1. 兰州大学 草地农业科技学院 草地农业生态系统国家重点实验室,甘肃,兰州,730020
2. 广西财经学院,广西,南宁,710100
纸质出版:2016
移动端阅览
张岩, 韦振锋, 黄毅. 1999-2012年三江源区植被净初级生产力及固碳释氧量测评[J]. 水土保持通报, 2016,36(1):100-105.
ZHANG Yan, WEI Zhenfeng, HUANG Yi. Evaluation of Vegetation Net Primary Productivity and Its Carbon Sequestration Value in Three-river Headwaters Region During 1999-2012[J]. Bulletin of Soiland Water Conservation, 2016, 36(1): 100-105.
张岩, 韦振锋, 黄毅. 1999-2012年三江源区植被净初级生产力及固碳释氧量测评[J]. 水土保持通报, 2016,36(1):100-105. DOI: 10.13961/j.cnki.stbctb.2016.01.018.
ZHANG Yan, WEI Zhenfeng, HUANG Yi. Evaluation of Vegetation Net Primary Productivity and Its Carbon Sequestration Value in Three-river Headwaters Region During 1999-2012[J]. Bulletin of Soiland Water Conservation, 2016, 36(1): 100-105. DOI: 10.13961/j.cnki.stbctb.2016.01.018.
[目的
]
估算近14 a三江源地区植被净初级生产力(net primary productivity
NPP)以及固碳释氧量
为河源区的生态环境建设以及制定碳减排与碳增汇政策提供科学依据. [方法
]
基于遥感、气象、土地等数据
通过CASA模型、碳排放模型、Sen+Mann-Kendall模型
分析三江源地区植被NPP及其固碳释氧量的时空变化特征. [结果
]
(1) 三江源区植被NPP单位面积多年均值主要集中在0~750 g/(m
2
·a)之间
约占研究区81.72%;空间分布特征呈东南—西北递减规律
高值分布在海拔较低、河流密集以及林地地区
而高寒地区NPP值相对较低.(2) 1999—2012年研究区NPP物质量年际变化呈增加趋势
增速约为7.26 g/(m
2
·a)
没有通过0.05显著水平检验;年际变化空间特征中
约23.64%呈下降趋势
其中通过0.05置信水平者约占2.3%
主要分布在人类活动较频繁的地区;在受人类活动影响较少且水资源丰富地区呈增加趋势
约占研究区的76.36%
其中30.58%通过0.05置信水平检验.(3) 固碳释氧物质量变化中
耕地变化幅度较大
其次是林地和其他用地
牧草地变化波动性较小.与人类活动因素有关
人为因素作用越明显
其变化幅度就越大
反之亦然. [结论
]
三江源高寒牧草地生态总体改善较好
受人类影响较少
而在海拔较低、河流密集以及人类活动频繁地区生态变化相对较复杂
局部地区存在退化现象
需要进一步加强该地区的生态环境保护建设.
[Objective] The objective of this study is to analyze the spatial and temporal changes of vegetation NPP(net primary productivity) and carbon fixation and oxygen release in the three-river headwater region during the past 14 years in order to provide scientific basis for the ecological sustainable development in this area. [Methods] NDVI
meteorological data
the land-use data and the remote sensing data were collected. The spatial and temporal variations in NPP and amounts of carbon fixation and oxygen release were analyzed based on CASA model
carbon emissions model and Sen+Mann-Kendall model. [Results] (1) The mean value of NPP was ranged from 0 to 750 g/(m2·a)
which accounted for 81.72% of the entire study area. The spatial distribution of average NPP presented a decreasing trend from southeast to northwest. And NPP in the lower altitude
rivers and dense woodland areas was higher than that in the alpine regions
which indicated that NPP was affected by altitude
rivers and land types. (2) The NPP showed an increasing trend in recent 14 years
with a growth rate of 7.26 g/(m2·a)(p>0.05). As to the inter-annual variation of NPP
about 23.64% of the study area showed a decreasing trend (2.3% of them p<0.05) while 76.36% showed an increasing trend (30.58% of them p<0.05). (3) As to the variation of carbon fixation and oxygen release
the cultivated land was larger than the forest land and other land use types. Variation of carbon fixation and oxygen release in forage land was small. [Conclusion] The alpine grassland ecosystem in the three-river headwater region was good
as it was less influenced by human beings. However
ecosystem in the low altitude
river and human activities intensive areas was complex and the locally degraded
and ecological environment in those regions need to be protected.
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