不同密度油松林地土壤水碳分布特征及其耦合关系

doi:10.13287/j.1001-9332.202501.007

应用生态学报 ›› 2025, Vol. 36 ›› Issue (1): 50-58.doi: 10.13287/j.1001-9332.202501.007

不同密度油松林地土壤水碳分布特征及其耦合关系

郭艳杰¹, 毕华兴^1,2,3,4*, 赵丹阳¹, 刘泽晖¹, 林丹丹¹, 韩金丹¹, 黄浩博¹

¹北京林业大学, 北京 100083;
²林木资源高效生产全国重点实验室, 北京 100083;
³山西吉县森林生态系统国家野外科学观测研究站, 山西临汾 041000;
⁴水土保持国家林业和草原局重点实验室/北京市水土保持工程技术研究中心/林业生态工程教育部工程研究中心(北京林业大学), 北京 100083

收稿日期:2024-08-19 修回日期:2024-11-12 出版日期:2025-01-18 发布日期:2025-07-18
通讯作者: *E-mail: bhx@bjfu.edu.cn
作者简介:郭艳杰, 女, 1999年生, 硕士研究生。主要从事林业生态工程研究。E-mail: 2138858384@qq.com
基金资助:
国家重点研发计划项目(2022YFF1300401)

Soil water and carbon distribution characteristics and their coupling relationship in Pinus tabuliformis plantations with different densities

GUO Yanjie¹, BI Huaxing^1,2,3,4*, ZHAO Danyang¹, LIU Zehui¹, LIN Dandan¹, HAN Jindan¹, HUANG Haobo¹

¹Beijing Forestry University, Beijing 100083, China;
²National Key Laboratory of High-Efficiency Production of Forest Resources, Beijing 100083, China;
³Jixian Forest Ecosystem National Field Scientific Observation and Research Station, Linfen 041000, Shanxi, China;
⁴Key Laboratory of Soil and Water Conservation, National Forestry and Grassland Administration/Beijing Engineering Research Center of Soil and Water Conservation/Engineering Research Center of Forestry and Ecological Engineering, Ministry of Education (Beijing Forestry University), Beijing 100083, China

Received:2024-08-19 Revised:2024-11-12 Online:2025-01-18 Published:2025-07-18

摘要/Abstract

摘要： 本研究以晋西黄土区1000、1800、2700、3600和4500株·hm^-25个林分密度的油松人工林为对象,测定0～5 m土层土壤总碳、有机碳、无机碳和土壤水分含量,分析不同土壤层次土壤水、碳对林分密度的响应,并利用改进的耦合协调度模型,量化水碳权衡/协同强度对林分密度的响应。结果表明: 土壤有机碳含量呈现表聚性(0～20 cm),之后随着土壤深度而逐渐减少;土壤无机碳随土壤深度呈先增加后减少趋势,但整体变化不显著。随林分密度的增大,土壤有机碳含量逐渐增加,而土壤无机碳呈先增后减趋势,密度拐点为2549株·hm^-2。土壤水分随林分密度呈现先减少后增加的趋势,密度拐点为3268株·hm^-2。土壤总碳与水分以及有机碳与水分的耦合协调度均随林分密度增加而先降低后升高,在1000～1800株·hm^-2密度区间处于协同发展水平,在1800～3600株·hm^-2区间处于过渡调和水平,在3600～4500株·hm^-2处于协同发展水平,即呈“协同-权衡-协同”的变化。土壤无机碳与土壤水分的耦合协调度随林分密度增加而降低,在1000～2700株·hm^-2密度区间处于协同发展水平,在2700～4500株·hm^-2区间处于过渡调和水平,即呈“协同-权衡”的变化。油松林林分密度小于1800株·hm^-2时,可减少林木耗水量并增加碳汇,实现土壤固碳与水源涵养的协同发展。

关键词: 林分密度, 水碳耦合, 权衡与协同, 晋西黄土区

Abstract: We measured total carbon content, organic carbon content, inorganic carbon content and water content of 0-5 m soil layers in five Pinus tabuliformis stands with densities of 1000, 1800, 2700, 3600 and 4500 plants·hm^-2 in the loess region of western Shanxi Province, to understand the responses of soil water and carbon at different soil layers to stand density. We used an improved coupling coordination degree model to quantify the intensity of the water-carbon trade-off/synergistic response to stand density. The results showed that soil organic carbon content exhibited surface aggregation (0-20 cm), and gradually decreased as soil depth increased. Soil inorganic carbon content initially increased and then decreased with soil depth, but there were no significant differences among soil depths. As stand density increased, soil organic carbon content increased gradually, while soil inorganic carbon increased initially but then decreased, and the density threshold was 2549 plants·hm^-2. Soil water content decreased initially and then increased with stand density, reaching a density threshold of 3268 plants·hm^-2. As stand density increased, the coupling coordinations of soil total carbon with water, and organic carbon with water, decreased initially and then increased. They showed synergistic developments among 1000-1800 plants·hm^-2, whereas transition harmonies among 1800-3600 plants·hm^-2, and then synergistic developments among 3600-4500 plants·hm^-2. That was a pattern of “synergy-trade-offs-synergy”. The coupling coordination of soil inorganic carbon and soil water decreased with the increase in stand density. There were synergistic developments among 1000-2700 plants·hm^-2, and transition harmonies among 2700-4500 plants·hm^-2, with a pattern of “synergy-trade-offs”. These results suggested that when the stand density of P. tabuliformis plantation was less than 1800 plants·hm^-2, it could reduce water consumption of forest and increase carbon sink, realizing the synergistic development of soil carbon sequestration and water conservation.

Key words: stand density, water-carbon coupling, trade-off and synergy, the loess region in western Shanxi

郭艳杰, 毕华兴, 赵丹阳, 刘泽晖, 林丹丹, 韩金丹, 黄浩博. 不同密度油松林地土壤水碳分布特征及其耦合关系[J]. 应用生态学报, 2025, 36(1): 50-58.

GUO Yanjie, BI Huaxing, ZHAO Danyang, LIU Zehui, LIN Dandan, HAN Jindan, HUANG Haobo. Soil water and carbon distribution characteristics and their coupling relationship in Pinus tabuliformis plantations with different densities[J]. Chinese Journal of Applied Ecology, 2025, 36(1): 50-58.

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不同密度油松林地土壤水碳分布特征及其耦合关系

Soil water and carbon distribution characteristics and their coupling relationship in Pinus tabuliformis plantations with different densities

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