Variations in soil fungal communities after continuous fertiliser treatment under the ridge and furrow rainfall harvesting system in a semiarid region of China
Yan Zhang
A B , Qian Ma A B , Yingxin Wang A B , Zhilin Hu A B , Donghua Liu A B , Yanshan Ning A , Zhikuan Jia A B C and Peng Zhang A B C
+ Author Affiliations
- Author Affiliations
A College of Agronomy, Northwest A&F University, Yangling, 712100, Shaanxi, China.
B Key Laboratory of Crop Physi-Ecology and Tillage Science in Northwestern Loess Plateau, Minister of Agriculture, Northwest A&F University, Yangling, 712100, Shaanxi, China.
C Corresponding authors. Email: jiazhk@126.com; pengzhang121@hotmail.com
Soil Research 58(2) 161-173 https://doi.org/10.1071/SR18336
Submitted: 10 November 2018 Accepted: 31 October 2019 Published: 23 December 2019
Abstract
The ridge and furrow rainfall harvesting (RFRH) system enhances the rainfall use efficiency and crop yield in rain-fed areas of north-western China. In this study, we determined the effects of RFRH on the soil fungal community composition and diversity in a 5-year fertilisation experiment (N : P fertiliser rates of 0 : 0, 150 : 75, 300 : 150, and 450 : 225 kg ha–1 year–1) in the dryland farming area of the Loess Plateau. Excessive fertiliser application reduced the crop productivity and a moderate rate of 300 : 150 kg ha–1 year–1) produced the highest maize yield. The available phosphorus (AP), organic carbon, nitrate-nitrogen (NO3-N) and total nitrogen contents increased with the fertiliser rate, whereas soil water content decreased. The relative abundances of Ascomycota, Fusarium and Zygomycota increased (P < 0.05) with the fertiliser application rate, whereas those of Basidiomycota and Glomeromycota decreased (P < 0.05). The fungal diversity (Shannon–Wiener index: P = 0.016) and composition (unweighted UniFrac: P = 0.024) were significantly affected by fertilisation. The NO3-N and AP were the main factors that affected fungal composition and diversity. Thus, fertilisation changed the fungal community composition and diversity, and a higher fertiliser rate negatively affected nutrient cycling and the stability of the soil ecosystem under RFRH.
Additional keywords: fertiliser rate, rainfall collection, ridge and furrow, semiarid region, soil fungal community, soil property.
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