连年与隔年秸秆深还对土壤物理性质及养分含量的影响OA北大核心CSTPCD

Corn stover deep incorporation is a new way of returning corn stover to the field in the past decade.Previous studies have focused on soil fertility effects of different successive years of sto-ver deep incorporation,but there is relatively little research comparing the two stover deep incorpora-tion methods of consecutive years and alternate years.Therefore,this experiment compared the ef-fects of two stover deep incorporation methods on soil physical properties,organic matter,and avail-able nutrients,with 3 times in three successive years and 1 concentrated returning in three years,un-der the same returning period(3 years)and total returning amount.For this reason,we designed four treatment methods:no corn stover incorporated(ck),full amount of stover deep incorporation for 3 successive years(CS-3A),double amount of stover deep incorporation for 3 successive years(2CS-3A),and triple amount of corn stover deep incorporation at an interval three years(3CS-G3A),and studied the changes in soil physical properties,soil organic matter,and available nutrient content.The results showed that the reduction effects of the treatments of successive and every other years of deep stover returning on soil bulk density and compactness gradually weaken with the increase of the returning period,and each treatment can increase soil organic matter and nutrient content.Compared with ck,surface and subsurface alkaline hydrolysis nitrogen,available phosphorus and available po-tassium in CS-3A treatment increased by 12.90%-14.54%,27.53%-34.80%,10.45%-13.99%,and 28.24%-29.57%,26.28%-34.42%and 21.71%-26.22%,respectively.Surface and subsurface lay-ers in 3CS-G3A treatment increased by 3.21%-6.43%,5.33%-21.72%,0.80%-3.71%,and 11.02%-23.34%,4.35%-24.35%and 4.24%-15.82%,respectively.And CS-3A treatment increased SOC the most,with surface and subsurface layers increased by 16.9%-18.9%and 19.2%-20.6%,re-spectively,compared with ck.On the whole,the effect of CS-3A treatment on soil fertility is better than that of 3CS-G3A treatment within 3 years.