Griffin G D, Asay K H, Horton W H
J Nematol. 1996 Mar;28(1):107-14.
The effects of environmental conditions on population trends of plant-parasitic nematodes were studied in experimental plots of five wheatgrasses in the western Utah desert. In a 3-year (1984-86) field study, soil water and temperature affected the population trends of the ectoparasites, Tylenchorhynchus acutoides and Xiphinema americanum, and the migratory endoparasite, Pratylenchus neglectus, on Fairway crested wheatgrass, Agropyron cristatum; 'Hycrest' crested wheatgrass, A. cristatum X A. desertorura; 'Rosana' western wheatgrass, Pascopyrum smithii; 'Oahe' intermediate wheatgrass, Thinopyrum intermedium; and RS-1 hybrid (Elytrigia repens X Pseudoroegneria spicata). The largest soil populations of these nematode species were collected in 1984 under good plant-growth conditions. A reduction in nematode populations occurred in 1985 and 1986, possibly because of low soil-water conditions. There was a positive relationship between high soil water and maximum population densities of T. acutoides in the spring and fall of 1984, and between low soil water and minimum population densities of the nematode in 1985 and 1986. Pratylenchus neglectus populations were affected by soil water, although to a lesser degree than the ectoparasitic nematodes. Population densities of the three nematode species were significantly lower in the drier years of 1985 and 1986 than in 1984. Nematode populations were greater at the lower soil depths in the fall than in the spring or summer.
在犹他州西部沙漠的五个冰草试验田中，研究了环境条件对植物寄生线虫种群动态的影响。在一项为期3年（1984 - 1986年）的田间研究中，土壤水分和温度影响了外寄生线虫尖锐针线虫和美洲剑线虫以及迁移性内寄生线虫忽视短体线虫在航道冠冰草（冰草）、“Hycrest”冠冰草（冰草×荒漠冰草）、“Rosana”西部冰草（史密斯披碱草）、“Oahe”中间冰草（中间偃麦草）和RS - 1杂交种（偃麦草×拟斯卑尔脱山羊草）上的种群动态。在1984年良好的植物生长条件下，收集到了这些线虫种类在土壤中的最大种群数量。1985年和1986年线虫种群数量减少，可能是由于土壤水分条件较低。1984年春季和秋季，土壤水分高与尖锐针线虫的最大种群密度之间存在正相关关系，而1985年和1986年土壤水分低与该线虫的最小种群密度之间存在正相关关系。忽视短体线虫种群受到土壤水分的影响，尽管程度小于外寄生线虫。1985年和1986年较干旱年份中这三种线虫的种群密度显著低于1984年。秋季土壤较深处的线虫种群数量比春季或夏季更多。
