黄土丘陵区退耕地3种植被土壤养分研究

Research on soil nutrient of three returning farmland to forest vegetation in hilly region of Loess Plateau

通过对黄土丘陵区退耕地(阴坡)3种植被(沙棘、刺槐沙棘混交林地、油松沙棘混交林地)不同生长状况土壤养分研究,结果表明:(1)研究区土壤养分含量低;(2)研究区土壤养分中全氮、速效氮、速效钾、速效磷空间变异性显著;(3)研究区林地土壤养分含量从大到小顺序依次为沙棘(好)>刺槐沙棘林地(好)>沙棘(差)>刺槐沙棘林地(差)>油松沙棘林地(好)>油松沙棘林地(差),死亡的油松沙棘混交林地土壤养分含量好于生长好与生长差的油松沙棘混合林地。

Authors analysed shady slope soil nutrients in three returning farmland to forest vegetation （Hippophae rhamnoides, Hippophae rhamnoides＋Pinus tabulacformis, Hippophae rhamnoides＋Robina pseudoacacia） which were in different growth status in hilly region of Loess Plateau, the results showed： （1） The soil nutrients were very low in study area; （2） The spatial variation of total nitrogen, available nitrogen, available potassium, available phosphorus was obvious in study area; （3） The order of the soil nutrients in the study area from big to small was Hippophae rhcmmoides（good）〉Hippophae rhamnoides＋Robina pseudoacacia（good）〉Hippophae rhamnoides （bad） 〉Hippophae rhamnoides ＋Robina pseudoacacia （bad）〉Hippophae rhamnoides ＋Pinus tabulacformis （good）〉Hippophae rhamnoides ＋Pinus tabulacformis（bad）. The soil nutrient of Hippophcte rhamnoides＋Pinus tabulacformis （death） was better than good and bad one.