Biodiversity Science ›› 2014, Vol. 22 ›› Issue (3): 392-400.doi: 10.3724/SP.J.1003.2014.13217

• Orginal Article • Previous Article     Next Article

Effects of different amounts of straw returning treatments on soil nematode community in purple soil

Cui Hua1, Pengfei Wu1, *(), Xianjin He1, Bo Zhu2   

  1. 1. College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610041
    2. Key Laboratory of Environmental Evolution and Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041
  • Received:2013-10-09 Accepted:2014-03-18 Online:2014-06-04
  • Wu Pengfei E-mail:wupf@swun.cn

We evaluated the effects of 4 years of straw returning (2007-2011) on the nematode communities of the purple soil area in the hilly areas of central Sichuan basin, China, using the four treatments of 100, 50, 30, and 0% of straw returned to cropland. The Baermann method was used to extract nematodes from soil samples (0-15 cm). A total of 2,380 individuals, belonging to 2 classes, 8 orders, 24 families, and 39 genera, were extracted. The dominant genera included Tylencholaimus and Prionchulus, comprising 31% of total soil nematode individuals. Our results showed that soil nematode communities differed among the four treatments. Densities of the total nematode community, and fungivores and predators-omnivores specifically exhibited greater fluctuations with reducing straw return levels, while densities of bacterivores increased with reducing straw levels. Plant-parasite density, diversity index(H'), plant-parasite index (PPI) and Wasilewska index (WI) first increased and then decreased with reduction of straw return, while genera number, free-living nematode maturity index (MI) and channel ratio (CR) presented the opposite trend. Nematode diversity index (H') was highest at 30-50% straw return levels. But there were no significant differences among treatments for all of the indexes. The content of soil available potassium, which significantly increased at the lower levels of straw return, was significantly correlated with diversity indices of nematode communities. Our results suggested that straw return management changes the nematode community through its action on the content of soil available potassium, and that level of 30-50% of straw returning were optimal in the hilly areas of central Sichuan basin in terms of maximizing nematode diversity.

Key words: amounts of straw returning, soil nematode, diversity, community structure, trophic groups

Table 1

Soil chemical properties of different amounts of straw returning treatments in purple soil (n=16)"

项目
Item
有机质
Soil organic material (g/kg)
全氮
Total N (g/kg)
有效磷
Available P (mg/kg)
速效钾
Available K (mg/kg)
pH
RMW1 14.52±0.43a 1.01±0.04a 12.25±0.25a 144.50±8.86a 8.31±0.09a
RMW2 13.07±0.85a 0.87±0.03b 10.75±0.63a 126.75±2.10a 8.42±0.06a
RMW3 12.68±0.20a 0.89±0.00b 10.00±0.41a 104.75±5.88ab 8.26±0.06a
CK 12.10±0.73a 0.87±0.04b 11.00±0.71a 106.50±1.19b 8.34±0.05a
F 2.87 4.02 3.11 11.89 1.10
P >0.05 <0.05 >0.05 <0.01 >0.05

Table 2

Composition and quantity of soil nematode under different amounts of straw returning treatments in purple soil"

类群 Group RMW1 RMW2 RMW3 CK 合计 Total 营养类群 Trophic group
矛线目 Dorylaimida
垫咽属 Tylencholaimus 95 141 92 147 475 Fu4
大矛属 Enchodelus 16 15 34 37 102 PO4
剑属 Xiphinema 25 40 26 27 118 Pl4
短体长针属 Longidorella 18 18 16 20 72 Pl4
长针属 Longidorus 0 12 0 5 17 Pl4
矛线属 Dorylaimus 30 39 22 21 112 PO4
中矛线属 Mesodorylaimus 0 0 1 4 5 PO4
无咽属 Alaimus 1 24 19 2 46 Ba4
穿咽属 Nygolaimus 5 0 0 14 19 PO5
小计 Total 190 289 210 277 966
单齿目 Mononchida
锯齿属 Prionchulus 87 54 20 104 265 PO4
锉齿属 Mylonchulus 30 58 33 67 188 PO4
基齿属 Iotonchus 3 6 8 15 32 PO4
单齿属 Mononchus 0 0 0 1 1 PO4
小计 Total 120 118 61 187 486
窄咽目 Araeolaimida
柱咽属 Cylindrolaimus 20 17 18 19 74 Ba3
管咽属 Aulolaimus 0 0 0 25 25 Ba3
巴氏属 Bastiania 10 22 21 32 85 Ba3
绕线属 Plectus 15 0 0 4 19 Ba2
杆咽属 Rhabdolaimus 0 2 4 1 7 Ba3
小计 Total 45 41 43 81 210
嘴刺目 Enoplida
托布利属 Tobrilus 0 74 29 13 116 PO3
三孔属 Tripyla 0 0 0 1 1 PO3
小计 Total 0 74 29 14 117
色矛目 Chromadorida
异色矛属 Achromadora 3 0 7 3 13 PO3
色矛属 Chromadorita 0 0 0 2 2 PO3
小计 Total 3 0 7 5 15
单宫目 Monhysterida
单宫属 Monhystera 0 0 0 11 11 Ba1
小计 Total 0 0 0 11 11
小杆目 Rhabditida
原杆属 Protorhabditis 17 67 79 62 225 Ba1
明杆属 Rhabditophanes 18 9 6 14 47 Ba1
小杆属 Rhabditis 0 0 1 0 1 Ba1
齿咽属 Odontopharynx 21 13 0 31 65 Ba1
后双胃属 Metadiplogaster 0 0 0 4 4 Ba1
伪杆咽属 Rhabdontolaimus 0 0 0 3 3 Ba1
头叶属 Cephalobus 9 3 19 2 33 Ba2
鹿角唇属 Cervidellus 0 4 5 0 9 Ba2
伪双胃属 Pseudodiplogasteroide 0 1 1 4 6 Ba1
盆咽属 Panagrolaimus 2 0 0 1 3 Ba1
小计 Total 67 97 111 121 396
垫刃目 Tylenchida
短体属 Pratylenchus 23 28 47 7 105 Pl3
根潜属 Hirschmanniella 2 0 0 0 2 Pl3
针属 Paratylenchus 10 10 31 7 58 Pl2
伪垫刃属 Nothotylenchus 0 0 0 9 9 Fu2
刺属 Belonolaimus 0 2 0 2 4 Pl3
柄端球属 Paurodontus 0 0 0 1 1 Fu2
小计 Total 35 40 78 26 179
总个体数 Total individuals 460 659 539 722 2,380
总类群数 Total group number 22 23 23 36 39

Fig. 1

Densities of nematode community and each trophic group of different amounts of straw returning treatments in purple soil (Mean±SE)"

Table 3

Repeated measurement analysis on the nematode densities at community and trophic-group levels in purple soil"

项目 Item 线虫群落
Community
食细菌类群Bacterivores 食真菌类群Fungivores 植物寄生类群
Plant-parasites
捕食-杂食类群Predators-Omnivores
F P F P F P F P F P
月份 Month 1.86 0.20 0.67 0.43 11.39 0.01 0.25 0.63 0.01 0.97
处理 Treatment 0.56 0.65 0.55 0.66 0.16 0.92 1.63 0.24 0.70 0.57
月份×处理 Month×Treatment 0.43 0.74 0.64 0.60 0.67 0.59 0.20 0.90 0.32 0.81

Fig. 2

Diversity and ecological indices of soil nematode community of different amounts of straw returning treatments in purple soil (Mean±SE)"

Table 4

Repeated measurement analysis on the diversity and ecological indices of soil nematode communities in purple soil"

项目 Item 类群数
Group
number
Shannon-Wiener多
样性指数
Shannon-Wiener index (H')
自由生活成熟指数
Free-living nematode
maturity index
(MI)
植物寄生成
熟指数
Plant-parasite
Index (PPI)
线虫通路
比值
Channel ratio
(CR)
瓦斯乐斯
卡指数
Wasilewska index (WI)
F P F P F P F P F P F P
月份 Month 0.49 0.50 3.40 0.09 6.89 0.02 1.57 0.23 6.60 0.02 3.49 0.09
处理 Treatment 2.19 0.14 0.99 0.43 3.23 0.06 3.43 0.05 0.84 0.50 0.41 0.75
月份×处理 Month×Treatment 0.86 0.49 0.91 0.46 2.75 0.09 1.25 0.34 0.91 0.47 1.81 0.20

Fig. 3

Ordinations of principle components analysis performed on soil nematode communities in purple soil. The Chinese name of each genera was showed in Table 2."

Table 5

Correlation coefficients between soil properties and soil nematode communities"

项目
Item
有机质
Soil organic matter
全氮
Total N
有效磷
Available P
速效钾
Available K
pH
PC1得分 PC1 scores -0.10 -0.23 -0.55* -0.38 -0.30
PC2得分 PC2 scores 0.09 0.02 0.39 0.01 -0.33
总密度 Total density -0.18 -0.26 -0.51* -0.21 -0.20
食细菌类群 Bacterivores -0.41 -0.36 -0.53* -0.43 -0.28
食真菌类群 Fungivores -0.01 -0.16 -0.41 -0.17 -0.22
植物寄生类群 Plant-parasites 0.04 -0.02 -0.51* -0.21 -0.30
捕食-杂食类群 Predators-Omnivores -0.05 -0.25 -0.21 -0.04 0.00
Shannon-Wiener多样性指数 Shannon-Wiener index (H') -0.40 -0.42 -0.32 -0.57* -0.37
类群数 Group number -0.31 -0.14 -0.19 -0.52* -0.30
自由生活成熟指数 Free-living nematode maturity index (MI) 0.06 0.23 0.03 0.09 0.11
植物寄生成熟指数 Plant-parasite index (PPI) 0.24 0.01 -0.04 0.10 -0.12
线虫通路比值 Channel ratio (CR) -0.37 -0.25 0.01 -0.26 -0.21
瓦斯乐斯卡指数 Wasilewska index (WI) -0.39 -0.43 0.12 -0.31 -0.17
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