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通过全部调查法对防护林工程的次年苗木保存率进行了详细调查,结果显示:(1)由于造林环境恶劣,塔里木沙漠公路防护林工程苗木保存率较低,约70%;(2)梭梭、柽柳、沙拐枣三种苗木的保存率不同,基本表现为梭梭和沙拐枣大于柽柳,而且在不同矿化度条件下也存在差异,矿化度较小时差异不大,而随着矿化度的增加差异增大;(3)三种苗木的保存率都随灌水矿化度的增加而逐渐降低,但矿化度小于10 g/L时,变化规律性不强;(4)公路沿线苗木保存率呈一定的空间分异规律,在防护林横断面不同部位、垄间不同沙丘密度、纵向复合沙垄区不同地貌部位和公路沿线不同大地貌单元之间,苗木保存率存在差异。研究结果对于极端干旱环境中造林和塔里木沙漠公路防护林可持续性研究具有借鉴意义。
The results showed that: (1) Due to the poor afforestation environment, the preservation rate of Tarim Desert Highway shelterbelt seedlings was relatively low, about 70%; (2) The control rates of Haloxylon ammodendron, Tamarix chinensis, Calligonum jujube seedlings of three kinds of conservation rates are different, the basic performance of Haloxylon ammodendron and Shaddock more than tamarisk, but also in different mineralization conditions there are differences, the smaller the degree of salinity when little, and with the mineralization (3) The preservation rates of three kinds of seedlings all decreased with the increase of irrigation salinity, but the variation regularity was not strong when the salinity was less than 10 g / L; (4) The seedling preservation rate showed a certain degree of spatial variability. There were differences in seedling preservation rates between different parts of the shelterbelts, different sand dune density in the ridge, different landforms in the longitudinal composite ditch area and different macroscopic units along the highway. The results of the study are of reference for afforestation in extreme arid environment and sustainability research of Tarim Desert Highway Shelterbelt.