Journal of Food, Agriculture and Environment
Vol 11,
Issue 3&4,2013
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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The water deprivation analysis and relationship with environmental factors of typical desert plants in Manas River Basin
Author(s):
Wenxin Yang 1, 2,
Xinlin He 1, 2*, Guang Yang 1, 2, Lianqing Xue 3, Jiangchun Chen 1, Shuangdui Xu 1, Si Chen 1Recieved Date: 2013-06-30, Accepted Date: 2013-09-28
Abstract:The stems fluid flow shows plant’s transpiration, and then reflects water deprivation of plants. Therefore, the vegetation moisture transfer process decides the regional ecological water demand and ecological security. Haloxylon ammodendron and Tamarix in Manas river basin as the research object, the study used Granier’s thermal diffuse method to measure vegetation trunk sap flow and analyze the relationship with environmental factors. The results show that: (1) The sap flow density of Haloxylon ammodendron and Tamarix showed significant circadian variation, its diurnal variation curve is multi-peak. Moreover the sap flow density exist “nap” phenomenon, and month average performance for July > August > September. (2) Haloxylon ammodendron sap flow density starting delayed 0.5 ~ 1 h after rain than sunny, and Tamarix delayed about 3 ~ 4 h. The sap flow density of Haloxylon ammodendron and Tamarix start time is closer in overcast and sunny day. The maximum sap flow density is for: after rain > sunny> overcast. (3) Haloxylon ammodendron and Tamarix’s changing trend is positive with temperature, total radiation and effective radiation, negative with relative humidity of air. Haloxylon ammodendron and Tamarix’s sap flow density effects by the combined environmental factors, impact order is effective radiation, the total radiation, air temperature, relative humidity. By stepwise regression analysis, we found effective radiation and air relative humidity is the two main meteorological factors to affect Haloxylon ammodendron sap flow and the regression model: Y1= -0.12 + 0.062 · X1 + 0.008 · X4. The effective radiation, temperature , relative humidity of air is the main meteorological factors to affect Tamarix tree trunk sap flow and the model: Y2 = -0.165 + 0.069 · X2 + 0.005 · X4 + 0.001 · X3.
Keywords:Haloxylon ammodendron,
Tamarix, sap flow density, environmental factors, Manas River BasinJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2792-2796
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