柳杉
时序
土壤碳
粳稻
总有机碳
环境科学
碳纤维
固碳
碳循环
农学
环境化学
生态系统
化学
土壤科学
生态学
植物
土壤水分
生物
数学
二氧化碳
复合数
算法
作者
Xianpei Han,Xuan Li,Zhiwei Li,Jiao Li,Yaling Yuan,Han Li,Li Zhang,Yang Liu,Lixia Wang,Chengming You,Bo Tan,Zhenfeng Xu
出处
期刊:Forests
[MDPI AG]
日期:2022-10-10
卷期号:13 (10): 1663-1663
被引量:3
摘要
Soil organic carbon (SOC) is critical for carbon cycling and sequestration in forest ecosystems. However, how stand age affects SOC components and stability still remains poorly understood. Here, soil samples (0–20 cm) were collected from Cryptomeria japonica var. sinensis (L. f.) D. Don plantations of seven stand ages (6, 12, 23, 27, 32, 46, 52 a) in the rainy area of western China. SOC fractions, including soil particulate organic carbon (POC), easily oxidizable carbon (EOC), labile organic carbon (LOC), recalcitrant organic carbon (ROC), and light fraction organic carbon (LFOC), were determined to explore the nature of carbon components and stability across a chronosequence of C. japonica plantation. Soil carbon fractions first increased and then trended to be stable with an increase in stand age. SOC concentrations were the largest in mature forests (27 or 32 a), but the concentrations of other carbon components often peaked in early over-mature forests (46 a). The concentrations of all carbon fractions were the lowest in the young forests (6 a). The ratios of ROC/SOC increased and LOC/SOC decreased with increasing stand age. Almost all carbon fractions were positively correlated with soil bulk density and negatively correlated with soil moisture. The allometric exponent of ROC or HFOC and soil physicochemical properties was higher as compared to LOC and LFOC. The results noted in this study indicate that SOC components often accumulate fast over the first 20 years of afforestation and SOC stability increases with increasing stand age for C. japonica plantation in this specific region.
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