干旱区枸杞蒸腾耗水变化特征及其影响因子响应分析

Abstract

Abstract: Obtained the real-time data of daily stem sap flow(SSF)and meteorological element series by the packaged stem sap flow monitoring system and automatic weather stations from April to November when is the growth periods of Lycium barbarum in arid area of Ningxia Province, China, this paper discussed the variation characteristics of transpiration water consumption and the correlation between SSF and meteorological elements, physiological growth index, which helped make out the water consumption rule of Lycium barbarum and supported its water requirement diagnosis. The results indicate that the SSF increases with the increase of stem diameter, having a positive linear relationship with each other. The maximum average rate of SSF is 41.95-136.13 mL·h^-1, and appears at the full blooming stage, followed by late flowering stage and fruit period. This indicates that these three stages are the key water requirement period of Lycium barbarum. The SSF has a peak period from June to August, during which SSF accounted for 20.25%, 19.23% and 18.64% of the total water consumption of the whole growth period, respectively. In addition, the minimum value of SSF appears at April and November. The SSF(S) has a linear relationship with the solar radiation(R_s) and daily air temperature(T_a), and has a two degree polynomial relation with the water vapor pressure difference(VPD), fitting the equation S=0.005R_s+0.066T_a+0.318VPD-0.533(R²=0.695). The relationship between SSF and stem diameter fits the equation S=1.137 7r-2.105 2(R²=0.821 067), and the relationship between SSF and crown width(A) fits the equation S=0.905 3A+0.541 6(R²=0.680 4). Moreover, the SSF has a significant positive correlation with photosynthetic active radiation(PAR), stomatal conductance(G_S) and transpiration rate(E_r), which passes 0.05 significance test.

Key words: arid area, Ningxia, Lycium barbarum, stem sap flow, transpiration water consumption, influence factors

CLC Number:

S161.4

XU Li-gang, DU Li, TANG Ying, TANG Rui, LI Jin-ze. Variation of transpiration water consumption and its response to the influence factors of Lycium barbarum in arid area[J]., 2016, 39(6): 1282-1290.

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Variation of transpiration water consumption and its response to the influence factors of Lycium barbarum in arid area

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