Temperature sensitivity of soil respiration to nitrogen and phosphorous fertilization: Does soil initial fertility matter?
Sun, Qiqi1,2; Wang, Rui3; Wang, Ying1,2; Du, Lanlan4; Zhao, Man3; Gao, Xin4; Hu, Yaxian4; Guo, Shengli1,2,3
Source PublicationGEODERMA
Corresponding AuthorGuo, Shengli(slguo@ms.iswc.ac.cn)
AbstractTemperature sensitivity of soil respiration (Q(10)) is an important parameter when modeling the effects of global warming on terrestrial ecosystem carbon release. Widely applied chemical fertilizers can significantly affect soil productivity and carbon cycling in agroecosystems. However, little is known about how Q(10) responds to chemical fertilization under different levels of initial soil fertility. On the Chinese Loess Plateau, changes in soil respiration rates and Q(10) were investigated in soils of two fertility levels: low fertility (L) and high fertility (H). For each soil fertility level, there was one control plot and one chemical fertilized plot (+ NP), which in total formed four treatments: L, L + NP, H and H + NP. All the treatments were replicated for three times on a continuous winter wheat cropping system. Respiration rates of surface soil in each treatment were in situ monitored from October 2010 through September 2015. Our results showed that after NP fertilization, soil respiration rates were increased by 46% in low fertility soil, yet only by 14% in high fertility soil (P < 0.05). The Q(10) after NP fertilization was significantly decreased by 6.9% in low fertility soil, but was unchanged in the high fertility soil. The Q(10) variation might be attributed to the different response of microbial respiration Q(10) in the two soils. The decreased Q(10) with NP fertilization in the low fertility soil was possibly due to N-induced increase of substrate quality for soil microbes and increased activities of both cellobiohydrolase and polyphenol oxidase. In the high fertility soil, the unchanged Q(10 )with NP fertilization may be the integrated result of less affected substrate quality and neutral response of polyphenol oxidase activity. Overall, our results suggested that the effects of NP fertilization on soil respiration and its temperature sensitivity varied with soil initial fertility levels, and therefore must be properly accounted for when estimating potential effects of local agricultural management to regional agroecosystems under future climate conditions.
KeywordSoil fertility NP fertilization Q(10) Soil respiration
Indexed BySCI
Funding ProjectNatural Science Foundation of China[41371279] ; Natural Science Foundation of China[41301322] ; Chinese Universities Scientific Fund[2014YB055]
Funding OrganizationNatural Science Foundation of China ; Chinese Universities Scientific Fund
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000432499000017
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGuo, Shengli
Affiliation1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shannxi, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Northwest A&F Univ, Coll Resources & Environm, Yangling 712100, Shannxi, Peoples R China
4.Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
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GB/T 7714
Sun, Qiqi,Wang, Rui,Wang, Ying,et al. Temperature sensitivity of soil respiration to nitrogen and phosphorous fertilization: Does soil initial fertility matter?[J]. GEODERMA,2018,325:172-182.
APA Sun, Qiqi.,Wang, Rui.,Wang, Ying.,Du, Lanlan.,Zhao, Man.,...&Guo, Shengli.(2018).Temperature sensitivity of soil respiration to nitrogen and phosphorous fertilization: Does soil initial fertility matter?.GEODERMA,325,172-182.
MLA Sun, Qiqi,et al."Temperature sensitivity of soil respiration to nitrogen and phosphorous fertilization: Does soil initial fertility matter?".GEODERMA 325(2018):172-182.
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