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[目的]揭示河北省坝上地区低山坡地不同坡向和坡位小叶锦鸡灌丛沙堆土壤理化性质变化规律,为坡地草地生态环境稳定提供理论依据。[方法]基于对山坡638个灌丛沙堆野外测量和86个室内土样分析的数据,运用地统计学和样品室内分析的方法。[结果](1)从低山坡脚到坡顶,灌丛沙堆pH值、粗砂、中砂和细砂总含量逐渐减少,粉砂、极细砂逐渐增加;有机质、全氮和全磷含量逐渐增加。(2)迎风坡不同坡位上灌丛沙堆表面颗粒中粗砂、中砂、细砂总含量大于背风坡相同坡位,极细砂和粉砂小于背风坡相同坡位。表面的土壤养分(有机质、全氮和全磷)为迎风坡坡脚大于背风坡坡脚,迎风坡坡中和坡顶的灌丛沙堆土壤养分含量小于背风坡坡中和坡顶灌丛沙堆,但是pH值变化与灌丛沙堆养分变化趋势相反。[结论]受坡位和坡向的影响,灌丛沙堆土壤理化性质空间分布具有一定的差异性。
[Objective] The study aimed to reveal the variation law of soil physico-chemical properties of Caragana microphylla shrubs in different slope and slope in Bashang region of Hebei Province, and provide theoretical basis for the ecological environment stability of the grassland. [Method] Based on the data of field survey and 86 indoor soil samples of 638 scrubs on hillside, the methods of geostatistics and sample indoor analysis were used. [Result] (1) From the foot of low hill to the top of slope, the total content of grit sand, sand and fine sand decreased gradually and the silt and fine sand increased gradually. The content of organic matter, total nitrogen and total phosphorus Content gradually increased. (2) The total content of coarse sand, medium sand and fine sand on the surface of the shrubbery on different slope positions on the windward slope is greater than the same slope position on the leeward slope, and the fine sand and silt are smaller than the same slope position on the leeward slope. Soil nutrients (organic matter, total nitrogen and total phosphorus) on the surface were larger on the windward slope than on the leeward slope. The soil nutrient content of the shrubbery in the mid-windward slope and the top of the slope was less than that on the leeward slope and the top of the slope However, the change of pH value is contrary to the change of nutrients in shrubs. [Conclusion] The spatial distribution of soil physical and chemical properties in the shrubbery pile was affected by slope position and slope aspect.