The effect of enhanced rock weathering on soil respiration was modulated by understory removal in a subtropical fir plantation

IF 5.7 1区农林科学 Q1 AGRONOMY

Agricultural and Forest Meteorology Pub Date : 2025-10-09 DOI:10.1016/j.agrformet.2025.110876

Renshan Li , Yankuan Zhang , Yanfeng Bai , Xiongqing Zhang , Fangfang Zhang , Xinkuan Han , Honggang Sun , Weidong Zhang , Qingpeng Yang , Silong Wang

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Abstract

Enhanced rock weathering (ERW) involving the modification of soils with crushed silicate rock is proposed an efficient CO₂ removal technology. However, a comprehensive understanding of the influence of silicate rock application on soil respiration (R_s), especially under different silvicultural regimes, is still lacking, limiting our awareness of the potential for ERW to remove CO₂. In this study, a wollastonite addition (WA) experiment was conducted in a Chinese fir plantation with or without understory removal (UR). The R_s and its heterotrophic (R_h) and autotrophic (R_a) components were measured for each treatment over a two-year period. Results showed that WA significantly increased R_s and R_a by 16.1 % and 51.8 %, respectively, but had no effect on R_h. Soil pH value was markedly increased by WA by 12.5 %, from 4.40 to 4.95, on average. The concentrations of available Si and exchangeable Ca and Mg increased but that of exchangeable Al decreased after WA. It seems that WA has provided the plants with higher nutrient availability and lower aluminum toxicity, thereby benefiting root activity. This pattern was evidenced by the positive correlations between R_a and soil pH value, exchangeable Ca and available Si concentration, as well as by the negative correlation between R_a and exchangeable Al concentration. Moreover, the effect of WA on R_s was interactively regulated by UR, leading to a weaker WA effect at understory-free stands. This study highlighted that the increase in soil CO₂ efflux by WA should be taken into consideration while assessing the CO₂ removal potential from ERW.

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亚热带冷杉人工林林下植被去除可调节岩石风化对土壤呼吸的影响

提出了用破碎的硅酸盐岩石对土壤进行改性的增强岩石风化（ERW）技术，这是一种有效的CO2脱除技术。然而，对硅酸盐岩施用对土壤呼吸（Rs）的影响的全面了解，特别是在不同的造林制度下，仍然缺乏，限制了我们对ERW去除CO2潜力的认识。本研究在杉木人工林中进行了硅灰石添加（WA）试验。在两年的时间里，测定了每次处理的Rs及其异养（Rh）和自养（Ra）成分。结果表明，WA能使Rs和Ra分别提高16.1%和51.8%，但对Rh无显著影响。WA使土壤pH值平均由4.40提高到4.95，显著提高12.5%。水处理后有效硅、交换性钙、镁的浓度升高，交换性铝的浓度降低。似乎WA为植株提供了更高的养分有效性和更低的铝毒性，从而有利于根系活性。Ra与土壤pH值、交换性Ca和有效Si浓度呈显著正相关，Ra与交换性Al浓度呈显著负相关。在无林下林分，WA对Rs的影响受UR的交互调节，导致WA对Rs的影响较弱。本研究强调，在评估废液对CO2的去除潜力时，应考虑西洋水对土壤CO2外排的增加。

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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.