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作 者:李从娟[1] 唐俊姸 高培[3] 孙永强[1] 翟志忠[4]
机构地区:[1]中国科学院新疆生态与地理研究所,国家荒漠-绿洲生态建设工程技术研究中心,乌鲁木齐830011 [2]石河子大学农学院,新疆石河子832011 [3]新疆信息工程学校,乌鲁木齐830013 [4]国家林业局竹子研究开发中心,杭州310012
出 处:《土壤学报》2015年第5期1180-1187,共8页Acta Pedologica Sinica
基 金:国家自然科学基金项目(31300449);中国科学院西部博士专项(XBBS201205);新疆维吾尔自治区科技支撑项目(201433101)资助
摘 要:以塔克拉玛干沙漠公路沿线防护林植物及土壤为研究对象,综合研究成水灌溉对植物根系及风沙土演变的作用。结果表明,柽柳的根系较深,达到200cm,而梭梭和沙拐枣根系为100-150cm。林地表层土壤出现显著的土壤盐分(8mScm^-1)和养分聚集现象。但在植物根系分布最多的40~60cm的土壤层中并没有出现土壤盐渍化现象(〈1.0mScm^-1)。防护林地土壤养分含量显著高于流沙地,且土壤的黏粒和粉粒以及土壤团聚体和团聚体稳定性均显著增加。综上所述,地下咸水灌溉并未对植物的正常生长产生盐害或毒害,同时有利于沙漠风沙土的演变。Investigation were carried out of plant roots and soil in shelterbelts along highways in the Taklimakan to explore effects of irrigation with saline water on plant root system and evolution of aeolian sand soil in the shelter belts. Results showed that the roots of Tamarix go much deeper, about 200 cm into the soil, while those of Haloxylon and Calligonum about 100 ~ 150 cm; Soil salts (about 8 mS cm^-1 ) and nutrients accumulate significantly in the topsoil layer ( crust and 0 ~ 10 cm soil layers ) in sheherbelts irrigated with saline water, but in the 40 ~ 60 cm soil layer, where plant roots are densely distributed, soil salinization does not exist ( 〈1.0 mS cm^-1 ) . The soil in the shelterbelt is much higher than in shifting sand soil in content of soil organic C, total N and total P, and moreover, the soil is significantly higher in content of clay, silt and soil aggregates, which are relatively higher in stability than shifting sand soil. To sum up,irrigation with saline groundwater does not bring about any salt hazard or toxicity to plants growing normally in the shelterbelts, and instead it is conducive to evaluation of desert aeolian sand soil.
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