Climate, carbon content, and soil texture control the independent formation and persistence of particulate and mineral-associated organic matter in soil

有机质 土壤有机质 土壤水分 土壤质地 环境化学 土壤碳 化学 碎石 淤泥 孵化 腐殖质 颗粒有机物 分解 微粒 垃圾箱 环境科学 总有机碳 农学 土壤科学 生态学 生物 古生物学 生物化学 有机化学
作者
Michelle L. Haddix,E. G. Gregorich,Bobbi L. Helgason,H. H. Janzen,Benjamin H. Ellert,Maurizio Cotrufo
出处
期刊:Geoderma [Elsevier BV]
卷期号:363: 114160-114160 被引量:182
标识
DOI:10.1016/j.geoderma.2019.114160
摘要

Understanding the mechanisms controlling the formation and persistence of soil organic matter (SOM) is important for managing soil health and sustainable food production. The formation of SOM and the degree to which it is protected from decomposition are important for determining the long-term persistence of SOM. We used soils collected in a 13C-labelled litter decomposition study established at agricultural sites in Canada to understand the formation and persistence of newly-formed SOM. The ten agricultural sites spanned a wide range of soil carbon contents, texture, and climatic conditions. We fractionated the soil to isolate water extractable organic matter (WEOM), free light POM (fPOM), sand-sized and occluded particulate organic matter (oPOM), and silt and clay sized particles, referred to as mineral-associated organic matter (MAOM). Quantitative isotope tracing was used to determine the litter-derived C in all fractions. We performed these analyses early (six months after incubation) and later (five years after incubation) in the decomposition process to evaluate factors that control the formation and persistence of POM and MAOM. After six months litter-derived C was found in all fractions, but after five years it had declined in all fractions except the MAOM. Formation of MAOM was related to high mean annual precipitation and low sand content, whereas occluded POM formation was related to high soil C content. Persistence of MAOM and POM during the incubation were associated with low soil temperature and high soil C content. There was no consistent indication that formation of MAOM occurred from the decomposition of POM, suggesting that MAOM and POM are formed by two separate pathways. This has important implications for SOC models, which assume that plant-derived C passes through a sequence of pools, becoming more stable along the way.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
刚刚
CR7应助越啊采纳,获得20
1秒前
李健应助123采纳,获得10
2秒前
Jun完成签到,获得积分10
3秒前
大反应釜发布了新的文献求助10
3秒前
淳于安筠发布了新的文献求助30
6秒前
柳叶洋完成签到,获得积分10
6秒前
下一秒发布了新的文献求助10
9秒前
10秒前
11秒前
无花果应助科研通管家采纳,获得10
11秒前
Akim应助科研通管家采纳,获得10
11秒前
852应助科研通管家采纳,获得10
11秒前
SYLH应助科研通管家采纳,获得30
11秒前
斯文败类应助科研通管家采纳,获得10
11秒前
Owen应助科研通管家采纳,获得10
11秒前
orixero应助科研通管家采纳,获得10
11秒前
Orange应助科研通管家采纳,获得10
11秒前
情怀应助科研通管家采纳,获得30
11秒前
Jasper应助科研通管家采纳,获得10
12秒前
英俊的铭应助科研通管家采纳,获得10
12秒前
12秒前
Ava应助科研通管家采纳,获得10
12秒前
情怀应助科研通管家采纳,获得10
12秒前
12秒前
12秒前
12秒前
12秒前
SYLH应助shensiang采纳,获得20
13秒前
专一的从波完成签到 ,获得积分10
13秒前
领导范儿应助msjs采纳,获得30
13秒前
量子星尘发布了新的文献求助10
15秒前
安静的幼旋完成签到,获得积分10
16秒前
16秒前
白石溪发布了新的文献求助10
16秒前
16秒前
loski发布了新的文献求助10
16秒前
18秒前
勤恳化蛹完成签到,获得积分10
18秒前
黄健斌发布了新的文献求助10
19秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3989444
求助须知:如何正确求助?哪些是违规求助? 3531531
关于积分的说明 11254250
捐赠科研通 3270191
什么是DOI,文献DOI怎么找? 1804901
邀请新用户注册赠送积分活动 882105
科研通“疑难数据库(出版商)”最低求助积分说明 809174