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Organic fertilization promotes crop productivity through changes in soil aggregation

文献类型： 外文期刊

作者： Tian, Shanyi 1 ; Zhu, Baijing 1 ; Yin, Rui 7 ; Wang, Mingwei 1 ; Jiang, Yuji 6 ; Zhang, Chongzhe 1 ; Li, Daming 5 ; Chen, Xiaoyun 1 ; Kardol, Paul 4 ; Liu, Manqiang 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Resources & Environm Sci, Soil Ecol Lab, Nanjing 210095, Peoples R China

2.Jiangsu Collaborat Innovat Ctr Solid Organ Waste, Nanjing 210095, Peoples R China

3.Key Lab Biol Interact & Crop Hlth, Nanjing 210095, Peoples R China

4.Swedish Univ Agr Sci, Dept Forest Ecol & Management, S-90183 Umea, Sweden

5.Jiangxi Inst Red Soil, Nanchang 331717, Peoples R China

6.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

7.UFZ Helmholtz Ctr Environm Res, Dept Community Ecol, Theodor Lieder Str 4, D-06110 Halle, Saale, Germany

关键词： Soil aggregates; Fertilization regimes; Microbial community; Nutrient stoichiometry; Soil functioning; Agriculture sustainability

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：8.546； 五年影响因子：9.956 ）

ISSN： 0038-0717

年卷期： 2022 年 165 卷

页码：

收录情况： SCI

摘要： Soil aggregates are the key functional units of soil ecosystems which are essential to biogeochemical cycling and plant growth. However, it remains unclear how fertilization regimes influence soil aggregation, associated resources, and microbial distribution among aggregates, as well as the potential subsequent impacts for other abiotic and biotic processes. For this, a long-term maize cropping field experiment was conducted in the subtropical region of China under four fertilization treatments: no fertilizer, chemical fertilization, organic fertilization, and chemical plus organic fertilization. Additionally, we classified soil aggregates into large macro aggregates (>2 mm), small macro-aggregates (0.25-2 mm), and micro-aggregates (<0.25 mm) and compared soil nutrients, enzyme activities, and microbial communities of each aggregate fraction and bulk soil as well as crop productivity and plant carbon (C), nitrogen (N), and phosphorus (P). Results showed that long-term organic fertilization (1) increased soil C, N, and P contents within macro-aggregates, while increased bacterial and fungal biomass within all three aggregate size fractions, (2) increased N-acquiring enzyme activity, C:P, and N:P enzyme ratios but decreased phosphatase activity and C:N enzyme ratio regardless of aggregate fractions, and (3) promoted crop productivity but decreased plant C:N, C:P, and N:P ratios compared with chemical fertilization. Additionally, the fungi:bacteria ratio and phosphatase activity decreased, but the gram-positive to gram-negative bacterial ratio, C-acquiring enzyme activity, C:N and C:P enzyme ratios increased with decreasing aggregate size. The partial least squares models confirmed that macro-aggregates had strong effects on crop performance while micro-aggregates was the main determinant of microbial community. Taken together, long-term organic fertilization promotes soil functioning and crop productivity via increasing the proportion of soil macro-aggregates.

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