Soil organic matter stability in forest and cropland components of two agroforestry systems in western Canada

被引：10

作者：

An, Zhengfeng ^{[1
,2
]}

Pokharel, Prem ^{[2
]}

Plante, Alain F. ^{[3
]}

Bork, Edward W. ^{[4
]}

Carlyle, Cameron N. ^{[4
]}

Williams, Elizabeth K. ^{[3
]}

Chang, Scott X. ^{[2
]}

机构：

[1] Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China

[2] Univ Alberta, Dept Renewable Resources, 442 Earth Sci Bldg, Edmonton, AB T6G 2E3, Canada

[3] Univ Penn, Dept Earth & Environm Sci, Hayden Hall,240 South 33rd St, Philadelphia, PA 19104 USA

[4] Univ Alberta, Dept Agr Food & Nutr Sci, 410 Agr Forestry Ctr, Edmonton, AB T6G 2H1, Canada

来源：

GEODERMA | 2023年 / 433卷

关键词：

Agroforestry system; Carbon sequestration; Land; -use; SOC thermal stability; Biological stability; Thermal analysis; TREE SPECIES MIXTURE; CARBON SEQUESTRATION; FUMIGATION-EXTRACTION; CLIMATE-CHANGE; STOCKS; TEMPERATE; EMISSION; DYNAMICS; IMPACTS; SUBSOIL;

D O I：

10.1016/j.geoderma.2023.116463

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Agroforestry systems play important roles in carbon (C) sequestration in western Canada. However, the effect of agroforestry system type and their component land-uses (forested area and cropland) on soil organic C (SOC) stability is poorly understood. We studied SOC stability in surface soils from two agroforestry systems (shelterbelt system and hedgerow system) and their component land-uses (forested area and cropland) in western Canada. A 61-day laboratory incubation was used to assess SOC biological stability, and compared to thermal stability measured during ramped combustion. The shelterbelt system had a lower biological stability than the hedgerow system as indicated by the higher cumulative soil respiration and SOC loss during incubation. Cumulative respiration and SOC loss during incubation in the forested area was 1.63 and 1.57 times that in the cropland, indicating a lower SOC biological stability in the former. Thermal stability indicators, CO2-T50 (the temperature at which half of the CO2 is produced), DSC-T50 (the temperature at which half of the exothermic energy of the SOC is released) and ROI (return on energy investment) were influenced by the interactive effects of the agroforestry system by land-use, while TG-T50 (the temperature at which half of the exothermic mass is lost) and Ed (energy density) were influenced by land-use and the interactive effects of agroforestry system by land-use. Hedgerow cropland had a higher SOC thermal stability (higher TG-T50) than the hedgerow forested area, while there was no difference among shelterbelt cropland, and the forested areas of shelterbelt and hedgerow system. We conclude that planting trees on agricultural land to form agroforestry systems alters SOC biological and thermal stabilities, and the hedgerow system may have a more stable SOC than the shelterbelt system, thus, maintaining the hedgerow system may enhance C stability, promote C sequestration and climate change mitigation.

引用

页数：11

共 70 条

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