The relationship between soil microbial activity and microbial biomass, soil structure and grassland management
The relationship between soil microbial activity and microbial biomass, soil structure and grassland management
复制标题
DOI：
10.1016/j.still.2014.07.005
复制
发表时间：
2015-03-01
影响因子：
6.5
通讯作者：
Holden, Nicholas M.
中科院分区：
文献类型：
--
作者：
Cui, Junfang;Holden, Nicholas M.
土壤结构如何与微生物生物量相互作用的问题知之甚少。大多数关于土壤结构和土壤微生物活性的研究都是基于间接指示土壤结构的土壤性质的实验室测量，很少使用直接的实地数据。本研究采用土壤结构视觉评价法（VESS）原位评价了不同草地管理方式下土壤结构质量，并测定了与土壤碳（C）和氮（N）循环相关的微生物活性，以评估土壤结构与微生物活性是否相关。土壤结构（以Sq值表示）与土壤呼吸和酶活性均呈极显著负相关，表明土壤结构质量越差，微生物活性越低。频繁补种和氮肥施用与酶活性呈正相关，表明这些管理活动，计划提高产量，可以有积极的影响，以及对土壤的碳输入。在较高的载畜率下，土壤酶活性的增加可能是由动物践踏引起的土壤C向深层的迁移所驱动的。土壤结构与碳、微生物活性与碳之间的相关性较强，说明管理对土壤碳具有双向的“桥梁”作用。良好的结构为土壤有机质分解提供了最佳的物理条件，为土壤微生物提供了食物来源，以微生物活动为主的土壤碳过程有利于土壤结构的形成。然而，需要进一步的研究来更好地理解这种双向C“桥”功能。(C)2014爱思唯尔有限公司版权所有。
The question of how soil structure interacts with microbial biomass is poorly understood. Most research on soil structure and soil microbial activity has been based on laboratory measurements of soil properties that are indirectly indicative of soil structure, and very few have used direct field data. This study assessed soil structural quality in situ by visual evaluation of soil structure method (VESS) and measured microbial activity related to soil carbon (C) and nitrogen (N) cycles under various grassland management to assess whether soil structure is correlated with microbial activity, both of which are regulated by agricultural management. Soil structure (indicated by Sq score) was strongly negatively correlated with both soil respiration and enzyme activity, indicating a decline in microbial activity with poorer soil structural quality. Both frequent reseeding and N fertilizer application were positively correlated with enzyme activity indicating that these management activities, planned to improve yield can have positive impacts on C input to the soil as well. The increase in enzyme activity under higher stocking rate was perhaps driven by soil C re-location to depth by animal trampling. The strong correlation between soil structure and C and microbial activity and C indicated a two-way 'bridge' function of soil C regulated by management. Good structure is supportive of soil organic matter decomposition by supplying optimal physical conditions, which supply food source for soil microbes and the soil processes of soil C dominated by microbial activity are beneficial for soil structure formation. However, further research is required to better understand this two-way C 'bridge' function. (C) 2014 Elsevier B.V. All rights reserved.