Study On The Spatio-temporal Variation Of Soil Respiration And The Controlling Factors In The Wetland Ecosyetem Of Yellow River Delta

Soil respiration is the global carbon cycle, an important aspect of the carbon balance ofpayments research, soil carbon is relatively stable, but because of great content, even smallchanges may affect the atmospheric carbon pool and climate change. Soil carbon flux, namelythe dynamic changes in soil carbon pool, second only to terrestrial photosynthesis, carbonflux, is the world’s second continental carbon fluxes much larger than the artificial carbonemissions. Soil respiration to small changes in the global carbon balance of payments will bea significant impact and influence the future atmospheric CO₂changes. Human activities thecarbon emissions of about1.6².0Pg C disappear （called missing carbon sink, missingcarbon sink）, so look for it to become one of the global carbon cycle research scientific issues.If you use the appropriate terrestrial ecosystem carbon management policies and theimplementation of the corresponding increase in exchange technology, are likely to increasecarbon sink capacity of terrestrial ecosystems, anthropogenic emissions of CO₂furtherincrease will help ease the world’s soil carbon storage.From2010to2011, the Yellow River Delta, select the typical vegetation communities inPhragmites australis, Suaeda glauca, cotton, and set the bare ground control, and long termdetermination of the soil respiration rate in these plots, and soil respiration factor net radiation,net photosynthetic rate, soil temperature, soil moisture, biomass, simultaneous determination,and Temporal and spatial dynamics of soil respiration and net radiation, net photosyntheticrate, the relationship between soil temperature, soil moisture and vegetation condition study.The main findings are summarized as follows:（1） The Yellow River Delta wetland ecosystem soil respiration showed significantdiurnal variation. Phragmites australis, Suaeda glauca, cotton, bare land soils on dynamicchanges in respiration almost radiate the same dynamic trend asymmetric unimodal form, firstincreased and then decreased the net radiation and photosynthesis, soil respiration changes themain affecting factors.（2） The Yellow River Delta wetland ecosystem soil respiration showed a significantseasonal variation. Soil respiration rate peaks in the Phragmites australis, Suaeda glauca,cotton growing period, average daily soil respiration rate Phragmites australis, Suaeda glauca,cotton, soil respiration rate was significantly higher than the bare soil respiration rate with the Phragmites australis, Suaeda glauca growth time in January, February, March, August,September, soil respiration rate the Suaeda glauca higher than the Phragmites australis, theaverage monthly soil respiration rate in reed higher than Suaeda glauca view of its period, thePhragmites australis soil respiration rate has been higher than cotton.（3） The soil temperature is one of the main factors of the Yellow River Delta wetlandecosystem in the soil respiration rate in the seasonal dynamics of Phragmites australis,Suaeda glauca, cotton, bare land average daily soil respiration rate and5cm,10cm,20cmbetween the temperature of the soil temperature good exponential function of all sorts to theseasonal dynamics of soil respiration rate and temperature changes are not exactly the same,indicating that temperature is not the only influencing factor, soil moisture, vegetation andsoil temperature of the soil respiration synergy impact on soil respiration.（4）The temperature sensitivity of soil respiration in all sorts of places there are somedifferences. Reed wetland change the cotton farmland, cotton farmland Q₁₀values higher thanthe value of Phragmites communis Q₁₀and Q₁₀values higher than bare Phragmites communisand Suaeda salsa community, not similarly calculated soil respiration temperature sensitivityof different Q₁₀values to calculate The Q₁₀value of small changes in a large range of soiltemperature changes in the small magnitude of soil temperature.（5） Soil moisture on soil respiration of all sorts of places have a greater impact on thelinear function the better the relationship between the simulated soil respiration and soilvolumetric water capacity,20cm of soil water content compared with10cm of soil moisturecontent linear function can better express the relationship between soil respiration rate inseasonal dynamics of soil moisture content of the Yellow River Delta wetland ecosystem, theheavy rainfall in the Yellow River Delta in August, the soil moisture saturation, all kinds ofsoil respiration rates sharply lower.（6） Between the dynamic changes of soil respiration season and vegetation type,vegetation community growth statuses are closely related. Vegetation communities in theseason of vigorous growth, biomass growth, soil respiration rate rise was significant or highlysignificant exponential relationship between soil respiration and biomass, coupledtemperature and vegetation biomass can explain the soil respiration rate in the vast parts.（7） The spatial variability of soil respiration in the Yellow River Delta wetland ecosystemdue to the Phragmites australis, Suaeda glauca, cotton, vegetation condition and there are differences. Phragmites australis, Suaeda glauca, cotton, bare soil respiration rate from thetotal scope of analysis suitable for the average soil temperature, soil moisture conditions,aboveground and underground high biomass vegetation in soil respiration rate was higher.