天山北坡山地生态系统植被碳利用效率时空动态及其影响因素

doi:10.13292/j.1000-4890.202410.031

生态学杂志 ›› 2024, Vol. 43 ›› Issue (10): 2923-2931.doi: 10.13292/j.1000-4890.202410.031

天山北坡山地生态系统植被碳利用效率时空动态及其影响因素

孙丰华^1,2,3，王玉刚^1,2,3*，孙金金^1,2,3，李双媛^1,2,3，陈炳铭^1,2,3

（¹中国科学院新疆生态与地理研究所，荒漠与绿洲生态国家重点实验室，乌鲁木齐 830011； ²中国科学院阜康荒漠生态系统国家站，新疆阜康 831505； ³中国科学院大学，北京 100049)

出版日期:2024-10-10 发布日期:2024-10-09

Spatial-temporal variation and influencing factors of vegetation carbon use efficiency in mountain ecosystem on the northern slope of Tianshan Mountains.

SUN Fenghua^1,2,3, WANG Yugang^1,2,3*, SUN Jinjin^1,2,3, LI Shuangyuan^1,2,3, CHEN Bingming^1,2,3

(¹State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; ²Fukang Station of Desert Ecology, Chinese Academy of Sciences, Fukang 831505, Xinjiang, China; ³University of Chinese Academy of Sciences, Beijing 100049, China).

Online:2024-10-10 Published:2024-10-09

摘要/Abstract

摘要： 植被碳利用效率（CUE）是衡量生态系统固碳能力重要指标，对评估区域植被碳汇能力具有重要意义。本研究以天山北坡山地生态系统阜康林区为对象，基于2000—2020年的遥感影像和DEM数据，结合路径分析，研究了近21年来植被CUE时空分布特征及影响因素。结果表明：阜康林区植被CUE为0.42～0.74，年均为0.6，其中亚高山草甸带最高，中山森林带最低，具有明显的垂直地带性分异特征，且随海拔呈先降低后增高的“抛物线”分布模式，与净初级生产力（NPP）、总初级生产力（GPP）呈现相反的趋势。年际变化上，区域植被CUE变化不大（P>0.05），增加的区域仅占总面积的8.72%，主要分布在中山森林带，表明长期的森林抚育管理促进了中山森林带的植被CUE增加。禁牧区与非禁牧区范围的植被CUE年际间变化不大（P>0.05），表明目前禁牧管理措施对林区植被CUE的影响较弱。在坡向上，CUE的分布具有明显的空间异质性，在低山草原带和中山森林带，阳坡的CUE最高，在亚高山草甸带半阳坡的CUE最高。降水量、气温和NDVI的增加会直接导致CUE减少，而蒸散发增加间接导致CUE的减少，且禁牧区内自然因素对CUE的影响作用小于非禁牧区。

关键词: 碳利用效率, 路径分析, 净初级生产力, 总初级生产力, 禁牧

Abstract: Vegetation carbon use efficiency (CUE) is an important indicator for ecosystem carbon sequestration capacity, and for assessing the regional vegetation carbon sink capacity. Based on remote sensing images and DEM data from 2000 to 2020, we analyzed the spatial and temporal variations and influencing factors of vegetation CUE in Fukang forest region on the north slope of Tianshan Mountains. The results showed that vegetation CUE in Fukang forest region ranged between 0.42 and 0.74, with an average annual value of 0.6. CUE value was the highest in the subalpine meadow zone and the lowest in the mid-mountain forest zone. There was obvious vertical zonal differentiation, with a “parabola” distribution pattern that decreased first and then increased with altitude. The patterns of both net primary productivity (NPP) and gross primary productivity (GPP) were opposite with CUE. The regional vegetation CUE showed limited interannual variation (P>0.05). The area with significantly increased CUE only accounted for 8.72% of the total area, which was mainly distributed in the mid-mountain forest zone, indicating that longterm forest management promoted the increase of vegetation CUE in the mid-mountain forest zone. There were no significant interannual changes in vegetation CUE values between non-grazing area and grazing area (P>0.05), indicating that grazing exclusion had a weak impact on vegetation CUE in forest areas. The distribution of CUE had spatial heterogeneity in slope aspect. CUE valve was the highest in sunny slopes both in the low-mountain grassland zone and mid-mountain forest zone, and in half-sunny slope in the subalpine meadow zone. The increase of precipitation, temperature, and NDVI directly reduced CUE, while the increase of evapotranspiration indirectly reduced CUE. Natural factors had less influence on CUE in the grazing exclusion area than that in the grazing area.

Key words: carbon use efficiency, path analysis, net primary productivity (NPP), gross primary productivity (GPP), grazing exclusion

孙丰华, 王玉刚, 孙金金, 李双媛, 陈炳铭. 天山北坡山地生态系统植被碳利用效率时空动态及其影响因素[J]. 生态学杂志, 2024, 43(10): 2923-2931.

SUN Fenghua, WANG Yugang, SUN Jinjin, LI Shuangyuan, CHEN Bingming. Spatial-temporal variation and influencing factors of vegetation carbon use efficiency in mountain ecosystem on the northern slope of Tianshan Mountains.[J]. Chinese Journal of Ecology, 2024, 43(10): 2923-2931.

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天山北坡山地生态系统植被碳利用效率时空动态及其影响因素

Spatial-temporal variation and influencing factors of vegetation carbon use efficiency in mountain ecosystem on the northern slope of Tianshan Mountains.

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