黄土丘陵区人工林地土壤肥力评价

Soil fertility evaluation of planted forest land on the hilly-gullied Loess Plateau

就黄土丘陵区人工林地土壤肥力状况进行了综合评价。结果表明,全氮、碱解氮和有机质是黄土丘陵区人工林土壤主要的肥力指标,其含量能更好地反映土壤肥力状况。利用年限小于10年的土壤肥力处于很低的水平,利用年限在10～20年间的土壤肥力处于较低水平,利用年限在20年以上的土壤肥力接近中等水平。黄土丘陵区人工林土壤养分中除全磷和速效钾外,其它养分含量均偏低,该区人工林土壤肥力总体水平偏低。

In this paper the soil fertility status of planted forest land was integrated evaluated on the hillygullied Loess Plateau.The results showed that total nitrogen,available nitrogen and organic matter were the main fertility indicators for soil fertility evaluation in the planted forest land on the Loess Plateau.The content of these indicators could better reflect the soil fertility.The soil fertility of planted forest land with landuse year less than 10 years and between 10 to 20 years was in the very low grade and low grade respectively.However,the fertility was of planted forest land with landuse year more than 20 years was close to the middle grade.On the hillygullied Loess Plateau,all the nutrients content was lower except total phosphorous and available potassium.The soil fertility of planted forest land in the region was on the low side as a whole.