Effects of soil erosion and reforestation on soil respiration, organic carbon and nitrogen stocks in an eroded area of Southern China
Effects of soil erosion and reforestation on soil respiration, organic carbon and nitrogen stocks in an eroded area of Southern China
复制标题
土壤侵蚀和植树造林对中国南方侵蚀区土壤呼吸、有机碳和氮储量的影响
DOI：
10.1016/j.scitotenv.2019.05.221
复制
发表时间：
2019
影响因子：
9.8
通讯作者：
Liu Jian
中科院分区：
文献类型：
--
作者：
Yao Xiong;Yu Kunyong;Wang Guangyu;Deng Yangbo;Lai Zhuangjie;Chen Yan;Jiang Yusen;Liu Jian
土壤侵蚀和重新造林严重影响许多陆地生态系统的功能。然而，土壤侵蚀和造林对土壤呼吸（SR），土壤有机碳（SOC）和总氮（TN）储量的影响尚不清楚。因此，本文研究了南方红壤丘陵区4种不同土壤侵蚀程度（重度、中度、轻度和未侵蚀）和2种不同林龄（8年生和36年生）马尾松人工林土壤有机碳和全氮储量的变化。研究结果表明，土壤侵蚀程度和人工造林显著影响土壤有机碳和全氮储量。同时，平均SR，和SOC和TN库存都显着降低侵蚀水平，但显着增加的时间，因为重新造林。土壤温度指数模型可以解释土壤含水量季节变化的70-92%，而土壤含水量与土壤含水量的关系不显著;结构方程模型表明，0-20 cm土壤有机碳储量对土壤含水量季节变化的影响远大于土壤温度。8年生和36年生马尾松人工林0-20 cm土壤有机碳储量分别比严重侵蚀林地增加177%和558%。本研究强调了再造林是恢复中国南方侵蚀区碳氮储量的有效策略，并强调在不同气候情景下评估区域碳收支时需要考虑土壤侵蚀和再造林的影响。
Soil erosion and reforestation greatly affects the functionality of many terrestrial ecosystems. However, the effects of soil erosion and reforestation on soil respiration (SR), and soil organic carbon (SOC) and total nitrogen (TN) stocks remain unclear. Therefore, we investigated the changes in SR, and SOC and TN stocks at four different soil erosion levels (severely, moderately, lightly, and non-eroded) and two different agedPinus massonianaplantations (8- and 36-year-old) in the hilly red soil regions of Southern China. Our results showed that soil erosion level and reforestation significantly influenced SR, and SOC and TN stocks. Meanwhile, the mean SR, and SOC and TN stocks all significantly decreased with erosion level but increased significantly with times since reforestation. Soil temperature (ST) could explain 70–92% of SR seasonal variation based on exponential models, whereas no significant relationship between SR and soil water content were found. Furthermore, the structural equation modeling indicated that SOC stocks at 0–20 cm had a much stronger effect on SR than ST. Meanwhile, the SOC stocks for 0–20 cm increased by 177% and 558% in the 8- and 36-year-oldPinus massonianaplantations in comparison with the severely eroded forestland, respectively. This study highlights that reforestation could be an effective strategy for restoring the carbon and nitrogen storage in eroded regions of Southern China and emphasizes the need to consider the effects of soil erosion and reforestation when assessing regional carbon budgets under different climate scenarios.