木质植物减少了由降水控制的土壤有机碳
1State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China; School of Natural Resources, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China.
Journal of environmental management
|February 23, 2025
概括
木质植物对草原土壤有机碳 (SOC) 产生负面影响,减少总有机碳 (TOC) 和矿物相关有机碳 (MAOC),同时增加溶解有机碳 (DOC). 年平均降水量 (MAP) 是这些变化的主要驱动因素.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 环境科学 环境科学
背景情况:
- 木质植物的侵占对全球草原生态系统构成重大生态挑战.
- 了解土壤有机碳 (SOC) 分数如何随着沿着降水梯度的木质植物的存在而变化至关重要,但不太了解.
研究的目的:
- 调查 SOC 分数在灌木覆盖和本地草原中的特征.
- 探索影响中国北部降水梯度沿线SOC分数的关键因素.
- 揭示木质植物对草原SOC动态的影响.
主要方法:
- 利用"空间换时间"方法研究中国北部降水梯度沿线的草原.
- 分析了土壤有机碳 (SOC) 分数,包括总有机碳 (TOC),矿物相关有机碳 (MAOC),溶解有机碳 (DOC) 和有机颗粒碳 (POC).
- 雇员冗余分析 (RDA) 和部分最小平方路径建模 (PLSPM) 以确定控制因素.
主要成果:
- 木质植物降低了TOC和MAOC,同时增加了草原中的DOC.
- 年平均降水量 (MAP) 是控制SOC分量的主要因素,解释了71.6%的变化.
- 112-130毫米的降水值被确定为由木质植物引起的SOC分数变化的一个转折点.
- TOC含量最初增加,然后随着降水量增加而下降 (R2 = 0.52),而POC显示相反的趋势 (R2 = 0.59).
- 控制因素从原生草原的MAP转向了植物性质和灌木覆盖草原的MAP的组合.
结论:
- 木质植物的侵占通常对草原土壤有机碳产生负面影响.
- 年平均降水量是调节木质植物和土壤有机碳之间的相互作用的关键因素.
- 这些发现为草原生态系统中灌木-降雨-SOC相互作用的复杂动态提供了新的见解.
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