The impact of agricultural land use on the linkages between soil microbial communities and agroecosystem functioning is depth-dependent

IF 6 1区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Agriculture, Ecosystems & Environment Pub Date : 2024-10-19 DOI:10.1016/j.agee.2024.109330

Wenchao Cao , Yukun Zou , Gang Li , Ying Shan , Jinchuang Wang , Brajesh Kumar Singh

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Abstract

Soil carbon (C) and nitrogen (N) mineralization rates are critical indicators of ecosystem functioning in agricultural land. However, the effects of agricultural land use on the interactions between soil C and N mineralization at different soil depths, especially in tropical regions, are poorly understood. Here, a longan orchard (LO) was converted to a conventional tea plantation (CTP) and an organic tea plantation (OTP) in the tropical region of China, and the responses of fungal and bacterial communities to these changes were assessed. The characteristics of the microbial communities, enzyme activities, and N and C mineralization rates were evaluated in response to the changes in land use. It was found that LO and OTP had faster N and C mineralization rates than CTP in surface soil. However, in subsurface soil, LO and OTP showed a faster C mineralization rate and a slower N mineralization rate than CTP. Structural equation modeling revealed that pH and C/N were the most crucial factors affecting N and C mineralization rates in surface soil. In contrast,soil bacterial and fungal community structures were the principal drivers of both the C and N mineralization in subsurface soil. Although soil C and net N mineralization were positively correlated in surface soil, this was not seen in subsurface soil. Collectively, this study demonstrated that differential drivers and their effects on the interactions between soil C and N mineralization at different soil depths should be considered for more accurate prediction of soil C and N dynamics under land-use changes.

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农田使用对土壤微生物群落与农业生态系统功能之间联系的影响取决于深度

土壤碳（C）和氮（N）矿化率是农田生态系统功能的重要指标。然而，人们对农业土地利用对不同土壤深度土壤碳和氮矿化之间相互作用的影响知之甚少，尤其是在热带地区。本文将中国热带地区的龙眼果园（LO）改造为常规茶园（CTP）和有机茶园（OTP），并评估了真菌和细菌群落对这些变化的响应。评估了土地利用变化对微生物群落特征、酶活性、氮和碳矿化率的影响。结果发现，在表层土壤中，LO 和 OTP 的氮和碳矿化率比 CTP 快。然而，在地下土壤中，与 CTP 相比，LO 和 OTP 的 C 矿化率更快，N 矿化率更慢。结构方程模型显示，pH 值和 C/N 是影响表层土壤氮和碳矿化率的最关键因素。相比之下，土壤细菌和真菌群落结构是地表下土壤碳和氮矿化的主要驱动因素。虽然表层土壤的土壤碳和净氮矿化率呈正相关，但在地下土壤中却看不到这种情况。总之，这项研究表明，为了更准确地预测土地利用变化下的土壤碳和氮动态，应考虑不同土壤深度的不同驱动因素及其对土壤碳和氮矿化之间相互作用的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Agriculture, Ecosystems & Environment 环境科学-环境科学

CiteScore

11.70

自引率

9.10%

发文量

392

审稿时长

26 days

期刊介绍： Agriculture, Ecosystems and Environment publishes scientific articles dealing with the interface between agroecosystems and the natural environment, specifically how agriculture influences the environment and how changes in that environment impact agroecosystems. Preference is given to papers from experimental and observational research at the field, system or landscape level, from studies that enhance our understanding of processes using data-based biophysical modelling, and papers that bridge scientific disciplines and integrate knowledge. All papers should be placed in an international or wide comparative context.