连续不同施肥对土壤团聚体影响的研究

ttttt目的ttttt探讨不同生物炭添加对山原红壤团聚体结构的影响。ttttttttttttt方法ttttt以山原红壤(CK)为对照，选用不同比例的秸秆生物炭(0、1%和1.5%)，添加到施用相同量猪粪的山原红壤中，研究山原红壤团聚体结构的改变。ttttttttttttt结果ttttt与CK相比，随着生物炭量的增加，>0.25 mm水稳性团聚体的含量(WSA_0.25)和>0.25 mm机械稳定性团聚体的含量(MSA_0.25)分别增加了26.15%、30.45%和31.48%，10.11%、10.32%和10.59%；土壤团聚体平均质量直径(MWD)则分别降低20.41%、4.08%和3.06%，但炭粪处理的MWD值和CK差异不显著；土壤团聚体破坏率(PAD)分别显著降低了18.03%、22.57%和22.55%；水稳性团聚体分形维数(D)分别降低到2.70、2.69和2.68；通过分形维数和>0.25 mm团聚体含量的回归分析以及土壤有机质和WSA_0.25的相关分析，分形维数和土壤有机质用于表达土壤团聚体含量和稳定性是合理的。tttttttttttttttttt结论ttttt生物炭和猪粪配施显著提高了土壤水稳性团聚体的含量和稳定性。tttt

Aggregate structure and carbon,nitrogen, and phosphorus in native and cultivated soils

tttttPurposetttttThe effects of straw biochar amendment of different amounts on the structure of aggregates in mountain red soil were revealed in this study.tttttttttttttMethodtttttThe different proportions (0, 1% and 1.5%) straw biochar as an additive was selected and added to mountain red soil with pig manure application under organic planting as the original red soil control (CK). And the aggregate structure of treatments was tested.tttttttttttttResulttttttCompared with CK, the contents of water and mechanical stable aggregates greater than 0.25 mm (WSA_0.25 and MSA_0.25) with the increasing amount of straw biochar addition evidently increased by 26.15%, 30.45% and 31.48%, 10.11%, 10.32% and 10.59%, respectively in three treatments, while the mean weight diameters of aggregates (MWD) obviously decreased by 20.41%, 4.08% and 3.06%, respectively. There was no significant difference between CK and couples of biochar and pig manure application, but the percentages of aggregate destruction (PAD) significantly decreased by 18.03%, 22.57% and 22.55%, and the fractal dimensions of water-stable aggregates (D) in soils separately decreased to 2.70, 2.69 and 2.68. Investigations of regression relations between fractal dimensions and contents of aggregates greater than 0.25 mm and correlation relations between soil organic matter and WSA_0.25 clarified that the fractal dimension and soil organic matter were more reasonable choices for showing contents and stability of soil aggregates.ttttttttttttttttttConclusiontttttIt is suggested that there is a significant improvement on contents and stability of soil aggregates under straw biochar with pig manure application.tttt