[Spatial differentiation and mechanism of carbon source/sink of forest swamps in riverside of Changbai Mountains, China].

To quantify the carbon source/sink function of riparian zone swamps and explore the feedback relationship with climate change, we measured the annual fluxes of soil greenhouse gas, soil carbon emission, net vegetation carbon sequestration and related environmental factors (temperature, water level, .) by static chamber-gas chromatography and relative growth equation methods in three kinds of forest swamps ( swamp, swamp, and swamp) distributed along the water reduction gradient of lowland to highland in the stream riparian zone of Changbai Mountains. The results showed that the annual fluxes of CH(0.

Variation of carbon source and sink along the environmental gradient from lakeside to highlands in Yuanchi swamp wetlands, Changbai Mountains, China.

Lacustrine wetlands have long-term carbon storage capacity and contribute significantly to regional carbon cycle, but it is unclear how its carbon sinks respond to climate change. We measured soil heterotrophic respiration carbon emissions (CO and CH), vegetation carbon sequestration, and related environmental factors (temperature, water level, .) of five kinds of natural swamps ( marsh-L, marsh-C, swamp-D, swamp-H, swamp-LT)by using static chamber gas chromatography and relative growth equation methods, along the water environmental gradients from lakeside to highlands in Yuanchi of Changbai Mountains.

Effects of light-felling intensity on hydrological effects of litter in Korean pine forests by 'planting conifer and preserving broadleaved tree' in Xiaoxing'an Mountains of China.

To understand the effects of 'planting conifer and preserving broadleaved tree' and light-felling on the hydrological effects of litter layer during the restoration of the climax vegetation broad-leaved Korean pine forest in temperate zone of Northeast China, we measured litter accumulation, water holding process of litter, and maximum holding water, maximum blocking and effective blocking amount of litter layers using sample survey method and indoor immersion method in three forests (aspen-Korean pine forests, white birch-Korean pine forest, and Mongolian oak-Korean pine forest) under different light-felling intensity (control, C; low light-felling, L; moderate light-felling, M; heavy light-felling, H) in Xiaoxing'an Mountains. The results showed that the intensity of light-felling had different effects on litter accumulation (7.32 to 15.

[Effects of harvest on greenhouse gas emissions from forested swamp during non-growing season in Xiaoxing'an Mountains of China.].

Soil greenhouse gas emission during non-growing season plays an important role in ecosystem carbon and nitrogen cycling in mid and high latitude regions. However, the effects of harvest on greenhouse gas emission during non-growing remain unclear. We measured the fluxes of CO, CH and NO and environmental factors (soil temperature, moisture, soil organic carbon and total nitrogen etc.

[Effects of light-felling on non-growing season greenhouse gas emission from soils in Korean pine forests in Maoer Mountains, China.].

Non-growing season soil greenhouse gas emission may play an important role in the forest ecosystem carbon and nitrogen cycle. However, it is not clear about the effects of the cutting distur-bance on soil greenhouse gas emissions during non-growing season. The CO, CH and NO fluxes and related environmental factors (soil temperature, water content, carbon and nitrogen, etc.

[Short-term effects of fire disturbance on greenhouse gases emission from Betula platyphylla-forested wetland in Xiaoxing'an Mountains, Northeast China].

By the methods of static chamber and gas chromatography, this paper studied the effects of fire disturbance on the seasonal dynamics and source/sink functions of CH4, CO2 and N2O emissions from Betula platyphylla-forested wetland as well as their relations with environmental factors in Xiaoxing' an Mountains of China. In growth season, slight fire disturbance on the wetland induced an increase of air temperature and ground surface temperature by 1.8-3.

[Effects of forest cutting on greenhouse gas emissions from Larix gmelini-Sphagnum swamps in Lesser Xing' an Mountains of Heilongjiang, China].

By using static chamber and gas chromatography methods, this paper studied the effects of clear cutting and selective cutting on the CO2, CH4, and N2O emissions from Larix gmelini-Sphagnum swamp in Lesser Xing' an Mountains. Dramatic changes in the seasonal dynamics of CH4 and N2O emissions were detected in different treatment sites. Control site absorbed CH4 in summer and emitted CH4 in autumn, and absorbed N2O in both summer and autumn; selective cutting site emitted CH4 and N2O mainly in summer; and clear cutting site emitted CH4 in summer and autumn, and absorbed N2O in summer but emitted it in autumn.

[Distribution patterns of woody plant diversity in stream riparian forests along an altitudinal gradient in Changbai Mountains].

By setting up sample transects and using alpha and beta diversity indices, this paper studied the woody plant diversity and its responses to cutting in the stream riparian primeval and secondary forests along an altitudinal gradient in Changbai Mountains. The results showed that all of the primeval forest communities distributed at different altitudes were composed of 11-13 tree species, but the importance of these tree species varied with altitude. Conifer species gradually took the place of broad-leaved tree species along the altitudinal gradient.