Comparison of evapotranspiration components and water-use efficiency among different land use patterns of temperate steppe in the Northern China pastoral-farming ecotone
文献类型:SCI/SSCI论文
作者 | Li Y. Z.; Fan, J. W.; Hu, Z. M.; Shao, Q. Q.; Harris, W. |
发表日期 | 2016 |
关键词 | Temperate steppe Evapotranspiration composition Water-use efficiency Pastoral-farming ecotone Grassland use change Grassland cultivation Grazing exclusion rain-use efficiency precipitation-use efficiency gross primary production inner-mongolia grassland ecosystems semiarid steppe carbon storage climate-change dynamics forest |
英文摘要 | Water-use efficiency (WUE), which links carbon and water cycles, is an important indicator of assessing the interactions between ecosystems and regional climate. Using chamber methods with and without plant removal treatments, we investigated WUE and evapotranspiration (ET) components in three ecosystems with different land-use types in Northern China pastoral-farming ecotone. In comparison, ET of the ecosystems with grazing exclusion and cultivating was 6.7 and 13.4 % higher than that of the ecosystem with free grazing. The difference in ET was primarily due to the different magnitudes of soil water evaporation (E) rather than canopy transpiration (T). Canopy WUE (WUEc, i.e., the ratio of gross primary productivity to T) at the grazing excluded and cultivated sites was 17 and 36% higher than that at the grazing site. Ecosystem WUE (WUEnep, i.e., the ratio of net ecosystem productivity to ET) at the cultivated site was 34 and 28% lower in comparison with grazed and grazing excluded stepped, respectively. The varied leaf area index (LAI) of different land uses was correlated with microclimate and ecosystem vapor/carbon exchange. The LAI changing with land uses should be the primary regulation of grassland WUE. These findings facilitate the mechanistic understanding of carbon-water relationships at canopy and ecosystem levels and projection of the effects of land-use change on regional climate and productivity. |
出处 | International Journal of Biometeorology |
卷 | 60 |
期 | 6 |
页 | 827-841 |
语种 | 英语 |
ISSN号 | 0020-7128 |
DOI标识 | 10.1007/s00484-015-1076-9 |
源URL | [http://ir.igsnrr.ac.cn/handle/311030/43037] |
专题 | 地理科学与资源研究所_历年回溯文献 |
推荐引用方式 GB/T 7714 | Li Y. Z.,Fan, J. W.,Hu, Z. M.,et al. Comparison of evapotranspiration components and water-use efficiency among different land use patterns of temperate steppe in the Northern China pastoral-farming ecotone. 2016. |
入库方式: OAI收割
来源:地理科学与资源研究所
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