Spatial Variation of the Density of SOC of Picea Schrenkiana Forest and Relationships with Forest Development
There is a distinguish spatial variation in composition and structure of forest soil,which is one of the main factors leading to the uncertainty of estimation of soil organic carbon pools in forest.Additional forest stages may also be one of the important factors affecting the forest soil organic carbon pool estimation uncertainty.Soil samples were collected from a series of plots which set by forest ages of Picea schrenkiana forest on north slope of west,middle and east areas of Tianshan Montains.We tried to discuss the spatial variation of the density of SOC of Picea schrenkiana forest and attempted to analyze the reason why the spatial variation was presented from the perspective of forest development.The results showed that:(1) The average total soil organic density of standard profile at the depth 0 to 60 cm in Tianshan forest was 30.77 ± 13.46 kg/m2,and the distribution of the total SOC density of three areas of Tianshan Montains was middle area ＞ west area ＞ east area.In addition,there was a significant difference between east area and west areas (p ＜ 0.05);(2) The SOC density at a depth of 0-60 cm standard soil profile mainly presented a decreasing trend with increasing of profile depth.It had obvious surface assembly that the SOC density of surface soil (0-20 cm) accounted for 64.87％ of the total profile SOC,and maintained significant difference between surface's and SOC of two soil layers (20-40 cm,40-60 cm).(3) With a increase of the age plantation,density of SOC presented a bimodal curve as the forest age increased,whose peaks appeared at middle-aged forest and at over-mature forest,the order of SOC density of different age plantation was:over mature(37.02 ± 17.19 kg/m2) ＞ medium(33.58 ± 14.53 kg/m2) ＞ near mature(29.12 ± 15.77 kg/m2) ＞ mature (27.02 ± 7.62 kg/m2) ＞ juvenile (27.10 ± 9.81 kg/m2),no significant difference among all age plantation SOC.It indicated that SOC reserve of the north of Tianshan Mountains remained stable as a whole.By multi-factor analysis of variance,it showed that the spatial differentiation of SOC density mainly was affected by the location and soil conditions,while the influence of forest age on SOC density was not significant.This research can provide a data reference for the estimation of Tianshan forest SOC reserves,at the same time,provide important theoretical basis for more in-depth understanding of Tianshan forest SOC distribution and influencing factors.
NETL
NSTL
万方数据
维普
