干旱地区农业研究2017，Vol.35Issue(1)：97-102,6.DOI:10.7606/j.issn.1000-7601.2017.01.15
长期定位施肥对旱作农田土壤有机碳及其组分的影响
Effect of long-term fertilization on soil organic carbon and its fractions under dryland farming system
摘要
Abstract
A long-term winter wheat field experiment was conducted to detect the effect of long-term fertilization on soil organic carbon and its active fractions .Four treatments were performed as control treatment (CK),nitrogen and phosphorus combined fertilization (NP),nitrogen,phosphorus and manure combined fertilization (NPM)and bare land without fertilization and cropping (BL).The results showed that the contents of soil organic carbon content,microbial biomass carbon content,potential mineralized carbon and carbon management index at 0~30 cm soil layers were im-proved in NPM than in CK after 30-yr continuous fertilization,being 42 .2%、55 .9%、40 .9%and 40 .0%higher,re-spectively .No significant difference in soil organic carbon and microbial biomass carbon were found between NP and CK, howerver,the potential mineralized carbon content and carbon management index were significantly higher in NP than in CK.The effect of long term fertilization on soil active organic carbon fractions was more obvious at 15~30 cm soil layers than at 0~15 cm layers .No cropping reduced the contents of soil organic carbon and its fractions significantly .Soil car-bon potential mineralization was lower by 20 .5%in BL than in CK,respectively .Correlation analysis showed that soil organic carbon,potential mineralization carbon,microbial biomass carbon and carbon management index correlated with each other significantly .Soil organic carbon changed in agreement with its fractions for all treatments except for NP,and the relative contents of two active organic carbon and its potential mineralization ratio of microbial biomass carbon were not significant among treatments .In general,continuous long-term manure addition can effectively increase soil organic carbon and its active fractions,contributing to soil fertility and carbon sequestration under dryland farming systems .关键词
长期施肥/土壤有机碳/微生物量碳/潜在矿化碳/碳库管理指数Key words
Long-term fertilization/soil organic carbon/potential carbon mineralization/microbial biomass carbon/carbon management index分类
农业科技引用本文复制引用
赵丹丹,王俊,付鑫..长期定位施肥对旱作农田土壤有机碳及其组分的影响[J].干旱地区农业研究,2017,35(1):97-102,6.基金项目
国家自然科学基金 （）
