Details
| Original language | English |
|---|---|
| Pages (from-to) | 51-57 |
| Number of pages | 7 |
| Journal | Applied soil ecology |
| Volume | 127 |
| Early online date | 12 Mar 2018 |
| Publication status | Published - Jun 2018 |
Abstract
Paddy soils have experienced intensive fertilization in recent decades. However, our understanding of the effects of fertilization on the carbon (C) cycle remains incomplete. In the present study, we investigated soil organic matter (SOM) decomposition in a 60-day incubation in response to N, P, K, Ca, and S addition to nutrient-limited paddy soil at three low and three high concentrations. High levels of nutrient addition decreased CO2 emission, qCO2, and microbial biomass. CO2 emissions increased (12–17%) owing to low levels of nutrient addition, whereas it decreased (3–21%) in response to high levels of nutrient addition. Microbial biomass and nutrient turnover rates increased after low levels of nutrient addition. Positive priming effect occurs under nutrient-limited conditions owing to the stimulation of microbial biomass production after low amount of exogenous nutrient input. In contrast, high levels of nutrient addition decreased microbial biomass and net N mineralization. This high N, P, K, Ca, and S addition could satisfy the needs of microbial growth, thereby decreasing the dependency of the organisms on the original nutrients from SOM decomposition. Therefore, negative priming was observed after high-level nutrient addition. In conclusion, intensive fertilization (with N, P, K, Ca, and S) reduces SOM decomposition through increased microbial turnover in paddy soils, which might positively affect C sequestration.
Keywords
- Microbial biomass turnover, N mineralization, Nutrient addition, Paddy soil, Priming effect
ASJC Scopus subject areas
- Environmental Science(all)
- Ecology
- Agricultural and Biological Sciences(all)
- Agricultural and Biological Sciences (miscellaneous)
- Agricultural and Biological Sciences(all)
- Soil Science
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In: Applied soil ecology, Vol. 127, 06.2018, p. 51-57.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Intensive fertilization (N, P, K, Ca, and S) decreases organic matter decomposition in paddy soil
AU - Liu, Yuhuai
AU - Zang, Huadong
AU - Ge, Tida
AU - Bai, Jing
AU - Lu, Shunbao
AU - Zhou, Ping
AU - Peng, Peiqing
AU - Shibistova, Olga
AU - Zhu, Zhenke
AU - Wu, Jinshui
AU - Guggenberger, Georg
N1 - © 2018 Elsevier B.V. All rights reserved.
PY - 2018/6
Y1 - 2018/6
N2 - Paddy soils have experienced intensive fertilization in recent decades. However, our understanding of the effects of fertilization on the carbon (C) cycle remains incomplete. In the present study, we investigated soil organic matter (SOM) decomposition in a 60-day incubation in response to N, P, K, Ca, and S addition to nutrient-limited paddy soil at three low and three high concentrations. High levels of nutrient addition decreased CO2 emission, qCO2, and microbial biomass. CO2 emissions increased (12–17%) owing to low levels of nutrient addition, whereas it decreased (3–21%) in response to high levels of nutrient addition. Microbial biomass and nutrient turnover rates increased after low levels of nutrient addition. Positive priming effect occurs under nutrient-limited conditions owing to the stimulation of microbial biomass production after low amount of exogenous nutrient input. In contrast, high levels of nutrient addition decreased microbial biomass and net N mineralization. This high N, P, K, Ca, and S addition could satisfy the needs of microbial growth, thereby decreasing the dependency of the organisms on the original nutrients from SOM decomposition. Therefore, negative priming was observed after high-level nutrient addition. In conclusion, intensive fertilization (with N, P, K, Ca, and S) reduces SOM decomposition through increased microbial turnover in paddy soils, which might positively affect C sequestration.
AB - Paddy soils have experienced intensive fertilization in recent decades. However, our understanding of the effects of fertilization on the carbon (C) cycle remains incomplete. In the present study, we investigated soil organic matter (SOM) decomposition in a 60-day incubation in response to N, P, K, Ca, and S addition to nutrient-limited paddy soil at three low and three high concentrations. High levels of nutrient addition decreased CO2 emission, qCO2, and microbial biomass. CO2 emissions increased (12–17%) owing to low levels of nutrient addition, whereas it decreased (3–21%) in response to high levels of nutrient addition. Microbial biomass and nutrient turnover rates increased after low levels of nutrient addition. Positive priming effect occurs under nutrient-limited conditions owing to the stimulation of microbial biomass production after low amount of exogenous nutrient input. In contrast, high levels of nutrient addition decreased microbial biomass and net N mineralization. This high N, P, K, Ca, and S addition could satisfy the needs of microbial growth, thereby decreasing the dependency of the organisms on the original nutrients from SOM decomposition. Therefore, negative priming was observed after high-level nutrient addition. In conclusion, intensive fertilization (with N, P, K, Ca, and S) reduces SOM decomposition through increased microbial turnover in paddy soils, which might positively affect C sequestration.
KW - Microbial biomass turnover
KW - N mineralization
KW - Nutrient addition
KW - Paddy soil
KW - Priming effect
UR - http://www.scopus.com/inward/record.url?scp=85043393914&partnerID=8YFLogxK
U2 - 10.1016/j.apsoil.2018.02.012
DO - 10.1016/j.apsoil.2018.02.012
M3 - Article
AN - SCOPUS:85043393914
VL - 127
SP - 51
EP - 57
JO - Applied soil ecology
JF - Applied soil ecology
SN - 0929-1393
ER -