氮添加降低了半干旱草原土壤呼吸但未改變其溫度敏感性（英文）
發(fā)布時(shí)間：2024-07-06 08:01
半干旱生態(tài)系統(tǒng)土壤呼吸(Rs)對(duì)氮添加的響應(yīng)機(jī)制仍有待探索。本研究在中國(guó)半干旱草原設(shè)置不同氮添加水平(0、2、4、8、16、32 gN m-2 yr-1),測(cè)定土壤呼吸速率、土壤溫濕度、微生物磷脂脂肪酸、土壤理化性質(zhì)與地上生物量等指標(biāo),探討氮添加對(duì)土壤呼吸及其溫度敏感性(Q10)的影響。結(jié)果表明:氮添加顯著增加了土壤可溶性有機(jī)碳(DOC)和無(wú)機(jī)氮(IN)的含量,降低了土壤pH值,對(duì)地上生物量(ABM)無(wú)顯著影響。氮添加降低了磷脂脂肪酸(PLFAs)的總量,降低了真菌細(xì)菌比(F:B),提高了革蘭氏陽(yáng)性陰性菌比(G+:G–)。氮添加顯著降低了土壤呼吸,N2、N4、N8、N16和N32處理下的土壤呼吸分別比對(duì)照N0變化了–2.58%、14.86%、22.62%、23.97%和19.87%,結(jié)構(gòu)方程模型表明,氮添加通過(guò)降低PLFAs總量和改變微生物組成降低土壤呼吸。氮添加對(duì)溫度敏感性(Q10)、土壤總有機(jī)碳(TOC)和總氮(TN)的影響均不顯著,表明氮添加減輕了土壤碳的損失,且不會(huì)改變?nèi)蜃兣尘跋峦寥烙袡C(jī)...
【文章頁(yè)數(shù)】：11 頁(yè)
【文章目錄】：
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
本文編號(hào)：4002298
【文章頁(yè)數(shù)】：11 頁(yè)
【文章目錄】：
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
本文編號(hào)：4002298
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