目前已有的研究結(jié)果顯示出調(diào)控森林土壤主要溫室氣體（CO2,，CH4,， N2O）通量的因素很多，如外部環(huán)境因子（溫度,、降水,、氮沉降等），土壤特性（物理,、化學(xué),、生物等）等，但如何量化這些因素的調(diào)控作用并沒有得到很好的解決,，成為這些氣體通量模型發(fā)展的瓶頸,。

華南植物園生態(tài)及環(huán)境科學(xué)研究中心閆俊華研究員等利用森林土壤移位（從河南雞公山移到廣東鼎湖山）實驗,，通過比較相同土壤在不同外部環(huán)境因子條件下，或不同土壤在相同外部環(huán)境因子條件下主要溫室氣體通量的差異,，發(fā)現(xiàn)外部環(huán)境因子是森林土壤CO2和N2O氣體通量的決定因素,，而土壤是森林土壤CH4氣體通量的決定因素，并通過模型模擬和實際觀測值的比較對上述結(jié)果進(jìn)行了驗證,。研究給森林土壤主要溫室氣體模型建立所考慮的參數(shù)以重要啟示,，如土壤的物理、化學(xué)和生物的特征參數(shù)是建立森林土壤CH4氣體通量模型所考慮的重點,。(生物谷Bioon.com)

生物谷推薦的英文摘要

Global Change Biology   doi: 10.1111/gcb.12327

Responses of CO2, N2O and CH4 fluxes between atmosphere and forest soil to changes in multiple environmental conditions

JUNHUA YAN, WEI ZHANG, KEYA WANG, FEN QIN, WANTONG WANG,HUITANG DAI and PEIXUE LI

To investigate the effects of multiple environmental conditions on greenhouse gas (CO2, N2O, CH4) fluxes, we transferred three soil monoliths from Masson pine forest (PF) or coniferous and broadleaved mixed forest (MF) at Jigongshan to corresponding forest type at Dinghushan. Greenhouse gas fluxes at the in situ (Jigongshan), transported and ambient (Dinghushan) soil monoliths were measured using static chambers. When the transported soil monoliths experienced the external environmental factors (temperature, precipitation and nitrogen deposition) at Dinghushan, its annual soil CO2 emissions were 54% in PF and 60% in MF higher than those from the respective in situ treatment. Annual soil N2O emissions were 45% in PF and 44% in MF higher than those from the respective in situ treatment. There were no significant differences in annual soil CO2 or N2O emissions between the transported and ambient treatments. However, annual CH4 uptake by the transported soil monoliths in PF or MF was not significantly different from that at the respective in situ treatment, and was significantly lower than that at the respective ambient treatment. Therefore, external environmental factors were the major drivers of soil CO2 and N2O emissions, while soil was the dominant controller of soil CH4 uptake. We further tested the results by developing simple empirical models using the observed fluxes of CO2 and N2O from the in situ treatment and found that the empirical models can explain about 90% for CO2 and 40% for N2O of the observed variations at the transported treatment. Results from this study suggest that the different responses of soil CO2, N2O, CH4 fluxes to changes in multiple environmental conditions need to be considered in global change study.