Effect Of Deep Applied Corn Stalks On Composition And Structure Of Humus

Soil, as a natural resource essential to human survival, can provide people with food andfiber they need in their daily life and production. In recent years of rapid economic development,people over-exploit the land and apply irrationally fertilizers, thus triggering a series ofproblems, like land degradation, reduced grain output, food security and so on, which in turnthreatens sustainable development of the human society. Therefore, soil amelioration hasbecome a problem attracting extensive concerns and discussions the world over. Soil organicmatter is a key factor of fertile farmland and humic substances are important components oforganic matter and considered to be the most abundant organic ingredients of the nature, andthey play a critical role in the ecosystem. Humic substances can be classified, according to theirsolubility, into humic acid (HA), fulvic acid (FA) and humin (Hu). Straw is a kind of rich andbeing most likely used of renewable resources, the soil are need of fertilizer and agriculturalmechanization level in an emergency, Straw buried deeply can improve soil fertility and increasesoil organic matter, promoting agricultural production and it is one of the important methods toguarantee people’s lives. The humus composition modification method is adopted in this paper,the research on influence of organic carbon in the various components of the humus, and extractsolid samples of the humic acid (HA) and humin (Hu), using the elements analysis, differentialthermal analysis and infrared spectral analysis for structure characterization. The results are asfollows:(1)For black soil and brown soil, After processing of CK and CS experiment lead to contentof organic carbon in the surface layer of the soil were greater than the subsurface layer, afterdeep applied corn stalks content of organic carbon increased1.5565%～33.11%an. content oforganic carbon in the surface layer of soil lower than CK.(2)For brown soil and black soil, after deep applied corn stalks content of organic carbon inthe WSS of surface and subsurface layer of the soil both increased, contents of organic carbon ofFA, HA and Hu in the surface all had different degrees of rising, contents of organic carbon ofFA, HA and Hu in the subsurface all declined slightly.(3)For black soil, after deep applied corn stalks PQ increased in the subsurface and surfacelayer of the soil; But for tide brown soil, PQ rose slightly in the surface of the soil, PQ fellslightly in the subsurface of the soil.(4)For the black soil,after deep applied corn stalks the molecular structure of HA in the straw developed in the complicated direction, degree of condensation is much bigger, rates ofstructure of aromatic or elements high temperature heating was rising. thermal stability was alsorelatively improved; For tide brown soil,after deep applied corn stalks, the molecular structureof HA in the straw develop in the complicated direction, degree of condensation were muchbigger, and aromatic structure or proportion of high temperature heating component increasedand the thermal stability improved.(5)For tidal brown soil, after deep applied corn stalks the condensation degree of Hu in thesurface and subsurface of the soil lessened.