scholarly journals Influence of Long-Term Thinning on the Biomass Carbon and Soil Respiration in a Larch (Larix gmelinii) Forest in Northeastern China

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Huimei Wang ◽  
Wei Liu ◽  
Wenjie Wang ◽  
Yuangang Zu
Keyword(s):  
Soil Respiration ◽  
Temperature Sensitivity ◽  
Forest Ecosystems ◽  
Mineral Soil ◽  
Biomass Accumulation ◽  
Northeastern China ◽  
Microbial Composition ◽  
Litter Respiration ◽  
Few Data

Thinning management is used to improve timber production, but only a few data are available on how it influences ecosystem C sink capacity. This study aims to clarify the effects of thinning on C sinks of larch plantations, the most widespread forests in Northeastern China. Both C influx from biomass production and C efflux from each soil respiration component and its temperature sensitivity were determined for scaling-up ecosystem C sink estimation: microbial composition is measured for clarifying mechanism for respiratory changes from thinning treatment. Thinning management induced 6.23 mol C m−2 yr−1increase in biomass C, while the decrease in heterotrophic respiration (Rh) at the thinned sites (0.9 mol C m−2 yr−1) has enhanced 14% of this biomass C increase. This decrease inRhwas a sum of the 42% decrease (4.1 mol C m−2 yr−1) in litter respiration and 3.2 mol C m−2 yr−1more CO2efflux from mineral soil in thinned sites compared with unthinned control. Increases in temperature, temperature sensitivity, alteration of litters, and microbial composition may be responsible for the contrary changes inRhfrom mineral soil and litter respiration, respectively. These findings manifested that thinning management of larch plantations could enhance biomass accumulation and decrease respiratory efflux from soil, which resulted in the effectiveness improvement in sequestrating C in forest ecosystems.

scholarly journals Decreased carbon limitation of litter respiration in a mortality-affected piñon-juniper woodland

2012 ◽  
Vol 9 (10) ◽  
pp. 14475-14501 ◽  
Author(s):  
E. Berryman ◽  
J. D. Marshall ◽  
T. Rahn ◽  
M. Litvak ◽  
J. Butnor
Keyword(s):  
Soil Respiration ◽  
Temperature Sensitivity ◽  
Water Availability ◽  
Microbial Respiration ◽  
Mineral Soil ◽  
Substrate Availability ◽  
Litter Respiration ◽  
Labile C ◽  
Juniper Woodland ◽  
C Limitation

Abstract. Microbial respiration depends on microclimatic variables and carbon (C) substrate availability, all of which are altered when ecosystems experience major disturbance. Widespread tree mortality, currently affecting piñon-juniper ecosystems in Southwestern North America, may affect C substrate availability in several ways; for example, via litterfall pulses and loss of root exudation. To determine piñon mortality effects on C and water limitation of microbial respiration, we applied field amendments (sucrose and water) to two piñon-juniper sites in central New Mexico, USA: one with a recent (< 1 yr), experimentally-induced mortality event and a nearby site with live canopy. We monitored the respiration response to water and sucrose applications to the litter surface and to the underlying mineral soil surface, testing the following hypotheses: (1) soil respiration in a piñon-juniper woodland is water- and labile C-limited in both the litter layer and mineral soil; (2) water and sucrose applications increase temperature sensitivity of respiration; (3) the mortality-affected site will show a reduction in C limitation in the litter; (4) the mortality-affected site will show an enhancement of C limitation in the mineral soil. Litter respiration at both sites responded to increased water availability, yet surprisingly, mineral soil respiration was not limited by water. Temperature sensitivity was enhanced by some of the sucrose and water treatments. Consistent with hypothesis 3, C limitation of litter respiration was lower at the recent mortality site compared to the intact canopy site. Results following applications to the mineral soil suggest the presence of abiotic effects of increasing water availability, precluding our ability to measure labile C limitation in soil. Widespread piñon mortality may decrease labile C limitation of litter respiration, at least during the first growing season following mortality.

Temperature sensitivity of soil respiration in China’s forest ecosystems: Patterns and controls

2015 ◽  
Vol 93 ◽  
pp. 105-110 ◽  
Author(s):  
Zhenfeng Xu ◽  
Shishan Tang ◽  
Li Xiong ◽  
Wanqin Yang ◽  
Huajun Yin ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Temperature Sensitivity ◽  
Forest Ecosystems

Contrasting effects of long-term acid rain simulation on temperature sensitivity of soil respiration and enzymatic activities in a subtropical forest

2019 ◽  
Vol 20 (1) ◽  
pp. 412-424
Author(s):  
Shutao Chen ◽  
Lu Sun ◽  
Xu Zhang ◽  
Xiaoshuai Shen ◽  
Yifan Liu ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Acid Rain ◽  
Temperature Sensitivity ◽  
Subtropical Forest ◽  
Enzymatic Activities ◽  
Rain Simulation

Spatial heterogeneity of temperature sensitivity of soil respiration across China

2021 ◽  
Author(s):  
Zhihan Yang ◽  
Xiaolu Tang ◽  
Xinrui Luo ◽  
Yuehong Shi
Keyword(s):  
Soil Respiration ◽  
Soil Carbon ◽  
Temperature Sensitivity ◽  
Terrestrial Ecosystems ◽  
Mean Value ◽  
Field Observations ◽  
Climate Feedbacks ◽  
Tropical Areas ◽  
Model Efficiency

&lt;p&gt;Soil respiration (RS), consisting of soil autotrophic respiration (RA) and heterotrophic respiration (RH), is the largest outflux of CO&lt;sub&gt;2&lt;/sub&gt; from terrestrial ecosystems to the atmosphere. The temperature sensitivity (Q&lt;sub&gt;10&lt;/sub&gt;) of RS is a crucial role in benchmarking the intensity of terrestrial soil carbon-climate feedbacks. However, the heterogeneity of Q&lt;sub&gt;10&lt;/sub&gt; of RS has not been well explored. To fill this substantial knowledge gap, gridded long-term Q&lt;sub&gt;10&lt;/sub&gt; datasets of RS at 5 cm with a spatial resolution of 1 km were developed from 515 field observations using a random forest algorithm with the linkage of climate, soil and vegetation variables. Q&lt;sub&gt;10&lt;/sub&gt; of RA and RH were estimated based on the linear correlation between Q&lt;sub&gt;10&lt;/sub&gt; of RS and RA/RH. Field observations indicated that regardless of ecosystem types, Q&lt;sub&gt;10&lt;/sub&gt; of RS ranged from 1.54 to 4.17 with an average of 2.52. Q&lt;sub&gt;10&lt;/sub&gt; varied significantly among ecosystem types, with the highest mean value of 3.18 for shrubland, followed by wetland (2.66), grassland (2.49) and forest (2.48), whereas the lowest value of 2.14 was found in cropland. RF could well explain the spatial variability of Q&lt;sub&gt;10&lt;/sub&gt; of RS (model efficiency = 0.5). Temporally, Q&lt;sub&gt;10&lt;/sub&gt; of RS, RA and RH did not differ significantly (&lt;em&gt;p &lt;/em&gt;= 0.386). Spatially, Q&lt;sub&gt;10&lt;/sub&gt; of RS, RA and RH varied greatly. In different climatic zones, the plateau areas had the highest mean Q&lt;sub&gt;10&lt;/sub&gt; value of 2.88, followed by tropical areas (2.63), temperate areas (2.52), while the subtropical region had the lowest Q&lt;sub&gt;10&lt;/sub&gt; on average (2.37). The predicted mean Q&lt;sub&gt;10&lt;/sub&gt; of RS, RA and RH were 2.52, 2.29, 2.64, respectively, with strong spatial patterns, indicating that the traditional and constant Q&lt;sub&gt;10&lt;/sub&gt; of 2 may bring great uncertainties in understanding of soil carbon-climate feedbacks in a warming climate.&lt;/p&gt;

scholarly journals Effects of long-term nitrogen addition on soil respiration and its components in a boreal forest

2020 ◽  
Author(s):  
Guancheng Liu ◽  
Tong Liu ◽  
Guoyong Yan ◽  
Lei Wang ◽  
Xiaochun Wang ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Boreal Forest ◽  
Forest Ecosystems ◽  
Nitrogen Addition ◽  
N Deposition ◽  
Microbial Biomass C ◽  
N Addition ◽  
Soil C ◽  
C And N

Abstract Background Atmospheric nitrogen (N) deposition in boreal forest ecosystems increased gradually with the development of industry and agriculture, but the effects of N input on soil CO2 fluxes in these ecosystems were rarely reported in previous studies. To evaluate the effect of N addition on soil respiration is of great significance for understanding the distribution of soil carbon (C) on the N gradient in forest ecosystems.Results In this study, four treatment levels of N addition (0, 25, 50, 75 kg N ha− 1 yr− 1) were applied to natural Larix gmelinii forest in Greater Khingan Mountains of northeast China. We focused mainly on the dynamics of soil respiration (Rs), heterotrophic respiration (Rh), autotrophic respiration (Ra), microbial biomass C and N (MBC and MBN) and fine root biomass (FRB) in a growing season. We found that low N addition significant increased Rs, Rh and Ra, but with the increase of N addition, the promotion effect was gradually weakened. Medium N increased the temperature sensitivity (Q10) of Rs and Rh components, while medium N and high N significantly reduced the Q10 of Ra. Ra was positively correlated with FRB; Rh was positively correlated with soil MBC and MBN; and RS was probably driven by Ra from May to July, while by Rh in August and September.Conclusions Long-term N addition alleviated microbial N limitation, promoted soil respiration and accelerated soil C and N cycle in boreal forest ecosystems.

Partitioning soil respiration of temperate forest ecosystems in northeastern China

2006 ◽  
Vol 26 (6) ◽  
pp. 1640-1646 ◽  
Author(s):  
Jinyan Yang ◽  
Chuankuan Wang
Keyword(s):  
Soil Respiration ◽  
Temperate Forest ◽  
Forest Ecosystems ◽  
Northeastern China

scholarly journals Spatial variation and controlling factors of temperature sensitivity of soil respiration in forest ecosystems across China

2020 ◽  
Vol 44 (6) ◽  
pp. 687-698
Author(s):  
Jia-Jia ZHENG ◽  
Song-Yu HUANG ◽  
Xin JIA ◽  
Yun TIAN ◽  
Yu MU ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Spatial Variation ◽  
Temperature Sensitivity ◽  
Forest Ecosystems ◽  
Controlling Factors

scholarly journals Decreased carbon limitation of litter respiration in a mortality-affected piñon–juniper woodland

2013 ◽  
Vol 10 (3) ◽  
pp. 1625-1634 ◽  
Author(s):  
E. Berryman ◽  
J. D. Marshall ◽  
T. Rahn ◽  
M. Litvak ◽  
J. Butnor
Keyword(s):  
Soil Respiration ◽  
Microbial Respiration ◽  
Root Exudation ◽  
Mineral Soil ◽  
Carbon Limitation ◽  
Substrate Availability ◽  
Litter Respiration ◽  
Labile C ◽  
Juniper Woodland ◽  
C Limitation

Abstract. Microbial respiration depends on microclimatic variables and carbon (C) substrate availability, all of which are altered when ecosystems experience major disturbance. Widespread tree mortality, currently affecting piñon–juniper ecosystems in southwestern North America, may affect C substrate availability in several ways, for example, via litterfall pulses and loss of root exudation. To determine piñon mortality effects on C and water limitation of microbial respiration, we applied field amendments (sucrose and water) to two piñon–juniper sites in central New Mexico, USA: one with a recent (< 1 yr), experimentally induced mortality event and a nearby site with live canopy. We monitored the respiration response to water and sucrose applications to the litter surface and to the underlying mineral soil surface, testing the following hypotheses: (1) soil respiration in a piñon–juniper woodland is water- and labile C-limited in both the litter layer and mineral soil; (2) piñon mortality reduces the C limitation of litter respiration; and (3) piñon mortality enhances the C limitation of mineral soil respiration. Litter respiration at both sites responded to increased water availability, yet surprisingly, mineral soil respiration was not limited by water. Consistent with hypothesis 2, C limitation of litter respiration was lower at the recent mortality site compared to the intact canopy site. Applications to the mineral soil showed evidence of reduction in CO2 flux on the girdled site and a non-significant increase on the control. We speculate that the reduction may have been driven by water-induced carbonate dissolution, which serves as a sink for CO2 and would reduce the net flux. Widespread piñon mortality may decrease labile C limitation of litter respiration, at least during the first growing season following mortality.

Reply to “Comments on ‘Long-Term Soil Chemistry Changes in Aggrading Forest Ecosystems’”

1995 ◽  
Vol 59 (2) ◽  
pp. 569-569 ◽  
Author(s):  
Jennifer Donaldson Knoepp ◽  
Wayne T. Swank
Keyword(s):  
Soil Chemistry ◽  
Forest Ecosystems
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