长江源草地生物量空间分布及分配初步研究  

Spatial Distribution and Allocation of Grassland Biomass in the Headwaters of the Yangtze River

作　　者：张双印 赵保成 赵登忠[3] 周伟 任斐鹏[5] 付重庆 郑航 郑学东[1,2] 徐平 ZHANG Shuang-yin;ZHAO Bao-cheng;ZHAO Deng-zhong;ZHOU Wei;REN Fei-peng;FU Chong-qing;ZHENG Hang;ZHENG Xue-dong;XU Ping(Spatial Information Technology Application Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Wuhan Center for Intelligent Drainage Engineering Technology Research,Wuhan 430010,China;International Cooperation Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;School of Geographical Sciences,Southwest University,Chongqing 400715,China;Soil and Water Conservation Department,Changjiang River Scientific Research Institute,Wuhan 430010,China;Field Scientific Observation Center,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]长江科学院空间信息技术应用研究所,武汉430010 [2]武汉市智慧流域工程技术研究中心,武汉430010 [3]长江科学院科技交流与国际合作处,武汉430010 [4]西南大学地理科学学院,重庆400715 [5]长江科学院水土保持研究所,武汉430010 [6]长江科学院野外科学观测中心,武汉430010

出　　处：《长江科学院院报》2024年第11期196-202,共7页Journal of Changjiang River Scientific Research Institute

基　　金：水利部重大科技项目(SKS-2022039);中央级公益性科研院所基本科研业务费项目(CKSF2023311,CKSF2023296/KJ)。

摘　　要：草地生态系统是人类应对气候变化的重要资源,三江源区的草地生态系统脆弱而敏感,是研究草地生态系统状况的重要区域。利用长江南源当曲水系源头、干流、支流区域3种不同覆盖度5次重复采样共45个样方的草地生物量,初步分析了长江南源的草地生物量的空间分布和地上地下分配比差异。结果表明,越靠近源头(海拔升高),草地地上地下生物量越低,长江南源当曲草地地上生物量分布在21.12~850.61 g/m^(2)之间,草地地下生物量在50.34~6810.68 g/m^(2)之间,且草地覆盖度越高,生物量随高度增加而递减的趋势越明显。草地地上地下生物量的比值都<0.5,且草地覆盖度越高,草地地上地下生物量的比值越低。研究对长江南源当曲的草地生物量分布及其分配进行了初步分析,为了解三江源草地状态提供了前期探索和数据积累。The grassland ecosystem is an important resource for humans to cope with climate change.The Headwaters of the Three Rivers is an important area to study the status of grassland ecosystem due to its vulnerability and sensitivity.Based on the totally 45 measured grassland biomass with varied coverage in the headwaters,mainstreams and tributaries,this study analyzed the spatial distribution of biomass and the ratio in the southern source of the Yangtze River.The results indicated that the grassland biomass becomes lower when the location is closer to headwater(as elevation increases).The grassland above-ground biomass(AGB)ranged from^(2)1.12 g/m^(2)to 850.61 g/m^(2),while belowground biomass(BGB)ranged from 50.34 g/m^(2)to 6810.68 g/m^(2).The higher the grassland coverage,the more obviously the biomass decreased with increasing elevation.The ratio of grassland AGB to BGB was less than 0.5,and the higher the grassland coverage,the lower the ratio.The study explored the distribution of AGB and BGB and their ratios,which provided preliminary exploration and data accumulation for understanding the grassland status in the source region of the three rivers.

关 键 词：长江源 当曲水系 地上生物量 地下生物量 生物量分配 三江源草地状态 

分 类 号：S812[农业科学—草业科学] K903[农业科学—畜牧学]