根系输入对森林土壤碳库及碳循环的影响研究进展

doi:10.12302/j.issn.1000-2006.202002048

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南京林业大学学报（自然科学版） ›› 2022, Vol. 46 ›› Issue (1): 25-32.doi: 10.12302/j.issn.1000-2006.202002048

所属专题： "双碳”视域下的土壤碳

• 专题报道Ⅰ：“双碳”视域下的土壤碳（执行主编阮宏华） • 上一篇下一篇

根系输入对森林土壤碳库及碳循环的影响研究进展

黄梓敬¹(), 徐侠¹^,^*(), 张惠光², 蔡斌², 李良彬²

1.南京林业大学生物与环境学院,江苏南京 210037
2.武夷山国家公园科研监测中心,福建武夷山 354300

收稿日期:2020-02-28 接受日期:2020-09-22 出版日期:2022-01-30 发布日期:2022-02-09
通讯作者: 徐侠
基金资助:
国家自然科学基金青年科学基金项目(31700376);江苏省高等学校自然科学研究重大项目(17KJA180006);江苏省“六大人才高峰”计划(JY-041&TD-XYDXX-006);江苏高校优势学科建设工程资助项目(PAPD);南京林业大学“5151”人才计划项目(2018)

Advances in effects of root input on forest soil carbon pool and carbon cycle

HUANG Zijing¹(), XU Xia¹^,^*(), ZHANG Huiguang², CAI Bin², LI Liangbin²

1. College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China
2. Center for Scientific Research and Monitoring, Wuyishan National Park, Wuyishan 354300, China

Received:2020-02-28 Accepted:2020-09-22 Online:2022-01-30 Published:2022-02-09
Contact: XU Xia

摘要/Abstract

摘要：

植物根系输入是森林土壤碳库的重要来源。全球气候变化可能引起森林地下部分碳通量改变,进而影响森林土壤碳库及碳循环。笔者综述了根系输入对土壤碳累积、土壤活性碳库(包括土壤微生物生物量碳和可溶性有机碳)和土壤碳库稳定性的影响,综合分析了森林土壤呼吸、土壤微生物和土壤酶活性对根系输入变化的响应。分析发现:①根系输入减少可能减弱根际的激发效应,使土壤有机碳(SOC)短期增加,但从长期来看根系输入的缺失会导致SOC的减少;②根系分泌的一些物质促进土壤初始团聚体的形成,但其对矿物-有机质结合物稳定性的影响还不完全清楚;③根系输入减少会降低土壤呼吸作用;④微生物群落结构对根系输入变化的响应主要取决于微生物对底物质量和数量的适应,而这些响应在不同森林生态系统间可能也有差异;另外,酶合成主要取决于与微生物生长相关的资源分配到酶生产中的成本效率。目前,关于根系输入对碳循环,特别是土壤呼吸的研究比较多,但根系输入物组成复杂,微生物与酶对不同根系输入物的响应机制尚不清楚,这些响应在不同森林生态系统中也有差异;此外,根系输入对土壤碳库稳定性的作用常被忽视,根系与微生物的相互作用对碳循环和土壤碳库稳定性的影响还有很大不确定性。建议加强植物根系、土壤和微生物的相互关系研究,以深入理解气候变化背景下森林生态系统碳循环。

关键词: 森林生态系统, 根系输入, 土壤碳库, 碳循环

Abstract:

Plant root inputs are an essential source of forest soil carbon pools. Climate change may cause variations in the carbon flux below ground, affecting forest soil carbon pools and carbon cycles. In this article, we have reviewed the effects of root input on soil carbon accumulation, soil active carbon pools (including soil microbial biomass carbon and soluble organic carbon), and the stability of soil carbon pools. Furthermore, we have discussed the impacts of forest soil respiration, soil microorganisms, and soil enzyme activities on root inputs. We found that : (1) Decreased root input may reduce the priming effect of the rhizosphere and subsequently increase soil organic carbon in the short term but decrease it in the long term; (2) Root exudates may promote the initial formation of aggregates, but its effect on the stability of the metal-organic complex is unclear; (3) Decreased root input reduces soil respiration; (4) The response of the microbial community structure to root input mainly depends on the adaptation of microorganisms to substrate quality and quantity, which vary among forest ecosystems. In addition, whether enzyme synthesis is upregulated depends mainly on the cost efficiency of allocating resources for microbial growth to enzyme production. Many studies have investigated the carbon cycle of root input, especially soil respiration; however, the composition of root input is complex, and the response mechanisms of microorganisms and enzymes to different root inputs are unclear. These responses also differed among forest ecosystems. In addition, the effect of root input on the stability of the soil carbon pool is often neglected; the influence of the interaction between the root system and microorganisms on the carbon cycle and the stability of the soil carbon pool remains uncertain. We suggest strengthening the research on the links among plant roots, soil, and microorganisms, which would contribute to a deeper understanding of the carbon cycle of forest ecosystems in the context of climate change.

Key words: forest ecosystem, root input, soil carbon pool, carbon cycle

中图分类号:

S718.5

黄梓敬,徐侠,张惠光,等. 根系输入对森林土壤碳库及碳循环的影响研究进展[J]. 南京林业大学学报（自然科学版）, 2022, 46(1): 25-32.

HUANG Zijing, XU Xia, ZHANG Huiguang, CAI Bin, LI Liangbin. Advances in effects of root input on forest soil carbon pool and carbon cycle[J].Journal of Nanjing Forestry University (Natural Science Edition), 2022, 46(1): 25-32.DOI: 10.12302/j.issn.1000-2006.202002048.

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根系输入对森林土壤碳库及碳循环的影响研究进展

Advances in effects of root input on forest soil carbon pool and carbon cycle

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