NWIPB OpenIR
The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau
Chai, Xi; Shi, Peili; Song, Minghua; Zong, Ning; He, Yongtao; Li, Yingnian; Zhang, Xianzhou; Liu, Yanjiao
2020
发表期刊JOURNAL OF PLANT ECOLOGY
卷号13期号:2
摘要Aims Variations in vegetation spring phenology are widely attributed to temperature in temperate and cold regions. However, temperature effect on phenology remains elusive in cold and arid/semiarid ecosystems because soil water condition also plays an important role in mediating phenology. Methods We used growing degree day (GDD) model and growing season index (GSI) model, coupling minimum temperature (T-min) with soil moisture (SM) to explore the influence of heat requirement and hydroclimatic interaction on the start of carbon uptake period (SCUP) and net ecosystem productivity (NEP) in two alpine meadows with different precipitation regimes on the Qinghai-Tibet Plateau (QTP). One is the water-limited alpine steppe-meadow, and the other is the temperature-limited alpine shrub-meadow. Important Findings We observed two clear patterns linking GDD and GSI to SCUP: SCUP was similarly sensitive to variations in preseason GDD and GSI in the humid alpine shrub-meadow, while SCUP was more sensitive to the variability in preseason GSI than GDD in the semiarid alpine steppe-meadow. The divergent patterns indicated a balance of the limiting climatic factors between temperature and water availability. In the humid meadow, higher temperature sensitivity of SCUP could maximize thermal benefit without drought stress, as evidenced by the stronger linear correlation coefficient (IV) and Akaike's information criterion (AIC) between observed SCUPs and those of simulated by GDD model. However, greater water sensitivity of SCUP could maximize the benefit of water in semiarid steppe-meadow, which is indicated by the stronger R' and AIC between observed SCUPs and those of simulated by GSI model. Additionally, although SCUPs were determined by GDD in the alpine shrub-meadow ecosystem, NFP was both controlled by accumulative GSI in two alpine meadows. Our study highlights the impacts of hydroclimatic interaction on spring carbon flux phenology and vegetation productivity in the humid and semiarid alpine ecosystems. The results also suggest that water, together with temperature should be included in the models of phenology and carbon budget for alpine ecosystems in semiarid regions. These findings have important implications for improving vegetation phenology models, thus advancing our understanding of the interplay between vegetation phenology, productivity and climate change in future.
关键词growing degree day growing season index the start of carbon uptake period net ecosystem production alpine meadows Qinghai-Tibet Plateau
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/60367
专题中国科学院西北高原生物研究所
推荐引用方式
GB/T 7714
Chai, Xi,Shi, Peili,Song, Minghua,et al. The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau[J]. JOURNAL OF PLANT ECOLOGY,2020,13(2).
APA Chai, Xi.,Shi, Peili.,Song, Minghua.,Zong, Ning.,He, Yongtao.,...&Liu, Yanjiao.(2020).The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau.JOURNAL OF PLANT ECOLOGY,13(2).
MLA Chai, Xi,et al."The relative controls of temperature and soil moisture on the start of carbon flux phenology and net ecosystem production in two alpine meadows on the Qinghai-Tibetan Plateau".JOURNAL OF PLANT ECOLOGY 13.2(2020).
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Chai, Xi]的文章
[Shi, Peili]的文章
[Song, Minghua]的文章
百度学术
百度学术中相似的文章
[Chai, Xi]的文章
[Shi, Peili]的文章
[Song, Minghua]的文章
必应学术
必应学术中相似的文章
[Chai, Xi]的文章
[Shi, Peili]的文章
[Song, Minghua]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。