Topography modifies the effect of land-use change in soil respiration: A meta-analysis
Topography modifies the effect of land-use change in soil respiration: A meta-analysis
复制标题
地形改变土地利用变化对土壤呼吸的影响：荟萃分析
DOI：
10.1002/ecs2.3845
复制
发表时间：
2021
期刊：
影响因子：
2.7
通讯作者：
Xueliang Ju
中科院分区：
文献类型：
--
作者：
Yanjun Zhang;Junliang Zou;Shuina Dang;Bruce Osborne;Yuanyuan Ren;Xueliang Ju
土壤呼吸受与农田植被恢复相关的土地利用变化控制，这可能因地形而异，尽管这种影响的程度和潜在机制仍不清楚。我们综合了中国最近发表的69篇论文，探讨了地形相关的土地利用变化对土壤呼吸的影响，其中农田被转化为果园（缩写为C‐O），草地（缩写为C‐G）或林地（缩写为C‐W）。我们的研究结果表明，不仅土地利用变化对土壤呼吸有显着的影响，但这与地形不同。虽然C‐O导致土壤呼吸平均减少3.1%，但变化的幅度和符号因地形而异，平坦地区增加8.2%，斜坡减少14.7%。对于C-G转换，土壤呼吸平均增加了21.4%，平坦和斜坡地形分别增加了19.5%和24.3%。对于C-W，土壤呼吸平均增加了28.0%，平坦地区仅增加了1.6%，但斜坡增加了39.9%。土壤温度、土壤水分、根系生物量、土壤有机碳、土壤微生物生物量碳、土壤碳氮比和土壤密度也随地形而变化，坡度的变化大于平坦地形。不同地形下土壤呼吸的增加与土壤温度、土壤有机碳、微生物量碳和根系生物量的变化密切相关（P< 0.05），而与土壤水分、碳氮比和土壤密度的变化无关（P> 0.05）。不同地形条件下，不同驱动因子对土壤呼吸变化的贡献表现为SOC >根系生物量> MBC >土壤温度。基于这些结果，在量化土地利用变化对碳预算的影响时，需要考虑地形相关的土壤呼吸变化。
Soil respiration is controlled by land‐use changes associated with cropland vegetation restoration, and this can vary with topography, although the magnitude of this effect and the underlying mechanisms are still unclear. We synthesized 69 recently published papers from China to explore the influence of topography‐related changes in land use on soil respiration where croplands were converted into orchards (abbreviated as C‐O), grasslands (abbreviated as C‐G), or woodlands (abbreviated as C‐W). Our results showed that not only did land‐use change have a significant influence on soil respiration, but this varied with topography. While C‐O resulted in a decrease in soil respiration by, on average, 3.1%, both the magnitude and sign of the change varied with topography, with an 8.2% increase for flat areas and a 14.7% decrease for slopes. For the C‐G conversions, soil respiration increased, on average, by 21.4%, with a 19.5% and a 24.3% increase for flat and slope topography, respectively. For C‐W, soil respiration increased, on average, by 28.0%, with only a 1.6% increase for flat areas, but a 39.9% increase for slopes. Soil temperature, soil moisture, root biomass, soil organic carbon (SOC), soil microbial biomass carbon (MBC), soil carbon‐to‐nitrogen ratio (C:N ratio), and soil density also varied with topography, with larger changes for slopes than for flat topography. Increases in soil respiration associated with different topography were closely related to changes in soil temperature, SOC, MBC, and root biomass (P< 0.05), but were not correlated with changes in soil moisture, C:N ratio, or soil density (P> 0.05). The contribution of different drivers to the change in soil respiration under different topographical conditions showed a trend of SOC > root biomass > MBC > soil temperature. Based on these results, topography‐related variations in soil respiration need to be accounted for when quantifying the impact of land‐use change on C budgets.