[关键词]
[摘要]
通过灌草群丛划分、土壤采样以及室内测定、数理统计等方法, 分析了黄河三角洲原生湿地灌草群落土壤的养 分、盐分分布特征及相互关系, 发现原生灌草群落土壤可溶性盐的垂直分布变异性较大, 其中, 碱蓬群丛与柽柳群丛 土壤可溶性盐分布具有较强的表聚性, 而土壤有机质含量表现为芦苇群丛> 柽柳群丛> 碱蓬群丛, 且灌草群落中土 壤C/ N 值都大于5, 表明其有机质腐殖化程度较高。另一方面, 土壤全氮与有机质存在明显的线性正相关; 而土壤 全盐与有机质、全氮之间存在明显的倒数关系, 表明全盐对二者的制约作用, 其中15~ 20 g/ kg 的土壤盐分范围对 应的是土壤全氮、有机质由迅速减少向缓慢减少的变化趋势。研究结果可以为盐碱土改良提供重要参考。
[Key word]
[Abstract]
The distributio n character istics of soil nut rient and soil salinity o f native shrub2herb communities in the Yellow River Delta w etland and their r elationship w ere investigated using the methods of shrub2her b association classificatio n, so il sampling , labor ator y analy sis, and mathematical stat istics. The results show ed ( 1) the v ertical var iatio n o f soil soluble salt differ s sig nifi2 cantly , and the distr ibution of soil salinity o f the Suaeda glauca asso ciatio n and Tamar ix chinensis associatio n show s the trend of surf icial accumulatio n; ( 2) the or der w ith high to low o f so il or ganic mat ter co ntent is Phragm ites communis association, Tamar2 ix chinensis association, and Suaeda g lauca asso ciatio n; ( 3) the C/ N rate o f the shrub2her b communities is hig her than 5, w hich sug gests high humificatio n degr ee of soil o rganic matter ; ( 4) soil to tal nit rog en has a positive co rr elation w ith or ganic matt er, while so il total salinit y has an inver se co rr elatio n w it h o rg anic mat ter and to tal nitr og en, which indicates the restr ictio n of to tal salinity on o rganic matter and total nit rog en; and ( 5) the soil sa linity range from 15 to 20 g / kg cor responds to the tr ansit ion for the r apid to slow r educt ion of so il to tal nitrog en and o rg anic matter. The r esults can pr ov ide reference for the impr ovement of saline soil.
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[基金项目]
国家自然科学基金( 40901276) ; 山东省优秀中青年科学家科研奖励基金( 2011BSB01256) ; 聊城大学创新项目( SF2013142)