干旱胁迫下六组冬瓜杨各生理指标变化分析,硕士论文.docx
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1、干旱胁迫下六组冬瓜杨各生理指标变化分析,硕士论文本试验在互助北山林场苗圃对 2008 年互助北山林区选取的 48 株无性系和2021 年在麦秀林区、双朋西林区、兰采林区、循化孟达自然保卫区、祁连县祁连林区、古城、甘肃连城林区选取的 14 株无性系以及互助北山林区 13 株无性系扦插苗 1 年生苗木成活率、生长量比照,挑选出 6 个优良无性系 H1、H10、HB10、HB18、HB19、M2 进行气孔以及生理指标测定。冬瓜杨叶片气孔密度与气孔长度存在负相关关系,且与水分利用率存在相关系。干旱胁迫条件下六组冬瓜杨各生理指标的变化有明显差异,对干旱胁迫的生理反响不同,讲明采用单项生理指标评价六组冬瓜
2、杨之间耐旱差异存在一定的片面性,因而仅利用单项生理指标不能准确反映六组冬瓜杨抗旱性差异。建立 H1、H10、HB10、HB18、HB19、M2的净光合速率和土壤含水量的数学模型,经计算 H1、H10、HB10、HB18、HB19、M2 土壤水合补偿点分别为 1.19%、5.02%、2.05%、2.19%、2.10%、1.34%,结合本研究,H1、H10、HB10、HB18、HB19、M2 适宜土壤含水量为 11.18%15.34%、21.61%29.66% 、 26.41%36.25% 、 22.34%30.65% 、 23.87%32.75% 、17.54%24.07%,并且基于六组冬瓜杨叶
3、片 Pn、Tr、PPO、CAT 活性的变化状况,利用从属函数法对六组冬瓜杨的抗旱性进行综合评价,H1、H10、HB10、HB18、HB19、M2 叶片的 4 个生理指标的平均从属函数值分别为 0.528、0.475、0.492、0.439、0.474、0.505,由此对六组冬瓜杨抗旱性强弱排序为 H1M2HB10H10HB19HB18。利用模糊从属函数法对正常情况下 H1、H10、HB10、HB18、HB19、M2 的生长性状进行评价,H1、H10、HB10、HB18、HB19、M2 的 11个指标的平均从属函数值分别为 0.025、0.018、0.026、0.078、0.029、0.030,
4、由此对 H1、H10、HB10、HB18、HB19、M2 生长性状排序为 HB18M2HB19HB10H1H10。本文关键词语:冬瓜杨,光合特性,保卫酶活性,干旱胁迫,从属函数法AbstractIn this experiment, the survival rate and growth of 1 year old seedlings of 48clone cuttings selected from Mutual Aid Beishan Forest Region in 2008, 14 clonecuttings selected from Maixiu Forest Region, S
5、huangpengxi Forest Region, LancaiForest Region, Mengda Nature Reserve of Xunhua, Qilian Forest Region of QilianCounty, Gucheng and Liancheng Forest Region of Gansu Province in 2021, and 13clone cuttings selected from Mutual Aid Beishan Forest Region in 2021 werecompared in the nursery of Mutual Aid
6、Beishan Forest Farm. And then six excellentclones H1, H10, HB10, HB18, HB19 and M2 were screened for stomatal andphysiological indexes determination. There was a negative correlation betweenstomatal density and stomatal length of Populus purdomii, and it was related to wateruse efficiency. There wer
7、e obvious differences in the physiological indexes of sixgroups of Populus purdomii under drought stress, and the physiological responses todrought stress were different, which indicated that there was a one-sidedness in theevaluation of drought tolerance among six groups of Populus purdomii by sing
8、lephysiological index. Therefore, only single physiological index can not accuratelyreflect the drought resistance of six groups of Populus purdomii. By using themathematical models of net photosynthetic rate and soil moisture content of H1, H10,HB10, HB18, HB19, M2, the soil hydration compensation
9、points of H1, H10, HB10,HB18, HB19 and M2 were calculated at 1.19%, 5.02%, 2.05%, 2.19%, 2.10% and1.34% respectively. And the appropriate soil water content of H1, H10, HB10, HB18,HB19 and M2 was 11.18%-15.34%, 21.61%-29.66%, 26.41%-36.25%,22.34%-30.65%, 23.87%-32.75%, 17.54%-24.07% respectively. Th
10、en, based on thechanges of Pn, Tr, PPO, CAT activities of the six-group Populus purdomii leaves, thedrought resistance of six groups of Populus purdomii were evaluated by membershipfunction method, and the average membership function values of four physiologyindicators of the leaves of H1, H10, HB10
11、, HB18, HB19, HB19 and M2 were 0.528,0.475, 0.492, 0.439, 0.474, 0.505, respectively. Thus , the order of drought resistanceof six groups was H1 M2 HB10 H10 HB19 HB18. In addition, the growth characteristics of H1, H10, HB10, HB18, HB19 and M2 under normal conditionswere evaluated by fuzzy membershi
12、p function method, and the average membershipfunction values of 11 indexes of H1, H10, HB10, HB18, HB19, M2 were 0.025, 0.018,0.026, 0.078, 0.029, 0.030, respectively. Therefore, the growth traits of H1, H10,HB10, HB18, HB19 and M2 were HB18 M2 HB19 HB10 H1 H10.Keywords:Populus purdomii photosynthet
13、ic characteristics protective enzymeactivity droughts tress subordinate function method.目 录内容摘要 .IIAbstract .III缩略词表 .V目录 .VI幅较长,部分内容省略,具体全文见文末附件第4章 干旱胁迫下 6 个冬瓜杨优良无性系生理生化的响应由于中国南北方水资源分布严重失衡,并且全球气候变暖问题,干旱问题已成为全球性的生态问题。到 21 世界末,由于全球气候变暖加重,导致地表水分快速蒸发,严重影响到植物的生长,植物生长特性除了遗传基因的控制,愈加遭到外部环境的影响,如温度、湿度、光照等。而水
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