Recovery of organic matter and microbial biomass after abandonment of degraded agricultural soils: the influence of climate
Recovery of organic matter and microbial biomass after abandonment of degraded agricultural soils: the influence of climate
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DOI：
10.1002/ldr.3387
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发表时间：
2019-07
影响因子：
4.7
通讯作者：
L. Ovsepyan;I. Kurganova;V. L. Gerenyu;Y. Kuzyakov
中科院分区：
文献类型：
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作者：
L. Ovsepyan;I. Kurganova;V. L. Gerenyu;Y. Kuzyakov
在农业用地被废弃后（目前全球有2.2亿公顷），退化的可耕地会自我恢复，并向自然生态系统发展。本文研究了农田恢复过程中土壤有机质（SOM）的微生物学特性和密度组分之间的关系。在两个对比鲜明的生物气候区的欧洲俄罗斯：落叶林（Luvic Phaeozem）和干草原（Calcic Phaeozem）的时序研究进行。每个时序包括耕地土壤，3-4土壤与废弃后增加的时期（从7年到35年），和参考网站与原生土壤。基础呼吸（BR）和微生物生物量（Cmic）与土壤有机碳（Corg）含量以及有机质密度组分（游离颗粒有机质（fPOM）、吸留颗粒有机质（oPOM）和矿物有机质）密切相关。大多数性质的最大增加常见于顶部0-5 cm，并且对于fPOM和oPOM级分（1.5-2.5倍）、Cmic（1.9倍）和BR（1.5-2.5倍）最大。第一次对土壤性质完全恢复的持续时间取决于气候进行了估计。一般来说，在森林和草原中，分别需要约40-120年和20-30年才能恢复农业用地废弃后0 - 5 cm土层中的Corg，总氮（TN）和Cmic含量。所有财产的最大恢复率通常在废弃后的头15-20年。
After abandonment of agricultural lands (ongoing on 220 million hectares worldwide), degraded arable soils undergo self‐restoration and development towards natural ecosystems. We studied the linkage between microbial properties and density fractions of soil organic matter (SOM) during post‐agricultural restoration of former arable Phaeozems and Chernozems. The chronosequence study was conducted in two contrasting bioclimatic zones of European Russia: deciduous forest (Luvic Phaeozem) and dry steppe (Calcic Chernozem). Each chronosequence included an arable soil, 3–4 soils with increasing periods after abandonment (from 7 to 35 years), and reference sites with native soils. The basal respiration (BR) and microbial biomass (Cmic) were closely correlated with the soil organic carbon (Corg) content as well as SOM density fractions: free particulate organic matter (fPOM), occluded particulate organic matter (oPOM), and mineral–SOM. The greatest increase in most properties was common in the top 0–5 cm and was maximal for fPOM and oPOM fractions (by 1.5–2.5‐times), Cmic (1.9‐times), and BR (1.5–2.5‐times). For the first time, the duration of full recovery of soil properties depending on climate were estimated. Generally, ~40–120 and 20–30 years in the forest and steppe, respectively, are required to restore Corg, total nitrogen (TN), and Cmic contents in the 0‐ to 5‐cm layer after the abandonment of agricultural lands. The maximal restoration rates of all properties are common in the first 15–20 years after abandonment.