certain nutrients in the litter, demonstrating the potential influence of different tissue chemistries.

Download Full-text

Ants accelerate litter decomposition in a Costa Rican lowland tropical rain forest

Journal of Tropical Ecology ◽

10.1017/s0266467412000375 ◽

2012 ◽

Vol 28 (5) ◽

pp. 437-443 ◽

Cited By ~ 15

Author(s):

Terrence P. McGlynn ◽

Evan K. Poirson

Keyword(s):

Mass Loss ◽

Leaf Litter ◽

Litter Decomposition ◽

Rain Forest ◽

Costa Rican ◽

Tropical Rain Forests ◽

Rain Forests ◽

Food Web Structure ◽

Litter Bags ◽

Lowland Rain Forest

Abstract:The decomposition of leaf litter is governed, in part, by litter invertebrates. In tropical rain forests, ants are dominant predators in the leaf litter and may alter litter decomposition through the action of a top-down control of food web structure. The role of ants in litter decomposition was investigated in a Costa Rican lowland rain forest with two experiments. In a mesocosm experiment, we manipulated ant presence in 50 ambient leaf-litter mesocosms. In a litterbag gradient experiment, Cecropia obtusifolia litter was used to measure decomposition rate constants across gradients in nutrients, ant density and richness, with 27 separate litterbag treatments for total arthropod exclusion or partial arthropod exclusion. After 2 mo, mass loss in mesocosms containing ants was 30.9%, significantly greater than the 23.5% mass loss in mesocosms without ants. In the litter bags with all arthropods excluded, decomposition was best accounted by the carbon: phosphorus content of soil (r2 = 0.41). In litter bags permitting smaller arthropods but excluding ants, decomposition was best explained by the local biomass of ants in the vicinity of the litter bags (r2 = 0.50). Once the microarthropod prey of ants are permitted to enter litterbags, the biomass of ants near the litterbags overtakes soil chemistry as the regulator of decomposition. In concert, these results support a working hypothesis that litter-dwelling ants are responsible for accelerating litter decomposition in lowland tropical rain forests.

Download Full-text

A Note on the Decomposition Methods for Support Vector Regression

Neural Computation ◽

10.1162/089976602753712936 ◽

2002 ◽

Vol 14 (6) ◽

pp. 1267-1281 ◽

Cited By ~ 14

Author(s):

Shuo-Peng Liao ◽

Hsuan-Tien Lin ◽

Chih-Jen Lin

Keyword(s):

Support Vector Regression ◽

Decomposition Method ◽

Decomposition Methods ◽

Support Vector ◽

Dual Formulation ◽

Working Set ◽

Number Of Iterations

The dual formulation of support vector regression involves two closely related sets of variables. When the decomposition method is used, many existing approaches use pairs of indices from these two sets as the working set. Basically, they select a base set first and then expand it so all indices are pairs. This makes the implementation different from that for support vector classification. In addition, a larger optimization subproblem has to be solved in each iteration. We provide theoretical proofs and conduct experiments to show that using the base set as the working set leads to similar convergence (number of iterations). Therefore, by using a smaller working set while keeping a similar number of iterations, the program can be simpler and more efficient.

Download Full-text