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学者姓名：李晓杰
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Abstract ：
Soil dissolved organic carbon (DOC) is the most active carbon pool, providing essential carbon and energy to soil microorganisms while playing a crucial role in carbon sequestration, transport, and stabilization in soils. Nitrogen (N) addition, a key factor influencing terrestrial carbon cycling, can significantly alter soil DOC dynamics. However, the global patterns and underlying drivers of DOC responses to N addition, particularly across regions with varying aridity indices, remain unclear. This study analyzed 1132 paired observations from 103 independent studies to quantify the response pattern of DOC to N addition in humid (554 observations) and non-humid (574 observations) regions and identify the factors driving these effects. The findings revealed an asymmetrical effect of N addition on soil DOC between humid and non-humid regions, rather than on microbial biomass carbon (MBC) or soil organic carbon (SOC). Specifically, N addition significantly decreased soil DOC (-2.49%) in humid regions, while it increased DOC (7.30%) in non-humid regions. The effect size of soil DOC decreased linearly with the ratio of MBC to SOC in humid regions but increased linearly in non-humid regions. In humid regions, soil DOC response was positively correlated with initial MBC and inversely correlated with initial soil pH, whereas the opposite trend was observed in non-humid regions. Seasonal precipitation variability was identified as a significant driver of soil DOC response, independent of temperature, soil properties, and N addition rates. Moreover, initial SOC content was the primary driving factor for soil DOC response in humid regions, while the N addition rates were the primary driver in non-humid regions. These findings have important implications for enhancing soil carbon pool management, improving global carbon models, and addressing climate change, particularly under varying climatic conditions.
Keyword ：
Driving factors Driving factors Humid regions Humid regions Nitrogen addition Nitrogen addition Non-humid regions Non-humid regions Soil dissolved organic carbon Soil dissolved organic carbon
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| GB/T 7714 | Ren, Tianjing , Smreczak, Bozena , Ukalska-Jaruga, Aleksandra et al. Differential impacts of nitrogen addition on soil dissolved organic carbon in humid and non-humid regions: A global meta-analysis [J]. | JOURNAL OF ENVIRONMENTAL MANAGEMENT , 2025 , 377 . |
| MLA | Ren, Tianjing et al. "Differential impacts of nitrogen addition on soil dissolved organic carbon in humid and non-humid regions: A global meta-analysis" . | JOURNAL OF ENVIRONMENTAL MANAGEMENT 377 (2025) . |
| APA | Ren, Tianjing , Smreczak, Bozena , Ukalska-Jaruga, Aleksandra , Li, Xiaojie , Hassan, Waseem , Cai, Andong . Differential impacts of nitrogen addition on soil dissolved organic carbon in humid and non-humid regions: A global meta-analysis . | JOURNAL OF ENVIRONMENTAL MANAGEMENT , 2025 , 377 . |
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Abstract ：
Global change factors like atmospheric nitrogen (N) deposition and drought pose threats to forest ecosystem including soil microbial diversity. However, how arbuscular mycorrhizal (AM) fungi associated with tree respond to N deposition and drought remains largely unknown. Here root- and soil-inhabiting AM fungi were examined in a field experiment involving N addition and simulated drought (precipitation exclusion) in a Chinese fir (Cunninghamia lanceolata) plantation. The results showed that precipitation exclusion significantly reduced AM fungal intraradical colonization rate in summer, while N addition had no significant effect on AM fungal morphological traits of intraradical colonization rate, hyphal and spore densities. However, seasonal changes significantly affected AM fungal morphological traits, with higher values were observed in summer than in winter. Neither N addition nor drought significantly affected AM fungal diversity or community composition, but AM fungal communities exhibited pronounced seasonal differences. In winter, both root- and soil-associated AM fungal community composition significantly correlated with the ratio of microbial biomass carbon and phosphorus (MBC/MBP), while in summer AM fungal communities were primarily associated with MBP and DOC. These findings highlight the importance of accounting for interaction of N addition and drought, and seasonal response difference on AM fungi in subtropical forest ecosystems.
Keyword ：
Arbuscular mycorrhizal fungi Arbuscular mycorrhizal fungi Community structure Community structure Diversity Diversity Drought Drought Simulated nitrogen deposition Simulated nitrogen deposition
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| GB/T 7714 | Shi, Jiamian , Li, Xiaojie , Song, Ge et al. Response of root- and soil-associated AM fungi to nitrogen addition and simulated drought in a Chinese fir plantation [J]. | GEODERMA , 2025 , 454 . |
| MLA | Shi, Jiamian et al. "Response of root- and soil-associated AM fungi to nitrogen addition and simulated drought in a Chinese fir plantation" . | GEODERMA 454 (2025) . |
| APA | Shi, Jiamian , Li, Xiaojie , Song, Ge , Jin, Shengsheng , Zhou, Luhong , Lyu, Maokui et al. Response of root- and soil-associated AM fungi to nitrogen addition and simulated drought in a Chinese fir plantation . | GEODERMA , 2025 , 454 . |
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Microbial nitrogen use efficiency (NUE) describes the partitioning of organic N between microbial growth and N mineralization, which is crucial for assessing soil N retention. However, how warming affects NUE along soil depth remains unclear. Based on a whole-soil-profile warming experiment (0 to 100 cm, +4 degrees C) on the Qinghai-Tibetan Plateau, combined with 18O and 15N isotope labeling techniques, we determined soil carbon (C) composition, edaphic properties, and microbial parameters. The results showed that NUE declined with soil depth in both control and warming treatments, driven by microbial C limitation. The response of NUE to warming varied with soil depth. Warming reduced topsoil (0-30 cm) microbial N growth, ultimately leading to a decrease in NUE, but had no effect in deep soils (30-100 cm). Jointly, these findings highlight that warming may exacerbate soil N loss in topsoil, and that maintaining microbial C and N availability could be a key strategy for preserving microbial N sequestration under warming conditions.
Keyword ：
gross nitrogen mineralization gross nitrogen mineralization increase temperature increase temperature isotope labelling isotope labelling soil carbon composition soil carbon composition soil depth soil depth
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| GB/T 7714 | Zhang, Qiufang , Qin, Wenkuan , Li, Xiaojie et al. Soil Carbon Availability Drives Depth-Dependent Responses of Microbial Nitrogen Use Efficiency to Warming [J]. | GLOBAL CHANGE BIOLOGY , 2025 , 31 (9) . |
| MLA | Zhang, Qiufang et al. "Soil Carbon Availability Drives Depth-Dependent Responses of Microbial Nitrogen Use Efficiency to Warming" . | GLOBAL CHANGE BIOLOGY 31 . 9 (2025) . |
| APA | Zhang, Qiufang , Qin, Wenkuan , Li, Xiaojie , Feng, Jiguang , Chen, Yuehmin , Zhang, Zhenhua et al. Soil Carbon Availability Drives Depth-Dependent Responses of Microbial Nitrogen Use Efficiency to Warming . | GLOBAL CHANGE BIOLOGY , 2025 , 31 (9) . |
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The priming effects (PEs) of soil organic carbon (SOC) is a crucial process affecting the C balance of terrestrial ecosystems. However, there is uncertainty about how PEs will respond to climate warming. Here, we sampled soils along a subtropical elevation gradient in China and conducted a 126-day lab-incubation experiment with and without additions of C-13-labeled high-bioavailability glucose or low-bioavailability lignin. Based on the mean annual temperature (MAT) of each elevation (9.3-16.4 degrees C), a temperature increase of 4 degrees C was used to explore how PEs mediate the decomposition of SOC in response to warming. Our results showed that the magnitude of glucose-induced PEs (PEglu) was higher than lignin-induced PEs (PElig), with both PEs linearly increasing with MAT. Across the MAT (i.e., elevation) gradient, warming had consistent negative effects on PEglu, whereas rising MAT exacerbated the negative effects of warming on PElig. Moreover, the temperature sensitivity of SOC decomposition decreased after adding glucose and lignin across the MAT gradient, suggesting that fresh C inputs may prime microbial breakdown of labile SOC under warming. Taken together, warming alleviated the SOC loss due to PEs through varying mechanisms depending on substrate bioavailability, since warming mediated the PEglu by increasing available nitrogen and weakening microbial nitrogen-mining but inhibited the PElig by switching from microbial nitrogen-mining to microbial co-metabolization. Our findings highlight the role of warming in regulating the PEs and suggest that incorporating the suppression effect of warming on PEs can contribute to the accurate prediction of soil C dynamics in a warming world.
Keyword ：
C-13-PLFA C-13-PLFA priming effects priming effects substrate quality substrate quality temperature gradient temperature gradient warming warming
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| GB/T 7714 | Li, Xiaojie , Lyu, Maokui , Zhang, Qiufang et al. Warming Reduces Priming Effect of Soil Organic Carbon Decomposition Along a Subtropical Elevation Gradient [J]. | GLOBAL BIOGEOCHEMICAL CYCLES , 2024 , 38 (6) . |
| MLA | Li, Xiaojie et al. "Warming Reduces Priming Effect of Soil Organic Carbon Decomposition Along a Subtropical Elevation Gradient" . | GLOBAL BIOGEOCHEMICAL CYCLES 38 . 6 (2024) . |
| APA | Li, Xiaojie , Lyu, Maokui , Zhang, Qiufang , Feng, Jiguang , Liu, Xiaofei , Zhu, Biao et al. Warming Reduces Priming Effect of Soil Organic Carbon Decomposition Along a Subtropical Elevation Gradient . | GLOBAL BIOGEOCHEMICAL CYCLES , 2024 , 38 (6) . |
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Soil organic carbon storage in soil carbon models is highly sensitive to microbial carbon use efficiency (CUE); thus, to reliably predict C storage requires quantifying the response of CUE to warming. By conducting a metaanalysis of 87 observations from field warming experiments worldwide, we found that field warming has no significant effect on CUE, which remains constant at 0.35 +/- 0.19 (mean +/- SD) on average. The effect of field warming on CUE is independent of climate factors, incubation temperatures, ecosystem types, warming methods, or CUE measurement methods. The field warming effect on CUE was best explained by the response ratios of microbial biomass -specific growth and microbial biomass -specific respiration according to a multi-model selection, and there was a limited effect of warming on microbial biomass -specific growth and microbial biomass -specific respiration. Overall, the effect of field warming on CUE may be attributed to microbial acclimation. Similarly, insignificant effect of laboratory warming on CUE was observed. Our work highlights that current soil carbon models assuming that CUE decreases with warming may underestimate future soil carbon storage, and calls for more research to explore the regulatory role of microbial community attributes on CUE.
Keyword ：
Field warming Field warming Incubation temperature Incubation temperature Microbial biomass Microbial biomass Microbial carbon use efficiency Microbial carbon use efficiency Microbial growth rate Microbial growth rate Microbial respiration Microbial respiration
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| GB/T 7714 | Zhang, Qiufang , Feng, Jiguang , Li, Xiaojie et al. Effect of field warming on soil microbial carbon use efficiency--A meta-analysis [J]. | SOIL BIOLOGY & BIOCHEMISTRY , 2024 , 197 . |
| MLA | Zhang, Qiufang et al. "Effect of field warming on soil microbial carbon use efficiency--A meta-analysis" . | SOIL BIOLOGY & BIOCHEMISTRY 197 (2024) . |
| APA | Zhang, Qiufang , Feng, Jiguang , Li, Xiaojie , Chen, Yuehmin , Schimel, Joshua P. , Zhu, Biao . Effect of field warming on soil microbial carbon use efficiency--A meta-analysis . | SOIL BIOLOGY & BIOCHEMISTRY , 2024 , 197 . |
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