【作者】 李秀芬；

【导师】 朱金兆； 刘德玺；

【作者基本信息】 北京林业大学 ， 水土保持与荒漠化防治， 2012， 博士

【摘要】 在盐碱地利用和造林技术研究方面,世界多国包括中国都取得了重要成果,提出了许多行之有效的措施,但还远没有适应盐碱地绿化美化的需求。该项研究选择黄河三角洲盐碱地,采用随机区组、多因素正交试验等田间试验设计进行了盐碱地造林技术、造林树种适应性和耐盐生理指标的测定,在对测定数据采用Excel和SPSS软件进行统计分析的基础上,选择树木耐盐有关的多个指标进行了聚类分析和层次分析评价,研究取得如下结果：1.黄河三角洲土壤粘重,试验地为重壤土和轻粘土；通透性差,土壤总孔隙度为：38%-50%,非毛管孔隙最大值为：6%；含盐量高,为2 g.kg-1-6 g.kg-1；有机质和养分含量低,有机质只有4.68 g.kg-1,土壤碱解氮、速效磷和速效钾含量分别为：0.74mg.kg-1、13.14 mg.kg-1和168mg.kg-1。试验地表层土壤含盐量随时间的变化受到基部土壤含盐量的影响；土壤含盐量的水平分布与土壤含水量负相关；土壤含盐量的垂直分布形态也受到土壤水分变化的影响,当表层土壤含水量接近或不足5%时,土壤含盐量的垂直变化大。2.三种不同客土处理(基部加10cm河沙、加10cm稻糠、加5cm河沙+5cm稻糠)试验表明：绒毛白蜡三种客土造林成活率分别为对照的135%、134%和127%；刺槐是190%、176%和149%；侧柏都为对照的181%。绒毛白蜡和侧柏的株高、地径生长也显著高于对照。对绒毛白蜡而言,土壤含盐量越高,其客土造林效果越明显,在重度盐碱地造林成活率、高、径生长分别是对照的200.6%、224.3%、196.0%；客土不同处理之间以基部加入10cm稻糠效果最好。不同树种最佳的基盘配方不同,绒毛白蜡和侧柏以草炭含量30%和50%为好,而刺槐是70%。基盘配方对沙柳的成活和生长影响不大。3.造林地的含盐量对造林成果起着至关重要的作用,绒毛白蜡和侧柏在含盐量高的地块上成活率显著降低,在轻、中、重三种不同地块上,绒毛白蜡的成活率分别为94.1%、83.3%和22.2%,侧柏的成活率分别为88.9%、72.2%和11.1%；而刺槐除了与含盐量有关外,还与土壤质地关系密切。成活率分别为33.3%、16.7%和77.8%。不同树种的高、径生长都是在轻度和中度盐碱地生长良好,而重度盐碱地明显制约树木的生长。4.对树种耐盐性试验中采用的16个树种的生理指标SOD、POD和CAT活性,叶绿素、类胡萝卜素、可溶性糖、可溶性蛋白、脯氨酸和MDA含量,细胞膜透性进行了测定,发现不同树种间叶绿素与可溶性糖、SOD显著正相关,相关系数分别为0.662和0.657；SOD和CAT显著正相关,相关系数为0.412,POD与相对电导率显著负相关,相关系数为-0.431。5通过分析评价提出：构树、绒毛白蜡、紫穗槐、侧柏、沙柳、枸杞,对盐碱地具有较强的适应性,可以作为黄河三角洲盐碱地造林的首选树种；中等推荐树种有：木槿、合欢、君迁子、金银花、桑树和刺槐；本次研究不推荐树种：白榆、臭椿、毛桃和山杏。更多还原

【Abstract】 The research on land use and afforestation technology in saline soils has achieved a lot of important results both in China and abroad. Nowadays, a number of effective measures were put forward and applied in practice, but it was far from the needs in view of land greening and landscape constructing in saline-alkaline land reclamation. Under the situation, to meet the challenge of the big gap, the study was performed by taking the saline land in Yellow River Delta region as experimental site, and planting techniques such as tree species adaptability and physiological indicators of salt-tolerance were quantitatively determined with the design of field experiment, i.e. randomized block and multi-factor orthogonal. All the measured data were treated based on statistical analysis by Excel and SPSS program. Among them, multiple indicators of salt-tolerance were evaluated by cluster analysis and Analytic Hierarchy Process. The results were achieved and reported as following:1. The soil in Yellow River Delta is characterized with heavy clay, poor permeability and low content of organic matter & nutrients. The soil type is heavy loam and light clay in the experimental sites, total soil porosity is among 38% and 50%; the maximum of non-capillary porosity reaches 6%. Soil salt contents are from 2 g.kg-1 to 6 g.kg-1, and organic matter content is only 4.68 g.kg-1; alkali-hydrolyzable nitrogen, available phosphorus and potassium contents are 0.74mg.kg-1,13.14 mg.kg-1 and 168mg.kg-1 respectively.While soil salinity of surface soil can be changed under the base of the impact of soil salinity over time. Horizontal distribution of soil salinity is negatively correlated with soil moisture. The vertical distribution of soil salinity patterns is impacted by soil moisture change. It changes significantly when soil moisture falls to 5%.2. Three different treatments of alien soil (plus 10cm riversand,10cm rice bran,5cm riversand+5cm rice bran) are tested and the result shows that comparing with control group, the survival rates of Fraxinus velutina with alien soils are 135%、134% and 127%. For Robinia pseudoacacia, they are 190%、176% and 149% respectively. And for Platycladus orientalis, survival rates all are 181%. Moreover for plantlet height and basal diameter of F. velutina and P. orientalis,,they are also significantly higher than the ones in control. In terms of F. velutina, the result shows that the higher of soil salinity, the much more obvious effects to alien soil afforestation. And its survival rate, height and basal diameter reach to 200.6%、224.3%、196.0% compared with the value in control. For soil treatment, plus rice bran is better with other approaches. The best formulations of seed-base are various among specific species, i.e. peat content of 30% and 50% are better for F. velutina and P. orientalis, the peat content of 70% is the best for R. pseudoacacia. But there is little effect on the growth of Salix psammophila. 3 Salt content in afforestation sites plays a vital role to the test results. For example, in higher salt content lands the survival rates are significantly lower for F. velutina and P. orientalis. Plantation results in three different plots with light, moderate and heavy salt, the survival rates of F. velutina are 94.1%,83.3%,22.2%, and 88.9%、72.2%,11.1% for P. orientalis. Besides soil salt content, soil texture is also closely related with the survival of R. pseudoacacia, the survival rates are 33.3%,16.7% and 77.8% respectively. All the tested trees can grow well in the soils with light and moderate salt content, and the growth of trees are restricted significantly in soils with heavy salt.4. The physiological indicators including activities of SOD, POD and CAT, contents of chlorophyll, soluble sugar, soluble protein, praline and MDA, and cell membrane permeability of 16 tested species have been determined. The results indicate that the contents of chlorophyll, soluble sugar, and SOD activities are positively correlated and correlation coefficients are 0.662 and 0.657 respectively. The relationship between SOD activity and CAT is positive, and correlation coefficient is 0.412. While the relationship between POD activity and cell conductance is negative, and correlation coefficient is-0.431.5. Through the physiological indicators analysis and afforestation experiment, the following conclusions could be presented. The trees such as Broussonetia papyifera, Fraxinus velutina, Amorpha fruticosa, Salix psammophila Platycladus orientalis, Lycium chinense are with high salt tolerance under the test conditions. These trees can be chosen as pioneer species for afforstation in saline-alkali land in Yellow River Delta. And Hibiscus syriacus, Albizia julibrissin, Diospyros lotus, Lonicera japonica, Morus alba and Robinia pseudoacacia are the moderately recommended species, while Ulmus pumila, Ailanthus altissima, Amygdalus persica and Armeniaca sibirica are not recommended species for afforestation in the region.更多还原