Effects of Long-term Subsoiling Combined with Straw Returning on Carbon Sequestration Capacity and Inorganic Stability Mechanism of Soil Aggregates

doi:10.11924/j.issn.1000-6850.casb2023-0747

Abstract

Abstract:

The effects of long-term tillage and straw returning on soil aggregate carbon sequestration capacity was analyzed, the inorganic stability mechanism of Fe and Al oxides in aggregates was explored, and theoretical basis for selecting appropriate farmland management measures was provided. Four treatments were set up in the experiment including subsoiling with straw returning (ST_s), subsoiling without straw returning (ST₀), no-tillage with straw returning (NT_s) and no-tillage without straw returning (NT₀). The water-stable aggregates were measured by wet sieve method. Soil organic carbon and aggregate organic carbon were measured by TOC analyzer. Various forms of iron aluminum oxides were measured by colorimetric method. The effect of four treatments on each index was analyzed and compared. The results showed that compared with subsoiling, the mean weight diameter and geometric mean diameter in no-tillage were increased by 18.6% and 6.8%, respectively. Compared with no-tillage, the soil organic carbon of >2, 1-2, 0.5-1, 0.25-0.5 and 0.106-0.25 mm in subsoiling was increased by 27.9%, 28.8%, 16.9%, 11.0% and 5.5%, respectively. The total carbon storage of subsoiling was increased by 11% than that of no-tillage. The total carbon storage of straw returning increased by 11% than that of no straw returning. The content of free iron oxide in the surface soil was increased by 50% than that of other treatments. Compared with no-tillage, the amorphous iron and complex aluminum in subsoiling were increased by 43% and 65%, respectively. Therefore, long-term subsoiling combined with straw returning could effectively improve soil carbon sequestration capacity and inorganic stability of aggregates.

Key words: subsoiling, straw returning, aggregate, carbon reserve, iron and aluminium oxide, soil carbon sequestration capacity, inorganic stability of aggregates

WANG Ning, ZHANG Renzheng, LIU Zhen, LV Jinling, SHEN Ying, YANG Qian, LI Geng, NING Tangyuan. Effects of Long-term Subsoiling Combined with Straw Returning on Carbon Sequestration Capacity and Inorganic Stability Mechanism of Soil Aggregates[J]. Chinese Agricultural Science Bulletin, 2024, 40(28): 83-93.

Figures/Tables 8

References 37

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处理	0~10 cm	10~20 cm	20~30 cm	30~40 cm	40~50 cm	50~60 cm	60~70 cm	70~80 cm	80~90 cm	90~100 cm	合计
ST_s	28.82b	19.90a	10.46c	7.66c	7.40b	13.30a	5.45b	5.22a	4.19b	2.98b	105.39
ST₀	31.73a	19.56a	11.28b	8.35b	7.25b	6.05d	5.24b	5.51a	4.10b	2.97b	102.05
NT_s	23.02c	11.23b	12.58a	12.12a	14.25a	7.77c	6.40a	5.09a	5.10a	4.56a	102.12
NT₀	21.64c	10.61c	9.28d	8.69b	7.98b	9.07b	5.51b	5.89a	4.17b	2.46b	85.31

处理	0~10 cm	10~20 cm	20~30 cm	30~40 cm	40~50 cm	50~60 cm	60~70 cm	70~80 cm	80~90 cm	90~100 cm	合计
ST_s	28.82b	19.90a	10.46c	7.66c	7.40b	13.30a	5.45b	5.22a	4.19b	2.98b	105.39
ST₀	31.73a	19.56a	11.28b	8.35b	7.25b	6.05d	5.24b	5.51a	4.10b	2.97b	102.05
NT_s	23.02c	11.23b	12.58a	12.12a	14.25a	7.77c	6.40a	5.09a	5.10a	4.56a	102.12
NT₀	21.64c	10.61c	9.28d	8.69b	7.98b	9.07b	5.51b	5.89a	4.17b	2.46b	85.31