Effects of slope aspect and tillage type on soil microbial biomass and its stoichiometric ratios in karst trough valley

IF 5.7 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2025-06-12 DOI:10.1016/j.catena.2025.109235

Xiaohong Tan , Lisha Jiang , Wuyi Li , Yuanyue Xia , Xin Cheng , Xiuying Xu , Fengling Gan , Youjin Yan , Yuchuan Fan , Junbing Pu

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Abstract

Soil microbial biomass and its stoichiometric ratios are key indicators of soil quality, driving soil nutrient cycling. Microbial Biomass Carbon (MBC), Microbial Biomass Nitrogen (MBN), Microbial Biomass Phosphorus (MBP) and its stoichiometric ratios is linked to slope aspects and tillage type- related changes, but little is regarded about how slope aspects and tillage types influence soil microbial biomass and its stoichiometric ratios in karst trough valley with severe rocky desertification and complex geological structures. Therefore, our study examined two slope aspects (sunny and shady slopes) and two tillage types (tillage lands and abandoned farmlands) to assess their impacts on soil microbial biomass and its stoichiometric ratios in karst trough valley. The results revealed that the Natural moisture Content (NC), Organic Carbon (OC), Total Nitrogen (TN), C:P, and N:P ratios were lower on sunny slope than on shady slope. Moreover, we observed that the MBC, MBP, and MB_N:P ratios on sunny slope were significantly lower than on shady slope (4.87%, 17.09%, and 79.94%, respectively). Meanwhile, the MBC, MB_C:P, and MB_N:P ratios in abandoned farmlands were greater than those in tillage lands. Additionally, the results of the Pearson correlation analysis and path analysis indicated that the C:P and N:P ratios are pivotal factors influencing microbial biomass and its stoichiometric ratios. Overall, our research revealed that slope aspect and tillage type are key factors influencing the cyclic response of soil microbial biomass. This study provides valuable insights into the effective mitigation of rocky desertification and the enhancement of land quality in karst trough valley.

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坡向和耕作方式对岩溶槽谷土壤微生物量及其化学计量比的影响

土壤微生物量及其化学计量比是土壤质量的关键指标，驱动土壤养分循环。微生物生物量碳（MBC）、微生物生物量氮（MBN）、微生物生物量磷（MBP）及其化学计量比与坡向和耕作方式相关的变化有关，但在石漠化严重、地质结构复杂的喀斯特槽谷，坡向和耕作方式对土壤微生物生物量及其化学计量比的影响研究较少。因此，本研究采用两种坡面（阳坡和阴坡）和两种耕作方式（耕地和弃耕地）来评估其对喀斯特槽谷土壤微生物生物量及其化学计量比的影响。结果表明：阳坡土壤天然含水量（NC）、有机碳（OC）、全氮（TN）、C:P和N:P比值均低于阴坡；阳坡的MBC、MBP和MBN:P显著低于阴坡（分别为4.87%、17.09%和79.94%）。同时，撂荒耕地的MBC、MBC:P和MBN:P比值均大于耕地。此外，Pearson相关分析和通径分析结果表明，碳磷比和氮磷比是影响微生物生物量及其化学计量比的关键因素。总体而言，坡向和耕作方式是影响土壤微生物生物量循环响应的关键因素。该研究为喀斯特槽谷石漠化的有效治理和土地质量的提高提供了有价值的见解。

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来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.