scholarly journals CO2 enrichment and N addition increase nutrient loss from decomposing leaf litter in subtropical model forest ecosystems

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Juxiu Liu ◽  
Xiong Fang ◽  
Qi Deng ◽  
Tianfeng Han ◽  
Wenjuan Huang ◽  
...  
Keyword(s):  
Leaf Litter ◽  
Forest Ecosystems ◽  
Co2 Enrichment ◽  
Nutrient Loss ◽  
N Addition

scholarly journals Responses of soil respiration to elevated carbon dioxide and nitrogen addition in young subtropical forest ecosystems in China

2010 ◽  
Vol 7 (1) ◽  
pp. 315-328 ◽  
Author(s):  
Q. Deng ◽  
G. Zhou ◽  
J. Liu ◽  
S. Liu ◽  
H. Duan ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Elevated Co2 ◽  
Forest Ecosystems ◽  
N Deposition ◽  
Subtropical Forest ◽  
N Addition ◽  
Above Ground Biomass ◽  
Respiration Rates ◽  
Ambient Co2 ◽  
Ambient N Deposition

Abstract. Global climate change in the real world always exhibits simultaneous changes in multiple factors. Prediction of ecosystem responses to multi-factor global changes in a future world strongly relies on our understanding of their interactions. However, it is still unclear how nitrogen (N) deposition and elevated atmospheric carbon dioxide concentration [CO2] would interactively influence forest floor soil respiration in subtropical China. We assessed the main and interactive effects of elevated [CO2] and N addition on soil respiration by growing tree seedlings in ten large open-top chambers under CO2 (ambient CO2 and 700 μmol mol−1) and nitrogen (ambient and 100 kg N ha−1 yr−1) treatments. Soil respiration, soil temperature and soil moisture were measured for 30 months, as well as above-ground biomass, root biomass and soil organic matter (SOM). Results showed that soil respiration displayed strong seasonal patterns with higher values observed in the wet season (April–September) and lower values in the dry season (October–March) in all treatments. Significant exponential relationships between soil respiration rates and soil temperatures, as well as significant linear relationships between soil respiration rates and soil moistures (below 15%) were found. Both CO2 and N treatments significantly affected soil respiration, and there was significant interaction between elevated [CO2] and N addition (p<0.001, p=0.003, and p=0.006, respectively). We also observed that the stimulatory effect of individual elevated [CO2] (about 29% increased) was maintained throughout the experimental period. The positive effect of N addition was found only in 2006 (8.17% increased), and then had been weakened over time. Their combined effect on soil respiration (about 50% increased) was greater than the impact of either one alone. Mean value of annual soil respiration was 5.32 ± 0.08, 4.54 ± 0.10, 3.56 ± 0.03 and 3.53 ± 0.03 kg CO2 m−2 yr−1 in the chambers exposed to elevated [CO2] and high N deposition (CN), elevated [CO2] and ambient N deposition (CC), ambient [CO2] and high N deposition (NN), and ambient [CO2] and ambient N deposition (CK as a control), respectively. Greater above-ground biomass and root biomass was obtained in the CN, CC and NN treatments, and higher soil organic matter was observed only in the CN treatment. In conclusion, the combined effect of elevated [CO2] and N addition on soil respiration was apparent interaction. They should be evaluated in combination in subtropical forest ecosystems in China where the atmospheric CO2 and N deposition have been increasing simultaneously and remarkably.

scholarly journals Effect of biochar addition on leaf-litter decomposition at soil surface during three years in a warm-temperate secondary deciduous forest, Japan

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yukiya Minamino ◽  
Nobuhide Fujitake ◽  
Takeshi Suzuki ◽  
Shinpei Yoshitake ◽  
Hiroshi Koizumi ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Leaf Litter ◽  
Litter Decomposition ◽  
Forest Floor ◽  
Nutrient Dynamics ◽  
Forest Ecosystems ◽  
Deciduous Forest ◽  
Soil Surface ◽  
Leaf Litter Decomposition ◽  
Dry Conditions

AbstractThe addition of biochar to the forest floor should facilitate efficient carbon sequestration. However, little is known about how biochar addition effects litter decomposition, which is related to carbon and nutrient dynamics in forest ecosystems. This study evaluated the effect of biochar addition on leaf litter decomposition in a forest ecosystem. To examine whether leaf litter decomposition was stimulated above and below biochar, litterbag experiments were carried out for about 3 years in a field site where biochar was added at the rate of 0, 5 and 10 t ha−¹ (C0, C5 and C10 plots) to the forest floor in a temperate oak forest, Japan. Biochar addition at C10 significantly enhanced litter decomposition below biochar for 2 years after treatment and above biochar for 1 year after treatment. Litter water content in biochar plots tended to increase under dry conditions. Biochar addition enhanced litter decomposition because of increased microbial activity with increased moisture content and accelerated the decomposition progress rather than changing the decomposition pattern. However, the carbon emission through changing leaf litter decomposition was small when compared with the carbon addition by biochar, indicating that biochar could be an effective material for carbon sequestration in forest ecosystems.

scholarly journals Mass and Nutrient Loss of Leaf Litter Collecting in Littertraps: An In Situ and Ex Situ Study

2013 ◽  
Vol 59 (4) ◽  
pp. 484-493 ◽  
Author(s):  
Cassie Corrigan ◽  
Maren Oelbermann
Keyword(s):  
Leaf Litter ◽  
Nutrient Loss ◽  
Ex Situ

scholarly journals Litter Production and Organic Compound Contents in the Sudano-guinea Savannahs of Ngaoundere, Adamawa, Cameroon

2020 ◽  
pp. 1-14
Author(s):  
Adamou Ibrahima ◽  
Paul Souhore ◽  
Ahmadou Babba
Keyword(s):  
Phenolic Compounds ◽  
Organic Compound ◽  
Nutrient Cycling ◽  
Organic Compounds ◽  
Leaf Litter ◽  
Plant Species ◽  
Plant Diversity ◽  
Forest Ecosystems ◽  
Litter Production ◽  
Cellulose Content

Litter production which is important for understanding nutrient cycling and assessing productivity in forest ecosystems is poorly studied in the African savannahs, particularly in the savannahs of Cameroon. Thus, litter production and organic compounds of the thirty-six (36) contrasting plant species were studied in the Sudano-guinea savannahs of Ngaoundere, Cameroon. Litter collected in framework of 50 cm x 50 cm under the three tree of each plant species in three sites of the savannahs of Ngaoundere during the period of their maximum fall that from November and January. After two years of collection, mean annual litter production varied from 0.36 in S. longipedunculata to 10.06 t.ha-1.year-1 in F. polita at Dang, from 0.14 in G. aqualla to 9.39 t.ha-1.year-1 in V. paradoxa at Biskewal, and from 0.35 in G. aqualla to 3.64 t.ha-1.year-1 in S. guineense var. macrocarpum at Wakwa. Contribution of leaf litter, fruits and wood were respectively more than 50%, 1.40% and 32% to the total litter. Litter production varied from 2.35 t.ha-1.year-1 at Wakwa to 2.91 t.ha-1.year-1 at Dang, but the sites did not differ significantly among them. Litter cellulose content varied from 4.11 in P. hookeri to 11.84% in V. doniana, that of lignin from 2.28 in V. paradoxa to 8.12% in V. doniana, that of NDF from 21.35 in S. guineense var. guineense to 75.73% in S. guineense var. macrocarpum, and that of phenolic compounds from 0.47 in V. doniana to 16.11% in C. molle. Litter production and organic compounds content were affected by plant diversity, but not by sites in the Sudano-guinea savannahs of Ngaoundere, Cameroon. These results would contribute to well select plant species for their domestication and to management of Adamawa savannahs of Cameroon.

scholarly journals Екологічна структура угрупувань панцирних кліщів (Acariformes, Oribatei) ділянок рекультивації м. Жовті Води Дніпропетровської області

2010 ◽  
Vol 1 (2) ◽  
pp. 101-110
Author(s):  
А. D. Shtirts ◽  
Y. L. Kul’bachko ◽  
А. V. Nikitenko ◽  
О. A. Didur
Keyword(s):  
Leaf Litter ◽  
Forest Ecosystems ◽  
Life Form ◽  
Positive Influence ◽  
Ecological Structure ◽  
Technogenic Landscapes

Taxonomical composition and ecological structure of Oribatei associates in recultivated territories  located near Zhovti Vody town are investigated. The artificial arboreal planting causes increase of oribatida number in comparison with recultivated areas without arbors. Planting of trees and presence of the leaf litter promote to redistribution of oribatida life-form and change of structure in their complexes. The positive influence of artificial forest ecosystems in technogenic landscapes of different stages of technical remediation on forming of Oribatei ecological structure is shown.

scholarly journals CO<sub>2</sub> enrichment increases nutrient leaching from model forest ecosystems in subtropical China

2008 ◽  
Vol 5 (3) ◽  
pp. 2679-2706 ◽  
Author(s):  
J. X. Liu ◽  
D. Q. Zhang ◽  
G. Y. Zhou ◽  
B. Faivre-Vuillin ◽  
Q. Deng ◽  
...  
Keyword(s):  
Elevated Co2 ◽  
Forest Ecosystems ◽  
Co2 Concentration ◽  
Nutrient Leaching ◽  
Mineral Nutrient ◽  
N Addition ◽  
Nutrient Losses ◽  
Subtropical China ◽  
Leaching Losses ◽  
High Co2

Abstract. The effect of high atmospheric CO2 concentrations on the dynamics of mineral nutrient is not well documented, especially for subtropical China. We used model forest ecosystems in open-top chambers to study the effects of CO2 enrichment alone and together with N addition on the dynamics of soil cations and anions. Two years of exposure to a 700 ppm CO2 atmospheric concentration resulted in increased annual nutrient losses by leaching below 70 cm soil profile. Compared to the control, net Mg2+ losses increased by 385%, K+ by 223%, Ca2+ by 167% and N-NO3- by 108%, respectively. Increased losses following exposure to elevated CO2 were related to both faster soil weathering/organic matter decomposition and greater amounts of water leaching during high rainfall as a consequence of higher soil moisture. Net annual nutrient losses in the high CO2 concentration chambers reached 22.2 kg ha−1 year−1 for K+, 171.3 kg ha−1 year−1 for Ca2+, 8.2 kg ha−1 year−1 for Mg2+ and about 2 kg ha−1 year−1 for N-NO3-. The N addition alone had no significant effect on the mineral nutrient leaching losses. However, addition of N together with the high CO2 treatment significantly reduced mineral nutrient losses. We hypothesize that forests in subtropical China might suffer nutrient limitation and reduction in plant biomass under elevated CO2 concentration due to mineral leaching losses in the future.

scholarly journals Response of litter decomposition and the soil environment to one-year nitrogen addition in a Schrenk spruce forest in the Tianshan Mountains, China

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhaolong Ding ◽  
Xu Liu ◽  
Lu Gong ◽  
Xin Chen ◽  
Jingjing Zhao ◽  
...  
Keyword(s):  
Nitrogen Deposition ◽  
Litter Decomposition ◽  
Forest Ecosystems ◽  
N Deposition ◽  
Tianshan Mountains ◽  
Control Treatment ◽  
N Addition ◽  
Soil Environment ◽  
N Application ◽  
Positive Effect

AbstractHuman activities have increased the input of nitrogen (N) to forest ecosystems and have greatly affected litter decomposition and the soil environment. But differences in forests with different nitrogen deposition backgrounds. To better understand the response of litter decomposition and soil environment of N-limited forest to nitrogen deposition. We established an in situ experiment to simulate the effects of N deposition on soil and litter ecosystem processes in a Picea schrenkiana forest in the Tianshan Mountains, China. This study included four N treatments: control (no N addition), low N addition (LN: 5 kg N ha−1 a−1), medium N addition (MN: 10 kg N ha−1 a−1) and high N addition (HN: 20 kg N ha−1 a−1). Our results showed that N addition had a significant effect on litter decomposition and the soil environment. Litter mass loss in the LN treatment and in the MN treatment was significantly higher than that in the control treatment. In contrast, the amount of litter lost in the HN treatment was significantly lower than the other treatments. N application inhibited the degradation of lignin but promoted the breakdown of cellulose. The carbon (C), N, and phosphorus (P) contents of litter did not differ significantly among the treatments, but LN promoted the release of C and P. Our results also showed that soil pH decreased with increasing nitrogen application rates, while soil enzyme activity showed the opposite trend. In addition, the results of redundancy analysis (RDA) and correlation analyses showed that the soil environment was closely related to litter decomposition. Soil enzymes had a positive effect on litter decomposition rates, and N addition amplified these correlations. Our study confirmed that N application had effects on litter decomposition and the soil environment in a N-limited P. schrenkiana forest. LN had a strong positive effect on litter decomposition and the soil environment, while HN was significantly negative. Therefore, increased N deposition may have a negative effect on material cycling of similar forest ecosystems in the near future.

scholarly journals The Role of Quantitative Traits of Leaf Litter on Decomposition and Nutrient Cycling of the Forest Ecosystems

2013 ◽  
Vol 29 (1) ◽  
pp. 38-48 ◽  
Author(s):  
Mohammed Mahabubur Rahman ◽  
Jiro Tsukamoto ◽  
Yuji Tokumoto ◽  
Md. Ashikur Rahman Shuvo
Keyword(s):  
Nutrient Cycling ◽  
Leaf Litter ◽  
Quantitative Traits ◽  
Forest Ecosystems

scholarly journals Leaf litter decomposition rates increase with rising mean annual temperature in Hawaiian tropical montane wet forests

2014 ◽  
Author(s):  
Lori D Bothwell ◽  
Paul C Selmants ◽  
Christian P Giardina ◽  
Creighton M. Litton
Keyword(s):  
Leaf Litter ◽  
Litter Decomposition ◽  
Forest Ecosystems ◽  
Net Primary Productivity ◽  
Nutrient Release ◽  
Leaf Litter Decomposition ◽  
Mean Annual Temperature ◽  
Decomposition Rates ◽  
Litter Decay ◽  
Wet Forests

Decomposing litter in forest ecosystems supplies nutrients to plants, carbon to heterotrophic soil microorganisms and is a large source of CO2 to the atmosphere. Despite its essential role in carbon and nutrient cycling, the temperature sensitivity of leaf litter decay in tropical forest ecosystems remains poorly resolved, especially in tropical montane wet forests where the warming trend may be amplified compared to tropical wet forests at lower elevations. We quantified leaf litter decomposition rates along a highly constrained 5.2 °C mean annual temperature (MAT) gradient in tropical montane wet forests on the Island of Hawaii. Dominant vegetation, substrate type and age, soil moisture, and disturbance history are all nearly constant across this gradient, allowing us to isolate the effect of rising MAT on leaf litter decomposition and nutrient release. Leaf litter decomposition rates were a positive linear function of MAT, causing the residence time of leaf litter on the forest floor to decline by ~31 days for each 1 °C increase in MAT. Our estimate of the Q10 temperature coefficient for leaf litter decomposition was 2.17, within the commonly reported range for heterotrophic organic matter decomposition (1.5 – 2.5) across a broad range of ecosystems. The percentage of leaf litter nitrogen (N) remaining after six months declined linearly with increasing MAT from ~ 88% of initial N at the coolest site to ~74% at the warmest site. The lack of net N immobilization during all three litter collection periods at all MAT plots indicates that N was not limiting to leaf litter decomposition, regardless of temperature. These results suggest that leaf litter decay in tropical montane wet forests may be more sensitive to rising MAT than in tropical lowland wet forests, and that increased rates of N release from decomposing litter could delay or prevent progressive N limitation to net primary productivity with climate warming.

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