Effects of 22-year fertilisation on the soil organic C, N, and theirs fractions under a rice-wheat cropping system

被引:9
|
作者
Zhao, Yanan [1 ,2 ]
Zhang, Yuting [2 ,3 ]
Zhang, Yueqiang [2 ,4 ]
Xie, Jun [2 ,5 ]
Chen, Xinping [2 ,3 ,4 ]
Shi, Xiaojun [2 ,3 ]
机构
[1] Henan Agr Univ, Coll Resources & Environm, Zhengzhou, Peoples R China
[2] Southwest Univ, Coll Resources & Environm, 2 Tiansheng Rd, Chongqing 400715, Peoples R China
[3] Key Lab Efficient Utilizat Soil & Fertilizer Reso, Chongqing, Peoples R China
[4] Southwest Univ, State Cultivat Base Ecoagr Southwest Mt Land, Chongqing, Peoples R China
[5] Southwest Univ, Acad Agr Sci, Chongqing, Peoples R China
关键词
Soil organic carbon; SOC fractions; long-term fertilisation; straw; paddy soil; CARBON SEQUESTRATION; RESIDUE MANAGEMENT; MATTER; STABILIZATION; POOLS; PRODUCTIVITY; RELEVANCE; BINDING; LAND;
D O I
10.1080/03650340.2020.1757659
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
The quantification of soil organic carbon (SOC) and N fractions under the influence of long-term fertilisation is useful to understand soil organic matter (SOM) stabilization mechanism and to develop optimal management practices. This study was to investigate the responses of different SOC and N fractions to long-term fertilisation and their contributions to the total change in the bulk soil under a rice-wheat cropping system. Compared with soil with no fertilisation, the 22-year fertilisation improved the C and N content of the bulk soil and different fractions with the greatest increase in NPK fertilisers and rice straw treatment. The SOC and N changes of heavy fraction accounted for 92% and 88% of the total SOC increases, while the Fe/Al-bound organic carbon and humic organic carbon in heavy fraction accounted for 43% and 48%, respectively. The SOC and N contents of each fraction were positively correlated with the bulk soil and the others. It is concluded that the NPK fertilisers plus straw returning was efficient to enhance SOC and N accumulation; the chemical binding of Fe and Al in organic-mineral complexes and the further formation of recalcitrant humin might be the potential mechanism for SOM accumulation in the rice-wheat cropping system.
引用
收藏
页码:767 / 777
页数:11
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