Assessment of Soil Specific Enzyme Activities in Aggregates Size Fractions: a Case Study from Subtropical Agro-ecosystem

IF 1.4 4区农林科学 Q4 SOIL SCIENCE Eurasian Soil Science Pub Date : 2024-01-31 DOI:10.1134/s1064229323602627

Pallavi Bharti, Anupam Das, Sanjay Kumar, Rajiv Rakshit

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Abstract

Soil enzyme activities are closely associated with soil organic carbon (SOC) or microbial biomass carbon (MBC). High correlation between SOC and MBC masks their individual effects on enzyme activities. Expressing soil enzymes activity relative to soil organic carbon (SOC) or Microbial Biomass Carbon (MBC) would normalize the differences in SOC/MBC. A long term subtropical rice-wheat system was selected to study the variation in soil-specific enzyme activity (per unit SOC and MBC) in soil aggregates under integrated nutrient management. Soil organic carbon, microbial biomass carbon and the enzyme activities like acid phosphatase (ACP), alkaline phosphatase (AKP), dehydrogenase (DHA), fluorescien diacetate hydrolysing capacity (FDA) and urease were measured in three aggregate size fractions viz., >2000, 2000–250 and <250 µm. Integrated nutrient management practices significantly increased the specific enzyme activities expressed in relation to SOC and MBC. Aggregate size fractions of 2000–250 µm size exhibited higher specific enzyme activities, when expressed in terms of SOC. Enzyme activity (per unit MBC) in aggregates also followed the same pattern with an exception to dehydrogenase activity which was almost uniform across all the aggregates size fractions. Aggregates of larger size do not always possess higher enzymes activity; even smaller macroaggregates were able to retain stable extracellular enzyme activity per unit of SOC or MBC. This study opens an alley to express soil enzymatic activities relative to SOC or MBC level in the soils, rather than expressing absolute activities.

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集料粒度分馏中的土壤特异酶活性评估：亚热带农业生态系统案例研究

摘要土壤酶活性与土壤有机碳（SOC）或微生物生物量碳（MBC）密切相关。土壤有机碳和微生物生物量碳之间的高度相关性掩盖了它们各自对酶活性的影响。将土壤酶活性与土壤有机碳（SOC）或微生物生物量碳（MBC）相对比，可以使SOC/MBC的差异正常化。我们选择了一个长期的亚热带水稻-小麦系统来研究综合养分管理下土壤团聚体中特定土壤酶活性（单位 SOC 和 MBC）的变化。研究测量了土壤有机碳、微生物生物量碳以及酸性磷酸酶 (ACP)、碱性磷酸酶 (AKP)、脱氢酶 (DHA)、荧光素二乙酸酯水解能力 (FDA) 和脲酶等酶活性在三种团聚体粒度（即 2000、2000-250 和 250 微米）中的变化。综合养分管理方法大大提高了与 SOC 和 MBC 有关的特定酶活性。以 SOC 表示，粒径为 2000-250 µm 的团聚体具有更高的特定酶活性。聚合体中的酶活性（单位 MBC）也遵循相同的模式，但脱氢酶活性除外，该酶活性在所有聚合体粒度组分中几乎是一致的。较大的聚集体并不总是具有较高的酶活性；即使较小的大聚集体也能保持稳定的细胞外酶活性（单位 SOC 或 MBC）。这项研究开辟了一条途径，可以根据土壤中的 SOC 或 MBC 水平来表达土壤酶活性，而不是表达绝对活性。

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来源期刊

Eurasian Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

35.70%

发文量

137

审稿时长

12-24 weeks

期刊介绍： Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences. Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.