植物营养与肥料学报2017，Vol.23Issue(1)：20-26,7.DOI:10.11674/zwyf.16095
长期施肥和秸秆覆盖土壤活性有机质及碳库管理指数变化
Effect of long-term fertilization and straw mulch on the contents of labile organic matter and carbon management index
摘要
Abstract
[Objectives] Effects of fertilization and straw mulch on the contents of soil labile organic matter and carbon management index were investigated to evaluate the sustainable straw mulch methods for Weibei rain-fed Highland of China.[Methods] A 28-year-long field experiment,located in Heyang County,Shaanxi Province since 1981,was used for the study.Five treatments were included in this experiment,neither fertilization nor straw mulch (CK),nitrogen and phosphate co-application (NP),nitrogen,phosphate and manure co-application (NPM),nitrogen and phosphate and straw mulch together (NP + FG),and nitrogen,phosphate and manure coapplication and straw mulch (NPM + FG).The contents of total organic matter,labile organic matter and soil nutrients and soil enzyme activities were measured.The contents of soil labile organic matter and carbon management index were studied.Further,their correlations with soil enzyme activities,soil nutrient contents were revealed.The contents of soil labile organic matter were measured using the KMnO4 oxidation method.[Results] 1) Compared with CK,the NP increased the content of high labile organic matter by 48.7％,and had no significant influence on other fractions of labile organic matter.The NPM increased the content of total organic matter by 120.0％,and increased the high-labile,middle-labile and low-labile organic matter by 137.4％,136.3％ and 93.4％,respectively.2) Taken the CK as reference soil,the high labile carbon management index (HCMI),mid-labile carbon management index (MCMI) and carbon management index (CMI) in the treatment NP were increased by 54.66,17.93 and 2.65,in the treatment NPM were increased by 139.28,140.92 and 83.59;taken NP as reference soil,those in the treatment NP+FG were by 75.01,191.43 and 122.90,and compared to NPM,those in the NPM+FG were by 58.93,121.35 and 93.43.3) All the three fractions of labile organic matter were very significantly correlated with total organic matter,HLOM and HCMI were very significantly correlated with the invertase activity,MCMI and CMI were significantly correlated with the invertase activity.Compared with total organic matter,labile organic matter could reflect the change of soil enzyme activities and soil quality more sensitively.[Conclusions] HCMI was affected by the NP application obviously,and HCMI,MCMI and CMI were affected by the NPM obviously.The effects of straw mulch on CMI were evident,being more evident under the condition of NP fertilization than under the condition of NPM fertilization.Straw mulch under the condition of NP fertilization could increase soil carbon management index and improve soil fertility better in Weibei rain-fed tableland of China.关键词
施肥/秸秆覆盖/活性有机质/碳库管理指数/长期定位试验Key words
fertilization/straw mulch/labile organic matter/carbon management index/long-term experiment引用本文复制引用
王改玲,李立科,郝明德..长期施肥和秸秆覆盖土壤活性有机质及碳库管理指数变化[J].植物营养与肥料学报,2017,23(1):20-26,7.基金项目
国家科技支撑计划项目(2015BAD22B0104) （2015BAD22B0104）
西北农林科技大学科技成果推广项目(TGZX2015-24) （TGZX2015-24）
山西省科技攻关项目(20140311008-5)资助. （20140311008-5）
