贝壳堤岛酸枣树干液流及光合参数对土壤水分的响应特征

doi:10.11707/j.1001-7488.20141004

Abstract

Abstract:

The characteristics of stem sap flow and photosynthe sis parameters in leaves of four-year-old Ziziphus jujuba var. spinosus, which was grown in shell ridge island, were studied under different soil water regimes with a packaged stem sap flow gauge based on stem-heat balance method and a CIRAS-2 portable photosynthesis system. The objective was to investigate the change pattern of stem sap flow and photosynthesis of leaves of Z. jujuba leaves in response to soil water conditions. The results showed that soil moisture had threshold effect on the stem sap flow and photosynthetic parameters of Z. jujuba. The stem sap flow velocity, diurnal cumulative sap flow flux and sap flow density all increased at first and then decreased with decreasing soil water content. The maximum daily sap flow flux (95.91 g·d^-1) was observed at the relative soil water content (W_r) of 61.6%, and the daily stem sap flow flux decreased by 35.7% and 94.8% at a W_r of 90.1% and 16.5% respectively. The daily water consumption declined under high soil water content and drought stress conditions, while drought stress had a more significant effect on the decrease of stem sap flow velocity and daily water consumption than high soil water content. The diurnal changes of stem sap flow velocity showed a wide single-peaked curve under all soil water condition. There were significant differences in stem sap flow between day and night were observed, and the stem slap flow maintained high levels during 9:00—15:00 and stopped during 19:00—5:30. With aggravation the aggravating of drought stress, stem sap flow started and reached the daily peak value later, and stopped earlier; The daily active time shorter from 12.5 h to 8.0 h, implying a shorten daily transpiration period, leading to a decrease of daily transpiration water consumption, which indicated a water physiological adaptability of Z. jujuba to drought stress. The net photosynthetic rate (P_n) and transpiration rate (Tr) in of Z. jujuba leaves increased first and then decreased with increasing W_r, while the water use efficiency (WUE) exhibited a trend opposite to that of P_nand Tr. Namely, under lower and higher water conditions, the photosynthetic production of leaves of Z. jujuba was low, but the water use efficiency was high. The maximum value of P_n (15.07 μmol·m^-2s^-1), Tr (8.56 mmol·m^-2s^-1), and WUE (4.40 μmol·mmol^-1) was observed at an W_r of 61.6%, 52.2% and 83.3%, respectively. The changes of stem sap flow and leaf photosynthetic parameters under variant soil water content indicated that Z. jujuba growing in shell sand habitat exhibited a certain tolerance to drought, but not to waterlogging.

Key words: Ziziphus jujuba var. spinosus, sap flow, water consumption, photosynthetic parameters, shell sand, soil water

CLC Number:

S718.43

Xia Jiangbao, Zhang Shuyong, Zhu Liping, Zhao Ziguo, Zhao Yanyun. Response Characteristics of Stem Sap Flow and Leaf Photosynthesis of Ziziphus jujuba var. spinosus in Response to Soil Moisture in Shell Ridge Island[J]. Scientia Silvae Sinicae, 2014, 50(10): 24-32.

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Response Characteristics of Stem Sap Flow and Leaf Photosynthesis of Ziziphus jujuba var. spinosus in Response to Soil Moisture in Shell Ridge Island

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