宁南山区不同恢复年限柠条林土壤养分及有机碳组分变化特征

doi:10.13287/j.1001-9332.202403.018

应用生态学报 ›› 2024, Vol. 35 ›› Issue (3): 639-647.doi: 10.13287/j.1001-9332.202403.018

宁南山区不同恢复年限柠条林土壤养分及有机碳组分变化特征

张羽涵¹, 李瑶¹, 周玥², 陈圆佳¹, 安韶山^1,3*

¹西北农林科技大学水土保持科学与工程学院, 陕西杨凌 712100;
²西北农林科技大学资源与环境学院, 陕西杨凌 712100;
³西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100

收稿日期:2023-09-20 修回日期:2024-01-30 出版日期:2024-03-18 发布日期:2024-06-18
通讯作者: *E-mail: shan@ms.iswc.ac.an
作者简介:张羽涵, 女, 1998年生, 硕士研究生。主要从事黄土丘陵区植被恢复过程中土壤碳循环研究。E-mail: 17390928513@163.com
基金资助:
国家自然科学基金面上项目(42077072)、国家自然科学基金青年项目(42307440)、陕西省博士后基金项目(2023BSHTBZZ27)和国家资助博士后研究人员计划项目(GZC20232153)

Changes of soil nutrients and organic carbon fractions in Caragana korshinskii forests with different restoration years in mountainous areas of southern Ningxia, China

ZHANG Yuhan¹, LI Yao¹, ZHOU Yue², CHEN Yuanjia¹, AN Shaoshan^1,3*

¹College of Soil and Water Conservation Science and Engineering, Northwest A&F University, Yangling 712100, Shaanxi, China;
²College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China;
³State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling 712100, Shaanxi, China

Received:2023-09-20 Revised:2024-01-30 Online:2024-03-18 Published:2024-06-18

摘要/Abstract

摘要： 植被恢复能有效改善土壤质量,促进土壤有机碳(SOC)的固存。本研究以宁南山区0～100 cm土层不同恢复年限(16、28、38年)柠条林为研究对象,以农田和天然草地作为对照,分析了土壤养分及有机碳组分沿剖面分布特征及其对恢复年限的响应。结果表明: 1)SOC、土壤全氮(TN)、全磷(TP)、颗粒态有机碳(POC)和矿物结合态有机碳(MAOC)含量以及颗粒态有机碳占总有机碳的比例(POC/SOC)均随土层深度增加而降低,而矿物结合态有机碳占总有机碳的比例(MAOC/SOC)呈相反趋势; 2)随着柠条恢复年限的增加,SOC、TN、TP、C∶P、N∶P、POC和MAOC含量逐渐降低,C∶N无显著变化,POC/SOC先增后减,MAOC/SOC先减后增;3)在3种土地类型中,POC、MAOC与SOC之间均呈极显著正线性相关关系,且SOC的增加主要依赖于MAOC的增加。天然草地和柠条林地土壤SOC、TN、TP、POC和MAOC含量均显著高于农田。综上,柠条林地土壤养分及POC、MAOC含量随着恢复年限增加逐渐降低;与农田相比,天然草地和柠条林地维持和提高土壤养分及碳储存的能力较高。

关键词: 植被恢复, 恢复年限, 土壤剖面, 土壤有机碳组分, 宁南山区

Abstract: Vegetation restoration can effectively enhance soil quality and soil organic carbon (SOC) sequestration. In this study, the distribution characteristics of soil nutrients and SOC along soil profile (0-100 cm), and their responses to restoration years (16, 28, 38 years) were studied in Caragana korshinskii plantations in the southern mountainous area of Ningxia, compared with cropland and natural grassland. The results showed that: 1) the contents of SOC, soil total nitrogen (TN), total phosphorus (TP), particulate organic carbon (POC), mineral-associated organic carbon (MAOC) and the proportion of particulate organic carbon to total organic carbon (POC/SOC) all decreased with increasing soil depth. The ratio of mineral-associated organic carbon to total organic carbon (MAOC/SOC) exhibited an opposite trend. 2) The contents of SOC, TN, TP, C:P, N:P, POC and MAOC gra-dually decreased as the restoration years increased. However, the C:N ratio showed no significant change. The POC/SOC ratio initially increased and then decreased, while the MAOC/SOC ratio decreased initially and then increased. 3) In three different types of vegetation, POC, MAOC, and SOC showed a highly significant positive linear correlation, with the increase in SOC mainly depended on the increase in MAOC. The SOC, TN, TP, POC and MAOC contents in natural grassland and C. korshinskii plantations were significantly higher than those in cropland. In conclusion, soil nutrients and POC and MAOC contents of C. korshinskii plantations gradually decreased with the increases in restoration years. However, when compared with cropland, natural grassland and C. korshinskii plantations demonstrated a greater capacity to maintain and enhance soil nutrient and carbon storage.

Key words: vegetation restoration, restoration years, soil profile, soil organic carbon component, mountainous areas of southern Ningxia

张羽涵, 李瑶, 周玥, 陈圆佳, 安韶山. 宁南山区不同恢复年限柠条林土壤养分及有机碳组分变化特征[J]. 应用生态学报, 2024, 35(3): 639-647.

ZHANG Yuhan, LI Yao, ZHOU Yue, CHEN Yuanjia, AN Shaoshan. Changes of soil nutrients and organic carbon fractions in Caragana korshinskii forests with different restoration years in mountainous areas of southern Ningxia, China[J]. Chinese Journal of Applied Ecology, 2024, 35(3): 639-647.

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宁南山区不同恢复年限柠条林土壤养分及有机碳组分变化特征

Changes of soil nutrients and organic carbon fractions in Caragana korshinskii forests with different restoration years in mountainous areas of southern Ningxia, China

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