長白山垂直帶森林葉片-凋落物-土壤連續(xù)體有機碳動態(tài)——基于穩(wěn)定性碳同位素分析
[Abstract]:The natural abundance of stable carbon isotopes (未 ~ (13) C), which records the key information of carbon cycle in ecosystems, is often used to evaluate the dynamics of terrestrial carbon in global change scenarios. Taking four typical forest ecosystems on the north slope of Changbai Mountain as the research object, the contents of (SOC) and 未 ~ (13) C in leaves, litter and soil of different depths of Arbor species were measured. The distribution pattern of 未 ~ (13) C abundance in plant leaves, litter and soil continuum and its ecological implications were studied. The results showed that the carbon content of plant leaves varied parabola with the increase of altitude, and the carbon content of broad-leaved leaves was significantly lower than that of coniferous trees, which reflected the dominance of climatic factors and vegetation functional types. It also suggests that the potential carbon accumulation of coniferous trees is stronger. In addition, 未 ~ (13) C of plant leaves decreased with the increase of altitude, which indicated that the water use efficiency of leaves at high altitude was lower, that is, the cost of carbon sequestration water consumption was higher. The carbon content of litter decreased gradually with the increase of altitude, while the mineral surface soil was shown as broad-leaved Korean pine forest, and the Yuebirch forest was significantly higher than the dark coniferous forest, which reflected the joint dominance of vegetation type and soil texture. In general, the SOC turnover of the birch forest was the fastest, followed by the dark coniferous forest, and the broad-leaved Korean pine forest located in the basal zone was the slowest. It can be seen that climate factor is not the dominant factor of underground carbon cycle in temperate forest on a small scale, and vegetation function type and soil attribute have more influence on SOC turnover and stability. In order to study the impact of environmental factors on the carbon cycle and carbon balance in terrestrial ecosystems, we should consider the scale of study. The driving factors of SOC turnover are not the same in different research scales. In terms of research methods, the SOM turnover model based on log SOC and 未 ~ (13) C can well summarize the relative speed of SOM turnover under different ecosystem types, and can be used to evaluate the dynamic response of SOC to global change.
【作者單位】: 中國科學院大學資源與環(huán)境學院;中國科學院地理科學與資源研究所/生態(tài)系統(tǒng)觀測與模擬重點實驗室;
【基金】:國家自然科學基金資助項目(41471212,31470558,31290222,31290221) 國家重點研發(fā)計劃資助項目(2016YFC0500603,2016YFC0503603) 青年創(chuàng)新研究團隊資助項目(LENOM2016Q0004)
【分類號】:S714
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