Soil CO2 fluxes and carbon storage in livestock systems with native trees in pastures in the subhumid tropics of Mexico

IF 2.2 3区 农林科学 Q2 AGRONOMY
Fernando Casanova-Lugo, Dixan Pozo-Leyva, Armando Escobedo-Cabrera, Héctor Estrada-Medina, Luis A. Lara-Pérez, Ricardo L. D. Costa, Adibe L. Abdalla, Gilberto Villanueva-López, Deb R. Aryal
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Abstract

The integration of trees in degraded livestock grazing lands can enhance soil carbon sequestration through increased organic matter input, their turnover, and stabilized soil carbon dioxide (CO2) fluxes. This study aimed to evaluate and compare the dynamics of soil CO2 fluxes, environmental parameters, and soil organic carbon (SOC) storage in silvopastoral systems with native trees (STP) and conventional pasture monoculture (PM). We measured the soil CO2 fluxes in STP and PM twice a month from March to September 2022, representing the dry and rainy seasons. Measurements were made in situ in the morning, afternoon, and night in both livestock systems using an infrared gas analyzer (EGM-5®, PP Systems, USA). Ambient temperature, soil temperature (°C), and soil moisture (%) were simultaneously monitored. Overall, STP showed higher soil CO2 fluxes than PM, which were more pronounced in the dry season. The soil moisture was higher in STP than in PM during the dry season, explaining the increase in CO2 fluxes during that period. The diurnal variations of soil CO2 fluxes showed the highest values in the mornings with averages of 8.7 and 7.9 µmole m−2 s−1, respectively, in STP and PM. Soil CO2 fluxes correlated positively with soil moisture and were higher in the rainy season in both systems. STP stored 76.79 Mg ha−1 of SOC at 0–30 cm depth compared to 51.07 Mg ha−1 in PM. Higher CO2 flux and greater SOC storage make silvopasture more dynamic than pasture monoculture for carbon cycling, but further research on carbon input, its mineralization kinetics, and the relationship with microbial activity would better explain the higher soil CO2 fluxes in STP than in PM.

墨西哥半湿润热带地区牧场原生树木牲畜系统的土壤CO2通量和碳储量
在退化的牲畜放牧地种植树木可以通过增加有机质输入、增加有机质周转和稳定土壤二氧化碳通量来增强土壤碳固存。摘要本研究旨在评价和比较天然树木(STP)和传统草地单一栽培(PM)下森林生态系统土壤CO2通量、环境参数和土壤有机碳(SOC)储量的动态变化。在2022年3月至9月期间,我们每月两次测量STP和PM的土壤CO2通量,分别代表旱季和雨季。使用红外气体分析仪(EGM-5®,PP systems, USA)在两个牲畜系统中分别于上午、下午和晚上进行现场测量。同时监测环境温度、土壤温度(℃)和土壤湿度(%)。总体而言,STP土壤CO2通量高于PM,且在旱季更为明显。在干旱季节,STP土壤湿度高于PM,这解释了在此期间CO2通量的增加。土壤CO2通量的日变化以清晨最高,STP和PM的平均值分别为8.7和7.9 μ mol m−2 s−1。土壤CO2通量与土壤湿度呈正相关,且在雨季均较高。STP在0-30 cm深度储存了76.79 Mg ha−1的有机碳,而在PM中储存了51.07 Mg ha−1。更高的CO2通量和更大的有机碳储量使得森林草地的碳循环比单一牧场更具动态性,但进一步研究碳输入、其矿化动力学以及与微生物活动的关系将更好地解释STP比PM更高的土壤CO2通量。
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来源期刊
Agroforestry Systems
Agroforestry Systems 农林科学-林学
CiteScore
5.30
自引率
9.10%
发文量
78
审稿时长
4.5 months
期刊介绍: Agroforestry Systems is an international scientific journal that publishes results of novel, high impact original research, critical reviews and short communications on any aspect of agroforestry. The journal particularly encourages contributions that demonstrate the role of agroforestry in providing commodity as well non-commodity benefits such as ecosystem services. Papers dealing with both biophysical and socioeconomic aspects are welcome. These include results of investigations of a fundamental or applied nature dealing with integrated systems involving trees and crops and/or livestock. Manuscripts that are purely descriptive in nature or confirmatory in nature of well-established findings, and with limited international scope are discouraged. To be acceptable for publication, the information presented must be relevant to a context wider than the specific location where the study was undertaken, and provide new insight or make a significant contribution to the agroforestry knowledge base
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