Knowledge Resource Center for Ecological Environment in Arid Area
| 黄土丘陵区影响枣林地土壤水分因子及枣树液流测定方法分析研究 | |
| 其他题名 | Analysis and Research of the Factors that Influence the Soil Moisture of Jujube Forestland and Determination Methods of Jujube Sap Flow |
| 马建鹏 | |
| 出版年 | 2015 |
| 学位类型 | 硕士 |
| 导师 | 摆万奇 |
| 学位授予单位 | 中国科学院大学 |
| 中文摘要 | 为了深入掌握半干旱区山地枣林耗水规律，本文重点侧重研究与枣林耗水有关的影响枣林土壤水分的因子和枣树树干液流测定方法对测值的作用，主要从枣林年龄、土壤颗粒与土壤剖面水分相关性分析和树干方位、深度与TDP监测值计算生育期耗水量精度分析评价了这两项有关枣林耗水的关键指标，以期更精准地研究枣林耗水规律，为今后黄土丘陵区枣林建设和发展中的水分管理提供技术与理论支撑。得到主要结论如下： 1) 树龄是造成枣林地土壤干化的主导因子。不同树龄枣林地土壤水分存在显著差异，土壤水分受枣树耗水影响显著。5a和15a枣林的耗水深度分别为320cm和560cm。土壤颗粒是造成林地土壤固有水分含量的关键，在枣林根系层以下仍有土壤水分低值分布层，研究区枣林由于土壤颗粒形成的土壤水分低值层大约在660~830cm范围。 2) 5 a枣林地在根系吸水影响范围内出现了100 cm(土层深度为300~400 cm)深的中度干燥化土层，15 a枣林地在根系吸水影响范围内分别出现了100 cm深的重度干燥化土层(土层深度为400~500 cm)和300 cm深的中度干燥化土层(土层深度为200~500 cm)。 3）不同方位探针监测结果间存在差异，研究时间尺度不同，各方位监测结果间的差异显著性不同，差异显著性大小表现为时尺度>日尺度>月尺度。 4）不同深度探针监测结果间存在差异，随研究时间尺度的不同，不同深度探针监测结果间的差异显著性不同，差异显著性大小表现为时尺度>日尺度>月尺度。 5）在树干北侧和深度为20mm的TDP监测值计算生育期耗水量更准确。 |
| 英文摘要 | In order to master the water consumption pattern of mountainous jujube forestland in semi-arid region further, in this study, we lay particular emphasis on the factors which related to the jujube water consumption that would influence the soil moisture and the effect of jujube sap flow monitor methods to monitoring values. And for the precise research of jujube water consumption pattern, we mainly evaluated the two key indicators that related to jujube water consumption from the ages of jujube forestland, the correlation analysis of soil particle and soil moisture profile, the calculation of water consumption in growth period from TDP monitoring values of different directions and depths. This research would provide technical and theoretical support for the water management in the jujube forestland construction and development in the future. The main results showed as bellow: 1) The age of jujube tree is the dominant factor that lead to the soil desiccation in jujube forestland. There are significant differences among soil moisture of jujube forest at different ages and the soil moisture of jujube forestland were influenced significantly by the water consumption of jujube tree. The depth of water consumption of different jujube forest is 320cm of 5a jujube forest and 560cm of 15a jujube forest. The soil particle is the key of the inherent water content of jujube forestland, and there was still exist low soil moisture distribute layer under the jujube roots and the low soil moisture distribute layer due to the particle in jujube forestland was in the range of 660~830cm. 2) In 5a jujube forestland, the moderate desiccation layer appeared in the root water absorption range with the depth 100cm from 300~400cm. A moderate desiccation layer with the depth 300cm from 200~500cm and a severe desiccation layer with the depth 100cm from 400~500cm appeared in 15a jujube forestland. 3) The difference exited between monitored jujube sap flow velocity at different directions and with the variation of study time scale its significance of differences differed. At the hourly scale, when the jujube water consumption was small, there was significant differences or very significant differences between the results monitored at different directions, with the increase of jujube water consumption the sap flow velocity increased and there was no more significant differences between the monitored results at different directions. At the daily scale, the variation of jujube water consumption did some effects to the distribution of sap flow on different directions. At monthly scale, the differences appeared in the study at hourly and daily scales disappeared. 4) There were differences between monitored results at different depths and with the variation of time scale in study its significance of difference differed. At the hourly and daily scales, the significance of difference of monitored results at different depths was influenced by water consumption at different growth stages. With the period of duration going, the jujube water consumption increased and the distribution of sap flow along the radial direction moved from the xylem beside the cambium to the part near to the core. At monthly scale, the significance of differences of monitored results at different depths also disappeared. 5) The water consumption in growth stage calculated by the monitored value of TDP installed at the north and with the depth of 20mm was more accuracy. |
| 中文关键词 | 土壤水分 ; 垂直分布 ; 耗水深度 ; 干燥化 ; 不同方位 ; 不同深度 ; 径向分布 |
| 英文关键词 | soil moisture vertical distribution water consumption depth desiccation different directions different depths radial distribution |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 水土保持与荒漠化防治 |
| 来源机构 | 中国科学院水利部水土保持研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/287582 |
| 推荐引用方式 GB/T 7714 | 马建鹏. 黄土丘陵区影响枣林地土壤水分因子及枣树液流测定方法分析研究[D]. 中国科学院大学,2015. |
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