新疆农田防护林不同林龄生物量及碳储量

探讨新疆农田防护林主要树种不同林龄组的生物量、碳储量、碳密度及其分布特征，为进一步开展新疆农田防护林生态系统碳循环、碳储量和潜力研究提供基础。根据新疆2014年森林资源二类调查数据，利用新疆农田防护林主要树种不同林龄下不同径阶的标准解析木样本数据，估算主要树种生物量、碳储量及碳密度变化规律和龄组特征，探讨主要防护林树种的固碳能力。结果表明，3种主要农田防护林树种的面积以幼龄林和中龄林为主，占总面积的66.68%，各树种中杨树占绝对优势，占总面积的79.62%。主要树种不同林龄组生物量，树干生物量占比最高。3种主要农田防护林树种碳储量杨树（6 119.53×10⁴ Mg）＞榆树（237.63×10⁴ Mg）＞沙枣（212.31×10⁴ Mg）。3种主要树种各龄组的碳密度为幼龄林（35.42 Mg·hm^-2）＜中龄林（172.69 Mg·hm^-2）＜近熟林（250.18 Mg·hm^-2）＜成熟林（442.36 Mg·hm^-2）。新疆农田防护林具有较高的生长潜力和固碳潜力。研究结果可为新疆农田防护林经营管理和碳汇功能评价提供参考。

Carbon Storage and Biomass of Farmland Shelterbelt Forests with Different Ages in Xinjiang

In order to understand the biomass,carbon storage,and carbon density and distribution of the farmland shelterbelt forests with different ages in Xinjiang to provide scientific basis for the further study of carbon circulation of the shelterbelt ecosystem,carbon storage and potential,the data of the national forest inventory of Xinjiang (2014) were adopted.Standard analytical wood sample data of different diameter steps were used to estimate the change regulation and characteristics of the biomass,carbon storage and carbon density.The carbon sequestration capacity of main shelterbelt species was discussed.It was fount that the area of the three main tree species used in farmland shelterbelt was dominated by young forest and half-mature forest，accounting for 66.68% of the total area.The sum of poplar area accounted for 79.62% of the total area.Trunk biomass accounted for the highest proportion in the biomass of the main tree species at different age groups.The carbon storages of main shelterbelt species were poplar（6 119.53×10⁴ Mg）＞elm（237.63×10⁴ Mg）＞Elaeagnus angustifolia（212.31×10⁴ Mg）.The carbon density at different age groups were young forest（35.42 Mg·hm^-2）＜ half-mature forest（172.69 Mg·hm^-2）＜near-mature forest（250.18 Mg·hm^-2）＜mature forest（442.36 Mg·hm^-2）.The shelterbelt forests in Xinjiang exhibited high potential in growth and carbon fixation.The results could be used as a reference for the management and evaluation of carbon sink of farmland shelterbelt in Xinjiang.