阿拉善白刺生长季叶片尺度耗水特性
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摘要
为了了解白刺生长季耗水特性,为优化水资源的配置和恢复与重建生态系统,以便在干旱、半干旱地区改进抗旱节水造林技术。本文对阿拉善地区白刺群落生长季叶片尺度耗水特性进行测定分析。结果表明:1)白刺生长季水分利用效率日变化最高值出现在上午,最小值出现在早、晚,5、6、9、10月份变化趋势在10∶00左右达到最大值,而7、8月份水分利用效率在8∶00左右达到最大值。白刺生长季水分利用效率9、10月份的水分利用效率最大,其次为7、8月份,最小为5、6月份;其中各月水分利用效率的均值10月>9月>7月>8月>6月>5月。2)整体上光合作用速率上午比较强,而蒸腾速率上午是呈现上升的趋势,植物蒸腾速率在中午达到最大值。下午二者都呈现递减的趋势,即光合作用减弱,蒸腾减弱。3)白刺生长季节各月叶片水势与蒸腾速率关系,呈现明显的相反趋势。4)白刺蒸腾耗水主要是消耗深度50cm土壤附近的水。
In order to understand the water consumption characteristics of Nitrariatangutorum in order to optimize the allocation of water resources and to restore and reconstruct the ecosystem,we can improve the droughtresistant and water-saving afforestation technology in arid and semi arid areas.In this paper,the characteristics of water consumption at the leaf scale of Nitrariatangutorum community in Alashan area were analyzed.The results showed that:1)The diurnal variation of water use efficiency in the growth season was the highest in the morning and the lowest in the early,late,5,6,9 and 10 months,August water use efficiency in the 8∶00 or so to reach the maximum.The water use efficiency of Nitrariatangutorum was the highest in July and August,followed by July and August,and the minimum was 5,6 months.The monthly water use efficiency was the highest in October> September>July> August>June> May.2)The overall photosynthetic rate was relatively strong in the morning,while the transpiration rate was increasing in the morning,and the plant transpiration rate reached the maximum at noon.Both in the afternoon showed a decreasing trend,that is,photosynthesis weakened,transpiration weakened.3)The relationship between leaf water potential and transpiration rate during the growing season was significant.4)white thorn transpiration water consumption is mainly the depth of 50 cm soil near the water.
In order to understand the water consumption characteristics of Nitrariatangutorum in order to optimize the allocation of water resources and to restore and reconstruct the ecosystem,we can improve the droughtresistant and water-saving afforestation technology in arid and semi arid areas.In this paper,the characteristics of water consumption at the leaf scale of Nitrariatangutorum community in Alashan area were analyzed.The results showed that:1)The diurnal variation of water use efficiency in the growth season was the highest in the morning and the lowest in the early,late,5,6,9 and 10 months,August water use efficiency in the 8∶00 or so to reach the maximum.The water use efficiency of Nitrariatangutorum was the highest in July and August,followed by July and August,and the minimum was 5,6 months.The monthly water use efficiency was the highest in October> September>July> August>June> May.2)The overall photosynthetic rate was relatively strong in the morning,while the transpiration rate was increasing in the morning,and the plant transpiration rate reached the maximum at noon.Both in the afternoon showed a decreasing trend,that is,photosynthesis weakened,transpiration weakened.3)The relationship between leaf water potential and transpiration rate during the growing season was significant.4)white thorn transpiration water consumption is mainly the depth of 50 cm soil near the water.
引文
[1]时永杰.白剌[J].中兽医医药杂志,2003,S1:715-722.
[2]赵克昌.白剌属灌木在黄土丘陵区荒山造林试验[J].干旱区资源与环境,1991,02:41-45.
[3]宁宝山,闫好原,高承兵,张世虎,张裕年,杨巨海.石羊河流域下游白刺平茬复壮试验研究[J].甘肃林业科技.2015(01)
[4]郭普,王镜泉,陈体恭,赵克昌.荒漠灌木白刺资源开发利用研究[J].甘肃农业大学学报.1993(02)
[5]李昌龙,李茂哉,汪杰,李爱德,赵克昌.绿洲边缘白刺林退化植被恢复与重建技术研究[J].干旱区资源与环境.2005(01)
[2]赵克昌.白剌属灌木在黄土丘陵区荒山造林试验[J].干旱区资源与环境,1991,02:41-45.
[3]宁宝山,闫好原,高承兵,张世虎,张裕年,杨巨海.石羊河流域下游白刺平茬复壮试验研究[J].甘肃林业科技.2015(01)
[4]郭普,王镜泉,陈体恭,赵克昌.荒漠灌木白刺资源开发利用研究[J].甘肃农业大学学报.1993(02)
[5]李昌龙,李茂哉,汪杰,李爱德,赵克昌.绿洲边缘白刺林退化植被恢复与重建技术研究[J].干旱区资源与环境.2005(01)