摘要
研究复垦后不同施肥措施下有机碳(OC)和全氮(TN)在水稳性团聚体及粉黏粒组分中的分布特征,以期深入理解不同施肥措施下土壤有机碳的固持机制。以生土和连续6年不同施肥措施的复垦土壤为研究对象,采集0~20 cm耕层土壤样品,利用湿筛法进行土壤粒径分组,分析大粒径大团聚体(>2 mm)、小粒径大团聚体(>0.25~2 mm)、微团聚体(0.053~0.25 mm)和粉黏粒组分(<0.053 mm)中OC和TN含量,判断各粒径团聚体及粉黏粒组分中有机碳储量的驱动因素,探究团聚体及粉黏粒组分中有机碳含量与作物产量之间的关系。试验设不施肥(CK)、施氮磷钾化肥(NPK)、单施有机肥(M)和有机无机肥配施(MNPK)4个处理。结果表明:1)整个试验周期(2008—2013年),同CK相比,NPK、M以及MNPK处理均显著提高了玉米籽粒产量,且以MNPK处理的效果最显著,分别提高了79.49%、116.07%和113.85%。2)大团聚体和微团聚体中OC和TN含量相近,总体高于粉黏粒组分。同生土相比,CK、NPK和M处理均显著提高了>0.25~2、0.053~0.25 mm团聚体和<0.053 mm组分中OC含量。MNPK处理显著提高了各粒径团聚体和<0.053 mm组分中OC含量。此外,CK、NPK、M和MNPK处理均显著提高了各粒径团聚体中TN含量;大团聚体和微团聚体中有机碳和全氮富集系数相近,总体高于粉黏粒组分。M以及MNPK处理均显著提高了各粒径团聚体及粉黏粒组分(除>2 mm团聚体外)的C/N比。3)土壤有机碳储量受>2 mm团聚体的百分比数量驱动,其余各粒径团聚体及粉黏粒组分中有机碳含量对土壤有机碳储量的贡献较大。4)作物产量随着各粒径团聚体及粉黏粒组分中有机碳含量的增加呈线性增加,说明该区域土壤有机碳库仍未达到饱和,且以0.053~0.25 mm团聚体中有机碳含量与作物产量关系最紧密。因此,在采煤塌陷区的低肥力复垦土壤上采取有机无机肥配施,对土壤质量及农业生态持续性具有积极的作用�
This study aims to investigate the distribution characteristics of organic carbon(OC)and total nitrogen(TN)in water-stable aggregates,silt and clay fractions,in order to gain a deep understanding the sequestration mechanism of soil organic carbon(SOC)under various fertilization regimes.Topsoil samples(0-20 cm)were collected from the raw soil and reclaimed soil under different fertilization regimes of six consecutive ages.A wet sieving method was used to fractionate the particle size in soil,including the large macroaggregates(>2 mm),small macroaggregates(0.25-2 mm),microaggregates(0.053-0.25 mm),as well as the silt-and clay-sized fractions(<0.053 mm).The contents of OC and TN were analyzed for the water-stable aggregates,the silt and clay fractions.A systematic experiment was also carried out to reveal the driving factors for the changes of SOC storage,while,the relationship between crop yields and the OC content in the water-stable aggregates,the silt and clay fractions.Four treatments were selected,including no fertilizer(control,CK),nitrogen,phosphorus,and potassium fertilizer(NPK),single application of organic manure(M),and the combined application of organic manure and synthetic fertilizers(MNPK).The results showed that the contents of OC and TN were similar in macroaggregates and microaggregates,particularly higher than that in the silt and clay fractions.Compared with the raw soil,the CK,NPK and M treatments significantly increased the OC contents in the 0.25-2 mm,0.053-0.25 mm aggregates,and the<0.053 mm fractions,with the increase of 97.96%,66.19%and 97.60%(CK),87.07%,92.09%,92.80%(NPK),and 95.24%,148.20%,112.00%(M),respectively.The MNPK treatment significantly increased the OC contents in>2,0.25-2,0.053-0.35 mm aggregates,and the<0.053 mm fractions,with the increase of 151.88%,160.54%,135.25%,and 92.80%,respectively.In addition,the CK,NPK,M and MNPK treatments significantly increased the TN contents in>2 mm,0.25-2 mm and 0.053-0.25 mm aggregates,with the increase of 43.66%,46.78%,and 29.95%(CK),41.83%,5
作者
曹寒冰
谢钧宇
强久次仁
郭璐
洪坚平
荆耀栋
孟会生
Cao Hanbing;Xie Junyu;QiangJiu Ciren;Guo Lu;Hong Jianping;Jing Yaodong;Meng Huisheng(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China;Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province,Taiyuan 030031,China;Agriculture and Animal Husbandry Bureau in Shannan Cona County,Shannan 856700,China;Binzhou Academy of Animal Science and Veterinary Medicine of Shandong Province,Binzhou 256600,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2020年第18期135-143,共9页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(41807102,U1710255-3)
山西省高等学校科技创新项目(2019L0363)
山西农业大学科技创新基金(青年科技创新)项目(2019004)
山西省优秀博士来晋工作奖励(SXYBKY201805)资助。
关键词
复垦
土壤
水稳性团聚体
有机碳
全氮
作物产量
reclamation
soils
water-stable aggregates
organic carbon
total nitrogen
crop yield
