Study on Survival Regions of Plant Species in Middle-Lower Reaches of Heihe River
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摘要: 基于对地境和根群的认识, 从系统论的角度首次提出了植物物种地境稳定层及生存域概念, 运用多种理化指标的组合状态对黑河中下游多年生植物物种地境稳定层层位进行了确定, 深度范围为40~100 cm.根据各典型植物物种地境稳定层的水土条件相应地圈划了它们的生存域, 并提出了黑河下游地区植被分布与地境关系的一些新认识.Abstract: Based on systematology and the recognition to underground environment and root mass, the paper submits the conception of plant species stable layer in underground habitat and survival regions for the first time. Then from different aspects, the paper determines the depth range of plant species stable layer in underground habitat for perennial plant in middle-lower drainage of Heihe River, and the depth range is between 40 and 100 cm.By the connection of growth statusof representative species and the water and soil codition of plant species stable layer in underground habitat, the paper adumbrates survival regions of various species and acquires some recognition from the figure of survival regions of species as well as the superposed figure of all survival regions.
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图 1 各物种的生存域
数字表示调查的样地号, 带括号的样地号是与该样地对比的点, 一个样地有2个样坑的, 在样号后加括号并用数字作了标明
Fig. 1. Survival regions of various species
表 1 不同土壤层位中各因子的最低、最高值比较
Table 1. Comparison between the lowest and the highest value of various factors in different soil layers
表 2 不同土壤层位中各因子利于植物生存的样地百分率
Table 2. Percentage of plots favourable plant growth in different soil layers and different factors
表 3 各土壤层深度与对应的H2O2酶峰值点数
Table 3. Comparison between various soil layers and corresponding plot numbers of catalase peak value
表 4 不同植物在各样地地境稳定层中土壤水吸力、有机质、含盐量状况统计
Table 4. Status statistics of soil water suction, organic matter, salinity in stable layer of underground environment of different plants in each plot
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