Collaborative Research: MSB-ECA: Resolving controls on lignin decomposition at the continental scale to reconcile classical and modern paradigms of soil organic matter

合作研究：MSB-ECA：解决大陆尺度木质素分解的控制问题，以协调土壤有机质的经典和现代范式

基本信息

批准号：
1802728
负责人：
Samantha Weintraub-Leff
金额：
$ 5.6万
依托单位：
Battelle Memorial Institute
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2022-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1802728&HistoricalAwards=false
关键词：
Collaborative Research MSB ECA Resolving

项目摘要

Lignin is an important component of plant tissues that provides protection from herbivores and pathogens due to its complex chemical structure. When plant tissues die and enter the soil, lignin is often among the last components to decompose and may persist for decades or even longer. Despite the generally slow decay rates of lignin, recent work has suggested that many soils contain very little lignin in their organic matter. This apparent contradiction presents a key challenge for our understanding of soil organic matter formation, a topic which is critically linked to environmental services including soil fertility, water quality, and carbon storage. This research seeks to understand the environmental factors that control lignin decay rates and the ultimate contributions of lignin to soil organic matter in ecosystems across North America. The influence of differences in soil microorganisms and minerals on lignin decomposition across diverse ecosystems will be assessed. The broader implications of the findings for ecosystem functions and services will be studied by using a mathematical model. A postdoctoral researcher and graduate students will be trained, and findings will be communicated to the public and to land managers with targeted outreach activities.This research seeks to resolve lingering inconsistencies in soil organic matter, where the context-specific importance of lignin may have been neglected due to spatial and methodological sampling biases. Interactions among lignin, soil geochemical characteristics, and microbial community composition may have significant impacts on lignin residence times and mineral sorption that emerge only when examined across continental-scale environmental gradients. Data collected from National Ecological Observatory Network (NEON) sites will be combined with new experiments to test two hypotheses: (1) Does lignin decomposition rates and its abundance in soil organic matter predictably vary with soil geochemical characteristics and microbial community composition at the continental scale (in contrast to both classical and modern paradigms of soil organic matter)?; and (2) Can the representations of lignin decomposition and carbon cycling in a state-of-the-art mechanistic ecosystem model be improved by inclusion of geochemical and microbial parameters (in addition to the traditional variables of climate, residue quality, and nutrient availability)? The NEON data will be combined with field and laboratory incubations of carbon isotope-labeled lignins and nuclear magnetic resonance spectroscopic measurements to test these hypotheses.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

木质素是植物组织的重要组成部分，由于其复杂的化学结构，可保护食草动物和病原体。当植物组织死亡并进入土壤时，木质素通常是分解的最后一个成分之一，可能会持续数十年甚至更长。尽管木质素的衰变速度通常通常很缓慢，但最近的工作表明，许多土壤在其有机物中几乎没有木质素。这一明显的矛盾给了我们对土壤有机物形成的理解的关键挑战，这一主题与环境服务密切相关，包括土壤肥力，水质和碳储存。这项研究试图了解控制木质素衰减率的环境因素，以及木质素对北美生态系统土壤有机物的最终贡献。将评估土壤微生物和矿物质对木质素分解跨不同生态系统的差异的影响。这些发现对生态系统功能和服务的更广泛含义将通过使用数学模型来研究。博士后研究人员和研究生将接受培训，并将发现发现与有针对性的外展活动的土地经理传达。这项研究试图解决土壤有机物的缠绵不一致，在土壤有机物中，木质素的上下文特异性重要性可能由于空间和方法论采样偏见而被忽略了。木质素，土壤地球化学特征和微生物群落组成之间的相互作用可能会对木质素停留时间和矿物质吸附产生重大影响，而在跨大陆尺度环境梯度进行检查时，才会出现。从国家生态观测网络（NEON）站点收集的数据将与新实验相结合，以检验两个假设：（1）木质素分解速率及其在土壤有机物中的丰度是否会随着土壤地球化学特征和大陆尺度上的微生物群落组成而变化（与土壤有机物的经典和现代范式相反）？（2）可以通过包含地球化学和微生物参数（除了气候，残留质量和养分可用性的传统变量之外，还可以改善木质素分解和碳循环的表示吗？霓虹灯数据将与碳同位素标记的木质素和核磁共振光谱测量的现场和实验室孵育相结合，以检验这些假设。该奖项反映了NSF的法定任务，并认为通过基金会的知识分子和更广泛的影响，可以通过评估来审查Criteria，通过评估来进行评估。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Climatic and Geochemical Controls on Soil Carbon at the Continental Scale: Interactions and Thresholds

DOI：
10.1029/2020gb006781
发表时间：
2021-03
期刊：
Global Biogeochemical Cycles
影响因子：
5.2
作者：
Wenjuan Yu;S. Weintraub;S. Hall
通讯作者：
Wenjuan Yu;S. Weintraub;S. Hall

Where and why do particulate organic matter (POM) and mineral-associated organic matter (MAOM) differ among diverse soils?

不同土壤中颗粒有机质 (POM) 和矿物质相关有机质 (MAOM) 在何处以及为何存在差异？

DOI：
10.1016/j.soilbio.2022.108756
发表时间：
2022
期刊：
Soil Biology and Biochemistry
影响因子：
9.7
作者：
Yu, Wenjuan;Huang, Wenjuan;Weintraub-Leff, Samantha R.;Hall, Steven J.
通讯作者：
Hall, Steven J.

Biogeochemical and 13C NMR data from NEON surface mineral soils

NEON 表面矿质土壤的生物地球化学和 13C NMR 数据

DOI：
10.6073/pasta/2284825ecb8460f056ae5b0e7d355cc8
发表时间：
2020
期刊：
Environmental Data Initiative
影响因子：
0
作者：
Hall, Steven J;Ye, Chenglong;Weintraub, Samantha R;Hockaday, William C
通讯作者：
Hockaday, William C

Lignin, litter, and soil carbon decomposition from soil samples collected from 20 National Ecological Observatory Network (NEON) sites in 2019

2019 年从 20 个国家生态观测站网络 (NEON) 站点收集的土壤样品中的木质素、凋落物和土壤碳分解

DOI：
10.6073/pasta/4d3e5a6df9c1fc4cea8d0be55a385182
发表时间：
2022
期刊：
Environmental Data Initiative
影响因子：
0
作者：
Huang, Wenjuan;Yu, Wenjuan;Yi, Bo;Raman, Erik;Yang, Jihoon;Hammel, Kenneth E;Lu, Chaoqun;Howe, Adina Chuang;Weintraub-Leff, Samantha R;Hall, Steven J
通讯作者：
Hall, Steven J