Effect of changing precipitation in different periods on precipitation use efficiency in a semi-arid grassland

IF 2.2 3区环境科学与生态学 Q2 ECOLOGY

Journal of Vegetation Science Pub Date : 2024-01-25 DOI:10.1111/jvs.13223

Hongjiao Wang, Yuying He, Daiyu Qiao, Rui Xiao, Zhongling Yang

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引用次数: 0

Abstract

Question

Climate change intensifies global and regional water cycles, leading to changes in both the magnitude and timing of precipitation. Precipitation use efficiency (PUE) plays a crucial role in measuring the response of above-ground net primary productivity (ANPP) to precipitation changes. However, little is known about how changes in precipitation during different periods affect PUE.

Methods

Using a manipulation precipitation experiment in a semi-arid steppe, we simulated a 60% increase and decrease in precipitation during the early (April–June), late (July–September), and entire (April–September) growing seasons across 2015–2021 to examine the effects of changes in precipitation timing on PUE.

Results

The results showed that: (1) decreased precipitation in the late growing season (DLP) and whole growing season (DWP) stimulated PUE by an average of 0.14 and 0.12 g m⁻² mm⁻¹ yr⁻¹ respectively, whereas increased precipitation in the late growing season (ILP) and whole growing season (IWP) suppressed PUE by an average of 0.11 and 0.09 g m⁻² mm⁻¹ yr⁻¹ respectively. By contrast, neither decreased nor increased precipitation in the early growing season affected PUE; (2) the increased PUE under DLP was primarily attributed to the increase of PUE in grass (GR) and annuals and biennials (AB), whereas the elevation of PUE under DWP was mainly due to an increase of PUE in AB. By contrast, the reduction of PUE under ILP was mainly caused by a decline of PUE in GR; (3) changes in evapotranspiration and leaf dry matter content (LDMC) explained the variation of PUE in AB while changes of PUE in GR was mainly due to the alteration of soil water content and LDMC.

Conclusions

These results suggest that precipitation during the late growing season has a crucial influence on PUE, highlighting the importance of evapotranspiration and LDMC in regulating ecosystem productivity in the semi-arid steppe.

Abstract Image

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不同时期降水量的变化对半干旱草原降水利用效率的影响

气候变化加剧了全球和区域水循环，导致降水量和降水时间发生变化。降水利用效率（PUE）在衡量地面净初级生产力（ANPP）对降水变化的响应方面起着至关重要的作用。然而，人们对不同时期降水量的变化如何影响降水利用效率知之甚少。

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来源期刊

Journal of Vegetation Science 环境科学-林学

CiteScore

6.00

自引率

3.60%

发文量

审稿时长

2 months

期刊介绍： The Journal of Vegetation Science publishes papers on all aspects of plant community ecology, with particular emphasis on papers that develop new concepts or methods, test theory, identify general patterns, or that are otherwise likely to interest a broad international readership. Papers may focus on any aspect of vegetation science, e.g. community structure (including community assembly and plant functional types), biodiversity (including species richness and composition), spatial patterns (including plant geography and landscape ecology), temporal changes (including demography, community dynamics and palaeoecology) and processes (including ecophysiology), provided the focus is on increasing our understanding of plant communities. The Journal publishes papers on the ecology of a single species only if it plays a key role in structuring plant communities. Papers that apply ecological concepts, theories and methods to the vegetation management, conservation and restoration, and papers on vegetation survey should be directed to our associate journal, Applied Vegetation Science journal.