Root–microbial interaction accelerates soil nitrogen depletion but not soil carbon after increasing litter inputs to a coniferous forest

Lyu, Maokui; Li, Xiaojie; Xie, Jinsheng; Homyak, Peter M.; Ukonmaanaho, Liisa; Yang, Zhijie; Liu, Xiaofei; Ruan, Chaoyue; Yang, Yusheng

doi:10.1007/s11104-019-04265-w

Cited by 25 publications

(16 citation statements)

References 76 publications

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“…Molles et al (1995) also found that compared with the terrestrial environment, in wetland, water promotes litter leaching and microbial metabolism, thereby accelerating litter decomposition. Moreover, water infiltration into litter also increases relative leaching loss (Molles et al, 1995). Here, the high litter decomposition rate measured for the +25 cm water level treatment may be explained primarily by litter leaching.…”

Section: Environmental Control Of Litter Decompositionmentioning

confidence: 94%

“…Related research showed that the wetland water level strongly affects litter leaching and microbial decomposition (Peltoniemi et al, 2012). Molles et al (1995) also found that compared with the terrestrial environment, in wetland, water promotes litter leaching and microbial metabolism, thereby accelerating litter decomposition. Moreover, water infiltration into litter also increases relative leaching loss (Molles et al, 1995).…”

Section: Environmental Control Of Litter Decompositionmentioning

confidence: 99%

“…Nevertheless, we considered mainly aboveground litter in this experiment. Hence, the influence of underground litter (root) decomposition on the SOC pool should be inves-tigated in future research (Sokol and Bradford, 2019;Lyu et al, 2019).…”

Section: Contribution Of Leaf Decomposition To the Soil Surface Carbomentioning

confidence: 99%

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Factors controlling Carex brevicuspis leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

et al. 2021

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Abstract. Litter decomposition plays a vital role in wetland carbon cycling. However, the contribution of aboveground litter decomposition to the wetland soil organic carbon (SOC) pool has not yet been quantified. Here, we conducted a Carex brevicuspis leaf litter input experiment to clarify the intrinsic factors controlling litter decomposition and quantify its contribution to the SOC pool at different water levels. The Carex genus is ubiquitous in global freshwater wetlands. We sampled this plant leaf litter at −25, 0, and +25 cm relative to the soil surface over 280 d and analysed leaf litter decomposition and its contribution to the SOC pool. The percentage litter dry weight loss and the instantaneous litter dry weight decomposition rate were the highest at +25 cm water level (61.8 %, 0.01307 d−1), followed by the 0 cm water level (49.8 %, 0.00908 d−1), and the lowest at −25 cm water level (32.4 %, 0.00527 d−1). Significant amounts of litter carbon, nitrogen, and phosphorus were released at all three water levels. Litter input significantly increased the soil microbial biomass and fungal density but had nonsignificant impacts on soil bacteria, actinomycetes, and the fungal∕bacterial concentrations at all three water levels. Compared with litter removal, litter addition increased the SOC by 16.93 %, 9.44 %, and 2.51 % at the +25, 0, and −25 cm water levels, respectively. Hence, higher water levels facilitate the release of organic carbon from leaf litter into the soil via water leaching. In this way, they increase the soil carbon pool. At lower water levels, soil carbon is lost due to the slower litter decomposition rate and active microbial (actinomycete) respiration. Our results revealed that the water level in natural wetlands influenced litter decomposition mainly by leaching and microbial activity, by extension, and affected the wetland surface carbon pool.

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Section: Environmental Control Of Litter Decompositionmentioning

confidence: 94%

Section: Environmental Control Of Litter Decompositionmentioning

confidence: 99%

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Factors controlling Carex brevicuspis leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

et al. 2021

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“…Nevertheless, we considered mainly aboveground litters in this experiment. Hence, the influences of underground litter (root) decomposition on the SOC pool should be investigated in future research (Sokol and Bradford, 2019;Lyu et al, 2019).…”

Section: Contribution Of Leaf Decomposition To the Soil Surface Carbon Poolmentioning

confidence: 99%

Factors controlling Carex brevicuspis leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Dou¹,

Deng²,

Xie³

et al. 2020

Preprint

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Abstract. Litter decomposition plays a vital role in wetland carbon cycling. However, the contribution of aboveground litter decomposition to the wetland soil organic carbon (SOC) pool has not yet been quantified. Here, we conducted a Carex brevicuspis leaf litter input experiment to clarify the intrinsic factors controlling litter decomposition and quantify it's contribution to SOC pool at different water levels. This species is ubiquitous to global freshwater wetlands. We sampled this plant leaf litter at −25, 0, and +25 cm relative to the soil surface over 280 days and analysed leaf litter decomposition and its contribution to the SOC pool. The mass loss and carbon release rates were the highest at +25 cm water level, followed by the 0 cm water level. The rates of these parameters were the lowest at −25 cm water level. Significant amounts of litter carbon, nitrogen, and phosphorus were released at all three water levels. Litter input significantly increased the soil microbial biomass and fungal density but had nonsignificant impacts on soil bacteria, actinomycetes, and fungal/bacterial concentrations at all three water levels. Compared with litter removal, litter application increased the SOC by 25.12 %, 9.58 %, and 4.98 % at the +25 cm, 0 cm, and −25 cm water levels, respectively. Hence, higher water levels facilitate the release of organic carbon from leaf litter into the soil via water leaching. In this way, they strengthen the soil carbon pool. At lower water levels, soil carbon is lost as the slower litter decomposition rate and active microbial (actinomycete) respiration. Our results revealed that the water level in natural wetlands influences litter decomposition mainly by leaching and microbial activity, by extension, affects wetland surface carbon pool.

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“…Soil microorganisms can not only transform plant-derived organic matter into soil organic matter by participating in litter decomposition and their own metabolic activities [ 33 ], but also affect the process of soil C and N degradation [ 34 ]. Previous studies indicated that increased microbial activity can accelerate the decomposition of soil C and N [ 35 , 36 ]. In addition, changes in plant detritus can affect soil microbial activity and community structure by altering soil nutrient availability and stability [ 37 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of litter and root manipulations on soil carbon and nitrogen in a Schrenk’s spruce (Picea schrenkiana) forest

et al. 2021

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Plant detritus represents the major source of soil carbon (C) and nitrogen (N), and changes in its quantity can influence below-ground biogeochemical processes in forests. However, we lack a mechanistic understanding of how above- and belowground detrital inputs affect soil C and N in mountain forests in an arid land. Here, we explored the effects of litter and root manipulations (control (CK), doubled litter input (DL), removal of litter (NL), root exclusion (NR), and a combination of litter removal and root exclusion (NI)) on soil C and N concentrations, enzyme activity and microbial biomass during a 2-year field experiment. We found that DL had no significant effect on soil total organic carbon (SOC) and total nitrogen (TN) but significantly increased soil dissolved organic carbon (DOC), microbial biomass C, N and inorganic N as well as soil cellulase, phosphatase and peroxidase activities. Conversely, NL and NR reduced soil C and N concentrations and enzyme activities. We also found an increase in the biomass of soil bacteria, fungi and actinomycetes in the DL treatment, while NL reduced the biomass of gram-positive bacteria, gram-negative bacteria and fungi by 5.15%, 17.50% and 14.17%, respectively. The NR decreased the biomass of these three taxonomic groups by 8.97%, 22.11% and 21.36%, respectively. Correlation analysis showed that soil biotic factors (enzyme activity and microbial biomass) and abiotic factors (soil moisture content) significantly controlled the change in soil C and N concentrations (P < 0.01). In brief, we found that the short-term input of plant detritus could markedly affect the concentrations and biological characteristics of the C and N fractions in soil. The removal experiment indicated that the contribution of roots to soil nutrients is greater than that of the litter.

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Root–microbial interaction accelerates soil nitrogen depletion but not soil carbon after increasing litter inputs to a coniferous forest

Cited by 25 publications

References 76 publications

Factors controlling <i>Carex brevicuspis</i> leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Factors controlling <i>Carex brevicuspis</i> leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Factors controlling <i>Carex brevicuspis</i> leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Effects of litter and root manipulations on soil carbon and nitrogen in a Schrenk’s spruce (Picea schrenkiana) forest

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Root–microbial interaction accelerates soil nitrogen depletion but not soil carbon after increasing litter inputs to a coniferous forest

Cited by 25 publications

References 76 publications

Factors controlling &lt;i&gt;Carex brevicuspis&lt;/i&gt; leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Factors controlling &lt;i&gt;Carex brevicuspis&lt;/i&gt; leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Factors controlling &lt;i&gt;Carex brevicuspis&lt;/i&gt; leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Effects of litter and root manipulations on soil carbon and nitrogen in a Schrenk’s spruce (Picea schrenkiana) forest

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Factors controlling <i>Carex brevicuspis</i> leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Factors controlling <i>Carex brevicuspis</i> leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels

Factors controlling <i>Carex brevicuspis</i> leaf litter decomposition and its contribution to surface soil organic carbon pool at different water levels