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为了辨认立地条件和积雪厚度对梭梭苗木成活的影响,于2009年4月,在新疆古尔班通古特沙漠南缘选取了沙丘阴坡、沙丘阳坡、丘间平地作为研究样地,在原有自然降雪的基础上,通过补水模拟不同年份的积雪厚度,进行了梭梭春季免灌造林研究,选择适宜实施梭梭免灌造林的立地环境和积雪条件。研究结果表明,不同立地条件之间梭梭免灌造林成活率差异显著,沙丘阴坡、丘间平地和沙丘阳坡梭梭免灌造林成活率分别为53.66%、14.42%和4.73%,这与3种立地条件的土壤水分状况吻合,说明水分是影响梭梭免灌造林的关键因子;在不同的立地条件下,积雪厚度对梭梭免灌造林成活率的影响程度不同,在年积雪厚度达到17cm时,沙丘阴坡梭梭免灌造林成活率能达到54.95%,而在丘间平地与沙丘阳坡梭梭免灌造林成活率却很小,由于3种立地条件各种环境因子的差异,造成了不同立地条件下同一积雪厚度对梭梭免灌造林成活率存在差异。
In order to identify the impact of site conditions and snow thickness on the survival of seedlings of Haloxylon ammodendron, in April 2009, selected dune shady slopes, dune sunny slopes and dune patches as research sites on the southern margin of the Gurbantunggut Desert in Xinjiang, Based on the original natural snowfall, the snow-capped soils of different years were simulated by water recharge, and the study of spring irrigating afforestation in Haloxylon ammodendron was carried out. The site environment and snow cover conditions for silviculture were optimized. The results showed that Haloxylon ammodendron forest survival rate was significantly different among different habitats, and the survival rates of Haloxylon ammodendron, inter-mound plots and dune alpine Haloxylon ammodendron afforestation were 53.66%, 14.42% and 4.73%, respectively The soil moisture conditions of the three site conditions are in agreement, indicating that water is the key factor affecting the Haloxylon ammodendron-free afforestation. Under different site conditions, the influence of snow thickness on the survival rate of Haloxylon ammodendron-free irrigation is different. When the thickness reaches 17cm, the survival rate of Haloxylon ammodendron-rich plantation can reach 54.95% while the survival rate of Haloxylon ammodendron-free plantation in the dune layer is very small. Because of the three kinds of site conditions of various environmental factors Difference, resulting in the same site under the same snow thickness of Haloxylon no-irrigation survival rate differences.