藏东南地区农业示范园区设施果蔬土壤肥力特性研究

分析藏东南地区农业示范园区设施果蔬土壤有机质、全氮、碱解氮、硝态氮、速效磷、速效钾、土壤酸碱度在不同土层、不同棚龄的累积状况。结果表明：大棚土壤肥力与大田有很大差别,且随着大棚种植年限的增加均有不同程度的增长;大棚有机质、全氮、速效磷含量增加1倍;土壤碱解氮增加2倍,次层土壤硝态氮增加近10倍;土壤速效钾在表层增加;土壤pH逐年下降,有酸化的趋势。

Research on Soil Fertility Characteristics for Facilities Fruit and Vegetable at South-East Tibetan Agriculture Demonstration Park

The soil contents of the land for growing field crops and accumulation status including soil organic matter,total nitrogen,alkali solution nitrogen, NO3——N,available phosphorus,rapidly-available potassium,soil pH of different soil layer and the different age tent at the south-east Tibetan agriculture demonstration park were studied.The results showed that the soil fertility difference between plastic tents and the land for growing field crops was apparent.The soil fertility could be increased as long as the plastic tents years of planting increased.The content of soil organic matter,total nitrogen and rapidly-available potassium became twice at the plastic tents.The alkali solution nitrogen content increased twice as much.The NO3——N content of sub-layer soil increased nearly 10 times.The soil rapidly-available potassium content in surface also increased.The soil pH declined year by year and had the trend of the acidification.