山地板栗园覆草效应的研究

连续5年对山地板栗园进行稻草覆盖试验,厚度为10cm、15cm和20cm。结果表明:三种厚度都能不同程度地提高板栗产量,土壤有机质,N、P、K含量以及浅层土壤根系数量;5年间年均增产1260～2352kg/hm2,相对增产幅度为41%～76%,土壤有机质含量增加18.1%～45.7%,水解氮、速效磷、速效钾含量分别增加55.2～93.1、4.2～12.5、37.5～103.1mg/kg,0～30cm土层土壤10.0mm以下根系数量增加50～177条。经济学评估表明:以覆草15cm厚度为宜,5年年均增产2100kg/hm2,年增加纯收入8610元/hm2,产投比为5.56。

Effects of Mulching on the Production of Chestnut Grown on the Moun tainous Soil

The five-year experiment results showed that covering chestnut plantation with straw was quite beneficial for chestnut(Castanea mollissima Bl.)grown on mountainous soil.No matter what covering thickness(10cm,15cm,20cm),the yield,the soil organic matter,N,P,K and the amount of roots,all could be increased.The average yield,the content of organic matter,hydrolytic N,available P,K,were increased by1260～2352kg/hm 2 ,18.1%～45.7%,55.2～93.1mg/kg,4.2～12.5mg/kg,37.5～103.1mg/kg respectively.In the meantime,the root number in the0～30cm topsoil was raised by50～177.Considering the economic value,the suitable covering thickness was15cm.The average yield and the net income were increased by2100kg/hm 2 and8610yuan/hm 2 .The value to capital investment ratio was5.56.