Z. S. Artemyeva, Yu. G. Kolyagin, E. S. Zasukhina, E. V. Tsomaeva, N. V. Yaroslavtseva, B. M. Kogut
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引用次数: 0
Abstract
The chemical structure of organic matter (OM) pools in the 2–1-mm water-stable macroaggregates isolated from air-dry aggregates of the same size in arable horizons of noneroded, eroded, and depositional agrochernozems was studied with solid-state 13C-NMR spectroscopy. The changes in their chemical structure in the denudation–accumulative landscape are assessed. The overwhelming majority of water-stable macroaggregates in the erosional zone are newly formed due to dynamic replacement of OM in situ, which is clearly demonstrated by the integral chemical structure indicators in all OM pools in macroaggregates. Analytical data suggest the prevalent transport of newly formed macroaggregates. The destruction of macroaggregates during the transport phase is accompanied by the release of previously physically protected aggregated OM, which undergoes partial mineralization. Note that its most labile (hydrolyzable) part is predominately mineralized, whereas its stable part remains weakly changed or intact. Mineral-associated OM (clay and residue) weakly changes or does not change at all, retaining relative freshness, which indirectly suggests the prevalent migration of newly formed macroaggregates from the erosional zone. A greater degree of freshness of LFfr (free OM) in macroaggregates of depositional agrochernozem results from the abundance of fresh crop residues of the depositional zone together with the residues transported from the erosional zone.
摘要 采用固态 13C-NMR 光谱法研究了从非侵蚀、侵蚀和沉积农业岩层中相同大小的气干聚集体中分离出来的 2-1 毫米水稳大聚集体中有机质（OM）池的化学结构。评估了它们的化学结构在剥蚀-累积景观中的变化。侵蚀带中绝大多数水稳定性大集聚物是由于原地 OM 的动态置换而新形成的，这一点在大集聚物中所有 OM 池的整体化学结构指标中得到了清楚的证明。分析数据表明，新形成的大集聚物普遍存在迁移现象。大团聚体在迁移阶段被破坏的同时，先前受到物理保护的团聚 OM 也被释放出来，进行部分矿化。需要注意的是，其最易变（可水解）的部分主要被矿化，而其稳定的部分则保持微弱的变化或完好无损。与矿物质相关的 OM（粘土和残渣）变化较弱或根本没有变化，保持了相对的新鲜度，这间接表明新形成的大聚合体普遍从侵蚀区迁移而来。沉积农业岩的大集合体中 LFfr（游离 OM）的新鲜度较高，这是因为沉积区有大量新鲜的农作物残留物以及从侵蚀区迁移过来的残留物。
期刊介绍：
Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences.
Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.
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