摘要
为明晰青藏高原高寒区阔叶林植被碳储量现状及其动态变化特征,利用森林资源清查数据和标准样地实测数据,估算了青藏高原高寒区(青海和西藏两省区)阔叶林植被的碳储量、固碳速率和固碳潜力。结果表明:2011年青藏高原高寒区阔叶林植被碳储量为310.70 Tg,碳密度为89.04 Mg·hm^(–2)。六类阔叶林型(栎(Quercus)林、桦木(Betula)林、杨树(Populus)林、其他硬阔林、其他软阔林和阔叶混交林)中,阔叶混交林的碳储量最大,杨树林碳储量最小;其他硬阔林碳密度最大,其他软阔林碳密度最小。空间分配上碳储量和碳密度表现为:乔木层>灌木层>凋落物层>草本层>枯死木层。不同龄级碳储量和碳密度总体表现为随林龄增加逐渐增大的趋势。阔叶林碳储量从2001年的304.26 Tg增加到2011年的310.70 Tg,平均年固碳量为0.64Tg·a^(–1),固碳速率为0.19 Mg·hm^(–2)·a–1。不同林型固碳速率表现为其他软阔林最大,其他硬阔林最小;不同龄级表现为成熟林最大,幼龄林最小。阔叶林乔木层固碳潜力为19.09 Mg·hm^(–2),且不同林型固碳潜力表现为栎林最大,桦树林最小。三次调查期间阔叶林碳储量逐渐增加,主要原因是近年来森林保护工程的开展使阔叶林生长健康良好。
Aims Our objective was to explore the vegetation carbon storages and their variations in the broad-leaved forests in the alpine region of the Qinghai-Xizang Plateau that includes Qinghai Province and Xizang Autonomous Region.Methods Based on forest resource inventory data and field sampling, this paper studied the carbon storage, its sequestration rate, and the potentials in the broad-leaved forests in the alpine region of the Qinghai-Xizang Plateau. Important findings The vegetation carbon storage in the broad-leaved forest accounted for 310.70 Tg in 2011, with the highest value in the broad-leaved mixed forest and the lowest in Populus forest among the six broad-leaved forests that include Quercus, Betula, Populus, other hard broad-leaved species, other soft broad-leaved species, and the broadleaved mixed forest. The carbon density of the broad-leaved forest was 89.04 Mg·hm^-2, with the highest value in other hard broad-leaved species forest and the lowest in other soft broad-leaved species forest. The carbon storage and carbon density in different layers of the forests followed a sequence of overstory layer 〉understory layer〉 litter layer〉 grass layer 〉dead wood layer, which all increased with forest age. In addition, the carbon storage of broad-leaved forest increased from 304.26 Tg in 2001 to 310.70 Tg in 2011. The mean annual carbon sequestration and its rate were 0.64 Tg·a^-1 and 0.19 Mg·hm^-2·a^–1, respectively. The maximum and minimum of the carbon sequestration rate were respectively found in other soft broad-leaved species forest and other hard broad-leaved species forest, with the highest value in the mature forest and the lowest in the young forest. Moreover, the carbon sequestration potential in the tree layer of broad-leavedforest reached 19.09 Mg·hm^-2 in 2011, with the highest value found in Quercus forest and the lowest in Betula forest. The carbon storage increased gradually during three inventory periods, indicating that the broad-leaved forest was well protected to maintain a h
出处
《植物生态学报》
CAS
CSCD
北大核心
2016年第4期374-384,共11页
Chinese Journal of Plant Ecology
基金
中国科学院战略性先导科技专项(XDA05050207)
中国科学院重点部署项目-创新团队国际合作伙伴计划(KZZD-EW-TZ-06)
关键词
碳储量
固碳速率
固碳潜力
阔叶林
青藏高原高寒区
carbon storage
carbon sequestration rate
carbon sequestration potential
broad-leaved forest
alpine area of Qinghai-Xizang Plateau
