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作 者:孙铁军[1] 滕文军[1] 王淑琴 杨凤华 武菊英[1]
机构地区:[1]北京市农林科学院北京草业与环境研究发展中心,北京100097 [2]北京市延庆县林业局,北京102100
出 处:《山地学报》2007年第5期596-601,共6页Mountain Research
基 金:国家科技攻关计划项目(2004BA617B02);北京市科技新星计划(B类)项目(2005B02)资助。~~
摘 要:试验在客土回填后的山地荒沟,设置紫花苜蓿草地试验区,连续2 a研究紫花苜蓿种植对客土理化性质的影响,结果得出:自然条件下,春季播种紫花苜蓿,可以加速山区荒沟植被恢复,改善客土理化性质,播种后第2 a,地上生物量与覆盖度达到最高,分别为2 1.5 kg/hm^2和74.1%,0~10 cm土层中pH值明显降低,土壤速效钾相对增加,全氮、碱解氮含量显著提高,达到0.657 g/kg与39.54 mg/kg;播种后第3 a,10~20 cm土层内土壤容重显著减小,达1.241 g/cm^3,总孔隙度显著提高,5.0~17.5 cm土层土壤紧实度显著降低,同时,0~10 cm土层速效磷含量下降速度相对减缓,有机质含量显著升高,达到9.253 g/kg。Studies on Alfalfa in the barren ravine were conducted with the foreign-soil physical and chemical characters in two years. There were good changes on the foreign-soil physical and chemical characters and the vegetation in there years after Alfalfa seeded in the spring, 2003. Aboveground biomass and coverage of Alfalfa were the highest with 2 811.5 kg/hm^2 and 74.1% on the second year after seeding. At the same time, pH descended significantly, and available potassium improved appreciably in the 0 - 10 cm. Meanwhile, total nitrogen and available nitrogen rose significantly to 0. 657 g/kg and 39.54 mg/kg. In three years after seeding, soil bulk density was the least with 1. 241 g/cm^3 in the 0 - 10 cm on the third year. Soil porosity increased in the 0 ~ 10 cm and soil compaction descended obviously in the 5.0 - 17.5 cm. Soil organic matter rose obviously to 9. 253 g/kg, and available phosphorous descended more slowly in the 0 - 10 cm on the third year due to Alfalfa planting.
分 类 号:S156[农业科学—土壤学] S54[农业科学—农业基础科学]
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