Soil C and N dynamics and their non-additive responses to litter mixture under different moisture conditions from an alpine steppe soil, Northern Tibet

2018 ◽  
Vol 125 ◽  
pp. 231-238 ◽  
Author(s):  
Youchao Chen ◽  
Shuqin Ma ◽  
Jing Liu ◽  
Genwei Cheng ◽  
Xuyang Lu
2020 ◽  
Vol 452 (1-2) ◽  
pp. 217-231
Author(s):  
Jiao Feng ◽  
Fan Yang ◽  
Junjun Wu ◽  
Qiong Chen ◽  
Qian Zhang ◽  
...  

2010 ◽  
Vol 338 (1-2) ◽  
pp. 159-169 ◽  
Author(s):  
Roberta Gentile ◽  
Bernard Vanlauwe ◽  
Pauline Chivenge ◽  
Johan Six

Author(s):  
Enzhu Hu ◽  
Zhimin Ren ◽  
Xiaoke Wang ◽  
Hongxing Zhang ◽  
Weiwei Zhang

Abstract Elevated tropospheric ozone concentration ([O3]) may substantially influence the belowground processes of the terrestrial ecosystem. Nevertheless, a comprehensive and quantitative understanding of the responses of soil C and N dynamics to elevated [O3] remains elusive. In this study, the results of 41 peer-reviewed studies were synthesized using meta-analytic techniques, to quantify the impact of O3 on ten variables associated with soil C and N, i.e., total C (TC, including soil organic C), total N (TN), dissolved organic C (DOC), ammonia N (NH4 +), nitrate N (NO3 -), microbial biomass C (MBC) and N (MBN), rates of nitrification (NTF) and denitrification (DNF), as well as C/N ratio. The results depicted that all these variables showed significant changes (P < 0.05) with [O3] increased by 27.6 ± 18.7 nL/L (mean ± SD), including decreases in TC, DOC, TN, NH4 +, MBC, MBN and NTF, and increases in C/N, NO3 - and DNF. The effect sizes of TN, NTF, and DNF were significantly correlated with O3 fumigation level and experimental duration (P < 0.05). Soil pH and climate were essential in analyses of O3 impacts on soil C and N. However, the responses of most variables to elevated [O3] were generally independent of O3 fumigation method, terrestrial ecosystem type, and additional [CO2] exposure. The altered soil C and N dynamics under elevated [O3] may reduce its C sink capacity, and change soil N availability thus impact plant growth and enhance soil N losses.


2006 ◽  
Vol 38 (8) ◽  
pp. 2401-2410 ◽  
Author(s):  
Dariana N. Vargas ◽  
Mónica B. Bertiller ◽  
Jorge O. Ares ◽  
Analía L. Carrera ◽  
Claudia L. Sain

2006 ◽  
Vol 280 (1-2) ◽  
pp. 143-155 ◽  
Author(s):  
B. Govaerts ◽  
K. D. Sayre ◽  
J. M. Ceballos-Ramirez ◽  
M. L. Luna-Guido ◽  
A. Limon-Ortega ◽  
...  

2004 ◽  
Vol 34 (3) ◽  
pp. 509-518 ◽  
Author(s):  
J Bauhus ◽  
T Vor ◽  
N Bartsch ◽  
A Cowling

Despite the importance of gaps in the dynamics and management of many forest types, very little is known about the medium- to long-term soil C and N dynamics associated with this disturbance. This study was designed to test the hypothesis that gap creation and lime application, a routine measure in many European forests to ameliorate soil acidity, lead to accelerated litter decomposition and thus a reduction in the forest floor and soil C and N pools. Four gaps were created in 1989 in a mature European beech (Fagus sylvatica L.) forest on acid soil with a moder humus, and lime (3 t dolomite·ha–1) was applied to two of these and surrounding areas. Litter and fine-root decomposition was measured in 1992–1993 and 1996–1998 using litterbags. Forest floor (L, F, and H layers) and mineral soil (0–40 cm) C and N pools were determined in 1989 and 1997. Eight years following silvicultural treatments, there was no change in C and N over the entire forest soil profile including forest floor. Reductions in the F and H layers in limed gaps were compensated for by increases in soil C and N in the surface (0–10 cm) mineral soil. Decomposition of F litter was significantly accelerated in limed gaps, leading to the development of a mull–moder, whereas gap creation alone had no effect on mass loss of F material in litterbags. Gap size disturbances in this acid beech forest appear to have minimal influences on soil C and N stocks. However, when combined with liming, changes in the humus form and vertical distribution of soil C and N may occur.


2021 ◽  
Vol 756 ◽  
pp. 143845
Author(s):  
Shuirong Tang ◽  
Weiguo Cheng ◽  
Ronggui Hu ◽  
Julien Guigue ◽  
Satoshi Hattori ◽  
...  

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