干旱区生态环境知识资源中心(Arid): 土壤水分胁迫对拉瑞尔小枝水分参数的影响

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	土壤水分胁迫对拉瑞尔小枝水分参数的影响
其他题名	Water parameters of the branch of Larrea tridentata under different soil drought stress
	张香凝 1; 孙向阳 2; 王保平 3; 乔杰 3; 崔令军 3; 孟伟 3; 杨超伟 3; 郝明丽 4
来源期刊	生态学报
ISSN	1000-0933
出版年	2014
卷号	34 期号:8 页码:1984-1993
中文摘要	采用压力室法在土壤水势为-0.021、-0.121、-0.698、-0.968MPa4种情况下对大田种植的1年生Larreatridentata的小枝水势进行测定,并绘制PV曲线,通过PV曲线求解各水分参数,用以判定土壤水分胁迫对L.tridentata生理特性的影响。研究结果表明:供水良好的情况下,L.tridentata水势日变化呈双峰曲线,随着土壤水分含量的减少,峰值逐渐变得不明显。在土壤水分胁迫条件下,L.tridentata有一定的渗透调节和保持膨压的能力,它一方面通过细胞壁弹性和拥有较高的束缚水含量来保持膨压,另一方面原生质具有较强的忍耐脱水的能力。随着土壤干旱胁迫的逐渐加重,其耐脱水能力提高,保持膨压的能力逐渐减弱。通过对其在不同土壤水分胁迫条件下渗透调节和维持膨压能力的综合评价,得出其在4种土壤水分状况下的综合抗旱指数分别为0.25、0.17、0.933、0.657,说明随着土壤水分含量的逐渐减少,L.tridentata能逐渐提高自身抵御干旱的能力以适应干旱;通过抗旱模型的判定得出L.tridentata属于高水势延迟脱水型耐旱树种。
英文摘要	Larrea tridentata is a xerophytic evergreen shrub,dominant in arid regions of the southwestern United States. The success of this desert shrub (creosote bush) has been largely attributed to its capacity for maintaining turgor pressure and stomatal control of photosynthesis under drought stress. However,the drought-resistance characteristics of plants are very complex. In addition to hereditary factors,environmental conditions may have strong impacts on the physiological performance of desert shrub seedlings,which may result in different performance of its drought-resistance capability. To study the drought resistance capability of L. tridentata,which was introduced to China from the United States,water parameters of the branches were determined in this study. The water potential of 1-year-old small branches of creosote bush was measured using the pressure chamber method. Four soil water potential levels were considered,namely,- 0. 021, -0. 121,-0. 698 and - 0. 968 MPa. Pressure-volume curves (PV curves) were generated over a wide range of water potentials to determine drought-resistance characteristics of the species. We obtained Psi_pi~(100) (the largest osmotic potential under the saturation moisture content),Psi_pi~0(osmotic potential when the turgor pressure value is zero),epsilon_(max) (elasticity module in the largest volume),V_s(free water content),V_a(bonded water content),RWC~0 (relative water content when turgor is zero),ROWC~0(relative content of the penetrated water when turgor is zero),and Psi_p (turgor pressure) from the PV curves. The results show that the diurnal transformation curve of water potential had two peaks when soil water content was sufficient,and the character diminished with decreasing soil water content. The relationship model between soil water potential and Psi_p is y = 1. 0541x~(0. 5033). It is concluded that the branches of L. tridentata can hold high water potential and its dehydration tolerance is strong,similar to that of conifers. Under drought conditions,L. tridentata took on an ability of osmotic adjustment and maintained Psi_p,mainly by improving cell-wall elasticity and retaining a higher proportion of water bound. Its capacity of sarcode dehydration tolerance is strong. With increasing drought stress,the capacity of the L. tridentata to maintain turgor pressure declined,whereas its capacity to tolerate dehydration increased. Moreover,we used a membership function to operationalize data from the PV curve into quantitative indices,obtaining fuzzy values of 0. 25, 0. 17,0. 933 and 0. 657 under four soil water potential conditions. Overall,the drought-resistance ability of L. tridentata was maintained and strengthened as soil moisture decreased. The drought model suggests that L. tridentata belongs to high water potential and dehydration-delaying species. Its drought-enduring mechanism operates mainly by restricting moisture loss and adopting available moisture to maintain higher water potential,combined with enduring dehydration with low water potential. That is,the protoplasm and main organs of the L. tridentata are unharmed or only slightly harmed under serious drought conditions,because of its cell-wall elasticity. These conclusions coincide with results obtained in the United States, and confirm that L. tridentata has maintained good drought resistance capacity after cultivation in China.
中文关键词	PV 技术 ; 水势 ; 渗透调节 ; 保持膨压 ; 水分胁迫
英文关键词	Larrea tridentata drought resistance Larrea tridentata osmotic adjustment PV technique turgor maintaining ability water potential
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5133670
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231573
作者单位	1.河南省农业科学院,植物营养与资源环境研究所, 教育部水土保持与荒漠化防治重点实验室, 郑州, 河南 450002, 中国; 2.北京林业大学水土保持学院, 教育部水土保持与荒漠化防治重点实验室, 北京 100083, 中国; 3.国家林业局泡桐研究开发中心, 郑州, 河南 450003, 中国; 4.开封县农业局, 开封, 河南 450000, 中国
推荐引用方式 GB/T 7714	张香凝,孙向阳,王保平,等. 土壤水分胁迫对拉瑞尔小枝水分参数的影响[J]. 北京林业大学,2014,34(8):1984-1993.
APA	张香凝.,孙向阳.,王保平.,乔杰.,崔令军.,...&郝明丽.(2014).土壤水分胁迫对拉瑞尔小枝水分参数的影响.生态学报,34(8),1984-1993.
MLA	张香凝,et al."土壤水分胁迫对拉瑞尔小枝水分参数的影响".生态学报 34.8(2014):1984-1993.