首页|1978—2020年青藏高原草地净初级生产力时空演变分析

1978—2020年青藏高原草地净初级生产力时空演变分析

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探究全球气候变化背景下青藏高原草地净初级生产力的时空演变特征对青藏高原草地生态环境保护具有重要意义。本文以青藏高原为研究区域，基于DAYCENT模型模拟1978—2020年青藏高原草地净初级生产力(net primary productivity，NPP)，探究其草地NPP时空变化特征，并利用Pearson相关系数和偏相关系数分析气候、地形因子对初级生产力的影响。结果表明:1978—2020年青藏高原NPP整体呈现上升趋势，NPP总量波动范围为4。51×105～5。77×105Gg C·a-1，年平均值为499。83g C·m-2。在空间分布上，青藏高原NPP整体呈现从东南向西北递减的趋势。高寒草甸作为青藏高原草地的主要植被类型，其NPP空间分布与青藏高原草地基本保持一致;高寒草原的空间分布则呈现出从东北向西南递减的趋势。在气候因素影响方面，气温是造成草地NPP增加的主要因子;在地形因素影响方面，海拔是影响NPP的主要因子。在地形组合因子对NPP的影响中，青藏高原NPP高值区主要集中在低海拔向阳面的缓坡地区，低值区主要位于高海拔背阴面的斜坡地区。在不同区域以及不同气候条件下，青藏高原草地NPP数值差异明显，低海拔向阳面更有利于草地NPP的增长。
Spatial-temporal evolution of net primary productivity of grasslands on the Qinghai-Xizang Plateau from 1978 to 2020
To investigate the spatial-temporal dynamic characteristic of grassland net primary productivity (NPP) on the Qinghai-Xizang Plateau under global climate change,and provide a scientific basis for ecological environment protection of Qinghai-Xizang Plateau grassland. Taking the Qinghai-Xizang Plateau as the study ar-ea,based on the DAYCENT model to simulate the NPP of the Qinghai-Xizang Plateau grassland from 1978 to 2020,the temporal and spatial variation characteristics of the grassland NPP on the Qinghai-Xizang Plateau from 1978 to 2020 were studied. The climate and topography were analyzed using Pearson correlation coefficient and partial correlation coefficient effects of factors on grassland NPP. The findings are as follows:(1) From 1978 to 2020,the NPP of the Qinghai-Xizang Plateau showed an overall upward trend,the total NPP fluctuated from 4.51×105 to 5.77×105 Gg C·a-1,and the annual average was 499.83 g C·m-2. In space,there is a decreasing trend from southeast to northwest. (2) The alpine meadow is the main vegetation type of the Qinghai-Xizang Plateau grassland,and its NPP is consistent with the Qinghai-Xizang Plateau grassland in terms of spatial distri-bution,and the spatial distribution of the alpine meadow shows a decreasing trend from northeast to southwest. (3) Among the effects of climatic factors on grassland NPP,temperature is the main factor causing the increase of grassland NPP. Among the effects of terrain factors on grassland NPP,altitude is the main factor affecting NPP. In the influence of terrain combination factors on NPP,the high-value areas of NPP on the Qinghai-Xizang Plateau are mainly concentrated in the gentle slope areas on the sunny side at low altitudes,and the high-value areas are mainly located in the slope areas on the shady side at high altitudes. In different regions and un-der different climatic conditions,the NPP values of Qinghai-Xizang Plateau grasslands are significantly differ-ent,and the low-altitude sunny side is more conducive to the growth of grassland NPP.

Qinghai-Xizang Plateaunet primary productivityfuture climate scenariosDAYCENT model

徐士博、张美玲

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甘肃农业大学理学院数量生物研究中心,甘肃 兰州 730070

青藏高原 净初级生产力 未来气候 DAYCENT模型

国家自然科学基金项目甘肃省重点研发计划项目科技部高端外国专家引进计划甘肃农业大学横向项目甘肃省自然科学基金项目甘肃省自然科学基金项目

3226035321YF5WA096G2022042009LGSAU-JSFW-2022-201606RJZA0771308RJZA262

2024

10.7522/j.issn.1000-0240.2024.0082

冰川冻土
中国地理学会 中国科学院寒区旱区环境与工程研究所

冰川冻土

CSTPCD
影响因子：2.546
ISSN：1000-0240
年,卷(期)：2024.46(3)
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