In the Loess Plateau of China, land-use pattern is a major factor in controlling underlying biological processes. Additionally, the process of land-use pattern was accompanied by abandoned lands, potentially impacting soil microbe. However, limited researches were conducted to study the impacts of land-use patterns on the diversity and community of soil microorganisms in this area. The study aimed to investigate soil microbial community diversity and composition using high-throughput deoxyribonucleic acid (DNA) sequencing under different land-use patterns (apricot tree land, apple tree land, peach tree land, corn land, and abandoned land). The results showed a substantial difference (P<0.050) in bacterial alpha-diversity and beta-diversity between abandoned land and other land-use patterns, with the exception of Shannon index. While fungal beta-diversity was not considerably impacted by land-use patterns, fungal alpha-diversity indices varied significantly. The relative abundance of Actinobacteriota (34.90%), Proteobacteria (20.65%), and Ascomycota (77.42%) varied in soils with different land-use patterns. Soil pH exerted a dominant impact on the soil bacterial communities' composition, whereas soil available phosphorus was the main factor shaping the soil fungal communities' composition. These findings suggest that variations in land-use pattern had resulted in changes to soil properties, subsequently impacting diversity and structure of microbial community in the Loess Plateau. Given the strong interdependence between soil and its microbiota, it is imperative to reclaim abandoned lands to maintain soil fertility and sustain its function, which will have significant ecological service implications, particularly with regards to soil conservation in ecologically vulnerable areas.
ZHANG Jian, GUO Xiaoqun, SHAN Yujie, LU Xin, CAO Jianjun. Effects of land-use patterns on soil microbial diversity and composition in the Loess Plateau, China. Journal of Arid Land, 2024, 16(3): 415-430.
Fig. 1(a), location of the sampling sites; (b), AL (abandoned land); (c), AT (apple land); (d), ATL (apricot land); (e), CL (corn land); (f), PTL (peach land). The abbreviations are the same as in the following figures. Note that the figure 1a is based on the standard map of the Earth Online (https://www.earthol.com/bd/), and the standard map has not been modified.
Soil property
AT
PTL
ATL
CL
AL
SOC (g/kg)
7.13±0.60a
7.58±1.57a
5.67±0.35a
7.34±1.10a
6.48±1.53a
TN (g/kg)
0.24±0.14b
0.56±0.10a
0.25±0.04b
0.36±0.04ab
0.18±0.04b
TP (g/kg)
0.63±0.13ab
0.31±0.08b
0.99±0.41a
0.19±0.07b
0.40±0.07b
NH4+-N (mg/kg)
2.81±0.37ab
2.69±0.44ab
4.16±0.88a
3.26±0.50ab
2.27±0.38b
NO3--N (mg/kg)
28.24±3.18ab
23.43±4.52bc
11.06±1.24d
33.76±2.76a
18.54±2.88cd
AP (mg/kg)
9.37±0.93bc
11.79±1.70ab
14.06±1.00a
8.97±1.27bc
7.03±0.63c
pH
8.47±0.04a
8.45±0.03ab
8.28±0.12b
8.41±0.03ab
8.55±0.03a
SS (g/kg)
0.06±0.002a
0.06±0.003a
0.09±0.03a
0.07±0.01a
0.05±0.01a
SWC (%)
0.48±0.32a
0.16±0.01a
0.13±0.01a
0.19±0.01a
0.15±0.04a
BD (g/cm3)
1.73±0.03a
1.67±0.01ab
1.72±0.06a
1.65±0.03ab
1.57±0.08b
Table 1 Soil properties among different land-use patterns
Microbe
Land-use pattern
Good's coverage (%)
Chao1
Shannon
Sobs
Bacteria
AT
0.9612b
4091.90±58.99a
6.6763±0.02a
2857.80±43.07a
PTL
0.9623b
3982.55±137.66a
6.6276±0.05a
2852.20±81.26a
ATL
0.9626b
3906.05±100.82a
6.5571±0.07a
2755.40±83.67a
CL
0.9636b
3898.12±94.33a
6.6394±0.01a
2753.00±34.95a
AL
0.9691a
3311.57±257.73b
6.4621±0.14a
2427.60±170.74b
Fungi
AT
0.9979b
500.38±14.10a
4.3488±0.13a
442.80±15.69a
PTL
0.9988a
371.67±30.87b
3.8334±0.28ab
349.40±28.77b
ATL
0.9980b
415.26±26.32b
3.4909±0.31b
365.80±26.67b
CL
0.9979b
414.17±28.91b
3.5820±0.41ab
355.20±28.91b
AL
0.9988a
365.56±28.63b
3.9021±0.23ab
336.20±25.52b
Table 2 Differences in microbial diversity among different land-use patterns
Fig. 2Non-metric multidimensional scaling (NMDS) analysis of bacteria (a) and fungi (b) among different land-use patterns at the phylum level. R value is the ANOSIM (analysis of similarities) statistic R, and P value is the significance from permutation.
Fig. 3Relative abundance of dominant bacterial (a and c) and fungal (b and d) communities at the phylum level among different land-use patterns. Different lowercase letters within the same microbe indicate significant differences under different land-use patterns at P<0.050 level.
Fig. 4Venn diagram represents the operational taxonomic units (OUTs) of bacterial (a) and fungal (b) communities among different land-use patterns
Fig. 5Cladogram depicting the phylogenetic distribution of bacterial (a) and fungal (b) lineages among different land-use patterns. Linear discriminant analysis (LDA) score histogram was computed for species with varying abundances in bacterial and fungal communities, and identified using a threshold value of 4.0.
Fig. 6Redundancy analysis (RDA) for the relationship between bacterial community and environmental variables (a), and between fungal community and environmental variables (b). SOC, soil organic content; TN, total nitrogen; TP, total phosphorus; AP, available phosphorus; SS, soil salinity; SWC, soil water content, BD, bulk density. The abbreviations are the same as in Figure 7.
Soil property
Bacteria
Fungi
RDA1
RDA2
R2
P
RDA1
RDA2
R2
P
SOC
0.1519
0.9884
0.128
0.203
-0.924
0.3824
0.000
0.998
TN
0.3703
0.9289
0.112
0.273
0.3729
0.9279
0.147
0.203
TP
0.7140
0.7002
0.015
0.780
-0.6587
0.7524
0.200
0.093
NH4+-N
0.9286
-0.3710
0.220
0.067
0.4054
0.9141
0.053
0.563
NO3--N
0.4953
0.8687
0.107
0.310
0.7562
-0.6544
0.038
0.649
AP
0.9982
-0.0603
0.282
0.028*
0.7652
0.6437
0.302
0.020*
pH
-0.9334
0.3588
0.654
0.010*
-0.6964
-0.7176
0.017
0.804
SS
0.8473
-0.5310
0.430
0.052
-0.2629
0.9648
0.005
0.949
SWC
-0.2024
-0.9793
0.213
0.081
0.9142
-0.4052
0.143
0.167
BD
0.8365
0.5480
0.089
0.305
0.9804
-0.1968
0.149
0.175
Table 3 Relationships between soil properties and two axes of redundancy analysis (RDA) for bacterial and fungal communities
Fig. 7Correlations between bacterial community and soil properties (a) and between fungal community and soil properties (b). *, P<0.050 level; **, P<0.010 level; ***, P<0.001 level.
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