应用生态学报2024，Vol.35Issue(3)：695-704,10.DOI:10.13287/j.1001-9332.202403.012
长期免耕和秸秆覆盖量对黑土碳氮含量及碳氮循环相关酶活性的影响
Effects of long-term no-tillage and different stover mulching amounts on soil carbon and nitrogen contents and enzyme activities of carbon and nitrogen cycle in Mollisols
摘要
Abstract
To understand the effects of different stover mulching amounts in no-tillage on soil carbon and nitrogen contents and enzyme activities,finding a stover mulching amount which can meet the requirement of soil carbon and nitrogen accumulation while maximizing economic benefits,we conducted a long-term conservation tillage field ex-periment since 2007 in Mollisols area of Northeast China.We analyzed soil carbon and nitrogen contents,enzyme activities and economic benefits under conventional tillage(Control,CT),no-tillage without stover mulching(NT0),no-tillage with 33％ stover mulching(NT33),no-tillage with 67％ stover mulching(NT67),and no-tillage with 100％ stover mulching(NT100)before planting in May 2020.The results showed that compared with CT,NT0 did not affect soil organic carbon(SOC)and total nitrogen(TN)contents,but increased soil organic carbon recal-citrance and decreased the availability of dissolved organic nitrogen(DON)and ammonium nitrogen.Compared with NT0,no-tillage with stover mulching significantly increased SOC contents in 0-10 cm layer and increased with the amounts of stover.In addition,NT67 and NT100 significantly increased SOC stocks,facilitating the accumulation of soil organic matter.The effects of different stover mulching amounts on soil nitrogen content in 0-10 cm layer were different.Specifically,NT33 increased DON content and DON/TN,NT67 increased DON content,while NT100 increased TN content.Compared with CT,NT0 decreased peroxidase(POD)activity in 0-10 cm layer.Compared with NT0,NT33 increased β-glucosidase(βG),cellobiase(CB),1,4-β-N-acetylglucosaminidase(NAG),poly-phenol oxidase(PPO)and POD activities,while NT67 only increased CB,NAG and POD activities in 0-10 cm soil layer,both alleviated microbial nutrient limitation.NT100 increased PPO activity in 10-20 cm layer.NT33 in-creased carbon conversion efficiency of stover compared with NT100,and had the highest economic benefit.In all,no-tillage with 33％ stover mulching was the optimal strategy,which could promote nutrient circulation,boost stover utilization efficiency,improve the quality of Mollisols,and maximize guaranteed income.关键词
保护性耕作/秸秆覆盖量/土壤碳氮/土壤酶Key words
conservation tillage/stover mulching amount/soil carbon and nitrogen/soil enzyme引用本文复制引用
于洋,张常仁,杨雅丽,徐欣,吕付泽,郑甜甜,解宏图,鲍雪莲..长期免耕和秸秆覆盖量对黑土碳氮含量及碳氮循环相关酶活性的影响[J].应用生态学报,2024,35(3):695-704,10.基金项目
本文由国家自然科学基金项目(U22A20610,41977048)、黑土地保护与利用科技创新工程专项(XDA28090100)、辽宁省揭榜挂帅项目(2021JH1/10400039-2)和沈阳市科学技术计划项目(22-317-2-06)资助. （U22A20610,41977048）
