| 腾格里沙漠东南缘白刺灌丛地土壤性状的特征 |
| |
| 引用本文： | 贾晓红,李新荣,陈应武.腾格里沙漠东南缘白刺灌丛地土壤性状的特征[J].干旱区地理,2007,30(4):57-564. |
| |
| 作者姓名： | 贾晓红 李新荣 陈应武 |
| |
| 作者单位： | 中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站,甘肃,兰州,730000 |
| |
| 基金项目： | 国家自然科学基金(40471006,40671011)，国家科技支撑计划项目(2006BAD26B02)，中国科学院寒区旱区环境与工程研究所创新项目(2004113)共同资助 |
| |
| 摘 要： | 腾格里沙漠东南缘白刺灌丛地土壤颗粒组成中仍以细沙粒(0.25～0.05 mm)含量占主要成分(80%～99%),除固定沙堆土0～5 cm土壤粉沙粒含量高于堆间低地外,沙堆土不同深度粉沙粒含量(0.05～0.002 mm)均低于堆间低地;沙堆不同部位的土壤含水量有一致的变化趋势且差异不大,沙堆0～60 cm土层含水量低于堆间低地,60 cm以下的土壤含水量不仅高于0～60 cm,并且高于堆间低地。发育于草甸盐土上的堆间低地20 cm以下水分含量变化基本保持在较高的水平,发育于盐化半固定风沙土上的堆间低地水分含量在20 cm以下呈急剧降低趋势。白刺沙堆上土壤剖面土壤水分含量的这种变化和堆间低地20 cm处较高的含水层,将会为灌丛植物在年内气候干旱期的生命维持提供着重要水源保证。土壤容重白刺沙堆大于堆间低地,土壤剖面堆间低地的容重基本无变异,而沙堆上因为植物发育土壤容重有不同程度的差异。表征土壤肥力和保肥能力的阳离子代换量均是堆间低地大于沙堆上。堆间低地和沙堆上土壤全氮、有机质、电导率含量和pH值差异因白刺沙堆发育的生境不同而不同,处于半固定沙地生境的白刺沙堆并未形成灌丛的"沃岛效应",处于固定沙地生境的白刺沙堆有弱"沃岛效应"。因此,白刺沙堆地表物质的固定是该植物种生长的生境产生"沃岛效应"的前提。
|
| 关 键 词： | 白刺沙堆 堆间低地 土壤性状 腾格里沙漠东南缘 |
| 收稿时间： | 2006-09-16 |
| 修稿时间： | 2007-01-23 |
Soil properties of Nitraria land in southeastern Tengger Desert |
| |
| JIA Xiao-hong,LI Xin-rong,CHEN Ying-wu.Soil properties of Nitraria land in southeastern Tengger Desert[J].Arid Land Geography,2007,30(4):57-564. |
| |
| Authors: | JIA Xiao-hong LI Xin-rong CHEN Ying-wu |
| |
| Institution: | Shapotou Desert Experimental Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China |
| |
| Abstract: | The results show that fine sand particle(0.25-0.05 mm in diameter) content accounts for main fraction in distribution of soil particle size fractions of Nitraria sand-pile at different habitats in the southeastern fringe of Tengger desert.Silt(0.05-0.002 mm) content of sand-pile is lower than that of the inter-pile lowland resulting from the parent material and sand matter of the Desert,but the results are adverse at sand-pile of soil crust habitat.The soil moisture content in different position of the sand-pile has the same variation tendency and no significant difference.Soil moisture content of the sand-pile at 0-60 cm in depth is lower than that of the inter-pile lowland;adversely,the moisture content at the depth >60 cm is higher than that of not only the 0-60 cm in depth but also the inter-pile lowland.Soil moisture content in different habitat has different tendency at the profile in interpile lowland.The moisture content of soil lower than 20 cm deep of inter-pile lowland with meadow salinized soil basically is at high level,while the moisture content of soil lower than 20 cm deep of inter-pile lowland with salinized and semi-fixed blown sands rapidly decreased.This situation of soil moisture of sand-pile of Nitraria and the richer moisture of soil 20 cm deep of inter-pile lowland are of important watersource guarantee for ensuring the bushplant alive in the drought period.Although soil bulk density at sand-pile is higher than that of the inter-pile lowland,soil bulk density at the profile has significant difference at sand-pile due to vegetation conditions,and no variation in inter-pile lowland.Cation exchange capacity(CEC) characterizing soil fertility and its conservation capability of sand-pile is lower than that of the iner-piles lowland.However,the CEC of all positions have significant differences at profile.The soil organic matter,total nitrogen,electricity conductivity content and pH value have significant difference at different habitat in sand-pile or inter-pile lowland.Sand-pile with the semi-fixing habitat does not appear as "fertile island" effect.Sand-pile with the fixing habitat appears as weak "fertile island" effect.Therefore,the fixing of surface material on the dune topsoil is the precondition for forming "fertile island" effect in arid desert region. |
| |
| Keywords: | sand-pile of Nitraria inter-pile lowland soil properties southeastern Tengger Desert |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
