Crops ›› 2017, Vol. 33 ›› Issue (5): 85-92.doi: 10.16035/j.issn.1001-7283.2017.05.015

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Effects of Microbial Fertilizer on Soil Characteristics and Root Exudates of Oats in Saline-alkali Land

Lu Peina,Liu Jinghui,Zhao Baoping,Li Lijun,Lei Xuefeng,Zhang Fengyi   

  1. Agricultural College,Inner Mongolia Agricultural University,Hohhot 010019,Inner Mongolia,China
  • Received:2017-07-04 Revised:2017-08-22 Online:2017-10-15 Published:2018-08-26
  • Contact: Jinghui Liu

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Abstract:

Different salt resistance oats varieties Neiyan No.5 and Baiyan No.2 were used as test materials, and microbial fertilizer and no microbial fertilizer two treatments were used to study the physicochemical and biological properties of soil and root exudates of oats in saline-alkali land. The results showed that microbial fertilizers could improve the contents of soluble sugar and oxalic acid in the rhizosphere soil and the non-rhizosphere soil. The contents of soluble sugar, oxalic acid, and malic acid in the rhizosphere soil were higher than that in the non-rhizosphere soil. The content of organic acids and content of SMB-N or surcease activity in root zone (horizontal distance 0-5cm, depth 0-10cm) were significantly positive correlation under different treatments. Microbial fertilizers could reduce soil pH and EC, but increase soil water content, soil microbial biomass and soil enzyme activities. The soil pH and EC in root zone were significantly positive correlation, and soil water content and SMB-N or soil enzyme activities showed significant positive correlation in different treatments.

Key words: Oats, Root exudates, Microbial fertilizer, Saline-alkali land, Soil characteristics

Fig.1

Effects of microbial fertilizer on the pH value of soil Different letters above columns mean significant among different treatments in different soil depth (P﹤0.05), the same below"

Fig.2

Effects of microbial fertilizer on soil conductivity"

Fig.3

Effects of microbial fertilizer on soil water content"

Table 1

Effects of microbial fertilizer on contents of SMB-C、SMB-N and soil enzyme activities"

水平距离(cm)
Horizontal distance		 土层深度(cm)
Depth of soil		 处理
Treatment		 SMB-C含量
(mg/kg)
SMB-C content		 SMB-N含量
(mg/kg)
SMB-N content		 酶活性 Enzyme activity
U1
[0.1mol/L KMnO4mL/(g·30min)]		 U2
[NH4-Nmg/(g·24h)]		 U3
[glucose mg/(g·24h)]		 U4
[phenol mg/(g·24h)]
0~5 0~10 A 116.58±38.45bcd 1.85±1.80cd 11.15±0.99d 0.65±0.08bc 19.01±4.05a 9.22±1.27ab
AM 140.26±34.34abc 3.59±1.35abc 12.42±1.25abcd 0.68±0.18bc 21.87±9.64a 10.26±2.39a
B 89.21±36.93d 2.52±1.17bcd 12.19±1.26bcd 0.66±0.09bc 19.51±1.40abc 8.63±0.51b
BM 154.74±8.86ab 2.65±0.40bcd 12.71±1.14abcd 0.69±0.14bc 20.56±0.74abc 9.12±0.60ab
10~20 A 150.26±19.34ab 4.20±1.09ab 12.79±0.76abcd 0.65±0.05bc 22.47±4.94ab 8.46±0.22bc
AM 166.58±43.86a 4.92±2.86a 14.07±2.63ab 0.67±0.01bc 25.36±2.67a 9.72±1.11ab
B 93.16±10.61d 2.38±1.97bcd 13.71±0.94abc 0.88±0.17ab 22.44±4.50a 9.39±0.71ab
BM 93.42±22.55d 4.12±1.49ab 13.85±0.70abc 0.96±0.22a 23.29±4.29a 9.90±1.69ab
20~40 A 93.42±46.84d 0.86±0.68d 12.05±0.99bcd 0.44±0.17c 16.20±4.28c 6.90±0.02d
AM 115.53±11.93bcd 1.03±0.58d 13.47±2.83abc 0.60±0.26c 18.33±5.28abc 7.08±0.54cd
B 101.05±29.99cd 1.05±0.94d 11.91±0.72cd 0.48±0.31c 15.56±1.82bc 6.55±0.50d
BM 122.11±8.80bcd 1.45±0.85d 14.26±0.92a 0.57±0.22c 17.76±0.71abc 6.75±0.71d
5~10 0~10 A 59.65±27.56de 0.58±0.47de 11.23±0.23b 0.51±0.15bc 12.37±6.94abc 8.53±0.21b
AM 68.86±16.13cde 2.18±1.25bc 11.53±0.39ab 0.65±0.07ab 13.55±8.61ab 8.60±0.66b
B 101.67±26.20abcd 1.24±0.23cde 11.87±0.93ab 0.66±0.02ab 20.42±2.88ab 9.10±0.42ab
BM 130.61±36.92a 1.67±0.75cde 12.54±1.38ab 0.66±0.10ab 26.86±10.82a 9.39±1.71ab
10~20 A 40.79±53.16e 1.77±0.69cd 12.13±0.94ab 0.74±0.15a 11.45±8.51abc 9.81±0.55a
AM 120.00±30.17ab 2.29±1.88abc 12.97±1.32a 0.75±0.09a 19.60±2.26ab 9.87±0.55a
B 65.53±31.27de 3.14±0.36ab 11.84±1.33ab 0.73±0.13a 19.80±1.59abc 9.01±0.66ab
BM 114.74±21.52abc 3.52±0.45a 12.88±1.13a 0.77±0.10a 21.49±2.30ab 9.37±1.06ab
20~40 A 67.11±47.49de 0.40±0.13e 11.41±1.67ab 0.34±0.25c 12.94±6.30d 6.42±0.36c
AM 85.79±28.64abcde 1.68±1.55cd 12.12±0.53ab 0.49±0.08bc 15.12±7.88bcd 6.58±0.21c
B 75.88±16.08bcde 1.34±0.49cde 11.29±1.68b 0.39±0.16c 11.24±1.28cd 6.56±0.57c
BM 106.05±31.64abcd 1.79±0.15cd 12.78±0.29ab 0.40±0.23c 11.63±1.33cd 7.36±0.87c

Table 2

Effects of microbial fertilizer on root exudates of different salt resistance oats"

处理Treatment 可溶性糖(mg/g)
Soluble sugar		 有机酸Organic acid (μg/g)
草酸Oxalic acid 苹果酸Malic acid 总有机酸Total organic acid
根际土Rhizosphere soil A 0.155 213.65 16.06 229.71
AM 0.169 334.43 17.53 351.96
B 0.104 311.81 12.06 323.87
BM 0.111 527.79 9.86 537.65
非根际土Non-rhizosphere soil A 0.145 6.59 10.74 17.33
AM 0.159 7.21 12.73 19.94
B 0.097 7.31 11.80 19.11
BM 0.104 7.54 - 7.54

Table 3

Correlation analysis of physicochemical and biological properties of soil"

指标Index pH EC SWC SMB-C SMB-N U1 U2 U3 U4
pH -1
EC -0.817** -1
SWC -0.176 -0.362 1
SMB-C -0.236 -0.339 0.204 1
SMB-N -0.424* -0.540** 0.561** 0.532** 1
U1 -0.030 -0.142 0.410* 0.562** 0.511** 1
U2 -0.539** -0.621** 0.711** 0.196 0.648** 0.492** 1
U3 -0.412* -0.560** 0.588** 0.701** 0.659** 0.567** 0.665** 1
U4 -0.798** -0.828** 0.481** 0.258 0.639** 0.228 0.826** 0.596** 1

Table 4

Correlation analysis of root exudates of oats and biological properties of soil"

指标Index SMB-C SMB-N U1 U2 U3 U4
草酸Oxalic acid 0.421 0.995** 0.649 0.636 0.962** 0.776
总有机酸Total organic acid 0.442 0.997** 0.676 0.664 0.969** 0.765
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