土壤有机培肥对微团聚体组成及其碳,氮分布和活性的影响

本文通过田间试验研究了土壤有机培肥(ISFOM)对棕壤和黑土微团聚体组成及其碳、氮分布和活性的影响。并对本文所用的制备微团聚体的方法进行了评价。结果表明:①棕壤和黑土的优势粒级和次优势粒级分别为10～50μm和50～250μm,C、N分布一般为10～50μm>50～250μm≥0～5μm>5～10μm。②随粒级的增加,棕壤的碳活性(C_A)和氮活性(N_A)提高。③ISFOM后一般使50～250μm粒级含量、各级微团聚体的C_A和N_A增加。④在没有更好的方法以前,用沉降虹吸法制备微团聚体是可行的。

Effect of improving soil fertility by organic materials on the composition, C, N distribution and activity of microaggregates

The effects of improving soil fertility by organic materials(ISFOM) on the composition, C, N distribution and activity of microaggregates were studied with field experiments in Brown earth and Black soil. The method used in this paper for preparating microaggregates was also evaluated. The results were summarized as follows; 1, the dominant and secondary dominant partical sizes in the soils were 10-50 and 50-250|im, respectively. The C, Ndistribution in various partical sizes of microaggregates were generally in follow sequence: 10- 50>50 - 250^0- 5> 5-10|am fractions; 2, the carbon activity(CA)and nitrogen activity(NA)were increased with the increase of the partical size of microaggregates; 3, the content of 50-250|am partical size in microaggregates composition and the CA, NA of various sizes of microaggregates were basically increased after EJFOM; 4, the sedimentation siphonage method for preparation of microaggre-gates is available before a new method found.