The Spatial Pattern Of Soil Respiration Response To Precipitation In Subtropical Evergreen Broad-leaved Forest

Forest soil respiration is one of the important links of terrestrial carboncycle,the change of forest soil respiration will directly affect the ability of forest carbon storage.Subtropical evergreen broad-leaved forest as frequent precipitation events and plentiful precipitation area,the great impact of the precipitation on the soil respiration in this region brought a lot of uncertain factors to the change of the global carbon balance,however,for a long time,the precipitation on soil respiration in the region has no comprehensive research on the effects of spatial pattern.This study chooses Lin-An district in Zhejiang,China,in a typical subtropical evergreen broad-leaved forest.Even in winter the area also has quite a frequent precipitation amount and plentiful precipitation.Choose this area Take a system and in-depth study of subtropical evergreen broad-leaved forest’s soil respiration.The results of the study are as follows:(1)Comparedwith the inverse distance weighting method,the spline function method,trend surface method,the BP neural network,the kringing method can more objectively describe the soil respiration spatial pattern.(2)The traditional descriptive statistical analysis and statistical analysis show that precipitation spatial interpolation interference will significantly change the original soil respiration spatial pattern.Due to the influence of precipitation on soil respiration in space variability,precipitation would change the spatial pattern of soil respiration.(3)The average soil respiration variation after precipitation interference has an obvious inverted-U relationship with the total amount of precipitation,and each sample point on variation of soil respiration after precipitation interference value(value = | soil respiration variation after the rain-soil respiration value before the rain |)and soil respiration before the precipitation values exist an obvious positive correlation.The result explains the influence of rainfall on soil respiration space mechanism.(4)After the precipitation significantly change the original soil respiration spatial pattern of the soil respiration,soil respiration spatial pattern will be in a stable state after about three days at the end of the rain.The results introduced the varying pattern in time on the soil respiration space after rainfall interference.(5)The stable soil respiration space after basic restored the relative status of the soil respiration before the precipitation,being the high value of soil respiration before precipitation.After the soil respiration spatial patterns stay in a stable state,the region is still a high value soil respiration area;the low value region of soil respiration before precipitation is still a low value area after the period that the precipitation interference is stable.The results show the difference between the soil respiration space pattern after the rain and the soil respiration space pattern before the rain.This study found the dynamic change rule of spatial pattern of soil respirationafter precipitation interference in this area,and explore the influence mechanism of precipitation on the soil Respiration Space Pattern of this area,to accurately quantify the region under the winter precipitation interference has a significant contribution to soil respiration,also provide a data foundation for the carbon cycle model based on precipitation interference conditions for this region.