摘要
为探究不同轮耕模式对豫北农田土壤固碳及碳库管理指数的影响,本研究在豫北潮土区,于2016—2020年小麦季以3年为一个轮耕周期,设置5个处理:连续旋耕(RT-RT-RT)、深耕-旋耕-旋耕(DT-RT-RT)、深耕-旋耕-浅旋耕(DT-RT-SRT)、深耕-浅旋耕-浅旋耕(DT-SRT-SRT)、深耕-浅旋耕-旋耕(DT-SRT-RT)。测定并分析了2019年和2020年0~50 cm土层土壤容重、总有机碳(SOC)、易氧化有机碳(LOC)、稳态有机碳(NLOC)含量及有机碳储量和碳库管理指数。结果表明,各轮耕处理均能降低0~40 cm土层的土壤容重。在0~20 cm土层, DT-SRT-SRT处理的SOC、LOC和NLOC含量最高,分别为11.54 g·kg^(-1)、3.31 g·kg^(-1)和8.30 g·kg^(-1);而相较于RT-RT-RT处理,DT-SRT-RT处理显著增加10~40 cm土层SOC、LOC和NLOC含量;且各轮耕处理降低了LOC/SOC,但提高了NLOC/SOC,尤其是20~40 cm土层,最高增长7.5%。试验期内,各轮耕处理均能提高0~40 cm土层土壤有机碳储量, 2019年0~30 cm土层, DT-SRT-SRT处理有机碳储量最高,为36.64 Mg·hm^(-2);但在2019和2020年, 0~40 cm土层, DT-SRT-RT处理的有机碳储量均为最高,与RT-RT-RT处理相比分别提高12.8%和9.7%。随耕作年限的不同土壤碳库管理指数(CPMI)呈现出一定的差异, 2019年, DT-SRT-RT处理显著降低了0~40 cm土层中的活度指数,CPMI相对较低,最高降幅为4.3%。而2020年, DT-SRT-RT处理显著提高了0~40 cm土层的碳库指数和CPMI,CPMI最高为108.5。综合以上分析,深耕-条旋耕-旋耕处理显著降低了土壤容重,提高SOC、LOC和NLOC,增加0~40 cm土层有机碳储量,具有明显的固碳效应。
To explore the effects of different tillage rotation modes on soil carbon sequestration and carbon pool management index of farmland in northern Henan, a field experiment comprising five treatments with different tillage modes was carried out during wheat seasons from 2016 to 2020 in fluvo-aquic soil in northern Henan. The treatments were: 1) continuous rotary tillage(RT-RT-RT, CK);2) deep tillage-rotary tillage-rotary tillage(DT-RT-RT);3) deep tillage-rotary tillage-shallow rotary tillage(DT-RT-SRT);4) deep tillage-shallow rotary tillage-shallow rotary tillage(DT-SRT-SRT);5) deep tillage-shallow rotary tillage-rotary tillage(DT-SRT-RT).Soil bulk density, soil organic carbon(SOC), liable organic carbon(LOC), non-liable organic carbon(NLOC), organic carbon storage, and carbon pool management index(CPMI) in 0–50 cm soil layers were measured and analyzed. The results showed that the soil bulk density in the 0–40 cm soil layer decreased under rotation tillage treatments. In the 0-20 cm soil layer, the SOC, LOC, and NLOC contents, with values of 11.54 g·kg^(-1), 3.31 g·kg^(-1), 8.30 g·kg^(-1), respectively, were the highest under DT-SRT-SRT and were significantly higher than those under RT-RT-RT. Compared with those under RT-RT-RT, the SOC, LOC and NLOC contents in the10-40 cm soil layer were significantly higher under DT-SRT-RT. The rotation tillage treatments reduced LOC/SOC but increased NLOC/SOC, especially in the 20-40 cm soil layer;the highest increment was 7.5%. During the experimental period, each rotation tillage treatment increased the soil organic carbon storage in the 0-40 cm soil layer. In 2019, the organic carbon storage in the 0-30cm layer was highest under DT-SRT-SRT(36.64 Mg·hm^(-2)). However, the organic carbon storage in the 0-40 cm soil layer, which increased by 12.8% and 9.7%, respectively, during 2019 and 2020 compared with that under RT-RT-RT, and was highest under DTSRT-RT. In 2019, the activity index of carbon pool in the 0-40 cm soil layer under DT-SRT-RT was reduced. The CPMI was rel
作者
朱长伟
陈琛
牛润芝
李洋
姜桂英
杨锦
申凤敏
刘芳
刘世亮
ZHU Changwei;CHEN Chen;NIU Runzhi;LI Yang;JIANG Guiying;YANG Jin;SHEN Fengmin;LIU Fang;LIU Shiliang(College of Resources and Environment,Henan Agricultural University,Zhengzhou 450002,China)
出处
《中国生态农业学报（中英文）》
CAS
CSCD
北大核心
2022年第4期671-682,共12页
Chinese Journal of Eco-Agriculture
基金
国家重点研发计划重点专项项目(2021YFD1700900)
国家自然科学基金项目(41401327)
河南省重点研发与推广专项项目(192102110161)
河南省高等学校重点科研项目(20A210024)资助。
关键词
轮耕模式
潮土
土壤有机碳储量
土壤碳库管理指数
秸秆还田
Rotation tillage mode
Fluvo-aquic soil
Soil organic carbon storage
Soil carbon pool management index
Straw returning
