Post-agricultural restoration: Implications for dynamics of soil organic matter pools
Post-agricultural restoration: Implications for dynamics of soil organic matter pools
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DOI：
10.1016/j.catena.2019.104096
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发表时间：
2019-10-01
期刊：
影响因子：
6.2
通讯作者：
Giani, Luise
中科院分区：
文献类型：
--
作者：
Kalinina, Olga;Cherkinsky, Alexander;Giani, Luise
为了弥补农业恢复过程中淋溶土有机质动态变化的差距，采用时序分析方法，研究了不同功能的淋溶土有机质库、碳14年龄和碳周转率的变化过程。该研究包括三个淋溶土年代序列的37年（北），120年（中），42年（南）在整个气候梯度的温带阔叶林欧洲俄罗斯。恢复导致活性（游离颗粒有机物（POM）和封闭的POM和被动（粘土部分）库中SOM的积累，从而增加总有机碳（C）。新的C的积累证实了增加δ C-14的签名的闭塞POM和粘土馏分。经过22年的恢复，三角洲C-14签名进展从负值到正值的封闭POM部分，而他们表现出类似的发展，但仍然是负面的粘土派系。这突出了这样一个事实，即新的C合并到被动池中发生，但与主动池相比，它发生的速度较慢。的C-14年龄的封闭POM部分下降，从600至1200年前（BP）在耕地网站约200年BP后22年的恢复和此后。土壤粘粒的C ~（14）年龄从1670 ~ 2660年BP下降到750 ~ 750年BP（22年废弃地）、450-310年BP（32-66年废弃地）和200-370年BP（近天然林）。C-14年龄的下降揭示了被动池内老年人和年轻人C之间的比例的变化所造成的管理和发展的生态系统走向稳定状态。恢复C是伴随着最初增加，然后减少周转率的SOM，都再次，更明显的活动池。这些动态跟踪初始生态系统扰动后放弃，随着时间的推移而减缓。虽然C恢复和调整周转率的SOM进展到一个新的稳定状态的生态系统，完全恢复没有实现在120年的时序时间尺度。
In order to bridge the gap of knowledge in respect of soil organic matter (SOM) dynamics of post-agricultural Luvisols during restoration, the study focused on alteration processes of functionally different SOM pools, C-14 ages, and C turnover rates in a chronosequential approach. The study comprises three Luvisol chronosequences of 37 years (North), 120 years (Middle), and 42 years (South) across a climate gradient of the temperate broad-leaved forests of European Russia. Restoration led to SOM accumulation within both active (free particulate organic matter (POM) and occluded POM and passive (clay fraction) pools, and as a result, in gains of total organic carbon (C). Accumulation of new C was confirmed by increasing Delta C-14 signatures of occluded POM and clay fractions. After 22 years of restoration, Delta C-14 signatures progressed from negative to positive values for the occluded POM fraction, whereas they showed a similar development but remained negative for the clay faction. This highlights the fact that the incorporation of new C into the passive pool takes place, but that it occurs at a slower rate compared to that of the active pool. The C-14 age of occluded POM fraction declined from 600 to 1200 years before present (BP) in arable sites to about 200 years BP after 22 years of restoration and thereafter. The C-14 age of the clay fraction decreased from 1670 to 2660 years BP in arable soils to 750 years BP in 22 year abandoned site, 450-310 years BP in 32-66 year abandoned sites, and 200-370 years BP in near-natural forests. This decline of the C-14 age reveals a change of the proportions between old and young C within the passive pool caused by management and the development of an ecosystem towards a steady state. Recovery of C was accompanied by initially increasing and then decreasing turnover rates of SOM, both again, much more pronounced in the active pool. These dynamics trace an initial ecosystem disturbance after abandonment, which slows down with time. Although C recovery and adjusted turnover rates of SOM progressed towards a new steady state of ecosystem; full restoration was not achieved within the chronosequential time scale of 120 years.