氮添加降低了半干旱草原土壤呼吸但未改变其温度敏感性（英文）
发布时间：2024-07-06 08:01
半干旱生态系统土壤呼吸(Rs)对氮添加的响应机制仍有待探索。本研究在中国半干旱草原设置不同氮添加水平(0、2、4、8、16、32 gN m-2 yr-1),测定土壤呼吸速率、土壤温湿度、微生物磷脂脂肪酸、土壤理化性质与地上生物量等指标,探讨氮添加对土壤呼吸及其温度敏感性(Q10)的影响。结果表明:氮添加显著增加了土壤可溶性有机碳(DOC)和无机氮(IN)的含量,降低了土壤pH值,对地上生物量(ABM)无显著影响。氮添加降低了磷脂脂肪酸(PLFAs)的总量,降低了真菌细菌比(F:B),提高了革兰氏阳性阴性菌比(G+:G–)。氮添加显著降低了土壤呼吸,N2、N4、N8、N16和N32处理下的土壤呼吸分别比对照N0变化了–2.58%、14.86%、22.62%、23.97%和19.87%,结构方程模型表明,氮添加通过降低PLFAs总量和改变微生物组成降低土壤呼吸。氮添加对温度敏感性(Q10)、土壤总有机碳(TOC)和总氮(TN)的影响均不显著,表明氮添加减轻了土壤碳的损失,且不会改变全球变暖背景下土壤有机...
【文章页数】：11 页
【文章目录】：
1 Introduction
2 Materials and methods
2.1 Study area
2.2 Experimental design
2.3 Soil respiration
2.4 Soil properties and aboveground biomass
2.5 Soil phospholipid fatty acids
2.6 Statistical analysis
3 Results
3.1 Soil properties and aboveground biomass
3.2 Soil microbial phospholipid fatty acids
3.3 Rs and Q10
3.4 Relationships between soil respiration and the various impact factors
4 Discussion
4.1 The responses of soil properties and soil microbial community to N addition
4.2 The responses of Rs and Q10 to N addition
5 Conclusion
本文编号：4002298
【文章页数】：11 页
【文章目录】：
1 Introduction
2 Materials and methods
2.1 Study area
2.2 Experimental design
2.3 Soil respiration
2.4 Soil properties and aboveground biomass
2.5 Soil phospholipid fatty acids
2.6 Statistical analysis
3 Results
3.1 Soil properties and aboveground biomass
3.2 Soil microbial phospholipid fatty acids
3.3 Rs and Q10
3.4 Relationships between soil respiration and the various impact factors
4 Discussion
4.1 The responses of soil properties and soil microbial community to N addition
4.2 The responses of Rs and Q10 to N addition
5 Conclusion
本文编号：4002298
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