Linking soil extracellular enzymes with soil respiration under altered litter inputs

IF 5.6 1区农林科学 Q1 AGRONOMY

Agricultural and Forest Meteorology Pub Date : 2025-03-18 DOI:10.1016/j.agrformet.2025.110503

Hao Chen , Qianhao Xu , Kees Jan van Groenigen , Bruce A. Hungate , Pete Smith , Dejun Li , Daryl L. Moorhead , Brooke B. Osborne , Zilong Ma , Jørgen E. Olesen , Chaoqun Wang , Ji Liu , Xibin Sun , Chengjin Chu , Ji Chen

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Abstract

Climate and land-use changes have altered both litter quality and quantity, with cascading impacts on soil respiration (SR). Soil extracellular enzymes (EEs) like cellulase and ligninase are crucial for deconstructing plant litter because they convert polymers into monomers. However, whether and how changes in litter inputs influence soil cellulase and ligninase activities as well as the implications for SR remain poorly understood. We conducted a global meta-analysis of 827 observations on the responses of SR and soil cellulase and ligninase activities to litter addition and litter removal. Litter addition significantly increased cellulase activity by 25 %, whereas litter removal decreased it by 26 %. Neither litter addition nor litter removal affected ligninase activity. Changes in cellulase activity correlated positively with SR under both litter addition and litter removal, but no such relationship was found for ligninase activity. These results indicate that changes in litter inputs affect SR primarily by affecting the microbial decomposition of readily decomposable rather than more structurally complex carbon pools. In addition, the effects of changes in litter inputs on cellulase activity decreased with treatment duration, suggesting that the long-term effects of changes in litter inputs on SR might be smaller than previously thought. Our results underscore the dominant role of cellulase in mediating the responses of SR to altered litter inputs. Integrating cellulase responses to altered litter inputs into Earth system models could improve the representation of microbial processes and refine the predictions of soil carbon dynamics.

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凋落物输入改变下土壤细胞外酶与土壤呼吸的关系

气候和土地利用变化改变了凋落物的质量和数量，并对土壤呼吸（SR）产生级联影响。土壤细胞外酶（EEs）如纤维素酶和木质素酶对分解植物凋落物至关重要，因为它们将聚合物转化为单体。然而，凋落物输入的变化是否以及如何影响土壤纤维素酶和木质素酶活性以及对SR的影响仍然知之甚少。我们对827个观测数据进行了荟萃分析，研究了SR、土壤纤维素酶和木质素酶活性对凋落物添加和清除的响应。添加凋落物可使纤维素酶活性显著提高25%，而去除凋落物可使纤维素酶活性降低26%。凋落物添加和凋落物去除均不影响木质素酶活性。在凋落物添加和凋落物去除条件下，纤维素酶活性的变化与SR呈正相关，而木质素酶活性的变化与SR无显著相关。这些结果表明，凋落物输入的变化主要通过影响易分解碳库的微生物分解而不是结构更复杂的碳库来影响SR。此外，凋落物投入对纤维素酶活性的影响随着处理时间的延长而降低，这表明凋落物投入对SR的长期影响可能比之前认为的要小。我们的研究结果强调了纤维素酶在调节SR对改变凋落物输入的反应中的主导作用。将纤维素酶对凋落物输入的响应整合到地球系统模型中，可以改善微生物过程的表征，并改进土壤碳动态的预测。

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来源期刊

Agricultural and Forest Meteorology 农林科学-林学

CiteScore

10.30

自引率

9.70%

发文量

415

审稿时长

69 days

期刊介绍： Agricultural and Forest Meteorology is an international journal for the publication of original articles and reviews on the inter-relationship between meteorology, agriculture, forestry, and natural ecosystems. Emphasis is on basic and applied scientific research relevant to practical problems in the field of plant and soil sciences, ecology and biogeochemistry as affected by weather as well as climate variability and change. Theoretical models should be tested against experimental data. Articles must appeal to an international audience. Special issues devoted to single topics are also published. Typical topics include canopy micrometeorology (e.g. canopy radiation transfer, turbulence near the ground, evapotranspiration, energy balance, fluxes of trace gases), micrometeorological instrumentation (e.g., sensors for trace gases, flux measurement instruments, radiation measurement techniques), aerobiology (e.g. the dispersion of pollen, spores, insects and pesticides), biometeorology (e.g. the effect of weather and climate on plant distribution, crop yield, water-use efficiency, and plant phenology), forest-fire/weather interactions, and feedbacks from vegetation to weather and the climate system.