喀斯特不同坡位圆果化香的生理与形态特征比较
Comparison of Physiological and Morphological Traits of Platycarya longipes in Different Slope Locations in Karst Area
查看参考文献30篇
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文摘
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以喀斯特不同坡位的圆果化香为研究对象,测定上坡和中坡的土壤理化性质、圆果化香叶片的生理生化以及形态指标,研究不同坡位下圆果化香种群的水分调控、光合能力和形态特征的适应性差异。结果表明:(1)土壤含水量中坡比上坡高出94.73%,土壤有机质含量高出81.96%;土壤有效磷含量中坡高于上坡,全氮和全钾含量在两个坡位相差不大。(2)叶片净光合速率(Pn)日变化在上午9:00~11:00和下午13:00~16:00时中坡高于上坡,在"光合午休"时略低于上坡; Pn在中坡10时达到全天最高值7.53μmol·m~(-2)·s~(-1),而上坡在11时达到全天最大值7.03μmol·m~(-2)·s~(-1);叶片蒸腾速率(Tr)日变化在9:00~12:00中坡高于上坡,在12:00~15:00低于上坡。(3)圆果化香在中坡的叶片叶绿素a、b和总叶绿素含量分别比上坡高74.35%、80.89%、76.57%,丙二醛含量中坡小于上坡。(4)圆果化香叶片的平均长、宽、叶面积、叶片干重均为中坡大于上坡,而比叶面积上坡大于中坡;球果直径在中坡为2.65±0.16cm,比上坡大31.84%,球果的平均种子数量比上坡多27个。综合而言:由于坡位的差异,上坡土壤养分比中坡低得多,不能很好地供给植物生长;上坡圆果化香在水分输入方面不及中坡,而在水分输出方面高于中坡且调控不及时和不合理;在一天的光合作用中,中坡能积累更多的光合产物。 |
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其他语种文摘
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The objective of this paper is to study the effect of slope location on the differentiation of water regulation, photosynthetic capacity and morphology in Platycarya longipes grown in karst habitat. Soil characteristics, physiological and biochemical indexes, and morphological traits were investigated. Results showed that:(1)soil water content and soil organic matter of the middle slope were 94.73% and 81.96%, respectively, which were higher than those in the upper slope. The content of available phosphorus in the middle slope was higher than that in the upper slope. No significant difference was observed in the content of total nitrogen and total potassium between two slope locations.(2)Net photosynthetic rate(Pn)of Platycarya longipes in the middle slope was higher than that in the upper slope at the time period of 9:00 to 11:00 and 13:00 to 16:00.The Pn was down-regulated at the noon in both slopes. The highest Pn was found at 10 O'clock with 7.53μmol·m~(-2)·s~(-1) in the middle slope while 7.03μmol·m~(-2)·s~(-1) was measured at 11 O'clock in the upper slope. Transpiration rate(Tr)of Platycarya longipes in the middle slope was higher than that in the upper slope at the time period of 9:00 to 12:00 but lower than that in the upper slope between 12:00 and 15:00.(3)Contents of chlorophyll a (chl a)、chlorophyll b(chl b)and the total chlorophyll of Platycarya longipes in the middle slope were 74.35%、80.89% and 76.57%, respectively, which were higher than those in the upper slope. However, the content of malondialdehyde(MDA)in leaves of Platycarya longipes in the middle slope was lower than that in the upper slope.(4)Leaf length, width and area of Platycarya longipes in the middle slope were higher than that in the upper slope, respectively, but the specific leaf area(SLA)was lower than the latter. Further, the diameter of cone of Platycarya longipes in the middle slope was 2.65±0.16cm, which was 31.48% higher than that in the upper slope. There were 27more seeds in average in the middle slope than that in the upper slope. In conclusion, soil nutrition in the upper slope was much poorer than that in the middle slope, which meant that soil in the upper slope couldn't provide enough nutrition for the growth of plants. Moreover, water input and output were well regulated in the middle slope than that in the upper slope. According to the diurnal variation of photosynthesis between two slopes, the middle slope could accumulate much more photosynthetic products. |
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来源
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地球与环境
,2017,45(1):10-17 【核心库】
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DOI
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10.14050/j.cnki.1672-9250.2017.01.002
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关键词
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坡位
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圆果化香
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水分
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光合
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形态
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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植物学 |
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基金
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国家重点基础研究发展计划(973)项目专题
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文献收藏号
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CSCD:5922960
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30
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