| Effects of different returning amount of rape on nematode community in saline alkali soil in Xinjiang |
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| DOI：10.7606/j.issn.1000-7601.2023.01.29 |
| Key Words: rape green manure returning amount soil nematode diversity |
| Author Name | Affiliation | | YANG Tao | Shihezi University, Xinjiang Production and Construction Group Key Laboratory ofOasis Ecoagriculture, Shihezi, Xinjiang 832003, China | | CHEN Hong | Shihezi University, Xinjiang Production and Construction Group Key Laboratory ofOasis Ecoagriculture, Shihezi, Xinjiang 832003, China | | ZHANG Fenghua | Shihezi University, Xinjiang Production and Construction Group Key Laboratory ofOasis Ecoagriculture, Shihezi, Xinjiang 832003, China |
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| Abstract: |
| Rape has wide adaptability and strong stress resistance. Returning green fertilizer to the field can improve the soil environment and is conducive to the sustainable development of soil ecosystem. In this study, rape was treated with different returning amounts (CK: no returning; T1: 21 000 kg·hm-2; T2: 42 000 kg·hm-2; T3: 84 000 kg·hm-2). High throughput sequencing was used to study the response of soil nematode community to rape returning. The results showed that: (1) Compared with CK, different returning amounts reduced soil pH by 4.19%~6.59%, total soil salt by 4.07%~6.86%, and soil bulk density by 9.68%~12.90%. The content of soil organic matter in T2 treatment increased by 27.42% compared with CK, and the contents of alkali hydrolysable nitrogen and available potassium in T3 treatment increased by 35.46% and 11.12% compared with CK. (2) 24 species, 19 genera, 13 families, 3 classes, 3 orders of nematoda were detected from all soil samples. The dominant trophic groups of each treatment were bacterial eating nematodes. With the increase of returning amount, the relative abundance of bacteria\|eating nematodes and predatory omnivorous nematodes gradually decreased, while the relative abundances of fungal\|eating nematodes and plant\|parasitic nematodes gradually increased. Compared with CK, the soil nematode richness index decreased, the diversity index increased, and the enrichment index EI and structure index SI decreased. (3) Soil organic matter and available potassium were the main soil environmental factors affecting the change of nematode community structure. In conclusion, rape returning improved soil structure, enhanced soil comprehensive fertility, increased the diversity and complexity of nematode community, and made the ecosystem tend to be stable. The amount of rape returning should be 84 000 kg·hm-2. |
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