摘要
【目的】探索有利于赤红壤碳库管理的滴灌施氮模式。【方法】通过模拟滴灌系统的盆栽试验,研究了3种滴灌方式和5种施氮处理对土壤有机碳和活性有机碳含量、碳库管理指数和酶活性的影响。【结果】与N0-CDI(土壤施氮量为0结合常规滴灌)相比,N2-ADI(滴灌施氮量0.18 g·kg–1结合交替滴灌)处理土壤有机碳含量提高55.2%,土壤活性有机碳含量提高111.8%,土壤碳库管理指数提高90.5%。同时,土壤有机碳含量、活性有机碳含量和碳库管理指数与过氧化氢酶、脲酶和转化酶活性之间有显著相关性。【结论】滴灌施氮量0.18 g·kg–1结合交替滴灌处理是赤红壤碳库管理的最优滴灌施氮模式。
【Objective】To explore the drip nitrogen fertigation strategy that is beneficial for carbon pool management in latosolic red soil.【Method】Pot experiments imitating the fertigation system were conducted.The effects of three drip irrigation methods and five nitrogen treatments on the contents of organic carbon and active organic carbon,carbon pool management index and enzyme activity in soil were investigated.【Result】Compared with N0-CDI(The amount of nitrogen applied to soil was 0,combined with conventional drip irrigation),N2-ADI(The amount of drip nitrogen fertigation was 0.18 g·kg^-1,combined with alternate drip irrigation)increased soil organic carbon content by 55.2%,soil active organic carbon content by 111.8%and carbon pool management index by 90.5%.Meanwhile,the organic carbon content,active organic carbon content and carbon pool management index significantly correlated with catalase,urease and invertase activities in soil.【Conclusion】The drip nitrogen fertigation of 0.18 g·kg^-1 combined with alternate drip irrigation is the optimal drip nitrogen fertigation strategy for carbon storage management in latosolic red soil.
作者
杜爱林
傅丰贝
李伏生
DU Ailin;FU Fengbei;LI Fusheng(College of Agriculture, Guangxi UniYersity/ Guangxi Academician Work Station of the New Technology of Water-saving Agriculture in Karst Region/Guangxi Colleges and Universities Key Laboratory of Crop Cultivation and Tillage, Nanning 530005, China)
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2019年第2期14-20,共7页
Journal of South China Agricultural University
基金
国家自然科学基金(51469003)
广西科技计划项目(桂科AD17195060)
关键词
滴灌施氮
赤红壤
土壤酶活性
土壤有机碳
碳库管理指数
drip nitrogen fertigation
latosolic red soil
soil enzyme activity
soil organic carbon
carbon pool management index