福建农林大学学报（自然科学版）2018，Vol.47Issue(3)：281-290,10.DOI:10.13323/j.cnki.j.fafu(nat.sci.).2018.03.004
不同坡度坡位下滇中烤烟地土壤呼吸的变化特征
Characteristics of soil respiration in flue-cured tobacco fields under different slope gradients in Central Yunnan
摘要
Abstract
Taking the ecological system of typical flue-cured tobacco field in Yuxi city of Yunnan as the research object,the flue-cured tobacco was treated by using the dynamic closed air chamber infrared CO2analyzer(LI-6400-09)for the treatment of flat ground,15°up-per slope position,15°middle slope position,15°lower slope position,30°upper slope position,30°middle slope position and 30°lower slope position.Soil respiration rate and its influencing factors in the growing season were measured and analyzed.The results were as fol-lows:(1)the soil respiration of flue-cured tobacco had a significant time change,which showed a trend of change in Shuangfeng type.The increase of gradient significantly reduced the average soil respiration rate(reduce 6.4 μmol·m-2·s-1),and slowed down the soil respi-ration rate of the extension root of flue-cured tobacco after transplanting.(2)Soil moisture at different slope positions was significantly dif-ferent.The increase of slope position significantly reduced the average soil respiration rate(reduce 2.6~3.5 μmol·m-2·s-1);(3) Soil temperature was the key factor causing soil respiration.The temperature sensitivity coefficient Q10of soil respiration was 1.01-1.39 and in-creased with the increase of slope.The increase of slope would also lead to a high correlation between soil temperature and soil respiration from the middle and the lower to the upper slope.(4) In the study area,soil humidity had greater effect on soil respiration than soil tem-perature,and the sensitivity of downslope soil respiration to humidity was greater than that of middle slope and uphill slope.In summary, changes in slope types can significantly change soil temperature and water conditions,and then affect soil respiration in flue-cured tobacco fields.关键词
烤烟地/土壤呼吸/土壤温度/土壤湿度Key words
flue-cured tobacco/soil respiration/soil temperature/soil moisture分类
农业科技引用本文复制引用
张伯浩,宋娅丽,王克勤,李学峰,聂慧莹..不同坡度坡位下滇中烤烟地土壤呼吸的变化特征[J].福建农林大学学报（自然科学版）,2018,47(3):281-290,10.基金项目
国家自然科学基金(30660037) （30660037）
云南省高校优势特色重点学科(生态学)建设项目(050005113111). （生态学）
