| Effects of long\|term fertilization on soil nematode community of wheat field in Weibei dryland, China |
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| DOI：10.7606/j.issn.1000-7601.2022.05.26 |
| Key Words: nematodes community structure wheat field long\|term fertilization physicochemical properties of soil Weibei dryland |
| Author Name | Affiliation | | YANG Panpan | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
University of Chinese Academy of Sciences, Beijing 100049, China | | HUANG Jinghua | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Xinyue | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China； College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100,China | | CHEN Jing | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China； College of Forestry, Northwest A & F University, Yangling, Shaanxi 712100,China | | ZHAO Shiwei | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
University of Chinese Academy of Sciences, Beijing 100049, China；State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| To explore the effects of long\|term fertilization on the characteristics of soil nematode communities of wheat field in Weibei dryland, a long\|term positioning experiment (1984-2018) of the National Agricultural Ecological Experimental Station in Changwu County, Shaanxi Province was conducted.Different fertilization treatments, including bare land (L), as well as wheat fields without fertilizer (CK), nitrogen and phosphorus fertilizers (NP), organic fertilizer (M), nitrogen and phosphorus combined with organic fertilizer (MNP) were set up to investigate the abundance, composition, structure and ecological indices of soil nematode communities in farmlands. The relationships of nematode communities with soil physicochemical properties were also analyzed. The results showed that: (1) Soil nematode abundance in wheat fields were significantly higher than that of bare land. CK, M and MNP treatments increased the abundance of soil nematodes by 31.63%~56.20%, compared with NP treatment. (2) Fertilizer treatments mitigated the decrease in the relative abundance of bacterial\|feeding nematodes (i.e.Cephalobus). The relative abundance of herbivorous nematodes decreased significantly in the treatment of organic fertilizer (M)treatment. At the same time, the relative abundance of omnivorous/predatory nematodes in M and MNP treatments increased by 18.4% and 8.24%, compared with CK, indicating the promotional effect of organic fertilizer on omnivorous/predatory nematodes. (3) Under long\|term fertilization, soil nematode Shannon diversity index (H) and Wasilewska index (WI) were 1.80~2.19 and 0.36~0.68, respectively, which were lower than those in bare land (H=2.36; WI=1.57). However, compared with other treatments (L, CK and NP), M and MNP treatments obviously increased the maturity index (MI) and structure index (SI) of nematode community, indicating that organic fertilizer application helped maintain the structure complexity and stability of soil food web. (4) Changes in soil total nitrogen, organic carbon, microbial biomass carbon and nitrogen and dissolved organic carbon under different fertilization treatments were important environmental factors affecting soil nematode abundance and community pattern. |
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