论文部分内容阅读
通过对塔克拉玛干沙漠腹地不同潜水埋深、矿化度条件下特有灌木塔克拉玛干沙拐枣(Calligonum.taklimakanensis B.R.Pan et G.M.Shen)水分生理特性的研究.结果表明:(1)潜水埋深的变动对塔克拉玛干沙拐枣的水势(清晨、午后)和蒸腾速率的影响比较明显,二者均随潜水埋深的增大而降低,气孔导度的变化主要与外界环境温湿条件相关.渗透势(ψsat,ψtlp),相对含水量和相对渗透水含量(RWCtlp,ROWCtlp)也有随潜水埋深增大而减小的趋势;(2)潜水矿化度对植物水势的影响比较显著,对相对含水量影响不显著.高矿化度对植物生产力降低的影响比较显著;(3)塔克拉玛干沙拐枣通过高蒸腾降低同化枝的温度,保持较高的体内水分含量来适应沙漠腹地干旱、高热的气候条件.另外通过自身调节甚至牺牲生产力来适应沙漠腹地的潜水状况的变化.
The physiological and biochemical characteristics of Calligonum taqimahanensis BRPan et GMShen were studied under different depths and salinities of Taklamakan desert.The results showed that: (1) The effects of water potential (early morning and afternoon) and transpiration rate of A. jujuba were more obvious, both of them decreased with the increase of submerged depth, and the changes of stomatal conductance were mainly related to the temperature and humidity conditions of the external environment. The osmotic potential (ψsat, ψtlp), relative water content and relative water content (RWCtlp, ROWCtlp) also decreased with the increase of buried depth. (2) The effect of submarine salinity on plant water potential was significant, and the effect on relative water content was not significant (3) Taklimakanacha jujube reduced the temperature of assimilating branches by high transpiration and maintained a high body moisture content to adapt to the arid and high-temperature climatic conditions in the hinterland of desert .In addition, the effects of high salinity on plant productivity decreased significantly Adapt itself to changes in the diving situation in the desert hinterland through self-regulation and even sacrificing productivity.