轻度放牧促进了沙漠草原中土壤微生物死体碳的积累
Xin Ju1, Bingying Wang2, Tingting Shen1
1Key Laboratory of Grassland Resources of the Ministry of Education, College of Grassland Science, Inner Mongolia Agricultural University, Hohhot, 010011, China.
BMC plant biology
|September 1, 2025
概括
在沙漠草原中,轻度放牧增加了土壤微生物死体碳 (MNC),有助于碳封存. 严重的牧场和土壤深度影响了MNC,和是积累的关键因素.
科学领域:
- 生态学
- 土壤科学
- 环境科学
背景情况:
- 牧场显著影响草原中的土壤有机碳 (SOC) 积累和稳定性.
- 土壤微生物死体碳 (MNC),包括真菌死体碳 (FNC) 和细菌死体碳 (BNC),是SOC的关键组成部分.
- 牧场强度对沙漠草原的土壤MNC及其驱动因素的影响尚不清楚.
研究的目的:
- 研究不同放牧强度对土壤MNC,FNC和BNC的影响.
- 确定土壤深度对土壤MNC的影响.
- 确定草地MNC积累的主要驱动因素.
主要方法:
- 进行了四种强度的放牧实验:控制,轻度,中度和重度放牧.
- 在中国内蒙古的沙漠草原采集了土壤样本.
- 在不同放牧强度和土壤深度 (0-10厘米和20-30厘米) 中分析了土壤MNC,FNC,BNC和土壤营养因素.
主要成果:
- 轻度放牧增加了0-30厘米层的MNC,FNC和BNC,而重度放牧减少了MNC和FNC.
- 随着土壤深度的增加,MNC和BNC的数量减少了 (20-30厘米而不是0-10厘米).
- 菌类死体碳比细菌死体碳的贡献更大;土壤和是MNC积累的关键驱动因素.
结论:
- 轻度放牧增强了土壤MNC积累,有可能改善沙漠草原的碳捕获.
- 土壤是MNC,FNC和BNC的关键调节剂,而土壤主要驱动MNC和FNC.
- 这些发现支持优化牧场管理,以增加干旱草原的土壤有机碳储存.
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