| Soil total organic carbon and its light fractions in response to 14 years of conservation tillage |
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| DOI：10.7606/j.issn.1000-7601.2017.01.02 |
| Key Words: conservation tillage soil organic carbon light fraction organic carbon |
| Author Name | Affiliation | | LIU Jie | Gansu Provincial Laboratory of Aridland Crop Sciences/Faculty of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI ling-ling | Gansu Provincial Laboratory of Aridland Crop Sciences/Faculty of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XIE Jun-hong | Gansu Provincial Laboratory of Aridland Crop Sciences/Faculty of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | DENG Chao-chao | Gansu Provincial Laboratory of Aridland Crop Sciences/Faculty of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | PENG Zheng-kai | Gansu Provincial Laboratory of Aridland Crop Sciences/Faculty of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | Yeboah Stephen | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | Lamptey Shirley | Gansu Provincial Laboratory of Aridland Crop Sciences/Faculty of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The study was carried out on a long-term field experiment set up in 2001 in Dingxi, which is a typical semiarid rainfed agriculture area on the western Loess Plateau. The objective of the experiment was to determine the effect of conventional and conservation tillage practices on soil organic carbon (SOC) and light fraction organic carbon (LFOC) in surface soil of wheat-pea double sequence rotation system. The experiment was laid out in a randomized complete block design with four replications. Treatments included six types of tillage practices; conventional tillage with no straw (T), no-tillage with no straw mulching (NT), conventional tillage with straw incorporation (TS), no-tillage with straw mulching (NTS), conventional tillage with plastic film mulch (TP), no-tillage with plastic mulching (NTP). The main results were as follows: (1) the soil SOC and LFOC content decreased with increasing soil depth; (2) compared with the conservation tillage, no tillage with stubble incorporated (NTS) and tillage with straw incorporation improved soil SOC and LFOC, it has increased by 19.51%, 13.36% and 64.58%, 42.08% before sowing, increased by 28.00%, 18.61% and 85.37%, 77.82% after harvest. However, no-till without straw incorporated (NT) and conventional tillage with plastic film mulch (TP) did not show obvious effect; (3) the SOC content from sowing to harvest exhibited a downward tendency, with the minimum change occurring in NTS and TS; but NT and TP expanded the consumption of SOC during crop growth stage. (4) LFOC was sensitive as an indicator of soil organic carbon. |
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