Abstract

The succession of natural vegetation on the former arable soils triggers the processes of postagrogenic restoration of soil ecological functions specific of a particular bioclimatic zone. We analyze the postagrogenic dynamics of a set of soil characteristics in the upper (0–5 and 5–10 cm) layers of former arable horizon by the case study of the chronosequence of Retic Albic Podzols (agrosoddy podzols, southern taiga, Kostroma oblast, Russia) withdrawn from agricultural use 15, 20, and 45 years ago. The following soil characteristics are determined: pH_KCl; the contents of soil organic carbon (SOC), total nitrogen (TN), and dissolved carbon and nitrogen (DOC and DON); basal respiration (BR) rate; carbon of microbial biomass (C_mic); and relative indicators of the state of microbial community. In addition, absolute (HIX1) and relative (HIX2) humification indices of dissolved organic matter (DOM) are assessed for the soil layer of 0–5 cm in the studied soil chronosequence, as well as the stratification ratio (SR (0–5 : 5–10)). The following changes are observed in the upper layers of the former arable horizon over 45 years of postagrogenic succession: (1) a statistically significant decrease in the pH_KCl and humification index of DOM; (2) an increase in the SOC, TN, and C_mic contents and BR rate; and (3) a considerable stratification according to the SOC and TN contents and microbial properties. The highest values of SR for the SOC and TN are observed in the soil of the old-aged forest; for the microbial properties, in the 45-yr-old abandoned soil. Thus, the main characteristics and ecological functions of Retic Albic Podzol gradually restore during the secondary succession on the former arable land in the southern taiga zone.

中文翻译：

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后农业成因演化过程中南针叶林的网状白色足动物碳库和生物活性的动态

摘要

在以前的可耕种土壤上自然植被的演替触发了特定生物气候区特有的农耕后土壤生态功能的恢复过程。我们通过对Retic Albic Podzols（agrosoddy podzols，南部taiga，Kostroma oblast，俄罗斯）在15、20和45年前退出了农业用途。确定以下土壤特性：pH _KCl；土壤有机碳（SOC），总氮（TN）以及溶解碳和氮（DOC和DON）的含量；基础呼吸率 微生物生物量的碳（C_麦克风）; 以及微生物群落状态的相关指标。此外，在研究的土壤时间序列中，评估了0-5 cm土壤层中溶解有机物（DOM）的绝对（HIX1）和相对（HIX2）腐殖化指数，以及分层比率（SR（0-5 ：5-10））。在农耕后演替的45年中，在前耕种层的上层观察到以下变化：（1）pH _KCl和DOM的增湿指数在统计学上显着降低；（2）SOC，TN和C _mic的增加含量和BR率；（3）根据SOC和TN含量以及微生物特性，有相当大的分层。在老年森林土壤中，SOC和TN的SR最高。对于微生物特性，在45岁的废弃土壤中进行。因此，Retic Albic Podzol的主要特征和生态功能在次生演替过程中逐渐在南部针叶林带的耕地上恢复。