疏勒河上游高寒草地斑块对生态系统碳交换及估算的影响研究

项目名称： 疏勒河上游高寒草地斑块对生态系统碳交换及估算的影响研究

项目编号： No.41501081

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 天文学、地球科学

项目作者： 秦彧

作者单位： 中国科学院寒区旱区环境与工程研究所

项目金额： 25万元

中文摘要： 不同斑块镶嵌共存的景观格局在青藏高原高寒草地普遍存在。在大尺度上通常采用卫星遥感反演系统碳储量和通量，但其精度不足以分辨青藏高原高寒草地上普遍存在的斑块，因而影响反演的精度。本项目拟在卫星遥感像元尺度采用实地观测对疏勒河上游高寒草地斑块对生态系统碳交换及估算的影响进行研究。通过观测不同斑块生态系统碳储量和通量以及生物和环境因子的特征，阐明高寒草地生态系统碳交换对斑块的响应机制；同时基于不同斑块生态系统碳储量和通量的观测结果，结合卫星遥感指数，分析斑块导致的估算结果的不确定性。本项目的开展可以为生态、水文模拟提供基础资料，减少遥感反演的不确定性；同时为高寒草地生态系统保护和退化草地生态恢复提供科学依据。

中文关键词： 斑块；高寒草地；碳储量；碳通量；遥感反演

英文摘要： The landscape pattern with different patches mosaic coexisting is common in the alpine grassland on the Qinghai-Tibetan Plateau (QTP). Satellite remote sensing is usually used to estimate ecosystem carbon pool and flux at large scale. However, it is difficult to distinguish patches commonly existed in the alpine grassland on the QTP, which would influence the accuracy of remote sensing retrieval. This project proposes to investigate the effects of patches on ecosystem carbon exchange and estimation of alpine grassland based on the field observation at pixel scale of satellite remote sensing in Shule river basin. Ecosystem carbon stock, ecosystem carbon flux, abiotic and biotic factors of different patches will be observed in field to illuminate the response of ecosystem carbon exchange to patches. The effect of patches on the estimation of ecosystem carbon stock and flux will be analyzed quantitatively in conjunction with field observation data of ecosystem carbon stock and flux and satellite remote sensing index. This project is conducive to reducing the uncertainty of remote sensing retrieval and supplying base data for ecological, hydrological models. Meanwhile, this research is also important for alpine grassland protecting and the restoration of degraded grassland.

英文关键词： Patches;Alpine grassland;Carbon stock;Carbon flux;Remote sensing retrieval