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非生长季/生长季非均匀增温提高了高寒草甸的降水利用效率，但降低了其时间稳定性。

Non-growing/growing season non-uniform-warming increases precipitation use efficiency but reduces its temporal stability in an alpine meadow.

作者信息

Han Fusong, Yu Chengqun, Fu Gang

机构信息

Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.

出版信息

Front Plant Sci. 2023 Jan 27;14:1090204. doi: 10.3389/fpls.2023.1090204. eCollection 2023.

DOI:10.3389/fpls.2023.1090204
PMID:36778684
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9911657/
Abstract

There are still uncertainties on the impacts of season-non-uniform-warming on plant precipitation use efficiency (PUE) and its temporal stability (PUE) in alpine areas. Here, we examined the changes of PUE and PUE under two scenes of non-growing/growing season non-uniform-warming (i.e., GLNG: growing-season-warming lower than non-growing-season-warming; GHNG: growing-season-warming higher than non-growing-season-warming) based on a five-year non-uniform-warming of non-growing/growing season experiment. The GLNG treatment increased PUE by 38.70% and reduced PUE by 50.47%, but the GHNG treatment did not change PUE and PUE. This finding was mainly due to the fact that the GLNG treatment had stronger influences on aboveground biomass (AGB), non-growing-season soil moisture (SM), temporal stability of AGB (AGB), temporal stability of non-growing-season air temperature ( ), temporal stability of growing-season vapor pressure deficit (VPD) and temporal stability of start of growing-season (SGS). Therefore, the warming scene with a higher non-growing-season-warming can have greater influences on PUE and PUE than the warming scene with a higher growing-season-warming, and there were possibly trade-offs between plant PUE and PUE under season-non-uniform-warming scenes in the alpine meadow.

摘要

在高寒地区，季节非均匀变暖对植物降水利用效率（PUE）及其时间稳定性（PUE）的影响仍存在不确定性。在此，我们基于一项为期五年的非生长季/生长季非均匀变暖实验，研究了在非生长季/生长季非均匀变暖的两种情景（即GLNG：生长季变暖低于非生长季变暖；GHNG：生长季变暖高于非生长季变暖）下PUE和PUE的变化。GLNG处理使PUE提高了38.70%，使PUE降低了50.47%，但GHNG处理并未改变PUE和PUE。这一发现主要是由于GLNG处理对地上生物量（AGB）、非生长季土壤湿度（SM）、AGB的时间稳定性（AGB）、非生长季气温的时间稳定性（ ）、生长季水汽压亏缺的时间稳定性（VPD）以及生长季开始时间的时间稳定性（SGS）有更强的影响。因此，非生长季变暖较高的变暖情景对PUE和PUE的影响可能大于生长季变暖较高的变暖情景，并且在高寒草甸的季节非均匀变暖情景下，植物PUE和PUE之间可能存在权衡。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/08715ef89899/fpls-14-1090204-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/d99866041a50/fpls-14-1090204-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/b81f35c73776/fpls-14-1090204-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/5f07dde32a3e/fpls-14-1090204-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/08715ef89899/fpls-14-1090204-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/d99866041a50/fpls-14-1090204-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/b81f35c73776/fpls-14-1090204-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/5f07dde32a3e/fpls-14-1090204-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fa3a/9911657/08715ef89899/fpls-14-1090204-g004.jpg

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