Effects of Tillage and Straw Returning on Glomalin and Soil Ecological Stoichiometric Characteristics
The effects of tillage and straw returning on glomalin-related soil protein(GRSP),ecological stoichiometric characteristics and their relationships were explored using farm soil for long-term crop produc-tion.The soil samples of 0～20-cm layer under three treatments of no tillage,only tillage and tillage with straw returning were collected and analyzed.The results showed that total glomalin(TG)content in no-tillage soil was 4.1 mg/g,which was 5.1％higher than that in tillage soil at significant level.The TG content in tillage with straw returning soil was increased by 3.6％compared to that in tillage soil.The easily extracted glomalin(EEG)in no-tillage and tillage with straw returning soils were increased by 4.8％and 6.1％compared with that in tillage soil.The soil organic carbon content of no-tillage and tillage with straw returning treatments were 17.58 mg/g and 17.89 mg/g respectively,which were 14.1％and 16.1％higher than that of tillage treatment and reached significant level.The total N content in no-tillage soil was 1.49 mg/g,which was significantly higher than that in tillage soil and tillage with straw returning soil with the increase amplitudes as 26.3％and 17.3％respectively.The soil C/N value in tillage with straw returning soil was 14.47,which was 33.2％signif-icantly higher than that in no-tillage soil.The soil organic carbon and total nitrogen contents affected the secre-tion and release of GRSP.No-tillage and tillage with straw returning were benefit to increasing soil organic car-bon and total nitrogen contents,so as to promote the secretion of GRSP.But long-term tillage could limit the secretion of soil GRSP by arbuscular mycorrhizal fungi.
TillageStraw returning to the fieldGlomalinSoil organic carbonTotal nitrogenTotal phosphorus
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