| Response of composition of soil aggregates and distribution of organic carbon and total nitrogen to straw returning in an oasis area |
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| DOI：10.7606/j.issn.1000-7601.2019.03.18 |
| Key Words: no-tillage straw returning soil aggregates organic carbon total nitrogen oasis farmland |
| Author Name | Affiliation | | YIN Wen | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | GUO Yao | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHEN Gui-ping | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | FENG Fu-xue | College of Water Conservancy and Hydropower Engineering, Gansu Agricultural University, Lanzhou Gansu, 730070, China | | ZHAO Cai | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YU Ai-zhong | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | FAN Zhi-long | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HU Fa-long | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHAI Qiang | Gansu Provincial Key Laboratory of Arid Land Crop Science / College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A field experiment was carried out in arid irrigation regions to determine the effects of different wheat straw retention approaches on distribution characteristics of organic carbon and total nitrogen of soil aggregates in farmland, including (i) no tillage with 25 to 30 cm high straw standing (NTSS); (ii) no tillage with 25 to 30 cm high straw covering (NTS); (iii) conventional tillage with 25 to 30 cm high straw incorporation (TIS); and (iv) conventional tillage without straw retention (CT, the control). The results showed that no-tillage with straw retention (i.e., NTSS, NTS) had higher content of soil aggregates ≥ 0.25 mm than that of CT treatment, NTSS increased the content of soil aggregates ≥ 0.25 mm by 5.4%, 13.3%, and 11.1% in 0~10 cm, 10~20 cm, 20~30 cm soil depth, respectively and NTS increased it by 12.5%, 14.1%, and 19.2% in three soil depths, respectively. In particular, NTS treatment had the greatest effect on increasing content of the soil aggregates. NTSS and NTS treatments increased the average weight diameter (MWD) of soil aggregates by 6.7% and 7.6% in 0~10 cm and by 11.6% and 8.1% in 20~30 cm soil, respectively, in comparison to CT. NTS treatment had the highest increasing effect on the MWD. NTSS and NTS treatments improved soil organic carbon and total nitrogen contents; NTSS improved soil organic carbon by 8.1%, 7.4%, and 7.8%, improved total nitrogen by 14.6%, 14.5%, and 16.2% in 0~10 cm, 10~20 cm, and 20~30 cm soil, respectively. Similarly, NTS improved soil organic carbon by 13.3%, 11.4%, and 12.8%, improved total nitrogen by 17.9%, 17.9%, and 20.5% in three soil depths, respectively; and NTS treatment had the highest increasing percentage on soil organic carbon and total nitrogen. The contents of soil organic carbon and total nitrogen in different sized soil aggregates were decreased with increasing soil depth. The contents of soil organic carbon and total nitrogen of soil aggregates were increased with decreasing size. In all, NTS treatment had higher contents of soil organic carbon and total nitrogen in various soil depths and sizes. Therefore, our results indicated that no-tillage with 25 to 30 cm height of straw covering is recommended as the feasible farming method to enhance the formation of soil aggregates and improve the contents of soil organic carbon and total nitrogen in the arid oasis region. |
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