土壤线虫对短期水分变化的响应  

Responses of Soil Nematodes to Short-term Soil Water Content Changes

作　　者：李萌[1] 何先进[1] 吴鹏飞[1] 

机构地区：[1]西南民族大学青藏高原研究院,四川成都610041

出　　处：《西南农业学报》2014年第2期710-714,共5页Southwest China Journal of Agricultural Sciences

基　　金：国家自然科学基金(41371270;40801092);四川省青年基金项目(2012JQ0030);国家科技支撑计划项目(2011BAK12B004);中央高校基本科研业务费专项(2014NZYTD01)

摘　　要：为了查明土壤水分对土壤线虫的影响,采用室外土壤灌水和室内土壤淹水分别研究土壤线虫密度对淹水程度和淹水时间变化的响应。结果显示,室外灌水实验中,随着土壤含水率逐渐降低,土壤线虫密度先增加后下降,在土壤含水率为21.8%时密度最大;室内土壤淹水实验中,土壤淹水时间越长,分离出的土壤线虫个体数和类群数越少。这表明土壤含水率差异会影响线虫在土壤中的分布,土壤含水过高会造成土壤线虫死亡。因此,建议在采集用于分离线虫的土样时应避开暴雨天气,并且不要在积水区域采样。Intense rainfall that frequently occurs in summer can alter soil water content,which is an important factor affecting the soil nematode.To investigate whether soil nematode the effect of the intense rain,two experiments were conducted.One was carried out in the field to simulate waterlogging,while the other was a laboratory experiment in which keep the soil samples submerged from one to four days.Soil nematodes were separated at different waterlogging time in both of the experiments.The results showed that in the field experiment,the density of soil nematodes first increased and then decreased with the soil water content decreasing,with a maximum when the soil water content was 21.8％.However,in the laboratory experiment,the abundance and richness of the nematodes were decreased with an increasing of the waterlogging duration.This indicated that the distribution of soil nematodes could be affected by waterlogging degree,and saturation of soil water content might induce the death of soil nematodes.Therefore,sampling in a heavy rain or water area was not recommended.

关 键 词：土壤线虫 土壤水分 淹水程度 淹水时间 

分 类 号：S152.4[农业科学—土壤学]