Comparison of foliar water use efficiency among 17 provenances of Larix gmelinii in the Mao’ershan area

doi:10.17521/cjpe.2015.0034

Abstract

Abstract: Aims

Investigating tree water use efficiency (WUE) is important for understanding the coupling of carbon and water cycles in terrestrial ecosystems and its responses and adaptation to climatic change. Dahurian larch (Larix gmelinii), the dominant tree species in the Chinese boreal forest, plays an important role in the regional carbon budget. In this study, we measured the foliar WUE and associated physiological parameters of 30-year-old Dahurian larch trees from 17 provenances with divergent climatic conditions in a common garden. Our specific aims were to compare differences in WUE among the provenances and explore whether the observed differences are attributed to potential adaptation or acclimation to local habitats.

Methods

We have measured net photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (G_s), and leaf nitrogen concentration (N_L) of three replicate trees per provenance from mid June to mid September of 2010. WUE was calculated as the ratio of P_n to T_r. Specific leaf area (SLA) was calculated as one-side projected leaf area divided by the leaf dry mass. The aridity index (AI) of each provenance was calculated as the ratio of mean annual evaporation to mean annual precipitation.

Important findings

WUE, P_n, G_s, T_r, SLA and N_L all differed significantly among the provenances. WUE showed a significant exponential relationship with G_s. WUE increased significantly with the increase of G_s when the G_s was less than 0.2, and was relatively stable when the G_s was greater than 0.2. WUE was significantly and positively correlated with N_L, but negatively with SLA. The degree of these correlations increased with increasing AI values of the tree origins. WUE was negatively correlated with the mean annual temperature and mean annual precipitation of the tree origins, but positively correlated with the AI of the tree origins. T_r and P_n were positively correlated with both mean annual temperature and AI of the tree origins, these results suggest that the trees may adapt to the local climatic conditions of their origins, which results in the significant difference in the needle morphological and physiological properties, and thus WUE among the provenances of Dahurian larch trees.

Key words: Larix gmelinii, water use efficiency, photosynthetic physiology, aridity index, climatic change

QUAN Xian-Kui,WANG Chuan-Kuan. Comparison of foliar water use efficiency among 17 provenances of Larix gmelinii in the Mao’ershan area[J]. Chin J Plan Ecolo, 2015, 39(4): 352-361.

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https://www.plant-ecology.com/EN/Y2015/V39/I4/352

Figures/Tables 4

References 60

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种源 Provenance	代码 Code	纬度Latitude (N)	经度Longitude (E)	年平均气温 MAT (℃)	平均年降水量 MAP (mm)	平均年蒸发量 MAE (mm)	干燥度 AI	≥10 ℃积温CT (℃)	相对湿度 RH (%)
友好 Youhao	1	47.80°	128.83°	-1.05	622.0	955.8	1.54	2 147.2	78
乌伊岭 Wuyiling	2	48.67°	129.42°	-1.19	584.6	1 038.0	1.78	1 851.2	73
新林 Xinlin	3	51.70°	124.33°	-3.35	507.3	912.0	1.80	1 535.3	69
桦皮窑 Huapiyao	4	50.70°	126.72°	-1.50	539.0	1 100.0	2.04	1 900.0	68
三站 Sanzhan	5	49.62°	126.80°	-1.30	527.2	1 076.0	2.04	1 650.0	70
十八站 Shibazhan	6	52.42°	125.27°	-2.03	480.0	999.1	2.08	1 680.0	70
沾河 Zhanhe	7	48.45°	126.50°	0.12	501.7	1 057.0	2.11	2 442.3	70
塔河 Tahe	8	52.32°	124.72°	-2.74	487.9	1 028.0	2.11	1 671.4	68
莫尔道嘎 Moerdaoga	9	51.25°	120.58°	-4.50	471.0	999.4	2.12	1 485.0	70
甘河 Ganhe	10	50.58°	123.22°	-2.50	470.0	1 059.0	2.25	1 616.8	68
根河 Genhe	11	50.68°	121.95°	-5.00	436.3	991.4	2.27	1 297.6	70
鹤北 Hebei	12	47.55°	130.42°	1.85	530.0	1 235.0	2.33	2 456.0	74
满归 Mangui	13	52.05°	122.18°	-5.83	466.0	1 100.0	2.36	1 550.0	72
绰尔 Chuoer	14	48.17°	121.25°	-3.40	462.3	1 122.0	2.43	1 238.4	70
库都尔 Kuerdu	15	49.78°	121.88°	-4.00	500.0	1 280.0	2.56	1 739.5	67
阿尔山 Aershan	16	47.17°	119.95°	-3.30	425.1	1 100.0	2.59	1 354.3	70
中央站 Zhongyangzhan	17	50.75°	125.20°	-2.20	484.4	1 387.0	2.86	1 780.0	69

种源 Provenance	代码 Code	纬度Latitude (N)	经度Longitude (E)	年平均气温 MAT (℃)	平均年降水量 MAP (mm)	平均年蒸发量 MAE (mm)	干燥度 AI	≥10 ℃积温CT (℃)	相对湿度 RH (%)
友好 Youhao	1	47.80°	128.83°	-1.05	622.0	955.8	1.54	2 147.2	78
乌伊岭 Wuyiling	2	48.67°	129.42°	-1.19	584.6	1 038.0	1.78	1 851.2	73
新林 Xinlin	3	51.70°	124.33°	-3.35	507.3	912.0	1.80	1 535.3	69
桦皮窑 Huapiyao	4	50.70°	126.72°	-1.50	539.0	1 100.0	2.04	1 900.0	68
三站 Sanzhan	5	49.62°	126.80°	-1.30	527.2	1 076.0	2.04	1 650.0	70
十八站 Shibazhan	6	52.42°	125.27°	-2.03	480.0	999.1	2.08	1 680.0	70
沾河 Zhanhe	7	48.45°	126.50°	0.12	501.7	1 057.0	2.11	2 442.3	70
塔河 Tahe	8	52.32°	124.72°	-2.74	487.9	1 028.0	2.11	1 671.4	68
莫尔道嘎 Moerdaoga	9	51.25°	120.58°	-4.50	471.0	999.4	2.12	1 485.0	70
甘河 Ganhe	10	50.58°	123.22°	-2.50	470.0	1 059.0	2.25	1 616.8	68
根河 Genhe	11	50.68°	121.95°	-5.00	436.3	991.4	2.27	1 297.6	70
鹤北 Hebei	12	47.55°	130.42°	1.85	530.0	1 235.0	2.33	2 456.0	74
满归 Mangui	13	52.05°	122.18°	-5.83	466.0	1 100.0	2.36	1 550.0	72
绰尔 Chuoer	14	48.17°	121.25°	-3.40	462.3	1 122.0	2.43	1 238.4	70
库都尔 Kuerdu	15	49.78°	121.88°	-4.00	500.0	1 280.0	2.56	1 739.5	67
阿尔山 Aershan	16	47.17°	119.95°	-3.30	425.1	1 100.0	2.59	1 354.3	70
中央站 Zhongyangzhan	17	50.75°	125.20°	-2.20	484.4	1 387.0	2.86	1 780.0	69