准噶尔盆地梭梭群落生物量和碳储量

Biomass and carbon storage of Haloxylon ammodendron community in Junggar Basin

梭梭(Haloxylon ammodendron)是准噶尔盆地建群种和优势种,因此,研究其群落的生物量及碳汇功能有着重要意义。以研究区内10个固定样点为研究对象,样地内每木检尺,并结合梭梭群落各组分含碳率的实测值,对准噶尔盆地梭梭群落的生物量和碳储量进行了估算,通过实测数据及模型分析,结果表明:1梭梭的生物量随树龄增加逐渐增大,从0—5龄时1.9948 kg增加到了21—25龄时61.6480 kg,进入26龄以后,梭梭枝条出现部分枯死,其中粗枝生物量是地上生物量的主体(所占比例平均为63.53%)。2不同龄级梭梭的含碳率在49.08与53.57之间变动,加权平均值为51.60,同一龄级之间各组分之间的含碳率变化以0—5龄级最小,其变异系数为1.72%,以21—25龄级最大,变异系数为6.78%。3梭梭群落其它组分的平均含碳率分别为灌木43.84%,草本39.13%,枯落物31.47%;土壤含碳率平均值为0.0310%,随土层深度增加各层次土壤碳含量逐渐减少。4准噶尔盆地梭梭群落碳密度为5815.7183kg/hm2,总碳储量为1919万tC,采用实测含碳率作为转换系数比缺省值0.5所得出的结果高1.53%。这些结果说明,准噶尔盆地梭梭群落具备明显的碳汇功能,应加强管理,使该区域森林生态系统在北疆地区碳交易中发挥更大的作用。

Haloxylon ammodendron was the edificators and dominant species in Junggar Basin, it is important to research biomass and carbon pool of Haloxylon ammodendron community. The study was conducted on the basis of 10 permanent plots in study area,and each tree in the plots was measured. We estmiate biomass and carbon storage of Haloxylon ammodendron community with the measured value of carbon content. Through measurement data and model analysis,basic conclusions are as follows：（1）The biomass which increases with the increasing of tree-age grew from 1.9948 kg in tree-age 0-5 to 61.6480 kg in 21-25, and branches started partly dead after 26. and the partition ratio of thick branch biomass was main （mean 63.53）; （2）Carbon content moves between 49.08 and 53.57, the weighted average is 51.60. Between the various components of the same age class was different, least in 0-5 （coefficient of variation 1.72%） and largest in 21-25 （coefficient of variation 6.78%）; （3）The carbon content of shrub, herb and litter is 43.84%, 39.13%, 31.47%, respectively. The mean carbon content of soil which reduces gradually with the depth is 0.0310%.（4）The carbon storage of Haloxylon ammodendron community in the Junggar Basin was revealed,which was 1919×104t in total, with a density of 5815.7183kg/hm2, and 1.53% higher using actual carbon content than the default value（0.5）. Owing to the fact, Haloxylon ammodendron community has showed obvious carbon pool functions, by emphasising quality of intensive management, forest ecosystem of Junggar Basin will have greater influences on carbon sequestration of the Northern Xinjiang area.