水土保持通报2018，Vol.38Issue(1)：82-88,95,8.DOI:10.13961/j.cnki.stbctb.2018.01.014
黄土丘陵区不同土地利用类型土壤呼吸及其与温度和水分的关系
Soil Respiration of Different Land Uses and Its Relation to Water and Temperature in Hilly Area of Loess Plateau
摘要
Abstract
[Objective] The characteristics of soil respiration rates were studied in different land use types of the hilly region in the Loess Plateau in order to investigate the features of the carbon cycle of different land use types.[Methods] Soil carbon flux of five land use types such as Onobrychis viciifolia,Medicago sativa,abandoned land,M.sativa with terraces and Astragalus adsurgens in standard runoff plots were monitored by LI-8 100 system,the surface temperature,soil temperature at 5 cm and soil moisture were monitored.[Results] ① The diurnal variation of soil respiration rates showed peak curves with higher in the day time and lower in the night time,which showed the same trend with temperature.The annual soil respiration rates were as follows:A.adsurgens (terraced) [2.27 μ mol/(m2 · s)]＞O.viciaefolia [1.79 μ mol/(m2 · s)]＞M.sativa [1.77 μmol/(m2 · s)]＞M.sativa (terraced) [1.62 μmol/(m2 · s)]＞abandoned land [0.77 μmol/ (m2 · s)].② Soil respiration rates showed obvious seasonal variation,and the highest appeared in summer,followed by spring and summer,the lowest was in winter.There were significant differences of soil respiration rates between summer and other seasons(p＜0.05).③ The correlation between soil respiration rates,surface and soil temperature were significant in different land use types (p＜0.05).The correlation between soil respiration rate and soil temperature was higher than that of surface temperature in all the land use types except abandoned land,soil temperature values (5 cm) Q10 of each site varied from 1.94 to 3.00.④ No significant linear relationship was found between soil respiration rates and soil moisture (p＞0.05),whereas significant correlation was exhibited between soil respiration rate and the interactions of soil temperature with soil moisture (p＜0.01).[Conclusion] Soil respiration rates of terrace are better than slope land,and the soil quality was significantly improved by vegetation restoration.关键词
土壤呼吸/温度/土壤水分/土地利用类型/黄土丘陵区Key words
soil respiration/temperature/soil moisture/land use types/the hilly area of the Loess Plateau分类
农业科技引用本文复制引用
马涛,贾志清,周波,张峰,董彦丽,陈天林..黄土丘陵区不同土地利用类型土壤呼吸及其与温度和水分的关系[J].水土保持通报,2018,38(1):82-88,95,8.基金项目
甘肃省科技支撑计划基金“黄土丘陵沟壑区坡耕地、梯田土壤呼吸特征研究”(1204FKCA069) （1204FKCA069）
甘肃省水利科研计划项目“陇中坡改梯土壤呼吸特征及水土保持优化技术研究”(2014-223-6) （2014-223-6）
