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Journal of Arid Land  2026, Vol. 18 Issue (6): 1076-1097    DOI: 10.1016/j.jaridl.2026.06.009    
Research article     
Response of soil microarthropod communities to long-term water and nitrogen changes in desert steppes, China
MA Shangfei1, LI Jing2, WU Zhendan1, YE He1, WEN Xin3, HONG Mei1,4,5,*()
1 College of Resources and Environment Sciences, Inner Mongolia Agricultural University, Hohhot 010018, China
2 Inner Mongolia Agriculture and Animal Husbandry Technology Popularization Center, Hohhot 010018, China
3 Agricultural and Livestock Ecology and Resource Protection Center of Otog Front Banner, Erdos 016299, China
4 Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources, Hohhot 010018, China
5 Key Laboratory of Agricultural Ecological Security and Green Development at Universities of Inner Mongolia Autonomous Region, Hohhot 010018, China
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Abstract  

Desert steppe ecosystems are highly sensitive to variations in water and nitrogen (N) levels. Soil microarthropods serve as crucial indicators of belowground ecological processes, yet their responses to long-term water-N interactions remain unclear. This study investigated the combined effects of long-term N deposition and rainfall variation on the microarthropod community in the desert steppe soil, as well as their potential driving mechanisms. Utilizing a field control experimental platform for global change in the desert steppe of Inner Mongolia Autonomous Region, China, researchers had established a multigradient two-factor (water-N) experiment since 2015. The experiment employed a split-plot design with three water levels (natural rainfall (NR), 30.00% rainfall enhancement (RE), and 30.00% rainfall reduction (RR)) and four N addition levels (0 (N0), 30 (N30), 50 (N50), and 100 (N100) kg N/(hm2•a)), resulting in 12 treatment combinations. After the experimental treatments had been conducted for 5 a and treatment effects had reached a long-term steady state, we collected the soil samples to analyze the variations of soil microarthropod communities. The results revealed that at varying water conditions, N addition increased the abundance, number of taxa, and diversity of soil microarthropods. In the RE treatment, the total abundance and total number of taxa of soil microarthropods were significantly greater than those in the NR and RR treatments. Water-N interactions had a significant effect on soil microarthropod community structure, with the N30 treatment coupled with water variation having the strongest effect. Moreover, the influence of N addition on soil microarthropod communities depended on water changes; both the RR and RE treatments amplified the effect of N addition, with the RR treatment resulting in the greatest amplification. N deposition and changes in rainfall shape the soil microarthropod community by altering key environmental factors. N addition and water variation positively affect the abundance of soil microarthropods by increasing the ammonium nitrogen (NH4+-N) content, litter fall (LF), and soil moisture (SM) content. The interaction between water and N primarily promotes soil microarthropod abundance by reducing the NH4+-N content and increasing the biomass of perennial grass. In summary, this study not only reveals the key pathways through which water and N drive changes in the soil microarthropod community in desert steppes but also provides a scientific basis for understanding soil biodiversity maintenance and ecosystem management in arid regions under global change.



Key wordsnitrogen deposition      rainfall variation      soil microarthropod      community structure      desert steppe     
Received: 20 November 2025      Published: 30 June 2026
Corresponding Authors: * HONG Mei (E-mail: nmczhm1970@126.com)
About author: First author contact:

Conceptualization: MA Shangfei; Methodology: MA Shangfei, LI Jing, WU Zhendan, YE He, WEN Xin; Formal analysis: MA Shangfei, LI Jing, WU Zhendan; Writing - original draft preparation: MA Shangfei; Writing - review and editing: HONG Mei; Funding acquisition: HONG Mei. All authors approved the manuscript.

Cite this article:

MA Shangfei, LI Jing, WU Zhendan, YE He, WEN Xin, HONG Mei. Response of soil microarthropod communities to long-term water and nitrogen changes in desert steppes, China. Journal of Arid Land, 2026, 18(6): 1076-1097.

URL:

http://jal.xjegi.com/10.1016/j.jaridl.2026.06.009     OR     http://jal.xjegi.com/Y2026/V18/I6/1076

Fig. 1 Study area in Siziwang Banner, Ulanqab City, Inner Mongolia Autonomous Region, China (a), and photos of the 30.00% rainfall enhancement (b) and 30.00% rainfall reduction (c) treatments. DEM, digital elevation model.
Table S1 Changes in soil microarthropod abundance and ovcupancy underdifferent water-ntrogen (N) interactions in Sipa breviflora Griseb.desert steppe
Fig. 2 Distribution of soil microarthropod communities under different nitrogen (N) addition treatments at each water level. RR (a), NR (b), and RE (c) represent 30.00% rainfall reduction, natural rainfall, and 30.00% rainfall enhancement, respectively. N0, N30, N50, and N100 denote N application rates of 0, 30, 50, and 100 kg N/(hm2•a), respectively. T1-T31 correspond to soil microarthropod taxa at the family level. The specific taxa corresponding to each code are listed in Table S1.
Factor Water N Water×N
df F df F df F
Individual 3 19.79*** 4 15.29*** 12 2.85*
Taxa number 3 10.80*** 4 11.41*** 12 0.92
Simpson index 3 4.58* 4 1.94 12 1.42
Shannon-wiener index 3 10.04*** 4 9.22*** 12 1.25
Margalef index 3 1.51 4 2.21 12 1.46
Pielou index 3 6.12** 4 13.86*** 12 1.02
Table S2 Two-way analysis of variance (ANOVA) of soil microarthropod community composition and diversity under different water levels and N addition treatments
Fig. 3 Changes in soil microarthropod community structure under different water levels and N addition treatments. (a), species abundance; (b), taxa number. Different lowercase letters within the same water level indicate significant differences among different N treatments at P<0.050 level. *, P<0.050 level among different water levels. Boxes indicate the IQR (interquartile range, 75th to 25th of the data). The median value is shown as a line within the box. The colored diamonds represent the data. Whiskers extend to the most extreme value within 1.5×IQR.
Fig. 4 Changes in soil microarthropod diversity in desert steppe under different water levels and N addition treatments. (a), Simpson index; (b), Shannon-Wiener index; (c), Margalef index; (d), Pielou index. Different lowercase letters within the same water level indicate significant differences among different N treatments at P<0.050 level. *, P<0.050 level among different water levels.
Fig. 5 Changes in the similarity coefficient (q-value) of soil microarthropod communities in desert steppes under water-N interactions. The indices qNR-RE, qNR-RR, and qRE-RR compare the soil microarthropods levels between the NR and RE, NR and RR, and RE and RR levels, respectively. Different lowercase letters within the same pair of water levels indicate significant differences among different N treatments at P<0.050 level.
Fig. 6 Principal component analysis (PCA) result in soil microarthropod community structure at different water levels. (a), RR; (b), NR; (c), RE. PC, principal component.
Fig. 7 PCA result in soil microarthropod community structure under different N addition treatments. (a), N0; (b), N30; (c), N50; (d), N100.
Factor Water N Water×N
df F df F df F
pH 3 41.09*** 4 91.10*** 12 7.21***
TN 3 0.19 4 0.59 12 0.83
SOM 3 6.49** 4 7.28*** 12 1.52
AP 3 26.59*** 4 3.79* 12 8.20***
AK 3 3.92* 4 1.86 12 4.81**
NH4+-N 3 11.86*** 4 11.56*** 12 6.16***
NO3-N 3 412.87*** 4 288.04*** 12 131.93***
SM 3 95.20*** 4 0.21 12 0.70
T 3 109.45*** 4 0.47 12 1.29
AGB 3 848.44*** 4 22.61*** 12 7.28***
AB plants 3 335.43*** 4 18.49*** 12 3.70**
P. weeds 3 56.48*** 4 12.35*** 12 14.39***
P. grasses 3 63.15*** 4 4.43** 12 2.04
LF 3 233.73*** 4 1.55 12 5.04**
Richness index 3 6.80** 4 5.02** 12 0.77
Shannon-wiener index 3 17.29*** 4 9.13*** 12 4.33**
Pielou index 3 7.47** 4 13.54*** 12 9.88***
Simpson index 3 4.73* 4 6.49** 12 1.26
Table S3 Two-way ANOVA of soil physical-chemical properties, and plant community structure and diversity under different water levels and N addition treatments
Treatment pH TN (g/kg) SOM (g/kg) AP (mg/kg) AK (mg/kg) NH4+-N (mg/kg) NO3-N (mg/kg) SM (%) T (°C)
RR-N0 8.24±0.05a 1.76±0.08a 24.80±0.07b 4.01±0.09b 222.40±11.09b 1.43±0.10b 3.44±0.04d 5.03±0.02a 15.97±0.43a
RR-N30 8.06±0.03b 1.71±0.04a 28.11±0.77a 4.35±0.11a 244.19±4.54ab 1.49±0.07b 7.40±0.27c 4.82±0.01a 15.95±0.39a
RR-N50 8.13±0.02c 1.72±0.13a 28.00±0.39a 3.63±0.07c 257.86±11.50a 1.53±0.18b 20.84±0.76b 4.74±0.01a 15.61±0.42a
RR-N100 7.85±0.01d 1.77±0.03a 26.97±0.83a 4.28±0.14a 243.18±11.41ab 3.10±0.61a 32.51±2.50a 4.75±0.01a 16.29±0.18a
NR-N0 8.38±0.02a 1.71±0.07a 27.78±0.99a 3.25±0.08b 221.48±8.72a 1.06±0.05b 3.43±0.03c 6.69±0.03a 14.32±0.37a
NR-N30 8.24±0.10ab 1.69±0.04a 28.52±0.96a 3.58±0.07a 221.21±1.82b 1.99±0.40a 4.84±0.46b 6.59±0.01a 14.04±0.29a
NR-N50 8.11±0.08bc 1.80±0.07a 28.86±1.05a 3.38±0.12b 237.36±0.90a 1.59±0.19ab 5.38±0.31b 6.55±0.02a 13.99±0.55a
NR-N100 8.01±0.10c 1.80±0.06a 28.12±0.89a 3.70±0.17a 219.33±8.32b 1.92±0.37a 8.51±0.28a 6.72±0.01a 13.51±0.37a
RE-N0 8.56±0.02a 1.69±0.14a 26.87±0.70a 3.52±0.17a 229.00±4.93a 1.21±0.15a 3.27±0.33d 7.06±0.01a 13.48±0.23a
RE-N30 8.13±0.01c 1.83±0.02a 28.30±0.62a 3.75±0.16a 248.64±9.04a 1.34±0.09a 7.28±0.66c 7.77±0.01a 13.48±0.19a
RE-N50 8.25±0.01b 1.74±0.13a 27.59±0.43a 3.62±0.32a 228.46±10.70a 1.19±0.11a 5.44±0.17b 8.06±0.01a 13.51±0.26a
RE-N100 8.11±0.03c 1.79±0.07a 27.30±0.72a 2.60±0.23a 234.68±10.93a 1.27±0.21a 8.64±0.49a 7.93±0.02a 13.39±0.39a
RR 8.07±0.01c 1.74±0.02a 26.97±0.26b 4.07±0.01a 241.91±5.12a 1.89±0.08a 16.05±0.56a 4.85±0.01c 15.95±0.20a
NR 8.18±0.01b 1.75±0.03a 28.32±0.32a 3.49±0.13b 229.84±3.18a 1.64±0.10a 5.54±0.02b 6.63±0.01b 13.96±0.28b
RE 8.26±0.01a 1.76±0.04a 27.51±0.38ab 3.37±0.08b 235.19±2.13a 1.25±0.06b 6.16±0.12b 7.01±0.02a 13.47±0.06b
Table S4 Changes in soil physical-chemical properties under water-N interactions
Treatment AGB (g/m2) AB plants (g/m2) P. weeds (g/m2) P. grasses (g/m2) LF (g/m2) Richness index Shannon-
wiener index
Pielou index Simpson index
RR-N0 104.51±4.35ab 19.99±1.86ab 31.66±4.88a 39.17±8.16a 34.46±1.95c 6.92±0.46b 1.20±0.17b 0.58±0.05c 0.54±0.07b
RR-N30 111.26±11.70ab 18.79±1.18b 22.58±2.14bc 43.92±4.26a 41.39±0.89b 7.83±0.17a 1.46±0.01a 0.72±0.02ab 0.71±0.02a
RR-N50 98.47±2.05b 23.69±0.99a 16.39±3.65c 51.02±3.59a 54.69±4.93a 7.33±0.60ab 1.31±0.07b 0.67±0.03b 0.68±0.05a
RR-N100 117.75±4.24a 21.09±2.72ab 29.78±1.84ab 51.16±2.89a 45.75±2.71b 7.50±0.10ab 1.51±0.02a 0.79±0.03a 0.75±0.02a
NR-N0 159.82±3.37c 62.42±2.65b 10.67±0.87b 86.59±6.49b 100.10±0.51a 7.00±0.50b 1.41±0.03ab 0.68±0.02b 0.65±0.03a
NR-N30 191.97±3.71a 62.57±4.42b 14.50±4.47b 128.31±15.86a 97.25±13.27a 8.50±0.29a 1.61±0.06a 0.76±0.04a 0.67±0.08a
NR-N50 192.34±3.43a 78.84±3.02a 32.64±3.87a 88.35±6.52b 98.21±8.30a 8.33±1.01a 1.55±0.03ab 0.73±0.04ab 0.69±0.03a
NR-N100 183.09±1.98b 56.70±4.50b 23.96±5.56a 117.59±5.52a 96.03±6.88a 8.50±0.29a 1.44±0.17b 0.69±0.02ab 0.72±0.05a
RE-N0 237.7±5.98c 57.92±10.81b 29.13±4.65bc 105.84±14.92b 109.46±2.39b 7.83±0.93a 1.46±0.01b 0.68±0.02b 0.56±0.09a
RE-N30 291.57±4.62ab 66.15±1.41b 80.30±14.15a 142.12±16.47a 105.92±10.41b 8.75±0.25a 1.70±0.01a 0.64±0.01c 0.64±0.04a
RE-N50 278.1±12.11b 84.08±2.10a 29.51±1.48b 116.72±16.25ab 96.57±2.96b 8.75±0.52a 1.68±0.06a 0.58±0.10d 0.57±0.02a
RE-N100 312.89±20.51a 65.78±3.09b 80.36±15.98a 104.52±10.37b 127.68±7.30a 8.00±0.29a 1.52±0.05b 0.64±0.02a 0.67±0.05a
RR 107.99±1.85c 20.89±0.57b 25.10±1.88b 46.32±1.82c 44.07±0.54c 7.40±0.15b 1.41±0.02c 0.69±0.01ab 0.67±0.01a
NR 181.81±0.53b 65.13±1.49a 20.44±1.55b 105.21±0.95b 97.90±3.33b 8.08±0.11a 1.49±0.02b 0.71±0.02a 0.68±0.03a
RE 280.07±5.82a 68.48±1.36a 54.83±5.60a 117.30±6.39a 109.91±2.76a 8.33±0.28a 1.59±0.01a 0.66±0.01b 0.61±0.03a
Table S5 Effects of water-N interactions on vegetation biomass, litter fall (LF), and vegetation diversity
Fig. 8 Importance ranking of environmental factors affecting soil microarthropods under different water levels and N addition treatments. (a), RR; (b), NR; (c), RE; (d), N. LF, litter fall; AB plants, annual and biennial plants; AGB, aboveground biomass; AK, available potassium; P. weeds, perennial weeds; SOM, soil organic matter; AP, available phosphorus; TN, total nitrogen; SM, soil moisture; T, soil temperature; P. grasses, perennial grasses; MSE, mean square error. *, P<0.050 level; **, P<0.010 level.
Fig. 9 Main pathways affecting soil microarthropod abundance under different water levels and N addition treatments. The solid line indicates the direct effect and the dashed line indicates the indirect effect. *, P<0.050 level; **, P<0.010 level; ***, P<0.001 level.
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