Responses of Water Use Efficiency in Larix gmelinii to Simulated Climate Warming

doi:10.7525/j.issn.1673-5102.2025.05.004

Abstract

Abstract:

Exploring the impact of climate warming on water use efficiency（WUE） of treesis significant for understanding the responses of tree carbon-water coupling to climate warming. In 2004， Larix gmelinii seedlings grown in four sites along temperate gradient（e.g.， Tahe， Songling， Sunwu and Dailing） simulating climate warming were transplanted to a common garden（Mao’ershan） near the natural edge of this species’ range. In August 2022， in the common garden and four different transplanting sites， the instantaneous water use efficiency（WUE_i） and intrinsic water use efficiency（WUE_g） were measured using the gas exchange method， and long-term water use efficiency（WUE_L） was calculated via carbon-13 isotope abundance to explore the effects of different simulating climate warming magnitudes on WUE of L. gmelinii. The results showed that both WUE_iand WUE_g significantly increased， with an increase of 33.37%， 38.84%， 42.06% and 58.76% for WUE_i， and an increase of 15.94%， 18.47%， 20.84% and 39.10% for WUE_gof L. gmelinii under the simulated climate warming by transplantation from the sites Tahe， Songling， Sunwu and Dailing， respectively. The WUE_L significantly increased by 16.92% and 30.56% for Songling and Tahe， respectively. The increasing rate of WUE_i， WUE_g and WUE_L showed positive linear correlations with the warming magnitude. Both WUE_i and WUE_gshowed significant and similar site differences in the common garden and among the transplanting sites， while WUE_L showed significant differences only among the transplanting sites. WUE_i was sensitive to all the warming magnitudes， but WUE_L was sensitive only to the high warming magnitude. Therefore， the warming magnitude and the determining methods should be taken into consideration in tree WUE responses to climate warming.

Key words: climate change, carbon-water coupling, water use efficiency, Larix gmelinii, photosynthetic capacity

CLC Number:

S718.51

Nan WANG, Jingjing WANG, Chuankuan WANG, Xiankui QUAN. Responses of Water Use Efficiency in Larix gmelinii to Simulated Climate Warming[J]. Bulletin of Botanical Research, 2025, 45(5): 686-694.

Figures/Tables 6

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地点 Site	纬度 Latitude （N）/（°）	经度 Longitude （E）/（°）	年平均气温 Mean annual temperature/℃	平均年降水量 Mean annual precipitation/mm	1月平均气温 Average temperature in January /℃	7月平均气温 Average temperature in July/℃	无霜期 Frost-free duration/d
帽儿山 Mao’ershan	45.40	127.50	3.10	629.00	-18.5	22.0	140.0
带岭 Dailing	47.08	128.90	1.34	621.27	-22.0	20.3	139.0
孙吴 Sunwu	49.22	127.20	0.62	554.08	-25.5	19.5	90.0
松岭 Songling	50.72	124.42	-0.54	525.36	-26.3	17.6	93.8
塔河 Tahe	52.52	124.65	-2.30	463.44	-25.5	16.7	89.7