喀斯特山区不同母质林地土壤环境质量评价

The soil environment quality of woodland with different parent materials(limestone,dolomite limestone,limestone shale,dolomite,limestone sand inclusion shale) in Kasta mountain area was assessed with Analytic Hierarchy Process and Principal Component Analysis methods.The results indicated that the soil fertility quality of the soil developed from limestone shale was the best,and the soil developed from dolomite limestone was the worst.The soil developed from limestone shale showed the best heavy metals quality,and the soil developed from dolomite was the worst.The soil developed from limestone shale had the best stand condition quality,and the soil developed from limestone sand inclusion shale was the worst.The results also showed that the order of the soil environment quality was: limestone shale>limestone>dolomite limestone>dolomite>limestone sand inclusion shale.

喀斯特山区冬小麦施肥量与产量的关系

采用三因素饱和D-最优设计方案，研究黔西县大关镇冬小麦施肥量与产量之间的数量关系。结果表明，小麦产量随有机肥的施用量的增加而增加，呈线性相关关系。在一定的范围内，施用氮肥、磷肥有增产作用，当氮、磷施用量过高时产量下降，氮、磷的施用量与小麦产量呈抛物线关系；施用有机肥和磷肥对小麦产董有显著作用，而氮肥的施用置不宜过多。其适宜的有机肥施用量为600-750kg／667m^2，尿素施用量9～12kg／667m^2，普钙施用量20-42kg／667m^2。