草业科学2017，Vol.34Issue(1)：51-58,8.DOI:10.11829/j.issn.1001-0629.2016-0415
海口城市草坪绿地土壤CO2通量时间变化及其环境解释——以海南师范大学南校区为例
Analysis on the temporal variation of soil CO2 flux and its response to the environmental factors in Haikou urban lawn-A case study of the south campus of Hainan Normal University
摘要
Abstract
To explore the change characteristics of soil CO2 flux and its response to air temperatures,soil temperatures,soil moistures and other environmental factors,the soil respiration rates of tropical urban lawn ecosystems were measured by using the LI-8100A Soil CO2 Flux System,and meanwhile air temperatures,soil temperatures at 5 cm and soil moisture 0-10 cm in depth were monitored from November of 2013 to October of 2014.The results showed that: 1) Daily variation of soil respiration was single peak curve.The peaks usually occurred at 09:00-16:00,and the time when peak values generally appeared were different in different months and weather conditions.Yearly variation of soil respiration was also a single peak curve.The mean daily soil respiration rate was 0.86 to 4.27 μmol·(m2·s)-1,with the maximum in June,and the minimum in December.2) There was a significant positive correlation between soil respiration rate and air temperature and soil temperature.However,the relationship between the CO2 flux and soil volumetric water content was more complex,and the correlation was not significant.3) Rainfalls had complicated effects on soil respiration.A light rain didn't significantly change soil respiration,but a heavy rainfall could have an obvious extrusion effect on soil CO2 flux.At the early stage of a heavy rainfall process,soil respiration rate increased with the increase of rainfall,however,continuous rainfall could increase the soil moisture,and rainfall became an important factor limiting soil respiration.关键词
土壤呼吸速率/温度/土壤水分/大气降水/城市草地Key words
soil respiration rate/temperature/soil moisture/rainfall/urban lawn分类
农业科技引用本文复制引用
徐文娴,卓志清,赵从举,朱敏捷,韩奇,吴小卫..海口城市草坪绿地土壤CO2通量时间变化及其环境解释——以海南师范大学南校区为例[J].草业科学,2017,34(1):51-58,8.基金项目
国家自然科学基金项目(41361006) （41361006）
