论文部分内容阅读
以1990年建立的耕作制定位试验田紫色土为研究对象,分析了常规中稻-冬水田平作(CF)、中稻-冬水田垄作免耕1(RNT1)、中稻-小麦或油菜垄作免耕2(RNT2)和中稻-小麦或油菜水旱轮作(CR)等耕作方式对紫色土剖面不同形态无机磷分布演变特征的影响.结果表明,与试验前土壤相比,长期不同耕作处理的土壤上下层全磷、有效磷和各形态无机磷均有不同程度的增加,各处理土壤中不同形态无机磷含量大小顺序为RNT2>CF>CR>RNT1.除了Fe-P含量下层土壤高于上部耕层外,Ca_2-P、Ca_8-P、Al~-P、Ca_(10)-P、O-P都表现为耕层高于下层的特征.不同耕作措施对紫色土剖面各形态无机磷含量影响显著,对各形态无机磷有效性影响效果为CR>RNT>CF.长期水旱轮作更有利于作物对磷的吸收.相关分析表明各组分无机磷对紫色土有效磷的贡献为Ca_2-P(0.936 9)>Al~-P(0.915 8)>Ca_8-P(0.901 2)>Fe-P(0.828 7)>Ca_(10)-P(0.805 9)>O-P(0.747 2).
Taking purple soil as the target location for cultivation in a farming system established in 1990 as the research object, the effects of RNT1, RNT1, RNT2, ) And middle-rice-wheat or rapeseed (CR) on the evolution and distribution of different forms of inorganic phosphorus in purple soil profiles were studied.The results showed that compared with the pre-test soil, , Available phosphorus and various forms of inorganic phosphorus increased to varying degrees, the order of the different forms of inorganic phosphorus in all treatments was RNT2> CF> CR> RNT1. Except that the content of Fe-P in the lower soil was higher than that in the upper layer, -P, Ca_8-P, Al ~ -P, Ca_ (10) -P and OP all showed the characteristics of tillage layer being higher than the lower layer.Under different tillage measures, it had a significant effect on the inorganic phosphorus content of purple soil section, The effect of phosphorus availability was CR> RNT> CF. The long-term rotation of water and soil was more beneficial to the absorption of phosphorus by crops.The correlation analysis showed that the contribution of each component of inorganic phosphorus to available phosphorus in purple soil was Ca 2 -P (0.936 9)> Al ~ -P (0.915 8)> Ca_8-P (0.901 2)> Fe-P (0.828 7)> Ca_ (10) -P (0.805 9)> OP (0.747 2).