Soil organic carbon active fractions as early indicators for total carbon change under straw incorporation |
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| Authors: | Minggang Xu Yilai Lou Xiaolin Sun Wei Wang Muhammad Baniyamuddin Kai Zhao |
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| Institution: | (1) Ministry of Agriculture Key Laboratory of Crop Nutrition and Fertilization, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China;(2) Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China;(3) Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824, USA;(4) Department of Zoology, Aligarh Muslim University, Aligarh, 202002, India;(5) Chaoyang Center for Agricultural Technology Service, Chaoyang, 100049, China |
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| Abstract: | Changes in total organic C (C
T), water-soluble organic C (C
WS), microbial biomass C (C
MB), C mineralization, particulate organic C (C
P), labile organic C (C
L), C management index (CMI), and C storage in surface Hapli-Ustic Cambisol (0–20 cm) under straw incorporation after both
2- and 10-year durations were investigated in a maize (Zea mays L.) field experiment in northeast China, in order to examine the effectiveness of these active C fractions and CMI as early
indicators for total C change. The treatments included straw removal (0%S), 50% of straw incorporation (50%S), and 100% of
straw incorporation (100%S). Under the straw incorporation, C
T concentration and C storage did not significantly change under 2-year duration, while were significantly increased under
10-year duration. However, C
MB, total C mineralization (C
TM), C
P, and C
L, and CMI were significantly increased under the straw incorporation even after only 2-year duration, and the responses were
more significant after 10-year duration. There were positive correlations between all these C indicators with each other.
Our findings demonstrate that the measured active C fractions (except for C
WS) and CMI can provide an early indication of change in total soil organic C induced by straw incorporation. |
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| Keywords: | |
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