西藏东南部急尖长苞冷杉蒸腾耗水及其驱动因子分析

doi:10.12302/j.issn.1000-2006.202010049

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南京林业大学学报（自然科学版） ›› 2021, Vol. 45 ›› Issue (6): 151-158.doi: 10.12302/j.issn.1000-2006.202010049

西藏东南部急尖长苞冷杉蒸腾耗水及其驱动因子分析

李江荣(), 郭其强, 郑维列^*()

西藏农牧学院高原生态研究所,西藏高原森林生态教育部重点实验室,西藏林芝高山森林生态系统国家野外科学观测研究站,西藏林芝 860000

收稿日期:2020-10-30 接受日期:2021-04-23 出版日期:2021-11-30 发布日期:2021-12-02
通讯作者: 郑维列
基金资助:
国家自然科学基金项目(31660215);国家自然科学基金项目(41061033);西藏林芝森林生态系统定位研究项目(2020132061)

Analyses of transpiration water consumption of Abies georgei var. smithii and its driving factors in southeastern Tibet

LI Jiangrong(), GUO Qiqiang, ZHENG Weilie^*()

Institute of Tibet Plateau Ecology, Tibet Agricultural & Animal Husbandry University, Key Laboratory of Forest Ecology in Tibet Plateau(Tibet Agricultural & Animal Husbandry University), Ministry of Education, National Forest Ecosystem Observation & Research Station of Nyingchi Tibet,Nyingchi 860000,China

Received:2020-10-30 Accepted:2021-04-23 Online:2021-11-30 Published:2021-12-02
Contact: ZHENG Weilie

摘要/Abstract

摘要： 目的探讨不同径级急尖长苞冷杉个体蒸腾耗水规律,并分析其与主要气象因子的相关性,为明确西藏亚高山区林木生长规律提供重要参考。方法应用树干液流测定系统在西藏色季拉山天然急尖长苞冷杉林内对8株不同径级急尖长苞冷杉个体进行蒸腾耗水的连续测定,并同步监测5个气象因子。结果急尖长苞冷杉树干液流速率日变化为单峰曲线,7月、8月和9月8株样木平均液流速率分别为137.09、142.71和184.43 g/h,日活动时间为10:00—22:00,其峰值出现在16:00左右。急尖长苞冷杉树干蒸腾耗水速率与大气温度和光合有效辐射呈极显著正相关关系,与饱和水汽压差显著正相关,与大气湿度极显著负相关,与风速无关;蒸腾耗水与各因子相关系数绝对值排序为大气湿度>大气温度>光合有效辐射>饱和水汽压差。急尖长苞冷杉边材面积和日蒸腾耗水量均与胸径呈极显著的二次曲线关系,决定系数分别为0.999和0.937。结论急尖长苞冷杉蒸腾耗水日变化呈“N”形变化,受大气温湿度和光合有效辐射等环境因子影响显著;随胸径增加,单株日蒸腾耗水量迅速升高。

关键词: 急尖长苞冷杉, 蒸腾耗水, 驱动因子, 西藏东南部

Abstract:

【Objective】 The transpiration water consumption of Abies georgei var. smithii individuals with different diameters at breast height (DBH) was studied, and its correlations with meteorological factors were analyzed. This information could provide an important reference for understanding the forest growth rule in the sub-high mountain area of Tibet Autonomous Region. 【Method】 A stem sap flow measurement system was used to measure the transpiration water consumption of A. georgei var. smithii in the Sejila Mountains of southeastern Tibet. Eight individuals of A. georgei var. smithii with different DBH were measured, as well as five meteorological factors. 【Result】 The diurnal variation of the sap flow displayed a single peaked curve on sunny days, and the average stem sap flow rates of the eight samples were 137.09, 142.71 and 184.43 g/h in July, August and September, respectively. The activity period of sap flow was from 10:00 to 22:00, and its peak value occurred at approximately 16:00. The transpiration water consumption per unit sapwood area was significantly positively correlated with air temperature and photosynthetic active radiation, and was positively correlated with saturated vapor pressure difference (VPD), but was negatively correlated with air relative humidity, and had no relation with wind speed. The ranking of correlation coefficients was air relative humidity > air temperature > photosynthetic active radiation > VPD. The DBH was significantly correlated with sapwood area (R ²=0.999) and transpirtation water consumption per day (R²=0.937). 【Conclusion】 The diurnal variation in the transpiration water consumption of A. georgei var. smithii was of “N” type, which was significantly affected by environmental factors, such as air temperature, humidity, and photosynthetic active radiation. The daily transpiration water consumption per plant increased rapidly with the increase in DBH.

Key words: Abies georgei var. smithii, transpiration water consumption, driving factor, southeastern Tibet

中图分类号:

S718.5

李江荣,郭其强,郑维列. 西藏东南部急尖长苞冷杉蒸腾耗水及其驱动因子分析[J]. 南京林业大学学报（自然科学版）, 2021, 45(6): 151-158.

LI Jiangrong, GUO Qiqiang, ZHENG Weilie. Analyses of transpiration water consumption of Abies georgei var. smithii and its driving factors in southeastern Tibet[J].Journal of Nanjing Forestry University (Natural Science Edition), 2021, 45(6): 151-158.DOI: 10.12302/j.issn.1000-2006.202010049.

图/表 7

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编号 No.	树高/ m height	胸径 (去皮)/ cm DBH	边材厚/ cm sapwood depth	边材面积/ cm² sapwood area	冠幅直径/ m canopy diameter	探针长度/ cm probe length
1	5.2	7.01	1.02	19.17	3.4	30
2	6.1	8.28	1.10	24.80	3.2	30
3	6.2	8.92	1.16	28.25	3.8	30
4	21.4	29.46	2.35	200.03	4.5	50
5	22.8	30.25	2.34	205.11	4.3	50
6	25.5	42.04	2.75	339.25	4.6	50
7	30.4	45.06	2.81	372.82	5.4	80
8	41.8	84.71	4.58	1 152.41	6.8	80

编号 No.	T_a/ ℃	H_R %	E_VPD/ kPa	R_PAR/ (μmol· m^-2·s^-1)	风速/ (m·s^-1) wind speed
1	0.637^**	-0.805^**	0.240^*	0.636^**	0.038
2	0.704^**	-0.771^**	0.218^*	0.703^**	0.151
3	0.730^**	-0.843^**	0.228^*	0.678^**	0.134
4	0.674^**	-0.780^**	0.260^*	0.486^**	0.132
5	0.660^**	-0.710^**	0.211^*	0.406^**	-0.185
6	0.699^**	-0.767^**	0.257^*	0.470^**	0.179
7	0.616^**	-0.635^**	0.255^*	0.303^**	0.202
8	0.519^**	-0.743^**	0.212^*	0.453^**	-0.047

编号 No.	回归方程regression equation	R²	df
1	Y=-59.26+22.19 T_a+2.29 H_R-326.67 E_VPD +0.004 R_PAR	0.847	73
2	Y=-104.98+1.78 T_a+2.4 H_R-253.61 E_VPD +0.01 R_PAR	0.866	73
3	Y=-25.38+37.17 T_a+2.44 H_R-490 E_VPD +0.01 R_PAR	0.789	73
4	Y= 575.23+119.84 T_a+1.27 H_R-1 369.53 E_VPD +0.15 R_PAR	0.827	73
5	Y= 106.37+18.91 T_a+0.69 H_R-182.6 E_VPD +0.03 R_PAR	0.786	73
6	Y= 641.11+114.73 T_a+3.79 H_R-1 157.31 E_VPD +0.27 R_PAR	0.831	73
7	Y= 198.21+23.12 T_a+1.81 H_R-181.24 E_VPD +0.06 R_PAR	0.732	73
8	Y= 402.81+173.88 T_a+9.48 H_R-2 591.78 E_VPD +0.12 R_PAR	0.767	73

西藏东南部急尖长苞冷杉蒸腾耗水及其驱动因子分析

Analyses of transpiration water consumption of Abies georgei var. smithii and its driving factors in southeastern Tibet

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