浙江农林大学学报2024，Vol.41Issue(4)：760-768,9.DOI:10.11833/j.issn.2095-0756.20230522
喀斯特农田土壤呼吸对干湿交替的响应特征
Response of soil respiration to dry-wet alternation in karst farmland
摘要
Abstract
[Objective]The objective of this study is to explore the response of soil CO2 emission flux from calcareous soil to frequent dry-wet alternation in farmland of karst areas in southwest China.[Method]Taking calcareous soil in karst farmland as the research object,two dry-wet alternation intensities(simulated precipitation of 10 and 25 mm)were designed,with a dry-wet alternation cycle of 10 days as one cycle process,to investigate the response of soil respiration to dry-wet alternation in karst farmland.[Result]The intensity of dry-wet alternation significantly affected soil CO2 emission flux and total soil CO2 emissions(P＜0.05).Under two different dry-wet alternation intensities,soil CO2 emission flux reached its maximum shortly after water was applied,and then gradually decreased.For the 10 mm dry-wet alternation intensity,there was no significant difference between soil CO2 emission flux and total soil CO2 emissions under different cycles.However,for the 25 mm dry-wet alternation intensity,the difference between soil CO2 emission flux and total soil CO2 emissions under most cycles was significant(P＜0.05).Correlation analysis revealed that the correlation between soil water content and soil CO2 emission flux decreased continuously under the multiple cycles of dry-wet alternation.[Conclusion]The intensity and process of dry-wet alternation are important factors affecting soil respiration release in karst farmland.[Ch,5 fig.1 tab.64 ref.]关键词
喀斯特农田/土壤呼吸/干湿交替/响应Key words
karst farmland/soil respiration/dry-wet alternation/response分类
农业科技引用本文复制引用
吕文强,董天燕,白富文..喀斯特农田土壤呼吸对干湿交替的响应特征[J].浙江农林大学学报,2024,41(4):760-768,9.基金项目
国家自然科学基金资助项目(42071142) （42071142）
贵州师范学院2021年度校级科学研究基金博士项目(2021BS023) （2021BS023）
