| The relationship between soil labile organic carbon fractions and the enzyme activities under different tillage measures in the Loess Plateau of central Gansu province |
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| DOI：10.7606/j.issn.1000-7601.2017.01.01 |
| Key Words: tillage methods soil organic carbon soil enzymes soil labile organic carbon fractions |
| Author Name | Affiliation | | ZHANG Ying-ying | Gansu Provincial Key Laboratory of Arid Land Crop Sciences , Lanzhou, Gansu 730070, China
Faculty of Resource and Environment of Gansu Agri-cultural University, Lanzhou, Gansu 730070, China
Gansu Institute of Agricultural Engineering Technology, Wuwei, Gansu 733006, China | | CAI Li-qun | Gansu Provincial Key Laboratory of Arid Land Crop Sciences , Lanzhou, Gansu 730070, China
Faculty of Resource and Environment of Gansu Agri-cultural University, Lanzhou, Gansu 730070, China
Gansu Province agricultural water-saving engineering research center, Lanzhou, Gansu 730070, China | | WU Jun | Gansu Provincial Key Laboratory of Arid Land Crop Sciences , Lanzhou, Gansu 730070, China
Faculty of Resource and Environment of Gansu Agri-cultural University, Lanzhou, Gansu 730070, China | | QI-Peng | Gansu Provincial Key Laboratory of Arid Land Crop Sciences , Lanzhou, Gansu 730070, China
Faculty of Resource and Environment of Gansu Agri-cultural University, Lanzhou, Gansu 730070, China | | LUO Zhu-zhu | Gansu Provincial Key Laboratory of Arid Land Crop Sciences , Lanzhou, Gansu 730070, China
Faculty of Resource and Environment of Gansu Agri-cultural University, Lanzhou, Gansu 730070, China
Gansu Province agricultural water-saving engineering research center, Lanzhou, Gansu 730070, China | | ZHANG Ren-zhi | Gansu Provincial Key Laboratory of Arid Land Crop Sciences , Lanzhou, Gansu 730070, China
Faculty of Resource and Environment of Gansu Agri-cultural University, Lanzhou, Gansu 730070, China
Gansu Province agricultural water-saving engineering research center, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Based on long-term conservation tillage experiments at Dingxi in the rain-fed field of western Loess Plateau in Gansu province, we investigated the effects of four types of tillage methods, including conventional tillage(T), no tillage no stubble retention (NT),no tillage with stubble retention(NTS) conventional tillage with stubble retention(TS), on soil organic carbon, soil labile organic carbon, soil microbial biomass carbon, carbon pool management and four kinds of soil enzymes involved in carbon cycling were invertase, diastase, cellulase and peroxidase. Aanalysis of the relationship between soil organic carbon and labile carbon fractions and soil enzymes showed that compared with T treatment NTS improved soil organic carbon, soil active organic carbon, soil microbial biomass carbon and carbon pool management index,by 16.3%, 28.26%, 41.88%, 37.04%, respectively. Compared with T, NTS, TS, NT improved the soil invertase, diastase, cellulase, peroxidase activities in 0～30 cm depth of soil, invertase activity were increased by 33.84%, 21.59%, 25.15%, diastase activity by 20.90%, 13.43%, 12.69%, cellulase activity by 39.13%, 17.39%, 4.34%, peroxidase activity by 7.81%, 2.08%, 3.65%. Soil invertase, diastase, cellulase, peroxidase and labile organic carbon fractions and carbon pool management index were significantly positive correla-tion. With the increase in invertase activities, it was benefit to increase the concentration of total organic carbon, soil labile organic carbon and soil microbial biomass carbon, and the invertase played a vital role in the accumulating of soil organic carbon pool, soil cellulase has great effect on soil organic carbon and soil labile organic carbon. Peroxidase favourable for the accumulation of total organic carbon. No tillage with straw cover is suitable for the healthy and stable development of the farmland ecosystem in this region as an important way to reduce losses for carbon pool. |
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