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| Effects of Land Use and Fertilization on Lignin Accumulation in Red Soil |
| Received:March 20, 2015 |
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| KeyWord:long-term fertilization;land use;red soil;lignin;monomer;accumulation characteristics |
| Author Name | Affiliation | E-mail | | FENG Shu-zhen | The Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Graduate School of Chinese Academy of Sciences, Beijing 100039, China
Huanjiang Experimental Station of Karst Ecosystem, Chinese Academy of Science, Huanjiang 547100, China | | | CHEN Xiang-bi | The Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Huanjiang Experimental Station of Karst Ecosystem, Chinese Academy of Science, Huanjiang 547100, China | | | HE Xun-yang | The Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Huanjiang Experimental Station of Karst Ecosystem, Chinese Academy of Science, Huanjiang 547100, China | | | DONG Ming-zhe | The Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Graduate School of Chinese Academy of Sciences, Beijing 100039, China | | | QIU Hu-sen | The Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Graduate School of Chinese Academy of Sciences, Beijing 100039, China | | | HUANG Dao-you | The Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China | | | ZENG Xi-bai | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | SU Yi-rong | The Key Laboratory of Subtropical Agro-Ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
Huanjiang Experimental Station of Karst Ecosystem, Chinese Academy of Science, Huanjiang 547100, China | yrsu@isa.ac.cn |
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| Abstract: |
| Lignin is an important component in soil carbon cycle, and plays a particular role in the carbon storage. Lignin phenol content was calculated as the sum of vanillyl(V), syringyl(S), and cinnamyl(C) type phenols. To investigate the effect of long-term fertilization on lignin accumulation in agricultural soils, lignin content and its monomer composition were determined in upland and upland-paddy rotation fields under different fertilization practices[chemical fertilizer(NPK), combined straw and NP(S+NP)] in a subtropical red soil region. Soil pH, soil organic matter, and total nutrient content, and key enzymes were also determined. Results showed that both NPK and S+NP fertilization increased lignin content(VSC). The average accumulation rate of lignin in the upland was(17.67±0.87)μg·g-1·a-1 and (126.48±0.03)μg·g-1·a-1 for NPK and S+NP, respectively, while it was correspondingly(8.15±1.39)μg·g-1·a-1 and (119.85±3.10)μg·g-1·a-1 in upland-paddy rotation field. Long-term fertilization significantly increased the proportion of relative unstable cinnamyl(C) type monomer(P<0.05), with lower values in the rotation field than that in upland, suggesting that the composition of lignin monomers in the rotation field was more stable than in upland. Land use and fertilization significantly influenced soil nutrient, enzyme activity and lignin monomer content. Land use and fertilization interaction had significant effect on the content of V and C type monomers(P<0.01). Both correlation and RDA analysis showed that soil organic matter, nitrogen(total nitrogen and available nitrogen, P<0.05), and available potassium(P<0.01) were the key factors determining the lignin accumulation. Therefore, the influences of nitrogen and available potassium on lignin accumulation should be considered when studying the sequestration and turnover of organic carbon in red soil. |
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