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颗粒态和矿物结合态有机质对草原土壤碳的贡献存在差异。

Divergent contribution of particulate and mineral-associated organic matter to soil carbon in grassland.

机构信息

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Ministry of Water Resources, CAS, Yangling, 712100, China; College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.

College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.

出版信息

J Environ Manage. 2023 Oct 15;344:118536. doi: 10.1016/j.jenvman.2023.118536. Epub 2023 Jun 29.

Abstract

Sequestration of soil organic carbon (SOC) is an effective means to draw atmospheric CO. Grassland restoration is one of the fastest methods to increase soil C stocks, and particulate-associated C and mineral-associated C play critical roles in soil C stocks during restoration. Herein, we developed a conceptual mechanistic frame regarding the contributions made by mineral-associated organic matter to soil C during the restoration of temperate grasslands. Compared to 1-year grassland restoration, 30-year restoration increased mineral-associated organic C (MAOC) by 41% and particulate organic C (POC) by 47%. The SOC changed from microbial MAOC predominance to plant-derived POC predominance, as the POC was more sensitive to grassland restoration. The POC increased with plant biomass (mainly litter and root biomass), while the increase in MAOC was mainly caused by the combined effects of increasing microbial necromass and leaching of the base cations (Ca-bound C). Plant biomass accounted for 75% of the increase in POC, whereas bacterial and fungal necromass contributed to 58% of the variance in MAOC. POC and MAOC contributed to 54% and 46% of the increase in SOC, respectively. Consequently, the accumulation of the fast (POC) and slow (MAOC) pools of organic matter are important for the sequestration of SOC during grassland restoration. Overall, simultaneous tracing of POC and MAOC helps further understand the mechanisms and predict soil C dynamics combined with the input of plant C, microbial properties, and availability of soil nutrients during grassland restoration.

摘要

土壤有机碳(SOC)的固定是吸收大气 CO 的有效手段。草原恢复是增加土壤 C 储量的最快方法之一,颗粒相关 C 和矿物相关 C 在恢复过程中对土壤 C 储量起着关键作用。本文构建了一个关于温带草原恢复过程中矿物相关有机质对土壤 C 贡献的概念性机制框架。与 1 年恢复的草地相比,30 年恢复增加了 41%的矿物相关有机碳(MAOC)和 47%的颗粒有机碳(POC)。SOC 从微生物 MAOC 为主转变为植物来源的 POC 为主,因为 POC 对草地恢复更为敏感。POC 随植物生物量(主要是凋落物和根系生物量)增加而增加,而 MAOC 的增加主要是由于微生物残体增加和基础阳离子(Ca 结合的 C)淋失的综合作用。植物生物量占 POC 增加的 75%,而细菌和真菌残体对 MAOC 变异的贡献率为 58%。POC 和 MAOC 分别对 SOC 增加的 54%和 46%有贡献。因此,快速(POC)和慢速(MAOC)有机质库的积累对草地恢复过程中 SOC 的固定非常重要。总的来说,同时追踪 POC 和 MAOC 有助于进一步了解机制,并结合草地恢复过程中植物 C、微生物特性和土壤养分的可利用性来预测土壤 C 动态。

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