| Effects of subsoiling and straw returning on soil aggregates of irrigated sierozem farmland |
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| DOI：10.7606/j.issn.1000-7601.2020.02.11 |
| Key Words: soil aggregate subsoiling straw returning irrigated sierozem soil |
| Author Name | Affiliation | | WEN Meijuan | Institute of Soil Fertilizer and Water\|saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | YANG Sicun | Institute of Soil Fertilizer and Water\|saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | WANG Chengbao | Institute of Soil Fertilizer and Water\|saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | HUO Lin | Institute of Soil Fertilizer and Water\|saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China | | JIANG Wanli | Institute of Soil Fertilizer and Water\|saving Agriculture, Gansu Academy of Agriculture Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Three treatments were set up in 2015-2017 including traditional rotary tillage without straw returning (RT), subsoiling 35 cm without straw returning (ST), and subsoiling 35 cm straw returning (STS).Samples were collected from 0~40 cm soil layer and dry screening and wet sieve methodsused for studying the composition of soil aggregates, the number of aggregates > 0.25 mm (R0.25), the average weight diameter (MWD), the geometric mean diameter (GMD), the aggregate destruction rate (PAD), the aggregate instability coefficient (ELT), and the fractal dimension (D). The results showed that comparing with RT and ST, STS promoted the formation and stability of aggregates in 0~40 cm soil layer, and the number and size of aggregates were significantly affected by subsoiling and straw returning (P<0.05), which promoted the renewal and transformation of aggregates with different particle size. In 0~40 cm soil layer, with dry sieving method, DR0.25 (＞0.25 mm mechanical stability aggregate content), MWD, and GMD of STS increased by 3.0%, 9.5%, and 15.5% and the fractal dimension decreased by 4.5% compared with RT. With wet sieving method, WR0.25 (＞0.25 mm water stable aggregate content), MWD, and GMD of STS increased by 45.2%, 12.0%, and 9.1% comparing with RT, and the fractal dimension decreased by 1.1% compared to RT. Meanwhile, in stratification, the amplification of STS in 0~10 cm soil layer was the largest than that of RT, with DR0.25, MWD, and GMD was 8.6%, 18.0%, and 25.3%, respectively, in dry sieving method. Wet sieving was the same as the dry sieve, and in 0~10 cm soil layer, the amplification of STS of DR0.25, MWD, and GMD increased 67.7%, 25.0%, and 12.5% comparing to that of RT. In addition, STS significantly decreased PAD and ELT compared ST and RT in 0~40 cm soil layer, PAD decreased by 8.6% and 2.4%, ELT decreased by 7.0% and 15%, respectively. Overall,STS promoted the increase of content and stability of soil aggregate, and also promoted the formation and stability of soil structure. |
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