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极端的土壤湿度条件更有可能导致土壤呼吸和生态系统呼吸之间的偏差
Chunxue Han1, Tingxi Liu2, Xixi Lu3
1College of Resources and Environmental Sciences, Inner Mongolia Agricultural University, Hohhot, 010011, China.
Journal of environmental management
|September 25, 2025
概括
了解生态系统呼吸 (Reco) 和土壤呼吸 (Rs) 对于陆地碳流至关重要. 这项研究提出了在极端土壤湿度条件下Reco数据的新插值方法,解决Rs和Reco之间的差异.
科学领域:
- 生态生态学 生态生态学
- 陆地生态系统 地球生态系统
- 生物地质化学循环的过程
背景情况:
- 生态系统呼吸 (Reco) 和土壤呼吸 (Rs) 是陆地碳流的关键组成部分.
- Reco和Rs之间的差异以及它们的插值方法尚未完全理解,尤其是在极端的水文条件下.
- 之前的研究缺乏适当的方法来插曲Reco数据在有限的土壤水分的生态系统.
研究的目的:
- 研究生态系统呼吸 (Reco) 和土壤呼吸 (Rs) 之间的偏差的原因.
- 为在经历极端土壤湿度条件的生态系统中缺少Reco数据开发适当的插值方法.
- 分析土壤水分 (Ms) 和温度 (Ts,Tair) 在不同现象学阶段对Rs和Reco的影响.
主要方法:
- 在2015年和2016年的生长季节,在Horqin Sandy Land的两个地点 (移动沙丘和草地) 进行了Rs和Reco的实地观测.
- 分析土壤水分 (Ms) 和温度 (Ts,T空气) 对不同生长周期的呼吸流的影响.
- 开发基于Ms和Tair的Reco数据的断片插入方法,考虑不同的现象学阶段和极端的土壤湿度条件.
主要成果:
- 温度和土壤湿度对Rs和Reco的影响在不同的生长时期有很大的不同.
- 确定了影响草原生态系统Rs和Reco的土壤湿度的值.
- Rs和Reco之间的差异归因于表面不均,植被不齐,以及海拔变化,特别是在极端的土壤水分压力下.
结论:
- 在极端的土壤湿度条件下,为估计缺失的Reco数据提出了一种新的断片互插方法.
- 了解导致Rs和Reco之间的偏差的因素对于准确的碳流量估计至关重要.
- 这些发现为改善半干旱沙地生态系统中的碳流模型提供了宝贵的见解.
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