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| Variation in sequestration of organic carbon associated with differently sized aggregates after organic manure application |
| Received:December 28, 2017 |
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| KeyWord:fertilizer;aggregate-associated organic carbon;farmland uses;soil texture;meta-analysis |
| Author Name | Affiliation | E-mail | | LU Tai-wei | College of Resource and Environment Science, Jilin Agricultural University, Changchun 130118, China
Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | CAI An-dong | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | XU Ming-gang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | mgxu@caas.ac.cn,xuminggang@caas.cn | | GAO Qiang | College of Resource and Environment Science, Jilin Agricultural University, Changchun 130118, China | | | SUN Nan | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | ZHANG Wen-ju | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | |
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| Abstract: |
| A data set on soil organic carbon (SOC) was set up based on 319 pairs of data collected using the same soil organic carbon fractionation method (the wet sieving method) and presented in 43 published papers. We conducted a meta-analysis to quantify the response of different fractions of organic carbon associated with >2, 2~0.25, 0.25~0.053, and <0.053 mm aggregates (Agg-OC) to manure (Org-M) or chemical fertilizer (Min-F) application compared to that without fertilizer (Non-F) application under different cropping system, farmland type, and soil texture conditions. Results showed that SOC in bulk soil and Agg-OC in the >2, 2~0.25, and 0.25~0.053 mm aggregates were significantly increased by both Org-M and Min-F compared to by Non-F. As for total SOC (TSOC), compared to Non-F, the improvement rate of Org-M over Non-F (38.0%) was 4.3 times higher than that of Min-F over Non-F (8.8%). As for the Agg-OC in different aggregates, the improvement rate of Org-M over Non-F (39.7%~72.3%) was 4.6~9.2 times higher (P<0.05) than that of Min-F over Non-F (4.3%~15.8%), respectively. There was no significant effect of Min-F on the <0.053 mm Agg-OC, whereas the effect of Org-M was significant. As for different size aggregates under the same conditions, compared with Non-F, the increase in applying Org-M on the 2~0.25 mm Agg-OC was significantly higher than those in the >2, 0.25~0.053, and <0.053 mm aggregates for double-cropping, upland, sandy, and clay conditions. In the same-sized particles under different conditions, compared to Non-F, Agg-OC was significantly increased by Org-M application. The orders of the increment were as follows:sandy > loam, clay, upland > paddy, paddy-upland for 2~0.25 mm; monocropping > double-cropping, upland > paddy, paddy-upland for both 0.25~0.053 and <0.053 mm. The effect of Min-F over Non-F on Agg-OC was similar to that of Org-M application, with no significant difference between them. Moreover, Min-F markedly decreased the <0.053 mm AggOC by 16.4% compared to Non-F in paddy. There was significant positive correlation between >0.25 and <0.25 mm Agg-OC and TSOC. An increase of 1.00 g·kg-1 in TSOC resulted in a 0.61 g·kg-1 increase in >0.25 mm Agg-OC, which was higher than that of <0.25 mm Agg-OC (0.23 g·kg-1). In conclusion, manure application benefits accumulation of soil aggregate-associated organic carbon, especially in >0.25 mm aggregates. Manure application is recommended for soil carbon sequestration in aggregates, especially for upland and light texture soil. |
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