摘要
对中国科学院沈阳生态实验站潮棕壤水稻田、玉米地、撂荒地和人工林地4种土地利用方式经过14年后土壤电导率在土体10个土层中的剖面分布进行比较研究,结果表明:不同土地利用方式及不同深度土层土壤电导率差异显著。表层,玉米地土壤电导率显著低于其他3种土地利用方式;150 cm深度内土壤电导率平均值为林地>撂荒地>玉米地>水稻田。水稻田土层具有相对较高的土壤电导率,可能主要受植稻过程中土壤淋溶及复盐基作用的影响;林地深层相对较高的土壤电导率可能主要受树木根系分布的影响。不同土地利用方式下土壤剖面中电导率与有机C、全量N、P、S、有效态N、P、S、pH、交换性Ca、Mg、K、Na、CEC、DTPA浸提态Fe、Mn、Cu、Zn之间具有不同的相互关系,反映了不同土地利用方式下元素的生物地球化学循环对土壤电导率的影响。由此,土壤电导率可作为指征不同土地利用方式对土壤性质影响可行的土壤化学指标。表4,参13。
This study examined the dynamics and profile distribution of soil electrical conductivity （EC） in an aquie brown soil at the Sbenyang Experimental Station of Ecology, Chinese Academy of Sciences under four land use patterns. They are paddy field （PF）, maize field （MF）, fallow field （FF）, and woodland （WL） respectively, setting experiment over 14 years. In each pattern at the depth of 0 - 150era, soil samples were eoUected from ten layers. The results showed that soil EC was significantly different from each other under different land uses and at vari- ous depths. In the layer of 0 - 5era, soil EC was significantly lower in MF than in the other three land uses. The average value of soil EC at the depth of 0 - 150era was in the order of WL 〉 FF 〉 MF 〉 PF. The comparatively higher soil EC at the depth of 0 - 30 em in PF was probably due to the eluviation of bases and the rebasifieation in soil during the process of rice-planting, while the higher soil EC at the deeper layers in WL was the consequence of tree root distribution. There were different relationships between soil EC and soil organic C, total and available N, P and S, pH, exchangeable Ca, Mg, K and Na, and DTPA extractable Fe, Mn, Cu and Zn under different land uses, reflecting the influences of the biogeochemical cycling of under different land uses on soil EC dynamics. It is suggested that soil EC, as an easy measured soil chemical parameter, is effective to indicate the influences of land use on soil physiochemical property variations.
出处
《农业系统科学与综合研究》
CSCD
2007年第2期244-248,共5页
System Sciemces and Comprehensive Studies In Agriculture
基金
国家重点基础研究发展规划项目(2005CB121105)
辽宁省自然科学基金资助(20052013)
关键词
潮棕壤
土地利用
电导率
营养元素
生物地球化学
aquic brown soil
land use
electrical conductivity
nutrient element
biogeochemistry
