Analysis of GHG emission dynamics in hydroponics

以番茄根际温室气体（CO_2、N_2O和CH_4）排放为模型，研究了番茄根际CO_2、N_2O和CH_4排放的变化。主要研究结果如下：1.温室气体排放量高度依赖于环境条件，如温度、辐照和施肥。2.尽管土壤栽培的温室气体排放总量基本上大于岩棉栽培，但岩棉栽培与传统土壤栽培温室气体排放量的变化趋势基本一致。3.微生物区系和数量的变化与N_2O排放量的变化不相关。特别是建立了N_2O排放的连续实时测量系统，新发现了N_2O排放对施肥的一种非常快速的响应（即N_2O排放对施肥量的快速响应）。N2 O排放量在每次营养盐供应开始后10 ~ 15 min内开始增加，30 ~ 60 min达到峰值，最多在供应结束后7 h内恢复到背景水平。

A rockwool based nutrient dripping culture system for tomato was used as a model to clarifychanges in GHG emissions (CO_2, N_2O, and CH_4) from the rhizosphere. The points of the results are as follows: 1. The GHG emissions were highly dependent on the environmental conditions,such as temperature, irradiation, and fertilization. 2. The changes in GHG emission duringthe culture were almost the same between the rockwool culture and a traditional soilculture, although the total GHG emission was basically larger in the soil culture thanin the rockwool culture. 3. Changes in micro floras and the amounts were not correlatedwith the changes in N_2O emission. In particular, we established a continuous and real-timemeasurement system for N_2O emission, and newly discovered a very quick response of theN_2O emission to the fertilization (i.e., The N2O emission began to increase at least within10 to 15 min and peaked around 30 to 60 min from the beginning of each nutrient supply,and backed to the background level at most within 7 h after the end of the supply).