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地上部植食者褐飞虱对不同水稻品种土壤线虫群落的影响

生物多样性 2009, 17 (5): 431–439 d oi: 10.3724/SP.J.1003.2009.09087 Biodiversity Science http: //http://www.doczj.com/doc/88f3c44cb307e87101f696d9.html

地上部植食者褐飞虱对不同水稻品种

土壤线虫群落的影响

刘满强1*黄菁华1陈小云1王峰1葛成2苏昱1

邵波3汤英1李辉信1胡锋1

1 (南京农业大学资源与环境科学学院土壤生态实验室, 南京 210095)

2 (南京农业大学植物保护学院, 南京 210095)

3 (南京农业大学农学院, 南京 210095)

摘要: 地上和地下部生物群落的交互作用对于调控陆地生态过程具有重要作用。在盆栽条件下利用2×2析因设计研究了褐飞虱(Nilaparvata lugens)取食不同水稻品种后对土壤线虫群落的影响。结果表明, 褐飞虱侵害水稻9 d后, 感虫品种(广四和汕优63)的土壤线虫总数、属数及自生线虫(食细菌线虫、食真菌线虫和捕食性线虫)数量增加, 并且一般达到显著水平(P<0.05); 而上述指标在抗虫品种(汕优559和IR36)土壤中则呈现相反的趋势。植食性线虫数量在强感虫品种广四上显著增加(P<0.05), 而在强抗虫品种IR36上显著减少(P<0.05)。褐飞虱和水稻品种对土壤线虫的生态指数(线虫通道指数、Shannon-Wiener指数、成熟度指数、富集指数和结构指数)没有明显影响, 可能与供试土壤线虫群落组成单一及褐飞虱作用时间较短有关。总之, 褐飞虱强烈影响土壤线虫数量、群落组成和营养结构, 并且作用的方向(促进或抑制)和程度依赖于水稻的品种特性, 揭示出地上部植食者的短期侵害将对稻田土壤生态系统的结构和功能产生深远影响。

关键词:地上部和地下部, 感虫/抗虫品种, 线虫群落, 营养类群

Aboveground herbivory by the brown planthopper (Nilaparvata lugens) affects soil nematode communities under different rice varieties

Manqiang Liu1*, Jinghua Huang1, Xiaoyun Chen1, Feng Wang1, Cheng Ge2, Yu Su1, Bo Shao3, Ying Tang1, Huixin Li1, Feng Hu1

1Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095

2College of Plant Protection, Nanjing Agricultural University, Nanjing 210095

3Agricultural College, Nanjing Agricultural University, Nanjing 210095

Abstract: Interactions between aboveground–belowground communities play an important role in regulating terrestrial ecological processes; however, the interactions between rice varieties, herbivory and the soil community are often ignored. A pot experiment with a full 2×2 factorial design was conducted to examine the impacts of the brown planthopper (Nilaparvata lugens) and rice variety (susceptible or resistant) on the soil nematode community. The results showed that, after nine days, aboveground herbivory significantly (P<0.05) increased total abundance, numbers of nematode genera and the number of free-living nematodes (such as bacterivores, fungivores, and predators), under the rice varieties susceptible to the brown planthopper (Guangsi and Shanyou63), whereas an opposite trend was observed under the rice varieties resistant to the brown planthopper (Shanyou559 and IR36). In the presence of planthoppers, herbivorous nematodes significantly increased under the most susceptible rice variety Guangsi bu
t significantly decreased under the most resistant rice variety IR36. Both planthopper and rice variety had negligible influences on ecological indices of the soil nematode community, including nematode channel ratio (NCR), ——————————————————

Abstract: Interactions between aboveground–belowground communities play an important role in regulating terrestrial ecological processes; however, the interactions between rice varieties, herbivory and the soil community are often ignored. A pot experiment with a full 2×2 factorial design was conducted to examine the impacts of the brown planthopper (Nilaparvata lugens) and rice variety (susceptible or resistant) on the soil nematode community. The results showed that, after nine days, aboveground herbivory significantly (P<0.05) increased total abundance, numbers of nematode genera and the number of free-living nematodes (such as bacterivores, fungivores, and predators), under the rice varieties susceptible to the brown planthopper (Guangsi and Shanyou63), whereas an opposite trend was observed under the rice varieties resistant to the brown planthopper (Shanyou559 and IR36). In the presence of planthoppers, herbivorous nematodes significantly increased under the most susceptible rice variety Guangsi but significantly decreased under the most resistant rice variety IR36. Both planthopper and rice variety had negligible influences on ecological indices of the soil nematode community, including nematode channel ratio (NCR), ——————————————————

收稿日期: 2009-04-09; 接受日期: 2009-06-26

基金项目: 国家大学生创新性实验计划(GJ0721)

* 通讯作者Author for correspondence. E-mail: liumq@http://www.doczj.com/doc/88f3c44cb307e87101f696d9.html