Comparison of carbon sequestration efficiency in soil aggregates between upland and paddy soils in a red soil region of China
LIU Kai-lou1, 2, HUANG Jing1, LI Da-ming2, YU Xi-chu2, YE Hui-cai2, HU Hui-wen2, HU Zhi-hua2, HUANG Qing-hai2, ZHANG Hui-min1
1 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, P.R.China 2 Jiangxi Institute of Red Soil, National Engineering and Technology Research Center for Red Soil Improvement/Scientific Observational and Experimental Station of Arable Land Conservation in Jiangxi, Ministry of Agriculture, Nanchang 331717, P.R.China
There is limited information on carbon sequestration efficiency (CSE) of soil aggregates in upland and paddy soils under long-term fertilization regimes. In a red soil region of southern China, an upland soil experiment started in 1986 and a paddy soil experiment commenced in 1981. These experiments were conducted using different fertilization treatments. After 30 years, soil organic carbon (SOC) content and stock of different aggregate components were analyzed. The results showed that the SOC contents and stocks in upland soil were lower than in paddy soil. In both upland and paddy soils, the SOC contents and stocks of all aggregate components in NPKM (combined treatment with chemical nitrogen (N), phosphorus (P), potassium (K) fertilizers and manure) were the highest among all treatments. Compared with CK (no fertilizer), SOC content of all aggregate components in NPKM was increased by 13.21–63.11% and 19.13–73.33% in upland and paddy soils, respectively. Meanwhile, the change rates in SOC stock of all aggregate components in upland soil were lower than in paddy soil, although the change rate of SOC stock of all aggregate components in NPKM was higher than in other treatments. Furthermore, a linear equation could fit the relationships between carbon (C) input and change rate of SOC stock (P<0.05). Results indicated that the sum of CSE from all aggregate components in upland soil (16.02%) was higher than that of paddy soil (15.12%) in the same climatic condition and from the same parent material. However, the CSEs from all aggregates were higher than that of bulk soil, although the result from bulk soil also showed that the CSE of upland soil was higher than that of paddy soil.
Fund: This research was supported by the National Key Research and Development Program of China (2016YFD0200101 and 2016YFD0300901), the National Natural Science Foundation of China (41671301 and 41371293), and the Innovation Plan of Scientific and Research in Modern Agriculture, Jiangxi Province, China (JXXTCX2015003-005).
LIU Kai-lou, HUANG Jing, LI Da-ming, YU Xi-chu, YE Hui-cai, HU Hui-wen, HU Zhi-hua, HUANG Qing-hai, ZHANG Hui-min.
2019.
Comparison of carbon sequestration efficiency in soil aggregates between upland and paddy soils in a red soil region of China. Journal of Integrative Agriculture, 18(6): 1348-1359.
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