广西师范大学学报（自然科学版）2024，Vol.42Issue(4)：216-228,13.DOI:10.16088/j.issn.1001-6600.2023120301
亚热带森林不同类型土壤净氮转化对温度和湿度的响应
Responses of Net Nitrogen Transformation to Temperature and Moisture in Different Types of Subtropical Forest Soils
摘要
Abstract
In order to study the response mechanism of soil net nitrogen(N)transformation rates to temperature and moisture in subtropical forests,the study focused on two kinds of subtropical forest soils,an acidic red soil and a neutral limestone soil,which were widely distributed in Guangxi.Soil incubation experiments were conducted to compare the responses of net ammonification,nitrification,and N mineralization rates to different soil temperature(5,15,25,35 ℃)and moisture levels(20％,40％,60％,80％water holding capacity,WHC).The results showed that net N transformation rates of both soils responded strongly to temperature changes.The net ammonification,nitrification and N mineralization rates of red soil decreased with increasing temperature,leading to a decrease in soil net N supply capacity.Conversely,the net nitrification and mineralization rates in limestone soil increased with increasing temperature,thereby increasing the bioavailable N flux as well as the risk of soil nitrogen leaching.Temperature sensitivity values(Q10)of soil N transformations indicated that the sensitivity temperature range of net ammonification and N mineralization rates of acidic red soil was 25 to 35 ℃.The sensitivity range of nitrification rates of red soil and net N transformation rates of limestone soil was 15 to 25 ℃.The increase of soil moisture promoted net nitrification and mineralization rates of limestone soil,but had no significant effect on the net N transformation rates of red soil.Soil calcium content had the highest explanatory rate(28.0％)in predicting N transformation rates at different temperatures.In conclusion,it is crucial to consider the varying responses of N cycling among different soil types to climate change in forest conservation,restoration and land use management of subtropical forests under the global change.关键词
森林土壤/氮转化/氮矿化/硝化/温度/湿度/响应/Q10Key words
forest soil/nitrogen transformation/nitrogen mineralization/nitrification/temperature/moisture/response/Q10分类
农业科技引用本文复制引用
李顺利,何枢浩,陈荣枢,罗翠颖,江宸羊,梁建宏,朱婧..亚热带森林不同类型土壤净氮转化对温度和湿度的响应[J].广西师范大学学报（自然科学版）,2024,42(4):216-228,13.基金项目
国家自然科学基金(41967005) （41967005）
广西自然科学基金(2020GXNSFBA159029) （2020GXNSFBA159029）
