摘要
选取珠江三角洲森林、稻田和城市草地和菜地为研究对象,运用静态箱法,测量土壤COS、DMS、CS2和DMDS通量,并分析了环境因子对含硫气体交换速率的影响。结果表明,稻田和菜地交换速率最大,城市草地次之,森林土壤交换速率最小。森林土壤吸收COS,释放DMS,有凋落物土壤气体交换速率高于无凋落物土壤,CS2和DMDS源与汇存在很大不确定性。森林COS通量受温度、土壤含水量、土壤肥力、土壤微生物和土壤呼吸的共同影响;有水稻稻田吸收COS,无水稻稻田释放COS,有水稻稻田DMS释放速率显著高于无水稻稻田。干旱稻田土壤吸收COS,水淹土壤释放COS,但DMS、CS2和DMDS释放速率两者间无显著影响;城市草地吸收COS释放DMS,CS2和DMDS存在不确定性,有草土壤COS和DMS交换速率高于无草土壤,割草前后气体释放速率无显著变化;菜地释放VOSCs,其中DMDS占75%。
Typical ecosystems, including forest, rice paddy field, urban lawn and vegetable field, in the Pearl River Delta were selected to measure carbonyl sulfide （COS）, dimethyl sulfide （DMS）, carbon disulfide （CS2） and dimethyl disulfide （DMDS） exchange fluxes between soil and atmosphere using the static enclosure chamber technique, and the influence of environmental factors on the fluxes were also investigated. The results showed that： （1） the higher exchange rates were observed in rice paddy and vegetable fields, with the lowest values in forest ecosystems; （2） forest soils acted as COS sinks and DMS sources, with higher exchange rates at plots with litter than those without litter. There existed no consistent direction of fluxes for CS2 and DMDS. VOSCs fluxes in forests were influenced by a combination of temperature, soil water content, soil fertility, soil microorganisms and soil respiration; （3） rice-planted paddy field acted as sink and non rice-planted field as source for COS. DMS emission rates were significantly higher in rice-planted fields than those in non rice-planted fields. Dry field acted as sink and waterlogged field as source for COS, but no significant differences were found between dry and water-logged soils for DMS, CSa and DMDS fluxes; （3） urban lawn acted as COS sink and DMS source, with higher exchange rates at sites with grass than those without grass. There was no consistent flux direction for CS2 and DMDS. No significant variations of VOSCs fluxes were found for the lawn before and after mowing; （4） vegetable soils acted as sources for VOSCs and DMDS alone accounting for about 75% of VOSCs.
出处
《地球与环境》
CAS
CSCD
北大核心
2008年第4期298-303,共6页
Earth and Environment
基金
国家重点基础研究发展计划项目(2002CB410803)
福建农林大学青年教师科研基金项目(07A01)
关键词
挥发性有机硫化物
通量
土壤
珠江三角洲
volatile organic sulfur compound （VOSC）
flux
soil
Pearl River Delta
