Contrasting mechanisms of nutrient mobilization in rhizosphere hotspots driven by straw and biochar amendment

根际 生物炭 修正案 稻草 相对物种丰度 厚壁菌 矿化(土壤科学) 有机质 微生物种群生物学 放线菌门 化学 农学 营养物 生物 植物 土壤水分 生态学 丰度(生态学) 细菌 有机化学 遗传学 法学 16S核糖体RNA 热解 政治学
作者
Wen‐Hui Shang,Bahar S. Razavi,Shuihong Yao,Cunkang Hao,Yakov Kuzyakov,Еvgenia Blagodatskaya,Jing Tian
出处
期刊:Soil Biology & Biochemistry [Elsevier BV]
卷期号:187: 109212-109212 被引量:27
标识
DOI:10.1016/j.soilbio.2023.109212
摘要

Straw return strategies are widely used green management practices that can alter soil organic matter transformation and dynamics through changes in microbial community structure and functions. How the exogenous input of organic materials of contrasting qualities affects the composition of dominant taxa, growth, and microbial functional properties related to nutrient acquisition in space remains unclear. In this study, we investigated the hotsopts and kinetics of C- and N-acquiring hydrolases, microbial growth, and bacterial community structure in maize rhizosphere hotspots after the addition of straw and straw-derived biochar using soil zymography, substrate-induced respiration and high-throughput sequencing. Compared with no amendment and maize straw-derived biochar, straw addition increased the growing biomass and microbial specific growth rate by 1.2–1.6 and 1.7–2.0-fold, respectively, indicating the relative dominance of fast-growing r-strategists. This corresponds to an increased relative abundance of the keystone taxa Firmicutes and their gene copies encoding β-1,4-glucosidase (BG) and β-N-acetylglucosaminidase (NAG). The potential activity and affinity (Vmax and Km) of BG increased 2.2 and 1.8 times, respectively, and those of NAG increased 4.0 and 2.0 times, respectively. In contrast, the relative abundance of Actinobacteria belonging to K-strategists increased in the biochar-amended soil. This resulted in slower growth and retarded enzymatic activity than the straw return treatment. Biochar enhanced the root biomass by 31% and increased the rhizosphere hotspot extents of BG and NAG by 26% and 47%, respectively. The highest robustness and modularity of the co-occurrence network indicated a more stable network with biochar input. In summary, the addition of straw accelerated rhizosphere nutrient cycling by triggering microbial growth, especially fast-growth r-strategists (Firmicutes), and synthesizing a large number of enzymes. In contrast, the addition of biochar increased rhizosphere nutrient mobilization by expanding the extent of rhizosphere hotspots to mobilize nutrients from a larger soil volume. This suggests that there are different strategies for nutrient mobilization in the rhizosphere with contrasting exogenous C addition.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
Yep0672发布了新的文献求助10
1秒前
冷艳如柏完成签到,获得积分10
1秒前
红莲墨生发布了新的文献求助10
1秒前
研究僧发布了新的文献求助10
1秒前
顾矜应助无恙采纳,获得10
1秒前
QQQ发布了新的文献求助10
1秒前
123发布了新的文献求助10
2秒前
Cc完成签到 ,获得积分10
3秒前
coco完成签到,获得积分10
3秒前
5秒前
6秒前
hywei发布了新的文献求助10
6秒前
tttt发布了新的文献求助10
6秒前
柯尔丝发布了新的文献求助100
8秒前
林林发布了新的文献求助10
8秒前
SciGPT应助欣慰的乌冬面采纳,获得10
9秒前
10秒前
11秒前
dong应助机灵的茹妖采纳,获得10
11秒前
zlg完成签到 ,获得积分10
11秒前
lijiaxin应助Leoling采纳,获得10
11秒前
12秒前
阿拉香香发布了新的文献求助10
13秒前
14秒前
星禾吾发布了新的文献求助10
14秒前
猫猫熊完成签到,获得积分10
15秒前
星辰大海应助意未清采纳,获得10
16秒前
16秒前
16秒前
1MENINA1完成签到 ,获得积分10
17秒前
17秒前
17秒前
123完成签到,获得积分10
17秒前
19秒前
丰富的硬币完成签到,获得积分10
19秒前
nobody完成签到,获得积分10
20秒前
竹萱发布了新的文献求助10
21秒前
21秒前
22秒前
无情的匪发布了新的文献求助10
22秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 700
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
Indomethacinのヒトにおける経皮吸収 400
Effective Learning and Mental Wellbeing 400
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3975953
求助须知:如何正确求助?哪些是违规求助? 3520269
关于积分的说明 11201866
捐赠科研通 3256738
什么是DOI,文献DOI怎么找? 1798436
邀请新用户注册赠送积分活动 877578
科研通“疑难数据库(出版商)”最低求助积分说明 806464