Abstract

A combined analysis of the current climate trends and the dynamics of soil respiration under soddy–weakly podzolic sandy-loamy soil (Entic Podzol (Arenic)) in the forest and meadow cenoses in the Prioksko-Terrasny Biosphere Reserve (southern part of the Moscow oblast) is performed. During the observation period (1998–2018), distinct trends of an increase in the average annual air temperature (T_air) and aridity of the summer season as well as a decrease in the duration of stable snow cover are observed. A general trend of a decrease in the total CO₂ fluxes from the Entic Podzol (Arenic) under a forest and a meadow for all seasons of the year and throughout the year is also observable on this background. The linear trends of a decrease in the annual and fall seasonal CO₂ fluxes from the soils in both cenoses are statistically significant (P < 0.05). Over the 21-year observation period, the monthly average CO₂ fluxes from soils have tightly correlated with the average monthly T_air (r = 0.78–0.84, P < 0.001). In dry years, the temperature sensitivity of soils expressed via the Q₁₀ coefficient is by 10–12% lower, than in the years with normal moistening. The average long-term values of annual soil respiration (AnSR) in the forest and meadow cenoses amount to 581 ± 54 and 727 ± 71 g C/(m² year), respectively, with an interannual variation of 20–22%. The AnSR and summer hydrothermal coefficient are the most closely related explaining 51–56% of the variance in annual CO₂ fluxes from soils. The warm season (May–October), which coincides with the period of active plant vegetation, accounts for 73–77% of the AnSR. However, the share of the cold season (November–April) in the annual CO₂ flux from soils may reach 38–39% in individual years. Expansion of the network of stationary long-term year-round monitoring of soil respiration is a necessary condition for obtaining both more realistic estimates of the CO₂ fluxes from soils and predictions of the ecosystem responses to the current and future climate changes.

中文翻译：

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从当前气候趋势角度分析普里克斯科-特拉斯尼生物圈保护区森林和草甸物种的长期土壤呼吸动力学

摘要

Prioksko-Terrasny生物圈保护区（莫斯科州南部的部分地区）的森林和草地人口调查中，当前气候趋势和土壤-土壤微弱的豆荚状沙质壤土（Entic Podzol（Arenic））下土壤呼吸动力学的综合分析）。在观测期内（1998-2018年），观测到了明显的趋势，即平均年气温（T _air）和夏季干旱的增加以及稳定积雪持续时间的减少。在这种背景下，一年四季和全年，森林和草地下的Entic Podzol（Arenic）的总CO ₂通量减少的总体趋势也是可以观察到的。年度和秋季CO减少的线性趋势两种普查的土壤通量有_2个具有统计学意义（P < 0.05）。在21年的观测期内，土壤每月的平均CO ₂通量与月平均T_空气紧密相关（r = 0.78–0.84，P < 0.001）。在干旱年份，通过Q ₁₀系数表示的土壤温度敏感性比正常增湿年份低10–12％。森林和草地普查中土壤年呼吸（AnSR）的平均长期值分别为581±54和727±71 g C /（m ²年），每年的变化幅度为20-22％。AnSR和夏季水热系数之间的关系最为密切，可以解释土壤中年度CO ₂通量变化的51–56％。与植物活跃期相吻合的暖季（5-10月）占AnSR的73-77％。但是，在各个年份，每年从土壤中释放的CO ₂通量中，寒冷季节（11月至4月）的份额可能达到38％至39％。扩展对土壤呼吸的全年长期固定监测网络的必要条件，这是获得更现实的土壤CO ₂流量估算值和预测生态系统对当前和未来气候变化响应的必要条件。