Seasonal Soil Respiration Dynamics and Carbon-Stock Variations in Mountain Permanent Grasslands Compared to Arable Lands

Agriculture

Paride D’Ottavio¹  Marina Allegrezza¹  Laura Trozzo¹  Marco Toderi¹  Nora Baldoni¹  Matteo Francioni¹  Katarina Budimir¹  Giulio Tesei¹  Lucia Foresi²  AyakaWenhong Kishimoto-Mo³  Roberto Lai⁴ 

[1] Dipartimento di Scienze Agrarie, Alimentari ed Ambientali, Università Politecnica delle Marche, 60121 Ancona, Italy;East Malling Research, East Malling ME19, UK;Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization, 305-8604 Tsukuba, Japan;Nucleo di Ricerca Sulla Desertificazione (NRD), Università degli Studi di Sassari, 07100 Sassari, Italy;

关键词: ecosystem services;    C stock;    CO₂;    GHG;    land use change;    Q₁₀;   

DOI  :  10.3390/agriculture9080165

来源: DOAJ

【 摘 要 】

Permanent grasslands provide a wide array of ecosystem services. Despite this, few studies have investigated grassland carbon (C) dynamics, and especially those related to the effects of land-use changes. This study aimed to determine whether the land-use change from permanent grassland to arable lands resulted in variations in the soil C stock, and whether such variations were due to increased soil respiration or to management practices. To address this, seasonal variations of soil respiration, sensitivity of soil respiration to soil temperature (Q₁₀), and soil C stock variations generated by land-use changes were analyzed in a temperate mountain area of central Italy. The comparisons were performed for a permanent grassland and two adjacent fields, one cultivated with lentil and the other with emmer, during the 2015 crop year. Soil respiration and its heterotrophic component showed different spatial and temporal dynamics. Annual cumulative soil respiration rates were 6.05, 5.05 and 3.99 t C ha⁻¹ year⁻¹ for grassland, lentil and emmer, respectively. Both soil respiration and heterotrophic soil respiration were positively correlated with soil temperature at 10 cm depth. Derived Q₁₀ values were from 2.23 to 6.05 for soil respiration, and from 1.82 to 4.06 for heterotrophic respiration. Soil C stock at over 0.2 m in depth was 93.56, 48.74 and 46.80 t C ha⁻¹ for grassland, lentil and emmer, respectively. The land-use changes from permanent grassland to arable land lead to depletion in terms of the soil C stock due to water soil erosion. A more general evaluation appears necessary to determine the multiple effects of this land-use change at the landscape scale.

【 授权许可】

Unknown