Particle size is an important factor influencing the effects of biochar return to woodland soils: An evaluation from the perspective of sapling growth and soil microbial carbon processes

被引：0

作者：

Gao, Xiaoyu ^{[1
]}

Liu, Haoting ^{[1
]}

Mei, Wenxuan ^{[1
]}

Zhang, Wenwen ^{[3
]}

Dong, Haoyu ^{[1
]}

Fu, Xiaohua ^{[1
]}

Xie, Mengdi ^{[4
]}

Han, Yujie ^{[5
]}

Wang, Lei ^{[1
,2
]}

机构：

[1] Tongji Univ, Coll Environm Sci & Engn, Key Lab Yangtze River Water Environm, Minist Educ, Shanghai 200092, Peoples R China

[2] Xinjiang Univ, Coll Civil Engn & Architecture, Urumqi 830046, Xinjiang, Peoples R China

[3] Shanghai Forestry Gen Stn, Shanghai 200040, Peoples R China

[4] Chengdu Univ Technol, Coll Ecol & Environm, Chengdu 610059, Sichuan, Peoples R China

[5] Shanghai Acad Landscape Architecture Sci & Plannin, Shanghai 200030, Peoples R China

来源：

JOURNAL OF ENVIRONMENTAL MANAGEMENT | 2024年 / 371卷

关键词：

Biochar from forest waste; Particle size; Sapling growth; Microbial carbon processes; COMMUNITY STRUCTURE; ORGANIC-MATTER; GREENHOUSE-GAS; AMENDMENT; MECHANISMS; QUALITY; BIOMASS;

D O I：

10.1016/j.jenvman.2024.123272

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Biochar can increase ecosystem carbon sequestration by promoting plant growth and stabilizing soil organic carbon (SOC). Biochar produced from forest waste typically varies in particle size and is frequently applied directly for soil enhancement without pulverization. The effects of different biochar particle sizes on sapling growth, woodland soil properties and microbial carbon processes are unclear. This study used field experiments to compare the effects of different biochar particle sizes on sapling growth and microbial metabolic entropy (qCO2). The impacting mechanisms were explored by examining soil physicochemical properties, enzyme activity, and microbial community structure. The application of forest waste (FW) and small particle biochar (SPBC, particle size<2 mm) did not significantly affect sapling growth. Conversely, middle particle biochar (MPBC, particle size 2-10 mm) and large particle biochar (LPBC, particle size>10 mm) reduced sapling biomass by 20.76% and 38.87%, respectively, compared to SPBC. MPBC and LPBC applications resulted in soil nutrient loss (total nitrogen and available phosphorus), inhibiting sapling growth. After 167 days, qCO2 rankings were as follows: FW (30.37 f 5.18) (P<0.05)> LPBC (20.91 f 3.62) > CK (16.21 f 2.71) > MPBC (15.99 f 3.54) > SPBC (7.8 f 0.80) (P < 0.05). The rankings of organic carbon retention rates rankings were as follows: SPBC (85.14%) > LPBC (70.35%) > FW (67.31%) > CK (54.53%) > MPBC (51.96%). SPBC increased biochar-soilmicrobe interactions, raised the relative proportion of k/r-strategy bacteria, reduced extracellular cellulase activity thus inhibit qCO2. In conclusion, small particle biochar (<2 mm), compared to larger-particle biochar, improves SOC sequestration without negatively affecting sapling growth. Therefore, particle size should be considered as a management indicator for biochar applications in artificial forest practices.

引用

页数：9