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2003 年11 月,在中国科学院沈阳生态实验站潮棕壤经过不同利用方式后对水稻田、玉米地、撂荒地和林地开展了植物线虫垂直分布(0–15 cm 各土层)特征研究。研究结果表明:不同土地利用方式下的某些优势属线虫随着土壤深度增加而呈下降趋势。螺旋属(Helicotylenchus)线虫是4 种土地利用方式中最优势的属。水田丝尾属(Filenchus)、平滑属(Psilenchus)和垫刃属(Tylenchus)线虫主要分布在上层(0–20 cm),而撂荒地、林地中的针属(Paratylenchus)线虫及玉米地中的短体属(Pratylenchus)线虫能够分布在更深的土层(0–80 cm)。本研究揭示,植物线虫优势属数量与土壤化学特性指标存在显著相关关系。不同利用方式螺旋属线虫数量与土壤C/N 比、全碳、全氮、全磷、碱解氮及Olsen-P含量呈显著正相关;水田丝尾属和平滑属线虫、玉米地短体属线虫、撂荒地针属线虫与土壤pH 程显著负相关,与土壤全碳、全氮及碱解氮呈显著正相关。为了更正确地评价植物线虫种群数量,有必要根据植物线虫优势属的垂直分布特征来确定取样深度。图1 表1 参21。
In November 2003, characteristics of vertical distribution of plant nematodes (0-15 cm soil layer) in paddy field, corn field, wasteland and woodland were studied after different utilization methods of tidal brown soil at Shenyang Ecology Experimental Station, Chinese Academy of Sciences. The results showed that some dominant species of nematodes under different land use patterns showed a decreasing trend with the increase of soil depth. Helicotylenchus is the most dominant genera of the four land use patterns. Filenchus, Psilenchus and Tylenchus nematodes are mainly distributed in the upper layer (0-20 cm), while in the fallow fields, the Paratylenchus nematodes in the forest and in the maize Pratylenchus nematodes can be distributed in deeper soil layers (0-80 cm). This study revealed that there is a significant correlation between the number of dominant species of plant nematodes and soil chemical properties. There was a significant positive correlation between the number of Helicotids and soil C / N ratio, total carbon, total nitrogen, total phosphorus, basic nitrogen and Olsen-P content in different ways of utilization. In the paddy field, The nematodes and destructive land needles were negatively correlated with the soil pH and had a significant positive correlation with soil total carbon, total nitrogen and available nitrogen. In order to evaluate the number of plant nematodes more correctly, it is necessary to determine the depth of sampling based on the vertical distribution of dominant species of plant nematodes. Figure 1 Table 1 Reference 21.