@article{Wang2026, 
author = {Haidi Wang and Bin Yan and Xingkang Ma and Yuhong Gao and Zhengjun Cui and Bing Wu and Yifan Wang and Jing Han and Mingli Wan},
title = {Crop rotation-induced soil aggregate restructuring enhances fertilizer nitrogen retention on the Loess Plateau of China},
year = {2026},
journal = {Journal of Integrative Agriculture (JIA)},
volume = {25},
number = {8},
pages = {3427-3439},
keywords = {15N-labeled fertilizer, long-term crop rotation, soil aggregates, aggregates function, nitrogen turnover},
url = {https://www.sciopen.com/article/10.1016/j.jia.2025.12.061},
doi = {10.1016/j.jia.2025.12.061},
abstract = {Soil aggregates highly regulate nitrogen (N) turnover, yet their functions in regulating N retention under long-term crop rotation remain unclear. This study used 15N-labeled fertilizer N to investigate how different-sized soil aggregates regulate fertilizer N retention and redistribution under long-term crop rotation systems. The results revealed that large macroaggregates exhibited a more pronounced depletion of fertilizer N (enrichment factor, Ef: 0.73−0.95) than of total N (Ef: 0.93−1.00). In contrast, macroaggregates and microaggregates enriched fertilizer N (Ef: 1.00−1.16). Crucially, we found a temporal divergence: after harvest (with new 15N-labeled fertilizer application), macroaggregates preferentially sequestered new N (current-season fertilizer N), whereas microaggregates dominated the stabilization of old N (previous-year fertilizer N) in the absence of 15N-labeled fertilizer in 2024. This functional specialization is driven by aggregate turnover, whereby disintegrating macroaggregates release old N for stabilization in microaggregates, while reforming macroaggregates encapsulate new N. The accelerated release of fertilizer N from these macroaggregates during crop cultivation supplies N to crops, while their reformation concurrently enriches new N. This process underscores the dual functions of macroaggregates in both supplying N to crops and enriching new N. Ultimately, crop rotations reinforce this beneficial dynamic by restructuring soil aggregation, leading to a marked expansion of the soil N pool, with fertilizer N storage increasing by 27.11−111.68% and total N storage by 2.94−14.22% compared to continuous cropping. Our findings establish the functional heterogeneity of soil aggregates as a key mechanism for long-term fertilizer N retention and stabilization. This provides a mechanistic basis for optimizing N management under crop rotations.}
}